Search

Your search keyword '"Vogler H"' showing total 365 results
Start Over Author "Vogler H"
365 results on '"Vogler H"'

1. The Lick AGN Monitoring Project 2016: Dynamical Modeling of Velocity-Resolved H\b{eta} Lags in Luminous Seyfert Galaxies

Author

Villafaña, Lizvette, Williams, Peter R., Treu, Tommaso, Brewer, Brendon J., Barth, Aaron J., U, Vivian, Bennert, Vardha N., Vogler, H. Alexander, Guo, Hengxiao, Bentz, Misty C., Canalizo, Gabriela, Filippenko, Alexei V., Gates, Elinor, Hamann, Frederick, Joner, Michael D., Malkan, Matthew A., Woo, Jong-Hak, Abolfathi, Bela, Abramson, L. E., Armen, Stephen F., Bae, Hyun-Jin, Bohn, Thomas, Boizelle, Benjamin D., Bostroem, Azalee, Brandel, Andrew, Brink, Thomas G., Channa, Sanyum, Cooper, M. C., Cosens, Maren, Donohue, Edward, Fillingham, Sean P., Gonzalez-Buitrago, Diego, Halevi, Goni, Halle, Andrew, Hood, Carol E., Horne, Keith, Horst, J. Chuck, de Kouchkovsky, Maxime, Kuhn, Benjamin, Kumar, Sahana, Leonard, Douglas C., Loveland, Donald, Manzano-King, Christina, McHardy, Ian, Michel, Raul, Olaes, Melanie Kae B., Park, Daeseong, Park, Songyoun, Pei, Liuyi, Ross, Timothy W., Runco, Jordan N., Samuel, Jenna, Sanchez, Javier, Scott, Bryan, Sexton, Remington O., Shin, Jaejin, Shivvers, Isaac, Spencer, Chance L., Stahl, Benjamin E., Stegman, Samantha, Stomberg, Isak, Valenti, Stefano, Walsh, Jonelle L., Yuk, Heechan, and Zheng, WeiKang

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We have modeled the velocity-resolved reverberation response of the H\b{eta} broad emission line in nine Seyfert 1 galaxies from the Lick Active Galactic Nucleus (AGN) Monitioring Project 2016 sample, drawing inferences on the geometry and structure of the low-ionization broad-line region (BLR) and the mass of the central supermassive black hole. Overall, we find that the H\b{eta} BLR is generally a thick disk viewed at low to moderate inclination angles. We combine our sample with prior studies and investigate line-profile shape dependence, such as log10(FWHM/{\sigma}), on BLR structure and kinematics and search for any BLR luminosity-dependent trends. We find marginal evidence for an anticorrelation between the profile shape of the broad H\b{eta} emission line and the Eddington ratio, when using the root-mean-square spectrum. However, we do not find any luminosity-dependent trends, and conclude that AGNs have diverse BLR structure and kinematics, consistent with the hypothesis of transient AGN/BLR conditions rather than systematic trends.

Published
2022
Full Text
View/download PDF

2. The Lick AGN Monitoring Project 2016: Velocity-Resolved H{\beta} Lags in Luminous Seyfert Galaxies

Author

U, Vivian, Barth, Aaron J., Vogler, H. Alexander, Guo, Hengxiao, Treu, Tommaso, Bennert, Vardha N., Canalizo, Gabriela, Filippenko, Alexei V., Gates, Elinor, Hamann, Frederick, Joner, Michael D., Malkan, Matthew A., Pancoast, Anna, Williams, Peter R., Woo, Jong-Hak, Abolfathi, Bela, Abramson, L. E., Armen, Stephen F., Bae, Hyun-Jin, Bohn, Thomas, Boizelle, Benjamin D., Bostroem, Azalee, Brandel, Andrew, Brink, Thomas G., Channa, Sanyum, Cooper, M. C., Cosens, Maren, Donohue, Edward, Fillingham, Sean P., González-Buitrago, Diego, Halevi, Goni, Halle, Andrew, Hood, Carol E., Horne, Keith, Horst, J. Chuck, de Kouchkovsky, Maxime, Kuhn, Benjamin, Kumar, Sahana, Leonard, Douglas C., Loveland, Donald, Manzano-King, Christina, McHardy, Ian, Michel, Raúl, Olaes, Melanie Kae B., Park, Daeseong, Park, Songyoun, Pei, Liuyi, Ross, Timothy W., Runco, Jordan N., Samuel, Jenna, Sánchez, Javier, Scott, Bryan, Sexton, Remington O., Shin, Jaejin, Shivvers, Isaac, Spencer, Chance L., Stahl, Benjamin E., Stegman, Samantha, Stomberg, Isak, Valenti, Stefano, Villafaña, L., Walsh, Jonelle L., Yuk, Heechan, and Zheng, WeiKang

