1,186 results on '"HALL, PATRICK"'
Search Results
2. References
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Hall, Patrick and Needham, Catherine
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- 2023
3. Index
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Hall, Patrick and Needham, Catherine
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- 2023
4. 7 The limits of social care reform
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Hall, Patrick and Needham, Catherine
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- 2023
5. 8 Conclusion: between care paradigms
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Hall, Patrick and Needham, Catherine
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- 2023
6. 6 Territorial policy communities: scale, style and scope
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Hall, Patrick and Needham, Catherine
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- 2023
7. 4 The mechanisms of social care reform
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Hall, Patrick and Needham, Catherine
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- 2023
8. 5 The outcomes of social care reform
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Hall, Patrick and Needham, Catherine
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- 2023
9. 3 What is in crisis? The context of care policy in the four nations
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Hall, Patrick and Needham, Catherine
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- 2023
10. 2 What is social care policy for?
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Hall, Patrick and Needham, Catherine
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- 2023
11. 1 Comparing adult social care systems in the UK
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Hall, Patrick and Needham, Catherine
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- 2023
12. About the authors
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Hall, Patrick and Needham, Catherine
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- 2023
13. Acknowledgements
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Hall, Patrick and Needham, Catherine
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- 2023
14. Series editors' preface
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Hall, Patrick and Needham, Catherine
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- 2023
15. Table of Contents
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Hall, Patrick and Needham, Catherine
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- 2023
16. Front Cover
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Hall, Patrick and Needham, Catherine
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- 2023
17. Title page, Copyright page
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Hall, Patrick and Needham, Catherine
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- 2023
18. Understanding the Broad-line Region of Active Galactic Nuclei with Photoionization. I. the Moderate-Accretion Regime
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Wu, Qiaoya, Shen, Yue, Guo, Hengxiao, Anderson, Scott F., Brandt, W. N., Grier, Catherine J., Hall, Patrick B., Ho, Luis C., Homayouni, Yasaman, Horne, Keith, Li, Jennifer I-Hsiu, and Schneider, Donald P.
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Astrophysics - Astrophysics of Galaxies - Abstract
Over three decades of reverberation mapping (RM) studies on local broad-line active galactic nuclei (AGNs) have measured reliable black-hole (BH) masses for $> 100$ AGNs. These RM measurements reveal a significant correlation between the Balmer broad-line region size and the AGN optical luminosity (the $R-L$ relation). Recent RM studies for AGN samples with more diverse BH accretion parameters (e.g., mass and Eddington ratio) reveal a substantial intrinsic dispersion around the average $R-L$ relation, suggesting variations in the overall spectral energy distribution shape as functions of accretion parameters. Here we perform a detailed photoionization investigation of expected broad-line properties as functions of accretion parameters, using the latest models for the AGN continuum implemented in {\tt qsosed}. We compare theoretical predictions with observations of a sample of 67 $z\lesssim0.5$ reverberation-mapped AGNs with both rest-frame optical and UV spectra in the moderate-accretion regime (Eddington ratio $\lambda_{\rm Edd}\equiv L/L_{\rm Edd}<0.5$). The UV/optical line strengths and their dependences on accretion parameters can be reasonably well reproduced by the locally-optimally-emitting cloud (LOC) photoionization models. We provide quantitative recipes that use optical/UV line flux ratios to infer the ionizing continuum, which is not directly observable. In addition, photoionization models with universal values of ionization parameter ($\log U_{\rm H}=-2$) and hydrogen density ($\log n({\rm H})=12$) can qualitatively reproduce the observed global $R-L$ relation for the current AGN sample. However, such models fail to reproduce the observed trend of decreasing BLR size with $L/L_{\rm Edd}$ at fixed optical luminosity, which may imply that the gas density increases with the accretion rate., Comment: 23 pages, 15 figures. Submitted to ApJ. Comments welcome!
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- 2024
19. AGN STORM 2: IX. Studying the Dynamics of the Ionized Obscurer in Mrk 817 with High-resolution X-ray Spectroscopy
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Zaidouni, Fatima, Kara, Erin, Kosec, Peter, Mehdipour, Missagh, Rogantini, Daniele, Kriss, Gerard A., Behar, Ehud, Kaastra, Jelle, Barth, Aaron J., Cackett, Edward M., De Rosa, Gisella, Homayouni, Yasaman, Horne, Keith, Landt, Hermine, Arav, Nahum, Bentz, Misty C., Brotherton, Michael S., Bontà, Elena Dalla, Dehghanian, Maryam, Ferland, Gary J., Fian, Carina, Gelbord, Jonathan, Goad, Michael R., Buitrago, Diego H. González, Grier, Catherine J., Hall, Patrick B., Hu, Chen, Ilić, Dragana, Kaspi, Shai, Kochanek, Christopher S., Kovačević, Andjelka B., Kynoch, Daniel, Lewin, Collin, Montano, John, Netzer, Hagai, Neustadt, Jack M. M., Panagiotou, Christos, Partington, Ethan R., Plesha, Rachel, Popović, Luka Č., Proga, Daniel, Storchi-Bergmann, Thaisa, Sanmartim, David, Siebert, Matthew R., Signorini, Matilde, Vestergaard, Marianne, Waters, Tim, and Zu, Ying
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Astrophysics - High Energy Astrophysical Phenomena - Abstract
We present the results of the XMM-Newton and NuSTAR observations taken as part of the ongoing, intensive multi-wavelength monitoring program of the Seyfert 1 galaxy Mrk 817 by the AGN Space Telescope and Optical Reverberation Mapping 2 (AGN STORM 2) Project. The campaign revealed an unexpected and transient obscuring outflow, never before seen in this source. Of our four XMM-Newton/NuSTAR epochs, one fortuitously taken during a bright X-ray state has strong narrow absorption lines in the high-resolution grating spectra. From these absorption features, we determine that the obscurer is in fact a multi-phase ionized wind with an outflow velocity of $\sim$5200 km s$^{-1}$, and for the first time find evidence for a lower ionization component with the same velocity observed in absorption features in the contemporaneous HST spectra. This indicates that the UV absorption troughs may be due to dense clumps embedded in diffuse, higher ionization gas responsible for the X-ray absorption lines of the same velocity. We observe variability in the shape of the absorption lines on timescales of hours, placing the variable component at roughly 1000 $R_g$ if attributed to transverse motion along the line of sight. This estimate aligns with independent UV measurements of the distance to the obscurer suggesting an accretion disk wind at the inner broad line region. We estimate that it takes roughly 200 days for the outflow to travel from the disk to our line of sight, consistent with the timescale of the outflow's column density variations throughout the campaign.
