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Start Over Author "Joshua A. Frieman" Publisher oxford university press (oup)
12 results on '"Joshua A. Frieman"'

1. Optimizing galaxy samples for clustering measurements in photometric surveys

Author

Dimitrios Tanoglidis, Chihway Chang, and Joshua A. Frieman

Subjects
Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, Sigma, Astronomy and Astrophysics, Context (language use), Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Cosmology, Redshift, Galaxy, Space and Planetary Science, Dark energy, Cluster analysis, Astrophysics - Cosmology and Nongalactic Astrophysics, Photometric redshift
Abstract

When analyzing galaxy clustering in multi-band imaging surveys, there is a trade-off between selecting the largest galaxy samples (to minimize the shot noise) and selecting samples with the best photometric redshift (photo-z) precision, which generally include only a small subset of galaxies. In this paper, we systematically explore this trade-off. Our analysis is targeted towards the third year data of the Dark Energy Survey (DES), but our methods hold generally for other data sets. Using a simple Gaussian model for the redshift uncertainties, we carry out a Fisher matrix forecast for cosmological constraints from angular clustering in the redshift range $z = 0.2-0.95$. We quantify the cosmological constraints using a Figure of Merit (FoM) that measures the combined constraints on $\Omega_m$ and $\sigma_8$ in the context of $\Lambda$CDM cosmology. We find that the trade-off between sample size and photo-z precision is sensitive to 1) whether cross-correlations between redshift bins are included or not, and 2) the ratio of the redshift bin width $\delta z$ and the photo-z precision $\sigma_z$. When cross-correlations are included and the redshift bin width is allowed to vary, the highest FoM is achieved when $\delta z \sim \sigma_z$. We find that for the typical case of $5-10$ redshift bins, optimal results are reached when we use larger, less precise photo-z samples, provided that we include cross-correlations. For samples with higher $\sigma_{z}$, the overlap between redshift bins is larger, leading to higher cross-correlation amplitudes. This leads to the self-calibration of the photo-z parameters and therefore tighter cosmological constraints. These results can be used to help guide galaxy sample selection for clustering analysis in ongoing and future photometric surveys., Comment: 19 pages, 12 figures, to be submitted to MNRAS

Published
2019
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2. First cosmological results using Type Ia supernovae from the Dark Energy Survey: measurement of the Hubble constant

Author

F. J. Castander, Geraint F. Lewis, W. G. Hartley, Alex Drlica-Wagner, T. M. C. Abbott, C. B. D'Andrea, Tesla E. Jeltema, Dragan Huterer, E. J. Sanchez, D. A. Finley, M. Carrasco Kind, Tenglin Li, Santiago Avila, Carlos E. Cunha, Robert C. Nichol, N. E. Sommer, Vinu Vikram, J. Carretero, Santiago González-Gaitán, R. H. Schindler, K. Bechtol, Tamara M. Davis, E. Swann, D. L. Burke, A. Carnero Rosell, Samuel Hinton, Ben Hoyle, J. Annis, Edward Macaulay, David Brooks, M. E. C. Swanson, Peter Nugent, Martin Crocce, G. Gutierrez, Daniel Thomas, Mark Sullivan, Joshua A. Frieman, P. Wiseman, E. Suchyta, August E. Evrard, Antonella Palmese, Ryan J. Foley, N. Kuropatkin, Daniel Scolnic, A. G. Kim, V. Scarpine, S. Allam, Robert A. Gruendl, E. Kasai, R. C. Thomas, M. A. G. Maia, Mathew Smith, C. Lidman, Peter de Nully Brown, Alistair R. Walker, Lluís Galbany, D. Brout, Jacobo Asorey, S. Serrano, Marcelle Soares-Santos, Jennifer L. Marshall, Enrique Gaztanaga, L. N. da Costa, Rob Sharp, M. Sako, Brad E. Tucker, J. Calcino, David J. James, Daniela Carollo, Bruce A. Bassett, D. L. Hollowood, Anais Möller, A. A. Plazas, Pablo Fosalba, Bonnie Zhang, Richard Kessler, Bhuvnesh Jain, J. De Vicente, K. Honscheid, S. A. Uddin, Karl Glazebrook, Marcos Lima, Flavia Sobreira, M. S. Schubnell, Ofer Lahav, I. Sevilla-Noarbe, J. Lasker, Juan Garcia-Bellido, A. Roodman, Juan Estrada, B. Flaugher, H. T. Diehl, C. Davis, Kyler Kuehn, Daniel Gruen, David Bacon, Alexei V. Filippenko, J. Gschwend, Gregory Tarle, P. Martini, Tim Eifler, Elisabeth Krause, Ramon Miquel, P. Doel, Thomas E. Collett, Huan Lin, J. K. Hoormann, A. K. Romer, and Yen-Chen Pan