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We carried out spectroscopic monitoring of 21 low-redshift Seyfert 1 galaxies using the Kast double spectrograph on the 3-m Shane telescope at Lick Observatory from April 2016 to May 2017. Targeting active galactic nuclei (AGN) with luminosities of {\lambda}L{\lambda} (5100 {\AA}) = 10^44 erg/s and predicted H{\beta} lags of 20-30 days or black hole masses of 10^7-10^8.5 Msun, our campaign probes luminosity-dependent trends in broad-line region (BLR) structure and dynamics as well as to improve calibrations for single-epoch estimates of quasar black hole masses. Here we present the first results from the campaign, including H{\beta} emission-line light curves, integrated H{\beta} lag times (8-30 days) measured against V-band continuum light curves, velocity-resolved reverberation lags, line widths of the broad H{\beta} components, and virial black hole mass estimates (10^7.1-10^8.1 Msun). Our results add significantly to the number of existing velocity-resolved lag measurements and reveal a diversity of BLR gas kinematics at moderately high AGN luminosities. AGN continuum luminosity appears not to be correlated with the type of kinematics that its BLR gas may exhibit. Follow-up direct modeling of this dataset will elucidate the detailed kinematics and provide robust dynamical black hole masses for several objects in this sample., Comment: 34 pages, 14 figures, accepted for publication in ApJ

Published
2021
Full Text
View/download PDF

3. Swift monitoring of NGC 4151: Evidence for a Second X-ray/UV Reprocessing

Author

Edelson, R., Gelbord, J., Cackett, E., Connolly, S., Done, C., Fausnaugh, M., Gardner, E., Gehrels, N., Goad, M., Horne, K., McHardy, I., Peterson, B. M., Vaughan, S., Vestergaard, M., Breeveld, A., Barth, A. J., Bentz, M., Bottorff, M., Brandt, W. N., Crawford, S. M., Bonta, E. Dalla, Emmanoulopoulos, D., Evans, P., Jaimes, R. Figuera, Filippenko, A. V., Ferland, G., Grupe, D., Joner, M., Kennea, J., Korista, K. T., Krimm, H. A., Kriss, G., Leonard, D. C., Mathur, S., Netzer, H., Nousek, J., Page, K., Romero-Colmenero, E., Siegel, M., Starkey, D. A., Treu, T., Vogler, H. A., Winkler, H., and Zheng, W.

Subjects
Astrophysics - High Energy Astrophysical Phenomena
Abstract

Swift monitoring of NGC 4151 with ~6 hr sampling over a total of 69 days in early 2016 is used to construct light curves covering five bands in the X-rays (0.3-50 keV) and six in the ultraviolet (UV)/optical (1900-5500 A). The three hardest X-ray bands (>2.5 keV) are all strongly correlated with no measurable interband lag while the two softer bands show lower variability and weaker correlations. The UV/optical bands are significantly correlated with the X-rays, lagging ~3-4 days behind the hard X-rays. The variability within the UV/optical bands is also strongly correlated, with the UV appearing to lead the optical by ~0.5-1 day. This combination of >~3 day lags between the X-rays and UV and <~1 day lags within the UV/optical appears to rule out the "lamp-post" reprocessing model in which a hot, X-ray emitting corona directly illuminates the accretion disk, which then reprocesses the energy in the UV/optical. Instead, these results appear consistent with the Gardner & Done picture in which two separate reprocessings occur: first, emission from the corona illuminates an extreme-UV-emitting toroidal component that shields the disk from the corona; this then heats the extreme-UV component which illuminates the disk and drives its variability., Comment: 14 pages, 6 figures, 7 tables. To appear in ApJ April 2017 issue. This version incorporates minor revisions to conform to published version and corrects the links to the author names above