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- 2024
20. The SDSS-V Black Hole Mapper Reverberation Mapping Project: CIV BAL Acceleration in the Quasar SBS 1408+544
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Wheatley, Robert, Grier, Catherine J., Hall, Patrick B., Brandt, W. N., Lotz, Jonah, Schneider, D. P., Trump, Jonathan R., Shen, Yue, Seaton, Lucas M., Anderson, Scott F., Temple, Matthew J., Assef, Roberto, Fries, Logan B., Homayouni, Y., Kakkad, Darshan, Koekemoer, Anton M., Martınez-Aldama, Mary Loli, Negrete, C. Alenka, Ricci, Claudio, Bizyaev, Dmitry, Brownstein, Joel R., Morrison, Sean, and Pan, Kaike
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Astrophysics - Astrophysics of Galaxies - Abstract
We present the results of an investigation of a highly variable CIV broad absorption-line feature in the quasar SBS 1408+544 (z=2.337) that shows a significant shift in velocity over time. This source was observed as a part of the Sloan Digital Sky Survey Reverberation Mapping Project and the SDSS-V Black Hole Mapper Reverberation Mapping Project, and has been included in two previous studies, both of which identified significant variability in a high-velocity CIV broad absorption line (BAL) on timescales of just a few days in the quasar rest frame. Using ~130 spectra acquired over eight years of spectroscopic monitoring with SDSS, we have determined that this BAL is not only varying in strength, but is also systematically shifting to higher velocities. Using cross-correlation methods, we measure the velocity shifts (and corresponding acceleration) of the BAL on a wide range of timescales, measuring an overall velocity shift of delta v = -683 (+89, -84) km s-1 over the 8-year monitoring period. This corresponds to an average rest-frame acceleration of a=1.04 (+0.14, -0.13) cm s-2, though the magnitude of the acceleration on shorter timescales is not constant throughout. We place our measurements in the context of BAL-acceleration models and examine various possible causes of the observed velocity shift., Comment: Published in the Astrophysical Journal
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- 2024
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21. Quasar Outflow Deceleration or Acceleration: Predictions and a Search
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Hall, Patrick B., Weiss, E., Brandt, W. N., and Mulholland, C. J.
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Astrophysics - Astrophysics of Galaxies - Abstract
Quasar winds can shock and sweep up ambient interstellar medium (ISM) gas, contributing to galactic quenching. We combine and extend past models of energy-conserving shock bubbles around quasars, investigate model implications from an observational standpoint, and test model predictions using new high-resolution spectroscopic observations of the broad absorption line quasar SDSS J030000.56+004828.0 (J0300). Even with constant energy input from the wind, a bubble's expansion decelerates over time as more ISM gas is swept up. Our new observations enable a direct search for this deceleration. We obtain the tightest reported 3-sigma limit on the average rest-frame deceleration (or acceleration) of a quasar outflow: |a|$<$0.1 km s$^{-1}$ yr$^{-1}$ ($<3 \times 10^{-4}$ cm s$^{-2}$) in the relatively low-velocity Ca II outflow of J0300 over 9.65 rest-frame years. We can satisfy these limits with certain parameter choices in our model, but the large velocity range of the Ca II absorption in J0300 rules out the hypothesis that such gas shares the velocity of the swept-up ISM gas in a self-similar shock bubble. We investigate the possibility of ram-pressure acceleration of preexisting ISM clouds and conclude that the velocity range seen in Ca II in J0300 is potentially consistent with such an explanation. The Ca II-absorbing gas clouds in J0300 have been inferred to have high densities by Choi et al., in which case they can only have been accelerated to their current speeds if they were originally at least an order of magnitude less dense than they are today., Comment: MNRAS, in press
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- 2024
22. High-quality Extragalactic Legacy-field Monitoring (HELM) with DECam
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Zhuang, Ming-Yang, Yang, Qian, Shen, Yue, Adamow, Monika, Friedel, Douglas N., Gruendl, R. A., Liu, Xin, Martini, Paul, Abbott, Timothy M. C., Anderson, Scott F., Assef, Roberto J., Bauer, Franz E., Bielby, Rich, Brandt, W. N., Burke, Colin J., Casares, Jorge, Chen, Yu-Ching, De Rosa, Gisella, Drlica-Wagner, Alex, Dwelly, Tom, Eltvedt, Alice, Alvarez, Gloria Fonseca, Fu, Jianyang, Fuentes, Cesar, Graham, Melissa L., Grier, Catherine J., Golovich, Nathan, Hall, Patrick B., Hartigan, Patrick, Horne, Keith, Koekemoer, Anton M., Krumpe, Mirko, Li, Jennifer I., Lidman, Chris, Malik, Umang, Mangian, Amelia, Merloni, Andrea, Ricci, Claudio, Salvato, Mara, Sharp, Rob, Stone, Zachary, Trilling, David E., Tucker, Brad E., Wen, Di, Wideman, Zachary, Xue, Yongquan, Yu, Zhefu, and Zucker, Catherine
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Astrophysics - Astrophysics of Galaxies - Abstract
High-quality Extragalactic Legacy-field Monitoring (HELM) is a long-term observing program that photometrically monitors several well-studied extragalactic legacy fields with the Dark Energy Camera (DECam) imager on the CTIO 4m Blanco telescope. Since Feb 2019, HELM has been monitoring regions within COSMOS, XMM-LSS, CDF-S, S-CVZ, ELAIS-S1, and SDSS Stripe 82 with few-day cadences in the $(u)gri(z)$ bands, over a collective sky area of $\sim 38$ deg${\rm ^2}$. The main science goal of HELM is to provide high-quality optical light curves for a large sample of active galactic nuclei (AGNs), and to build decades-long time baselines when combining past and future optical light curves in these legacy fields. These optical images and light curves will facilitate the measurements of AGN reverberation mapping lags, as well as studies of AGN variability and its dependences on accretion properties. In addition, the time-resolved and coadded DECam photometry will enable a broad range of science applications from galaxy evolution to time-domain science. We describe the design and implementation of the program and present the first data release that includes source catalogs and the first $\sim 3.5$ years of light curves during 2019A--2022A., Comment: 11 pages, 8 figures, 4 tables, submitted to ApJS. Median source catalogs and light curves of individual objects are publicly available at https://ariel.astro.illinois.edu/helm/
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- 2024
23. Social Care in the UK’s Four Nations
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Needham, Catherine and Hall, Patrick
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Ageing ,Care regimes ,Comparative care ,Devolution ,Social care ,thema EDItEUR::J Society and Social Sciences::JK Social services and welfare, criminology::JKS Social welfare and social services ,thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPR Regional, state and other local government ,thema EDItEUR::M Medicine and Nursing::MB Medicine: general issues::MBP Health systems and services - Abstract
Chapter 4 and chapter 7 are available Open Access under CC-BY-NC-ND licence. Two decades have passed since the devolution of social care policy, with key differences emerging between the UK’s four systems, but what impact have these differences had? This book presents for the first time research on the perspectives of social care policy makers on the four systems in which they operate and the ways in which they borrow from one another. Drawing on extensive interviews with national and local policy makers across the UK, the book raises vital questions about the role of ‘standardisation’ and ‘differentiation’ in social care, concluding that when given equal capacity to reform their respective systems, the regimes in each nation may take radically different shapes.