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cepheid variable, media_common.quotation_subject, Cosmic microwave background, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, symbols.namesake, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, QC, STFC, media_common, Physics, 010308 nuclear & particles physics, Cosmic distance ladder, RCUK, SATÉLITES ARTIFICIAIS, Astronomy and Astrophysics, Universe, Redshift, Space and Planetary Science, astro-ph.CO, Dark energy, symbols, ST/N000668/1, Baryon acoustic oscillations, Astrophysics - Cosmology and Nongalactic Astrophysics, Hubble's law
Abstract

We present an improved measurement of the Hubble constant (H_0) using the 'inverse distance ladder' method, which adds the information from 207 Type Ia supernovae (SNe Ia) from the Dark Energy Survey (DES) at redshift 0.018 < z < 0.85 to existing distance measurements of 122 low redshift (z < 0.07) SNe Ia (Low-z) and measurements of Baryon Acoustic Oscillations (BAOs). Whereas traditional measurements of H_0 with SNe Ia use a distance ladder of parallax and Cepheid variable stars, the inverse distance ladder relies on absolute distance measurements from the BAOs to calibrate the intrinsic magnitude of the SNe Ia. We find H_0 = 67.8 +/- 1.3 km s-1 Mpc-1 (statistical and systematic uncertainties, 68% confidence). Our measurement makes minimal assumptions about the underlying cosmological model, and our analysis was blinded to reduce confirmation bias. We examine possible systematic uncertainties and all are below the statistical uncertainties. Our H_0 value is consistent with estimates derived from the Cosmic Microwave Background assuming a LCDM universe (Planck Collaboration et al. 2018)., 15 pages, 5 figures, updated to match accepted version

Published
2019
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3. Weak-lensing analysis of SPT-selected galaxy clusters using Dark Energy Survey Science Verification data