Published
2017
Full Text
View/download PDF

4. Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj

Author

Zheng, WeiKang, Filippenko, Alexei V., Mauerhan, Jon, Graham, Melissa L., Yuk, Heechan, Hosseinzadeh, Griffin, Silverman, Jeffrey M., Rui, Liming, Arbour, Ron, Foley, Ryan J., Abolfathi, Bela, Abramson, Louis E., Arcavi, Iair, Barth, Aaron J., Bennert, Vardha N., Brandel, Andrew P., Cooper, Michael C., Cosens, Maren, Fillingham, Sean P., Fulton, Benjamin J., Halevi, Goni, Howell, D. Andrew, Hsyu, Tiffany, Kelly, Patrick L., Kumar, Sahana, Li, Linyi, Li, Wenxiong, Malkan, Matthew A., Manzano-King, Christina, McCully, Curtis, Nugent, Peter E., Pan, Yen-Chen, Pei, Liuyi, Scott, Bryan, Sexton, Remington Oliver, Shivvers, Isaac, Stahl, Benjamin, Treu, Tommaso, Valenti, Stefano, Vogler, H. Alexander, Walsh, Jonelle L., and Wang, Xiaofeng

Subjects
Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena
Abstract

The Type~Ia supernova (SN~Ia) 2016coj in NGC 4125 (redshift $z=0.004523$) was discovered by the Lick Observatory Supernova Search 4.9 days after the fitted first-light time (FFLT; 11.1 days before $B$-band maximum). Our first detection (pre-discovery) is merely $0.6\pm0.5$ day after the FFLT, making SN 2016coj one of the earliest known detections of a SN Ia. A spectrum was taken only 3.7 hr after discovery (5.0 days after the FFLT) and classified as a normal SN Ia. We performed high-quality photometry, low- and high-resolution spectroscopy, and spectropolarimetry, finding that SN 2016coj is a spectroscopically normal SN Ia, but with a high velocity of \ion{Si}{2} $\lambda$6355 ($\sim 12,600$\,\kms\ around peak brightness). The \ion{Si}{2} $\lambda$6355 velocity evolution can be well fit by a broken-power-law function for up to a month after the FFLT. SN 2016coj has a normal peak luminosity ($M_B \approx -18.9 \pm 0.2$ mag), and it reaches a $B$-band maximum \about16.0~d after the FFLT. We estimate there to be low host-galaxy extinction based on the absence of Na~I~D absorption lines in our low- and high-resolution spectra. The spectropolarimetric data exhibit weak polarization in the continuum, but the \ion{Si}{2} line polarization is quite strong ($\sim 0.9\% \pm 0.1\%$) at peak brightness., Comment: Submitted

Published
2016
Full Text
View/download PDF

5. Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj

Author

Zheng, WeiKang, Filippenko, Alexei V, Mauerhan, Jon, Graham, Melissa L, Yuk, Heechan, Hosseinzadeh, Griffin, Silverman, Jeffrey M, Rui, Liming, Arbour, Ron, Foley, Ryan J, Abolfathi, Bela, Abramson, Louis E, Arcavi, Iair, Barth, Aaron J, Bennert, Vardha N, Brandel, Andrew P, Cooper, Michael C, Cosens, Maren, Fillingham, Sean P, Fulton, Benjamin J, Halevi, Goni, Howell, D Andrew, Hsyu, Tiffany, Kelly, Patrick L, Kumar, Sahana, Li, Linyi, Li, Wenxiong, Malkan, Matthew A, Manzano-King, Christina, McCully, Curtis, Nugent, Peter E, Pan, Yen-Chen, Pei, Liuyi, Scott, Bryan, Sexton, Remington Oliver, Shivvers, Isaac, Stahl, Benjamin, Treu, Tommaso, Valenti, Stefano, Vogler, H Alexander, Walsh, Jonelle L, and Wang, Xiaofeng