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- 2023
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24. Chapter 4 The mechanisms of social care reform
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Needham, Catherine and Hall, Patrick
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Ageing ,Care regimes ,Comparative care ,Devolution ,Social care ,thema EDItEUR::J Society and Social Sciences::JK Social services and welfare, criminology::JKS Social welfare and social services ,thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPR Regional, state and other local government ,thema EDItEUR::M Medicine and Nursing::MB Medicine: general issues::MBP Health systems and services - Abstract
Chapter 4 and chapter 7 are available Open Access under CC-BY-NC-ND licence. Two decades have passed since the devolution of social care policy, with key differences emerging between the UK’s four systems, but what impact have these differences had? This book presents for the first time research on the perspectives of social care policy makers on the four systems in which they operate and the ways in which they borrow from one another. Drawing on extensive interviews with national and local policy makers across the UK, the book raises vital questions about the role of ‘standardisation’ and ‘differentiation’ in social care, concluding that when given equal capacity to reform their respective systems, the regimes in each nation may take radically different shapes.
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- 2023
- Full Text
- View/download PDF
25. Chapter 7 The limits of social care reform
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Needham, Catherine and Hall, Patrick
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Ageing ,Care regimes ,Comparative care ,Devolution ,Social care ,thema EDItEUR::J Society and Social Sciences::JK Social services and welfare, criminology::JKS Social welfare and social services ,thema EDItEUR::J Society and Social Sciences::JP Politics and government::JPR Regional, state and other local government ,thema EDItEUR::M Medicine and Nursing::MB Medicine: general issues::MBP Health systems and services - Abstract
Chapter 4 and chapter 7 are available Open Access under CC-BY-NC-ND licence. Two decades have passed since the devolution of social care policy, with key differences emerging between the UK’s four systems, but what impact have these differences had? This book presents for the first time research on the perspectives of social care policy makers on the four systems in which they operate and the ways in which they borrow from one another. Drawing on extensive interviews with national and local policy makers across the UK, the book raises vital questions about the role of ‘standardisation’ and ‘differentiation’ in social care, concluding that when given equal capacity to reform their respective systems, the regimes in each nation may take radically different shapes.
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- 2023
- Full Text
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26. AGN STORM 2. VI. Mapping Temperature Fluctuations in the Accretion Disk of Mrk 817
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Neustadt, Jack M. M., Kochanek, Christopher S., Montano, John, Gelbord, Jonathan, Barth, Aaron J., De Rosa, Gisella, Kriss, Gerard A., Cackett, Edward M., Horne, Keith, Kara, Erin A., Landt, Hermine, Netzer, Hagai, Arav, Nahum, Bentz, Misty C., Bonta, Elena Dalla, Dehghanian, Maryam, Du, Pu, Edelson, Rick, Ferland, Gary J., Fian, Carina, Fischer, Travis, Goad, Michael R., Buitrago, Diego H. Gonzalez, Gorjian, Varoujan, Grier, Catherine J., Hall, Patrick B., Homayouni, Y., Hu, Chen, Ilic, Dragana, Joner, Michael D., Kaastra, Jelle, Kaspi, Shai, Korista, Kirk T., Kovacevic, Andjelka B., Lewin, Collin, Li, Yan-Rong, McHardy, Ian M., Mehdipour, Missagh, Miller, Jake A., Panagiotou, Christos, Partington, Ethan, Plesha, Rachel, Pogge, Richard W., Popovic, Luka C., Proga, Daniel, Storchi-Bergmann, Thaisa, Sanmartim, David, Siebert, Matthew R., Signorini, Matilde, Vestergaard, Marianne, Zaidouni, Fatima, and Zu, Ying
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Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Astrophysics of Galaxies - Abstract
We fit the UV/optical lightcurves of the Seyfert 1 galaxy Mrk 817 to produce maps of the accretion disk temperature fluctuations $\delta T$ resolved in time and radius. The $\delta T$ maps are dominated by coherent radial structures that move slowly ($v \ll c$) inwards and outwards, which conflicts with the idea that disk variability is driven only by reverberation. Instead, these slow-moving temperature fluctuations are likely due to variability intrinsic to the disk. We test how modifying the input lightcurves by smoothing and subtracting them changes the resulting $\delta T$ maps and find that most of the temperature fluctuations exist over relatively long timescales ($\sim$100s of days). We show how detrending AGN lightcurves can be used to separate the flux variations driven by the slow-moving temperature fluctuations from those driven by reverberation. We also simulate contamination of the continuum emission from the disk by continuum emission from the broad line region (BLR), which is expected to have spectral features localized in wavelength, such as the Balmer break contaminating the $U$ band. We find that a disk with a smooth temperature profile cannot produce a signal localized in wavelength and that any BLR contamination should appear as residuals in our model lightcurves. Given the observed residuals, we estimate that only $\sim$20% of the variable flux in the $U$ and $u$ lightcurves can be due to BLR contamination. Finally, we discus how these maps not only describe the data, but can make predictions about other aspects of AGN variability., Comment: 23 pages, 18 figures, submitting to ApJ, comments welcome
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- 2023
27. The Sloan Digital Sky Survey Reverberation Mapping Project: Investigation of Continuum Lag Dependence on Broad-Line Contamination and Quasar Properties