Author

F. J. Castander, R. C. Smith, Donnacha Kirk, Alistair R. Walker, Michael Schubnell, Juan Garcia-Bellido, T. M. C. Abbott, Tim Schrabback, Christian L. Reichardt, E. J. Sanchez, Rafe Schindler, D. L. Burke, Robert A. Gruendl, Marcos Lima, Joe Zuntz, M. Carrasco Kind, David J. Brooks, Shantanu Desai, J. Carretero, Tesla E. Jeltema, Bradford Benson, D. Applegate, C. Stern, Sebastian Bocquet, David Rapetti, J. De Vicente, I-Non Chiu, A. Carnero Rosell, Ofer Lahav, Sarah Bridle, Flavia Sobreira, Enrique Gaztanaga, G. Gutierrez, Michael Troxel, Erin Sheldon, D. L. Hollowood, Santiago Avila, M. E. C. Swanson, Nikhel Gupta, M. A. G. Maia, J. P. Dietrich, Filipe B. Abdalla, Felipe Menanteau, Joshua A. Frieman, C. B. D'Andrea, Kyler Kuehn, Gregory Tarle, I. Sevilla-Noarbe, M. March, N. Kuropatkin, Matt J. Jarvis, Pablo Fosalba, T. Kacprzak, L. N. da Costa, E. Suchyta, August E. Evrard, Peter Melchior, R. Capasso, Joseph J. Mohr, A. Saro, Juan Estrada, B. Flaugher, Peter Doel, A. A. Plazas, H. T. Diehl, E. Bertin, C. Davis, J. Gschwend, A. K. Romer, M. Smith, Daniel Gruen, Ramon Miquel, Benjamin Saliwanchik, Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DES, SPT, Institut d'Astrophysique de Paris ( IAP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Stern, C., Dietrich, J. P., Bocquet, S., Applegate, D., Mohr, J. J., Bridle, S. L., Carrasco Kind, M., Gruen, D., Jarvis, M., Kacprzak, T., Saro, A., Sheldon, E., Troxel, M. A., Zuntz, J., Benson, B. A., Capasso, R., Chiu, I., Desai, S., Rapetti, D., Reichardt, C. L., Saliwanchik, Schrabback, T., Gupta, N., Abbott, T. M. C., Abdalla, F. B., Avila, S., Bertin, E., Brooks, D., Burke, D. L., Carnero Rosell, A., Carretero, J., Castander, F. J., D'Andrea, C. B., da Costa, L. N., Davis, C., De Vicente, J., Diehl, H. T., Doel, P., Estrada, J., Evrard, A. E., Flaugher, B., Fosalba, P., Frieman, J., García-Bellido, J., Gaztanaga, E., Gruendl, R. A., Gschwend, J., Gutierrez, G., Hollowood, D., Jeltema, T., Kirk, D., Kuehn, K., Kuropatkin, N., Lahav, O., Lima, M., Maia, M. A. G., March, M., Melchior, P., Menanteau, F., Miquel, R., Plazas, A. A., Romer, A. K., Sanchez, E., Schindler, R., Schubnell, M., Sevilla-Noarbe, I., Smith, M., Smith, R. C., Sobreira, F., Suchyta, E., Swanson, M. E. C., Tarle, G., Walker, A. R., Des, Collaboration, and Spt, Collaboration

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Cosmology, gravitational lensing: weak, weak [gravitational lensing], 0103 physical sciences, clusters: general [galaxies], LENTES GRAVITACIONAIS, 010303 astronomy & astrophysics, Weak gravitational lensing, Galaxy cluster, Physics, 010308 nuclear & particles physics, GALÁXIAS, Astronomy and Astrophysics, observations [cosmology], Redshift, South Pole Telescope, True mass, galaxies: clusters: general, Space and Planetary Science, cosmology: observations, Astrophysics - Cosmology and Nongalactic Astrophysics, Log-normal distribution, astro-ph.CO, Dark energy, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], observation [cosmology]
Abstract

We present weak lensing (WL) mass constraints for a sample of massive galaxy clusters detected by the South Pole Telescope (SPT) via the Sunyaev-Zeldovich effect (SZE). We use $griz$ imaging data obtained from the Science Verification (SV) phase of the Dark Energy Survey (DES) to fit the WL shear signal of 33 clusters in the redshift range $0.25 \le z \le 0.8$ with NFW profiles and to constrain a four-parameter SPT mass-observable relation. To account for biases in WL masses, we introduce a WL mass to true mass scaling relation described by a mean bias and an intrinsic, log-normal scatter. We allow for correlated scatter within the WL and SZE mass-observable relations and use simulations to constrain priors on nuisance parameters related to bias and scatter from WL. We constrain the normalization of the $\zeta-M_{500}$ relation, $A_\mathrm{SZ}=12.0_{-6.7}^{+2.6}$ when using a prior on the mass slope $B_\mathrm{SZ}$ from the latest SPT cluster cosmology analysis. Without this prior, we recover $A_\mathrm{SZ}=10.8_{-5.2}^{+2.3}$ and $B_\mathrm{SZ}=1.30_{-0.44}^{+0.22}$. Results in both cases imply lower cluster masses than measured in previous work with and without WL, although the uncertainties are large. The WL derived value of $B_\mathrm{SZ}$ is $\approx 20\%$ lower than the value preferred by the most recent SPT cluster cosmology analysis. The method demonstrated in this work is designed to constrain cluster masses and cosmological parameters simultaneously and will form the basis for subsequent studies that employ the full SPT cluster sample together with the DES data., Comment: Revised version in response to referee report