Subjects
Astronomical Sciences, Physical Sciences, supernovae: general, supernovae: individual, astro-ph.SR, astro-ph.GA, astro-ph.HE, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Physical Chemistry (incl. Structural), Astronomy & Astrophysics, Astronomical sciences, Particle and high energy physics, Space sciences
Abstract

The Type Ia supernova (SN Ia) 2016coj in NGC 4125 (redshift z = 0.00452 ± 0.00006) was discovered by the Lick Observatory Supernova Search 4.9 days after the fitted first-light time (FFLT; 11.1 days before B-band maximum). Our first detection (prediscovery) is merely 0.6 ± 0.5 days after the FFLT, making SN 2016coj one of the earliest known detections of an SN Ia. A spectrum was taken only 3.7 hr after discovery (5.0 days after the FFLT) and classified as a normal SN Ia. We performed high-quality photometry, low- and high-resolution spectroscopy, and spectropolarimetry, finding that SN 2016coj is a spectroscopically normal SN Ia, but the velocity of Si ii λ6355 around peak brightness (∼12,600 kms-1) is a bit higher than that of typical normal SNe. The Si ii λ6355 velocity evolution can be well fit by a broken-power-law function for up to a month after the FFLT. SN 2016coj has a normal peak luminosity (MB ≈ -18.9 ± 0.2 mag), and it reaches a B-band maximum ∼16.0 days after the FFLT. We estimate there to be low host-galaxy extinction based on the absence of Na i D absorption lines in our low- and high-resolution spectra. The spectropolarimetric data exhibit weak polarization in the continuum, but the Si ii line polarization is quite strong (∼0.9% ± 0.1%) at peak brightness.

Published
2017

7. The Lick AGN Monitoring Project 2016: Dynamical Modeling of Velocity-resolved Hβ Lags in Luminous Seyfert Galaxies

Author

Villafaña, Lizvette, primary, Williams, Peter R., additional, Treu, Tommaso, additional, Brewer, Brendon J., additional, Barth, Aaron J., additional, U, Vivian, additional, Bennert, Vardha N., additional, Alexander Vogler, H., additional, Guo, Hengxiao, additional, Bentz, Misty C., additional, Canalizo, Gabriela, additional, Filippenko, Alexei V., additional, Gates, Elinor, additional, Hamann, Frederick, additional, Joner, Michael D., additional, Malkan, Matthew A., additional, Woo, Jong-Hak, additional, Abolfathi, Bela, additional, Abramson, L. E., additional, Armen, Stephen F., additional, Bae, Hyun-Jin, additional, Bohn, Thomas, additional, Boizelle, Benjamin D., additional, Bostroem, K. Azalee, additional, Brandel, Andrew, additional, Brink, Thomas G., additional, Channa, Sanyum, additional, Cooper, M. C., additional, Cosens, Maren, additional, Donohue, Edward, additional, Fillingham, Sean P., additional, González-Buitrago, Diego, additional, Halevi, Goni, additional, Halle, Andrew, additional, Hood, Carol E., additional, Horne, Keith, additional, Chuck Horst, J., additional, de Kouchkovsky, Maxime, additional, Kuhn, Benjamin, additional, Kumar, Sahana, additional, Leonard, Douglas C., additional, Loveland, Donald, additional, Manzano-King, Christina, additional, McHardy, Ian, additional, Michel, Raúl, additional, Kae B. Olaes, Melanie, additional, Park, Daeseong, additional, Park, Songyoun, additional, Pei, Liuyi, additional, Ross, Timothy W., additional, Runco, Jordan N., additional, Sánchez, Javier, additional, Scott, Bryan, additional, Sexton, Remington O., additional, Shin, Jaejin, additional, Shivvers, Isaac, additional, Spencer, Chance L., additional, Stahl, Benjamin E., additional, Stegman, Samantha, additional, Stomberg, Isak, additional, Valenti, Stefano, additional, Walsh, Jonelle L., additional, Yuk, Heechan, additional, and Zheng, WeiKang, additional