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Sharp, Hugh W., Homayouni, Y., Trump, Jonathan R., Anderson, Scott F., Assef, Roberto J., Brandt, W. N., Davis, Megan C., Fries, Logan B., Grier, Catherine J., Hall, Patrick B., Horne, Keith, Koekemoer, Anton M., Martínez-Aldama, Mary Loli, Menezes, David M., Pena, Theodore, Ricci, C., Schneider, Donald P., Shen, Yue, and Trakhtenbrot, Benny
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Astrophysics - Astrophysics of Galaxies - Abstract
This work studies the relationship between accretion-disk size and quasar properties, using a sample of 95 quasars from the SDSS-RM project with measured lags between the $g$ and $i$ photometric bands. Our sample includes disk lags that are both longer and shorter than predicted by the \citet{SS73} model, requiring explanations which satisfy both cases. Although our quasars each have one lag measurement, we explore the wavelength-dependent effects of diffuse broad line region (BLR) contamination through our sample's broad redshift range, $0.1
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- 2023
28. AGN STORM 2: V. Anomalous Behavior of the CIV Light Curve in Mrk 817
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Homayouni, Y., Kriss, Gerard A., De Rosa, Gisella, Plesha, Rachel, Cackett, Edward M., Goad, Michael R., Korista, Kirk T., Horne, Keith, Fischer, Travis, Waters, Tim, Barth, Aaron J., Kara, Erin A., Landt, Hermine, Arav, Nahum, Boizelle, Benjamin D., Bentz, Misty C., Brotherton, Michael S., Chelouche, Doron, Bonta, Elena Dalla, Dehghanian, Maryam, Du, Pu, Ferland, Gary J., Fian, Carina, Gelbord, Jonathan, Grier, Catherine J., Hall, Patrick B., Hu, Chen, Ilic, Dragana, Joner, Michael D., Kaastra, Jelle, Kaspi, Shai, Kovacevic, Andjelka B., Kynoch, Daniel, Li, Yan-Rong, Mehdipour, Missagh, Miller, Jake A., Mitchell, Jake, Montano, John, Netzer, Hagai, Neustadt, J. M. M., Partington, Ethan, Popovic, Luka C., Proga, Daniel, Storchi-Bergmann, Thaisa, Sanmartim, David, Siebert, Matthew R., Treu, Tommaso, Vestergaard, Marianne, Wang, Jian-Min, Ward, Martin J., Zaidouni, Fatima, and Zu, Ying
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Astrophysics - Astrophysics of Galaxies - Abstract
An intensive reverberation mapping campaign on the Seyfert 1 galaxy Mrk817 using the Cosmic Origins Spectrograph (COS) on the Hubble Space Telescope (HST) revealed significant variations in the response of the broad UV emission lines to fluctuations in the continuum emission. The response of the prominent UV emission lines changes over a $\sim$60-day duration, resulting in distinctly different time lags in the various segments of the light curve over the 14 months observing campaign. One-dimensional echo-mapping models fit these variations if a slowly varying background is included for each emission line. These variations are more evident in the CIV light curve, which is the line least affected by intrinsic absorption in Mrk817 and least blended with neighboring emission lines. We identify five temporal windows with distinct emission line response, and measure their corresponding time delays, which range from 2 to 13 days. These temporal windows are plausibly linked to changes in the UV and X-ray obscuration occurring during these same intervals. The shortest time lags occur during periods with diminishing obscuration, whereas the longest lags occur during periods with rising obscuration. We propose that the obscuring outflow shields the ultraviolet broad lines from the ionizing continuum. The resulting change in the spectral energy distribution of the ionizing continuum, as seen by clouds at a range of distances from the nucleus, is responsible for the changes in the line response., Comment: 20 pages, 8 figures, Accepted for publication in ApJ
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- 2023
29. AGN STORM 2. IV. Swift X-ray and ultraviolet/optical monitoring of Mrk 817
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Cackett, Edward M., Gelbord, Jonathan, Barth, Aaron J., De Rosa, Gisella, Edelson, Rick, Goad, Michael R., Homayouni, Yasaman, Horne, Keith, Kara, Erin A., Kriss, Gerard A., Korista, Kirk T., Landt, Hermine, Plesha, Rachel, Arav, Nahum, Bentz, Misty C., Boizelle, Benjamin D., Bonta, Elena Dalla, Dehghanian, Maryam, Donnan, Fergus, Du, Pu, Ferland, Gary J., Fian, Carina, Filippenko, Alexei V., Buitrago, Diego H. Gonzalez, Grier, Catherine J., Hall, Patrick B., Hu, Chen, Ilic, Dragana, Kaastra, Jelle, Kaspi, Shai, Kochanek, Christopher S., Kovacevic, Andjelka B., Kynoch, Daniel, Li, Yan-Rong, McLane, Jacob N., Mehdipour, Missagh, Miller, Jake A., Montano, John, Netzer, Hagai, Panagiotou, Christos, Partington, Ethan, Popovic, Luka C., Proga, Daniel, Rogantini, Daniele, Sanmartim, David, Siebert, Matthew R., Storchi-Bergmann, Thaisa, Vestergaard, Marianne, Wang, Jian-Min, Waters, Tim, and Zaidouni, Fatima
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Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Astrophysics of Galaxies - Abstract
The AGN STORM 2 campaign is a large, multiwavelength reverberation mapping project designed to trace out the structure of Mrk 817 from the inner accretion disk to the broad emission line region and out to the dusty torus. As part of this campaign, Swift performed daily monitoring of Mrk 817 for approximately 15 months, obtaining observations in X-rays and six UV/optical filters. The X-ray monitoring shows that Mrk 817 was in a significantly fainter state than in previous observations, with only a brief flare where it reached prior flux levels. The X-ray spectrum is heavily obscured. The UV/optical light curves show significant variability throughout the campaign and are well correlated with one another, but uncorrelated with the X-rays. Combining the Swift UV/optical light curves with Hubble UV continuum light curves, we measure interband continuum lags, $\tau(\lambda)$, that increase with increasing wavelength roughly following $\tau(\lambda) \propto \lambda^{4/3}$, the dependence expected for a geometrically thin, optically thick, centrally illuminated disk. Modeling of the light curves reveals a period at the beginning of the campaign where the response of the continuum is suppressed compared to later in the light curve - the light curves are not simple shifted and scaled versions of each other. The interval of suppressed response corresponds to a period of high UV line and X-ray absorption, and reduced emission line variability amplitudes. We suggest that this indicates a significant contribution to the continuum from the broad line region gas that sees an absorbed ionizing continuum., Comment: 20 pages, 13 figures, 3 tables, accepted for publication in ApJ