Published
2022
Full Text
View/download PDF

9. The Lick AGN Monitoring Project 2016: Velocity-resolved Hβ Lags in Luminous Seyfert Galaxies

Author

U, Vivian, primary, Barth, Aaron J., additional, Vogler, H. Alexander, additional, Guo, Hengxiao, additional, Treu, Tommaso, additional, Bennert, Vardha N., additional, Canalizo, Gabriela, additional, Filippenko, Alexei V., additional, Gates, Elinor, additional, Hamann, Frederick, additional, Joner, Michael D., additional, Malkan, Matthew A., additional, Pancoast, Anna, additional, Williams, Peter R., additional, Woo, Jong-Hak, additional, Abolfathi, Bela, additional, Abramson, L. E., additional, Armen, Stephen F., additional, Bae, Hyun-Jin, additional, Bohn, Thomas, additional, Boizelle, Benjamin D., additional, Bostroem, Azalee, additional, Brandel, Andrew, additional, Brink, Thomas G., additional, Channa, Sanyum, additional, Cooper, M. C., additional, Cosens, Maren, additional, Donohue, Edward, additional, Fillingham, Sean P., additional, González-Buitrago, Diego, additional, Halevi, Goni, additional, Halle, Andrew, additional, Hood, Carol E., additional, Horne, Keith, additional, Horst, J. Chuck, additional, Kouchkovsky, Maxime de, additional, Kuhn, Benjamin, additional, Kumar, Sahana, additional, Leonard, Douglas C., additional, Loveland, Donald, additional, Manzano-King, Christina, additional, McHardy, Ian, additional, Michel, Raúl, additional, Olaes, Melanie Kae B., additional, Park, Daeseong, additional, Park, Songyoun, additional, Pei, Liuyi, additional, Ross, Timothy W., additional, Runco, Jordan N., additional, Samuel, Jenna, additional, Sánchez, Javier, additional, Scott, Bryan, additional, Sexton, Remington O., additional, Shin, Jaejin, additional, Shivvers, Isaac, additional, Spencer, Chance L., additional, Stahl, Benjamin E., additional, Stegman, Samantha, additional, Stomberg, Isak, additional, Valenti, Stefano, additional, Villafaña, L., additional, Walsh, Jonelle L., additional, Yuk, Heechan, additional, and Zheng, WeiKang, additional

Published
2022
Full Text
View/download PDF

14. The Lick AGN Monitoring Project 2016: Dynamical Modeling of Velocity-resolved H β Lags in Luminous Seyfert Galaxies.

Author

Villafaña, Lizvette, Williams, Peter R., Treu, Tommaso, Brewer, Brendon J., Barth, Aaron J., U, Vivian, Bennert, Vardha N., Alexander Vogler, H., Guo, Hengxiao, Bentz, Misty C., Canalizo, Gabriela, Filippenko, Alexei V., Gates, Elinor, Hamann, Frederick, Joner, Michael D., Malkan, Matthew A., Woo, Jong-Hak, Abolfathi, Bela, Abramson, L. E., and Armen, Stephen F.

Subjects
ACTIVE galactic nuclei, SUPERMASSIVE black holes, SEYFERT galaxies, ACTIVE galaxies
Abstract

We have modeled the velocity-resolved reverberation response of the H β broad emission line in nine Seyfert 1 galaxies from the Lick Active Galactic Nucleus (AGN) Monitoring Project 2016 sample, drawing inferences on the geometry and structure of the low-ionization broad-line region (BLR) and the mass of the central supermassive black hole. Overall, we find that the H β BLR is generally a thick disk viewed at low to moderate inclination angles. We combine our sample with prior studies and investigate line-profile shape dependence, such as log 10 (FWHM / σ) , on BLR structure and kinematics and search for any BLR luminosity-dependent trends. We find marginal evidence for an anticorrelation between the profile shape of the broad H β emission line and the Eddington ratio, when using the rms spectrum. However, we do not find any luminosity-dependent trends, and conclude that AGNs have diverse BLR structure and kinematics, consistent with the hypothesis of transient AGN/BLR conditions rather than systematic trends. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