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- 2023
30. The Sloan Digital Sky Survey Reverberation Mapping Project: Key Results
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Shen, Yue, Grier, Catherine J., Horne, Keith, Stone, Zachary, Li, Jennifer I., Yang, Qian, Homayouni, Yasaman, Trump, Jonathan R., Anderson, Scott F., Brandt, W. N., Hall, Patrick B., Ho, Luis C., Jiang, Linhua, Petitjean, Patrick, Schneider, Donald P., Tao, Charling, Donnan, Fergus. R., AlSayyad, Yusra, Bershady, Matthew A., Blanton, Michael R., Bizyaev, Dmitry, Bundy, Kevin, Chen, Yuguang, Davis, Megan C., Dawson, Kyle, Fan, Xiaohui, Greene, Jenny E., Groller, Hannes, Guo, Yucheng, Ibarra-Medel, Hector, Jiang, Yuanzhe, Keenan, Ryan P., Kollmeier, Juna A., Lejoly, Cassandra, Li, Zefeng, de la Macorra, Axel, Moe, Maxwell, Nie, Jundan, Rossi, Graziano, Smith, Paul S., Tee, Wei Leong, Weijmans, Anne-Marie, Xu, Jiachuan, Yue, Minghao, Zhou, Xu, Zhou, Zhimin, and Zou, Hu
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We present the final data from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project, a precursor to the SDSS-V Black Hole Mapper Reverberation Mapping program. This data set includes 11-year photometric and 7-year spectroscopic light curves for 849 broad-line quasars over a redshift range of 0.1
=0.62+-0.07 for the line dispersion measured from the RMS spectrum. The intrinsic scatter of individual virial factors is 0.31+-0.07 dex, indicating a factor of two systematic uncertainty in RM black hole masses. Our lag measurements reveal significant R-L relations for Hbeta and MgII at high redshift, consistent with the latest measurements based on heterogeneous samples. While we are unable to robustly constrain the slope of the R-L relation for CIV given the limited dynamical range in luminosity, we found substantially larger scatter in CIV lags at fixed L1350. Using the SDSS-RM lag sample, we derive improved single-epoch (SE) mass recipes for Hbeta, MgII and CIV, which are consistent with their respective RM masses as well as between the SE recipes from two different lines, over the luminosity range probed by our sample. The new Hbeta and MgII recipes are approximately unbiased estimators at given RM masses, but there are systematic biases in the CIV recipe. The intrinsic scatter of SE masses around RM masses is ~0.45 dex for Hbeta and MgII, increasing to ~0.58 dex for CIV., Comment: Replaced with accepted version (ApJS in press). All measurements remain unchanged from the previous version. 38 pages. Data products available at https://ariel.astro.illinois.edu/sdssrm/final result/ and ftp://quasar.astro.illinois.edu/public/sdssrm/final_result/ - Published
- 2023
31. The State of the Streets: Measurements of Connectivity in the Atlas of Urban Expansion
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Lamson-Hall, Patrick, Angel, Shlomo, van der Meer, Freek D., Series Editor, Kuffer, Monika, editor, and Georganos, Stefanos, editor
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- 2024
- Full Text
- View/download PDF
32. Revisiting Emission-Line Measurement Methods for Narrow-Line Active Galactic Nuclei
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Khatu, Viraja C., Gallagher, Sarah C., Horne, Keith, Cackett, Edward M., Hu, Chen, Du, Pu, Wang, Jian-Min, Bian, Wei-Hao, Bai, Jin-Ming, Chen, Yong-Jie, Hall, Patrick, Jiang, Bo-Wei, Li, Sha-Sha, Li, Yan-Rong, Pasquini, Sofia, Songsheng, Yu-Yang, Wang, Chan, Xiao, Ming, and Yu, Zhe
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Measuring broad emission-line widths in active galactic nuclei (AGN) is not straightforward owing to the complex nature of flux variability in these systems. Line-width measurements become especially challenging when signal-to-noise is low, profiles are narrower, or spectral resolution is low. We conducted an extensive correlation analysis between emission-line measurements from the optical spectra of Markarian 142 (Mrk 142; a narrow-line Seyfert galaxy) taken with the Gemini North Telescope (Gemini) at a spectral resolution of 185.6+\-10.2 km/s and the Lijiang Telescope (LJT) at 695.2+\-3.9 km/s to investigate the disparities in the measured broad-line widths from both telescope data. Mrk~142 posed a challenge due to its narrow broad-line profiles, which were severely affected by instrumental broadening in the lower-resolution LJT spectra. We discovered that allowing the narrow-line flux of permitted lines having broad and narrow components to vary during spectral fitting caused a leak in the narrow-line flux to the broad component, resulting in broader broad-line widths in the LJT spectra. Fixing the narrow-line flux ratios constrained the flux leak and yielded the Hydrogen-beta broad-line widths from LJT spectra $\sim$54\% closer to the Gemini Hydrogen-beta widths than with flexible narrow-line ratios. The availability of spectra at different resolutions presented this unique opportunity to inspect how spectral resolution affected emission-line profiles in our data and adopt a unique method to accurately measure broad-line widths. Reconsidering line-measurement methods while studying diverse AGN populations is critical for the success of future reverberation-mapping studies. Based on the technique used in this work, we offer recommendations for measuring line widths in narrow-line AGN., Comment: 14 pages, 9 figures, accepted for publication in PASP
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- 2023
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33. AGN STORM 2. III. A NICER view of the variable X-ray obscurer in Mrk 817