17. The Lick AGN Monitoring Project 2016: Velocity-resolved H β Lags in Luminous Seyfert Galaxies.

Author

U, Vivian, Barth, Aaron J., Vogler, H. Alexander, Guo, Hengxiao, Treu, Tommaso, Bennert, Vardha N., Canalizo, Gabriela, Filippenko, Alexei V., Gates, Elinor, Hamann, Frederick, Joner, Michael D., Malkan, Matthew A., Pancoast, Anna, Williams, Peter R., Woo, Jong-Hak, Abolfathi, Bela, Abramson, L. E., Armen, Stephen F., Bae, Hyun-Jin, and Bohn, Thomas

Subjects
SEYFERT galaxies, QUASARS, ACTIVE galactic nuclei, LIGHT curves, BLACK holes, SUPERMASSIVE black holes
Abstract

We carried out spectroscopic monitoring of 21 low-redshift Seyfert 1 galaxies using the Kast double spectrograph on the 3 m Shane telescope at Lick Observatory from 2016 April to 2017 May. Targeting active galactic nuclei (AGNs) with luminosities of λ L λ (5100 Ă...) ≈ 1044 erg sâˆ'1 and predicted H β lags of ∼20â€"30 days or black hole masses of 107â€"108.5 M ⊙, our campaign probes luminosity-dependent trends in broad-line region (BLR) structure and dynamics as well as to improve calibrations for single-epoch estimates of quasar black hole masses. Here we present the first results from the campaign, including H β emission-line light curves, integrated H β lag times (8â€"30 days) measured against V -band continuum light curves, velocity-resolved reverberation lags, line widths of the broad H β components, and virial black hole mass estimates (107.1â€"108.1 M ⊙). Our results add significantly to the number of existing velocity-resolved lag measurements and reveal a diversity of BLR gas kinematics at moderately high AGN luminosities. AGN continuum luminosity appears not to be correlated with the type of kinematics that its BLR gas may exhibit. Follow-up direct modeling of this data set will elucidate the detailed kinematics and provide robust dynamical black hole masses for several objects in this sample. [ABSTRACT FROM AUTHOR]

Published
2022
Full Text
View/download PDF

23. In Emerging Tools for Micro and Nano Manipulation

Author

Felekis, D, Vogler, H, Grossniklaus, Grossniklaus, Nelson, Bradley J, Felekis, D ( D ), Vogler, H ( H ), Grossniklaus, G ( Grossniklaus ), Nelson, B J ( Bradley J ), Grossniklaus, U, Felekis, D, Vogler, H, Grossniklaus, Grossniklaus, Nelson, Bradley J, Felekis, D ( D ), Vogler, H ( H ), Grossniklaus, G ( Grossniklaus ), Nelson, B J ( Bradley J ), and Grossniklaus, U

Published
2014

24. SwiftMonitoring of NGC 4151: Evidence for a Second X-Ray/UV Reprocessing

Author

Edelson, R., primary, Gelbord, J., additional, Cackett, E., additional, Connolly, S., additional, Done, C., additional, Fausnaugh, M., additional, Gardner, E., additional, Gehrels, N., additional, Goad, M., additional, Horne, K., additional, McHardy, I., additional, Peterson, B. M., additional, Vaughan, S., additional, Vestergaard, M., additional, Breeveld, A., additional, Barth, A. J., additional, Bentz, M., additional, Bottorff, M., additional, Brandt, W. N., additional, Crawford, S. M., additional, Bontà, E. Dalla, additional, Emmanoulopoulos, D., additional, Evans, P., additional, Jaimes, R. Figuera, additional, Filippenko, A. V., additional, Ferland, G., additional, Grupe, D., additional, Joner, M., additional, Kennea, J., additional, Korista, K. T., additional, Krimm, H. A., additional, Kriss, G., additional, Leonard, D. C., additional, Mathur, S., additional, Netzer, H., additional, Nousek, J., additional, Page, K., additional, Romero-Colmenero, E., additional, Siegel, M., additional, Starkey, D. A., additional, Treu, T., additional, Vogler, H. A., additional, Winkler, H., additional, and Zheng, W., additional