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Partington, Ethan R., Cackett, Edward M., Kara, Erin, Kriss, Gerard A., Barth, Aaron J., De Rosa, Gisella, Homayouni, Y., Horne, Keith, Landt, Hermine, Zoghbi, Abderahmen, Edelson, Rick, Arav, Nahum, Boizelle, Benjamin D., Bentz, Misty C., Brotherton, Michael S., Byun, Doyee, Bonta, Elena Dalla, Dehghanian, Maryam, Du, Pu, Fian, Carina, Filippenko, Alexei V., Gelbord, Jonathan, Goad, Michael R., Buitrago, Diego H. Gonzalez, Grier, Catherine J., Hall, Patrick B., Hu, Chen, Ilic, Dragana, Joner, Michael D., Kochanek, Shai Kaspi Christopher S., Korista, Kirk T., Kovacevic, Andjelka B., Kynoch, Daniel, McLane, Jacob N., Mehdipour, Missagh, Panagiotou, Jake A. Miller Christos, Plesha, Rachel, Popovic, Luka C., Proga, Daniel, Rogantini, Daniele, Storchi-Bergmann, Thaisa, Sanmartim, David, Siebert, Matthew R., Vestergaard, Marianne, Ward, Martin J., Waters, Tim, and Zaidouni, Fatima
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Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Astrophysics of Galaxies - Abstract
The AGN STORM 2 collaboration targeted the Seyfert 1 galaxy Mrk 817 for a year-long multiwavelength, coordinated reverberation mapping campaign including HST, Swift, XMM-Newton, NICER, and ground-based observatories. Early observations with NICER and XMM revealed an X-ray state ten times fainter than historical observations, consistent with the presence of a new dust-free, ionized obscurer. The following analysis of NICER spectra attributes variability in the observed X-ray flux to changes in both the column density of the obscurer by at least one order of magnitude ($N_\mathrm{H}$ ranges from $2.85\substack{+0.48\\ -0.33} \times 10^{22}\text{ cm}^{-2}$ to $25.6\substack{+3.0\\ -3.5} \times 10^{22} \text{ cm}^{-2}$) and the intrinsic continuum brightness (the unobscured flux ranges from $10^{-11.8}$ to $10^{-10.5}$ erg s$^{-1}$ cm$^{-2}$ ). While the X-ray flux generally remains in a faint state, there is one large flare during which Mrk 817 returns to its historical mean flux. The obscuring gas is still present at lower column density during the flare but it also becomes highly ionized, increasing its transparency. Correlation between the column density of the X-ray obscurer and the strength of UV broad absorption lines suggests that the X-ray and UV continua are both affected by the same obscuration, consistent with a clumpy disk wind launched from the inner broad line region., Comment: 19 pages, 9 figures, Accepted to ApJ
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- 2023
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34. AGN STORM 2: II. Ultraviolet Observations of Mrk817 with the Cosmic Origins Spectrograph on the Hubble Space Telescope
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Homayouni, Y., De Rosa, Gisella, Plesha, Rachel, Kriss, Gerard A., Barth, Aaron J., Cackett, Edward M., Horne, Keith, Kara, Erin A., Landt, Hermine, Arav, Nahum, Boizelle, Benjamin D., Bentz, Misty C., Brink, Thomas G., Brotherton, Michael S., Chelouche, Doron, Bonta, Elena Dalla, Dehghanian, Maryam, Du, Pu, Ferland, Gary J., Ferrarese, Laura, Fian, Carina, Filippenko, Alexei V., Fischer, Travis, Foley, Ryan J., Gelbord, Jonathan, Goad, Michael R., Buitrago, Diego H. Gonzalez, Gorjian, Varoujan, Grier, Catherine J., Hall, Patrick B., Santisteban, Juan V. Hernandez, Hu, Chen, Ilic, Dragana, Joner, Michael D., Kaastra, Jelle, Kaspi, Shai, Kochanek, Christopher S., Korista, Kirk T., Kovacevic, Andjelka B., Kynoch, Daniel, Li, Yan-Rong, McHardy, Ian M., McLane, Jacob N., Mehdipour, Missagh, Miller, Jake A., Mitchell, Jake, Montano, John, Netzer, Hagai, Panagiotou, Christos, Partington, Ethan, Pogge, Richard W., Popovic, Luka C., Proga, Daniel, Rogantini, Daniele, Storchi-Bergmann, Thaisa, Sanmartim, David, Siebert, Matthew R., Treu, Tommaso, Vestergaard, Marianne, Wang, Jian-Min, Ward, Martin J., Waters, Tim, Williams, Peter R., Zaidouni, Fatima, and Zu, Ying
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Astrophysics - Astrophysics of Galaxies - Abstract
We present reverberation mapping measurements for the prominent ultraviolet broad emission lines of the active galactic nucleus Mrk817 using 165 spectra obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope. Our ultraviolet observations are accompanied by X-ray, optical, and near-infrared observations as part of the AGN Space Telescope and Optical Reverberation Mapping Program 2 (AGN STORM 2). Using the cross-correlation lag analysis method, we find significant correlated variations in the continuum and emission-line light curves. We measure rest-frame delayed responses between the far-ultraviolet continuum at 1180 A and Ly$\alpha$ $\lambda1215$ A ($10.4_{-1.4}^{+1.6}$ days), N V $\lambda1240$ A ($15.5_{-4.8}^{+1.0}$days), SiIV + OIV] $\lambda1397$ A ($8.2_{-1.4}^{+1.4}$ days), CIV $\lambda1549$ A ($11.8_{-2.8}^{+3.0}$ days), and HeII $\lambda1640$ A ($9.0_{-1.9}^{+4.5}$ days) using segments of the emission-line profile that are unaffected by absorption and blending, which results in sampling different velocity ranges for each line. However, we find that the emission-line responses to continuum variations are more complex than a simple smoothed, shifted, and scaled version of the continuum light curve. We also measure velocity-resolved lags for the Ly$\alpha$, and CIV emission lines. The lag profile in the blue wing of Ly$\alpha$ is consistent with virial motion, with longer lags dominating at lower velocities, and shorter lags at higher velocities. The CIV lag profile shows the signature of a thick rotating disk, with the shortest lags in the wings, local peaks at $\pm$ 1500 $\rm km\,s^{-1}$, and a local minimum at line center. The other emission lines are dominated by broad absorption lines and blending with adjacent emission lines. These require detailed models, and will be presented in future work., Comment: Submitted to ApJ. 25 pages, 8 figures, and 6 tables
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- 2023
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35. The Eighteenth Data Release of the Sloan Digital Sky Surveys: Targeting and First Spectra from SDSS-V
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Almeida, Andrés, Anderson, Scott F., Argudo-Fernández, Maria, Badenes, Carles, Barger, Kat, Barrera-Ballesteros, Jorge K., Bender, Chad F., Benitez, Erika, Besser, Felipe, Bizyaev, Dmitry, Blanton, Michael R., Bochanski, John, Bovy, Jo, Brandt, William Nielsen, Brownstein, Joel R., Buchner, Johannes, Bulbul, Esra, Burchett, Joseph N., Díaz, Mariana Cano, Carlberg, Joleen K., Casey, Andrew R., Chandra, Vedant, Cherinka, Brian, Chiappini, Cristina, Coker, Abigail A., Comparat, Johan, Conroy, Charlie, Contardo, Gabriella, Cortes, Arlin, Covey, Kevin, Crane, Jeffrey D., Cunha, Katia, Dabbieri, Collin, Davidson Jr., James W., Davis, Megan C., De Lee, Nathan, Delgado, José Eduardo Méndez, Demasi, Sebastian, Di Mille, Francesco, Donor, John, Dow, Peter, Dwelly, Tom, Eracleous, Mike, Eriksen, Jamey, Fan, Xiaohui, Farr, Emily, Frederick, Sara, Fries, Logan, Frinchaboy, Peter, Gaensicke, Boris T., Ge, Junqiang, Ávila, Consuelo González, Grabowski, Katie, Grier, Catherine, Guiglion, Guillaume, Gupta, Pramod, Hall, Patrick, Hawkins, Keith, Hayes, Christian R., Hermes, J. J., Hernández-García, Lorena, Hogg, David W., Holtzman, Jon A., Ibarra-Medel, Hector Javier, Ji, Alexander, Jofre, Paula, Johnson, Jennifer A., Jones, Amy M., Kinemuchi, Karen, Kluge, Matthias, Koekemoer, Anton, Kollmeier, Juna A., Kounkel, Marina, Krishnarao, Dhanesh, Krumpe, Mirko, Lacerna, Ivan, Lago, Paulo Jakson Assuncao, Laporte, Chervin, Liu, Ang, Liu, Chao, Liu, Xin, Lopes, Alexandre Roman, Macktoobian, Matin, Majewski, Steven R., Malanushenko, Viktor, Maoz, Dan, Masseron, Thomas, Masters, Karen L., Matijevic, Gal, McBride, Aidan, Medan, Ilija, Merloni, Andrea, Morrison, Sean, Myers, Natalie, Mészáros, Szabolcs, Negrete, C. Alenka, Nidever, David L., Nitschelm, Christian, Oravetz, Audrey, Oravetz, Daniel, Pan, Kaike, Peng, Yingjie, Pinsonneault, Marc H., Pogge, Rick, Qiu, Dan, Queiroz, Anna Barbara de Andrade, Ramirez, Solange V., Rix, Hans-Walter, Rosso, Daniela Fernández, Runnoe, Jessie, Salvato, Mara, Sanchez, Sebastian F., Santana, Felipe A., Saydjari, Andrew, Sayres, Conor, Schlaufman, Kevin C., Schneider, Donald P., Schwope, Axel, Serna, Javier, Shen, Yue, Sobeck, Jennifer, Song, Ying-Yi, Souto, Diogo, Spoo, Taylor, Stassun, Keivan G., Steinmetz, Matthias, Straumit, Ilya, Stringfellow, Guy, Sánchez-Gallego, José, Taghizadeh-Popp, Manuchehr, Tayar, Jamie, Thakar, Ani, Tissera, Patricia B., Tkachenko, Andrew, Toledo, Hector Hernandez, Trakhtenbrot, Benny, Trincado, Jose G. Fernandez, Troup, Nicholas, Trump, Jonathan R., Tuttle, Sarah, Ulloa, Natalie, Vazquez-Mata, Jose Antonio, Alfaro, Pablo Vera, Villanova, Sandro, Wachter, Stefanie, Weijmans, Anne-Marie, Wheeler, Adam, Wilson, John, Wojno, Leigh, Wolf, Julien, Xue, Xiang-Xiang, Ybarra, Jason E., Zari, Eleonora, and Zasowski, Gail
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
The eighteenth data release of the Sloan Digital Sky Surveys (SDSS) is the first one for SDSS-V, the fifth generation of the survey. SDSS-V comprises three primary scientific programs, or "Mappers": Milky Way Mapper (MWM), Black Hole Mapper (BHM), and Local Volume Mapper (LVM). This data release contains extensive targeting information for the two multi-object spectroscopy programs (MWM and BHM), including input catalogs and selection functions for their numerous scientific objectives. We describe the production of the targeting databases and their calibration- and scientifically-focused components. DR18 also includes ~25,000 new SDSS spectra and supplemental information for X-ray sources identified by eROSITA in its eFEDS field. We present updates to some of the SDSS software pipelines and preview changes anticipated for DR19. We also describe three value-added catalogs (VACs) based on SDSS-IV data that have been published since DR17, and one VAC based on the SDSS-V data in the eFEDS field., Comment: Accepted to ApJS
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- 2023
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36. The Sloan Digital Sky Survey Reverberation Mapping Project: The Black Hole Mass$-$Stellar Mass Relations at $0.2\lesssim z\lesssim 0.8$
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Li, Jennifer I-Hsiu, Shen, Yue, Ho, Luis C., Brandt, W. N., Grier, Catherine J., Hall, Patrick B., Homayouni, Y., Koekemoer, Anton M., Schneider, Donald P., and Trump, Jonathan R.
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Astrophysics - Astrophysics of Galaxies - Abstract
We measure the correlation between black-hole mass $M_{\rm BH}$ and host stellar mass $M_*$ for a sample of 38 broad-line quasars at $0.2\lesssim z\lesssim 0.8$ (median redshift $z_{\rm med}=0.5$). The black-hole masses are derived from a dedicated reverberation mapping program for distant quasars, and the stellar masses are estimated from two-band optical+IR HST imaging. Most of these quasars are well centered within $\lesssim 1$kpc from the host galaxy centroid, with only a few cases in merging/disturbed systems showing larger spatial offsets. Our sample spans two orders of magnitude in stellar mass ($\sim 10^9-10^{11}\,M_\odot$) and black-hole mass ($\sim 10^7-10^9\,M_\odot$), and reveals a significant correlation between the two quantities. We find a best-fit intrinsic (i.e., selection effects corrected) $M_{\rm BH}-M_{\rm *,host}$ relation of $\log (M_{\rm BH}/M_{\rm \odot})=7.01_{-0.33}^{+0.23} + 1.74_{-0.64}^{+0.64}\log (M_{\rm *,host}/10^{10}M_{\rm \odot})$, with an intrinsic scatter of $0.47_{-0.17}^{+0.24}$dex. Decomposing our quasar hosts into bulges and disks, there is a similar $M_{\rm BH}-M_{\rm *,bulge}$ relation with a slightly larger scatter, likely caused by systematic uncertainties in the bulge-disk decomposition. The $M_{\rm BH}-M_{\rm *,host}$ relation at $z_{\rm med}=0.5$ is similar to that in local quiescent galaxies, with negligible evolution over the redshift range probed by our sample. With direct black-hole masses from reverberation mapping and a large dynamical range of the sample, selection biases do not appear to affect our conclusions significantly. Our results, along with other samples in the literature, suggest that the locally-measured black-hole mass$-$host stellar mass relation is already in place at $z\sim 1$., Comment: 23 pages, 10 figures (Fig 9 is the key figure). Submitted to ApJ. The full figure set and ancillary data products can be found at ftp://quasar.astro.illinois.edu/public/sdssrm/paper_data/Li_2023_HST_host
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- 2023
37. VLT/UVES Observation of the SDSS J2357-0048 Outflow
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Byun, Doyee, Arav, Nahum, and Hall, Patrick B.