Published
2017
Full Text
View/download PDF

25. Swift Monitoring of NGC 4151:Evidence for a Second X-Ray/UV Reprocessing

Author

Edelson, R., Gelbord, J., Cackett, E., Connolly, S., Done, C., Fausnaugh, M., Gardner, E., Gehrels, N., Goad, M., Horne, K., McHardy, I., Peterson, B. M., Vaughan, S., Vestergaard, M., Breeveld, A., Barth, A. J., Bentz, M., Bottorff, M., Brandt, W. N., Crawford, S. M., Bonta, E. Dalla, Emmanoulopoulos, D., Evans, P., Jaimes, R. Figuera, Filippenko, A. V., Ferland, G., Grupe, D., Joner, M., Kennea, J., Korista, K. T., Krimm, H. A., Kriss, G., Leonard, D. C., Mathur, S., Netzer, H., Nousek, J., Page, K., Romero-Colmenero, E., Siegel, M., Starkey, D. A., Treu, T., Vogler, H. A., Winkler, H., Zheng, W., Edelson, R., Gelbord, J., Cackett, E., Connolly, S., Done, C., Fausnaugh, M., Gardner, E., Gehrels, N., Goad, M., Horne, K., McHardy, I., Peterson, B. M., Vaughan, S., Vestergaard, M., Breeveld, A., Barth, A. J., Bentz, M., Bottorff, M., Brandt, W. N., Crawford, S. M., Bonta, E. Dalla, Emmanoulopoulos, D., Evans, P., Jaimes, R. Figuera, Filippenko, A. V., Ferland, G., Grupe, D., Joner, M., Kennea, J., Korista, K. T., Krimm, H. A., Kriss, G., Leonard, D. C., Mathur, S., Netzer, H., Nousek, J., Page, K., Romero-Colmenero, E., Siegel, M., Starkey, D. A., Treu, T., Vogler, H. A., Winkler, H., and Zheng, W.

Published
2017

26. Dignitätsbeurteilung fokaler Leberläsionen mit der kontrastverstärkten MRT mit SHU 555 A im Vergleich zur nativen MRT und zur Mehrzeilen-Detektor-Spiral-CT

Author

J.-A. Koch, Ludger Wilhelm Poll, Andreas Saleh, Ulrich Mödder, G. Jung, Vogler H, Mathias Cohnen, M. Wettstein, and Reinhart Willers

Subjects
medicine.medical_specialty, Cirrhosis, medicine.diagnostic_test, business.industry, Gold standard (test), medicine.disease, Lesion, medicine.anatomical_structure, Biopsy, Medicine, Abdomen, Radiology, Nuclear Medicine and imaging, Multislice, Radiology, medicine.symptom, Differential diagnosis, business, Nuclear medicine, Spiral
Abstract

PURPOSE To evaluate the ability of contrast-enhanced MRI with SHU 555 A to provide additional information for characterization of focal liver tumors compared with non-enhanced MRI and multislice spiral CT. MATERIALS AND METHODS In a prospective manner the images of 45 patients who underwent multislice spiral CT, unenhanced MRI alone and unenhanced and SHU 555 A-enhanced MRI including dynamic imaging at a field strength of 1.0 T were analyzed in a blinded reading. The readers had to determine on a scale from 1 to 5 whether a tumor was benign or malignant. Furthermore, the readers had to give a definitive diagnosis for each lesion. A true cut needle biopsy served as gold standard against which all imaging procedures were compared. RESULTS The sensitivity for differentiation malignant vs. benign lesion was 77 % with spiral CT, 72 % with unenhanced MRI and 94 % with SHU 555 A-enhanced MRI, respectively (p < 0.05). The specificity for spiral CT was 73 %, for unenhanced MRI 83 % and for contrast-enhanced MRI 83 %, respectively (n. s.). Compared with the histopathologic results, the correct diagnosis was made with spiral CT in 25/45 (56 %), unenhanced MRI in 16/45 (36 %) and contrast-enhanced MRI in 32/45 (71 %) of the patients (p < 0.05). For the subgroup of patients with liver cirrhosis, the correct diagnosis was established with spiral CT in 16/23 (70 %), unenhanced MRI in 9/23 (39 %) and contrast-enhanced MRI in 19/23 (83 %) of the patients (p < 0.05). CONCLUSION Contrast-enhanced MRI with SHU 555 A has the ability to improve the differential diagnosis of focal liver tumors compared with unenhanced MRI and multislice spiral CT.