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Astrophysics - Astrophysics of Galaxies - Abstract
We found a broad absorption line (BAL) outflow in the VLT/UVES spectrum of the quasar SDSS J235702.54-004824.0, in which we identified four subcomponents. We measured the column densities of the ions in one of the subcomponents ($v$ = -1600 km s$^{-1}$), which include O I and Fe II. We found the kinetic luminosity of this component to be at most ~2.4% of the quasar's Eddington luminosity. This is near the amount required to contribute to AGN feedback. We also examined the time-variability of a C IV mini-BAL found at $v$ = -8700 km s$^{-1}$, which shows a shallower and narrower absorption feature attached to it in previous SDSS observations from 2000 and 2001, but not in the spectra from 2005 and onwards., Comment: 10 pages, 6 figures. Accepted for publication on MNRAS
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- 2022
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38. The Farthest Quasar Mini-BAL Outflow from its Central Source: VLT/UVES Observation of SDSSJ0242+0049
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Byun, Doyee, Arav, Nahum, and Hall, Patrick B.
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Astrophysics - Astrophysics of Galaxies - Abstract
We analyze VLT/UVES observations of the quasar SDSS J024221.87+004912.6. We identify four absorption outflow systems: a CIV BAL at $v\approx -18,000 \text{ km s}^{-1}$, and three narrower low-ionization systems with centroid velocities ranging from -1200 to -3500 km s$^{-1}$. These outflows show similar physical attributes to the [OIII] outflows studied by arXiv:1305.6922. We find that two of the systems are energetic enough to contribute to AGN feedback, with one system reaching above 5% of the quasar's Eddington luminosity. We also find that this system is at a distance of 67 kpc away from the quasar, the farthest detected mini-BAL absorption outflow from its central source to date. In addition, we examine the time variability of the BAL, and find that its velocity monotonically increases, while the trough itself becomes shallower over time., Comment: 14 pages, 6 figures, accepted for publication in ApJ
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- 2022
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39. AGN STORM 2: I. First results: A Change in the Weather of Mrk 817
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Kara, Erin, Mehdipour, Missagh, Kriss, Gerard A., Cackett, Edward M., Arav, Nahum, Barth, Aaron J., Byun, Doyee, Brotherton, Michael S., De Rosa, Gisella, Gelbord, Jonathan, Santisteban, Juan V. Hernandez, Hu, Chen, Kaastra, Jelle, Landt, Hermine, Li, Yan-Rong, Miller, Jake A., Montano, John, Partington, Ethan, Aceituno, Jesus, Bai, Jin-Ming, Bao, Dongwei, Bentz, Misty C., Brink, Thomas G., Chelouche, Doron, Chen, Yong-Jie, Bonta, Elena Dalla, Dehghanian, Maryam, Du, Pu, Edelson, Rick, Ferland, Gary J., Ferrarese, Laura, Fian, Carina, Filippenko, Alexei V., Fischer, Travis, Goad, Michael R., Buitrago, Diego H. Gonzalez, Gorjian, Varoujan, Grier, Catherine J., Guo, Wei-Jian, Hall, Patrick B., Homayouni, Y., Horne, Keith, Ilic, Dragana, Jiang, Bo-Wei, Joner, Michael D., Kaspi, Shai, Kochanek, Christopher S., Korista, Kirk T., Kynoch, Daniel, Li, Sha-Sha, Liu, Jun-Rong, Hardy, Ian M. Mc, McLane, Jacob N., Mitchell, Jake A. J., Netzer, Hagai, Olson, Kianna A., Pogge, Richard W., Popovic, Luka C., Proga, Daniel, Storchi-Bergmann, Thaisa, Strasburger, Erika, Treu, Tommaso, Vestergaard, Marianne, Wang, Jian-Min, Ward, Martin J., Waters, Tim, Williams, Peter R., Yang, Sen, Yao, Zhu-Heng, Zastrocky, Theodora E., Zhai, Shuo, and Zu, Ying
- Subjects
Astrophysics - High Energy Astrophysical Phenomena ,Astrophysics - Astrophysics of Galaxies - Abstract
We present the first results from the ongoing, intensive, multi-wavelength monitoring program of the luminous Seyfert 1 galaxy Mrk 817. While this AGN was, in part, selected for its historically unobscured nature, we discovered that the X-ray spectrum is highly absorbed, and there are new blueshifted, broad and narrow UV absorption lines, which suggest that a dust-free, ionized obscurer located at the inner broad line region partially covers the central source. Despite the obscuration, we measure UV and optical continuum reverberation lags consistent with a centrally illuminated Shakura-Sunyaev thin accretion disk, and measure reverberation lags associated with the optical broad line region, as expected. However, in the first 55 days of the campaign, when the obscuration was becoming most extreme, we observe a de-coupling of the UV continuum and the UV broad emission line variability. The correlation recovers in the next 42 days of the campaign, as Mrk 817 enters a less obscured state. The short CIV and Ly alpha lags suggest that the accretion disk extends beyond the UV broad line region., Comment: 28 pages, 14 figures, submitted to ApJ. Comments welcome
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- 2021
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40. Comparing adult social care systems in the UK
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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41. Conclusion: between care paradigms
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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42. References
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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43. What is social care policy for?
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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44. The limits of social care reform
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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45. Copyright Page
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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46. Front Matter
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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47. The outcomes of social care reform
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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48. Index
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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49. Territorial policy communities: scale, style and scope
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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50. The mechanisms of social care reform
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Needham, Catherine, primary and Hall, Patrick, additional
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- 2023
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