Published
2005
Full Text
View/download PDF

28. High-Energy Processes in Organometallic Chemistry

Author

KENNETH S. SUSLICK, Peter L. Timms, J. L. Beauchamp, D. J. Trevor, A. Kaldor, V. Vaida, Tom Seder, Andrew Ouderkirk, Stephen Church, Eric Weitz, T. R. Fletcher, R. N. Rosenfeld, James J. Turner, Michael A. Healy, Martyn Poliakoff, Peter C. Ford, Alan E. Friedman, Douglas J. Taube, Manfred J. Mirbach, A. Vogler, H. Kunk, Kenneth S. Suslick, M. Joan Comstock

Published
1987

29. Excited States and Reactive Intermediates

Author

A. B. P. LEVER, Hans U. Güdel, L. G. Vanquickenborne, L. Haspeslagh, M. Hendrickx, Hans-Herbert Schmidtke, Jeffrey I. Zink, Lee Tutt, Y. Y. Yang, Robin J. H. Clark, D. J. Stufkens, A. Oskam, M. W. Kokkes, John F. Endicott, Ronald B. Lessard, Yabin Lei, Chong Kul Ryu, R. Tamilarasan, H. Hennig, D. Rehorek, A. Vogler, H., A. B. P. Lever, M. Joan Comstock

Published
1986

40. Early MR detection of experimentally induced cerebral ischemia using magnetic susceptibility contrast agents: comparison between gadopentetate dimeglumine and iron oxide particles

Author

Reith, W, Forsting, M, Vogler, H, Heiland, S, and Sartor, K

Subjects
Gadolinium DTPA, Male, Blood Volume, Microcirculation, Contrast Media, Gadolinium, Pentetic Acid, Image Enhancement, Ferric Compounds, Magnetic Resonance Imaging, Microradiography, Brain Ischemia, Cerebral Angiography, Rats, Capillary Permeability, Disease Models, Animal, Drug Combinations, Magnetics, Meglumine, Cerebrovascular Circulation, Organometallic Compounds, Animals, Comparative Study, Rats, Wistar
Abstract

PURPOSE: To evaluate early patterns of MR changes in a rat model of cerebral ischemia using the first pass of two magnetic susceptibility contrast agents. METHODS: One hours after endovascular middle cerebral artery occlusion, all animals were examined in an experimental MR unit. After bolus application of gadopentetate dimeglumine and, 10 minutes later, of iron oxide particles, the MR changes of the first pass of these contrast agents were followed using a T2*-weighted fast low-angle shot sequence. Time-density curves of both contrast agents were analyzed and compared. RESULTS: After bolus injection of either (paramagnetic) gadopentetate dimeglumine or superparamagnetic particles, nonischemic brain parenchyma decreased markedly in signal, whereas the ischemic brain area remained relatively hyperintense (and thus became clearly delineated). Only after application of gadopentetate dimeglumine did a mild reduction in signal occur in the ischemic hemisphere, although the main artery was occluded. An explantation for this phenomenon might be residual capillary perfusion (plasma flow), which is detectable only when the smaller (paramagnetic) contrast molecules are being used. CONCLUSIONS: Cerebral perfusion deficits can be detected 1 hour after vascular occlusion with T2*-weighted fast low-angle shot sequences and bolus injection of paramagnetic or superparamagnetic MR contrast agents. Gadopentetate dimeglumine may be used as a marker of microcirculatory plasma flow.

Published
1995

45. Analysis of fertility in patients with stage 1 non-seminomatous germ-cell tumours (NSGCT). The German prospective multicenter trial

Author

Siener, R., primary, Albers, P., additional, Kliesch, S., additional, Weißbach, L., additional, Höchel, S., additional, Stoiber, E., additional, Dombowski, J., additional, Heidenreich, A., additional, Kuczyk, M., additional, Samtleben, M., additional, van Ahlen, H., additional, Hannappel, J., additional, Huland, H., additional, Vogler, H., additional, and Hartmann, M., additional

Published
2003
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results