Published
2019
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4. Measuring linear and non-linear galaxy bias using counts-in-cells in the Dark Energy Survey Science Verification data

Author

Flavia Sobreira, Alistair R. Walker, D. L. Hollowood, Gruendl, R, A, Marcelle Soares-Santos, M. Smith, Sánchez, F, J, Santiago Avila, Carlos E. Cunha, H. T. Diehl, Rafe Schindler, Daniel Gruen, A. Pujol, Marcos Lima, M. March, Jennifer L. Marshall, A. E. Evrard, M. E.C. Swanson, I. Sevilla-Noarbe, David Brooks, Ofer Lahav, W. G. Hartley, A. I. Salvador, N. Kuropatkin, Juan Garcia-Bellido, E. Bertin, F. J. Castander, Ramon Miquel, P. Doel, T. M. C. Abbott, A. Roodman, J. Annis, J. De Vicente, David J. James, J. Carretero, Ashley J. Ross, E. J. Sanchez, Vikram, Pablo Fosalba, A. Carnero Rosell, Felipe Menanteau, G. Gutierrez, M. Carrasco Kind, Daniel Thomas, J. Gschwend, Gregory Tarle, Kyler Kuehn, Enrique Gaztanaga, A Pagul, E. Suchyta, Joshua A. Frieman, Scarpine, A. K. Romer, D. L. Burke, S. Allam, Département d'Astrophysique (ex SAP) (DAP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DES, Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), and Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Large-scale structure of Universe, Cosmological parameters, Dark matter, Cosmic microwave background, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Dark energy, 0103 physical sciences, cosmological parameters, observations [Cosmology], dark energy, Cluster analysis, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), 010303 astronomy & astrophysics, STFC, ComputingMilieux_MISCELLANEOUS, QC, Physics, 010308 nuclear & particles physics, RCUK, Astronomy and Astrophysics, Galaxy, Redshift, Nonlinear system, Density distribution, Space and Planetary Science, cosmology: observations, ESTRUTURA DO UNIVERSO, large-scale structure of Universe, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Non-linear bias measurements require a great level of control of potential systematic effects in galaxy redshift surveys. Our goal is to demonstrate the viability of using Counts-in-Cells (CiC), a statistical measure of the galaxy distribution, as a competitive method to determine linear and higher-order galaxy bias and assess clustering systematics. We measure the galaxy bias by comparing the first four moments of the galaxy density distribution with those of the dark matter distribution. We use data from the MICE simulation to evaluate the performance of this method, and subsequently perform measurements on the public Science Verification (SV) data from the Dark Energy Survey (DES). We find that the linear bias obtained with CiC is consistent with measurements of the bias performed using galaxy-galaxy clustering, galaxy-galaxy lensing, CMB lensing, and shear+clustering measurements. Furthermore, we compute the projected (2D) non-linear bias using the expansion $\delta_{g} = \sum_{k=0}^{3} (b_{k}/k!) \delta^{k}$, finding a non-zero value for $b_2$ at the $3\sigma$ level. We also check a non-local bias model and show that the linear bias measurements are robust to the addition of new parameters. We compare our 2D results to the 3D prediction and find compatibility in the large scale regime ($>30$ Mpc $h^{-1}$), Comment: Accepted for publication in MNRAS

Published
2018
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5. The STRong lensing Insights into the Dark Energy Survey (STRIDES) 2016 follow-up campaign – I. Overview and classification of candidates selected by two techniques

Author

R. C. Smith, David J. James, Pablo Fosalba, V. Scarpine, Christopher D. Fassnacht, E. Suchyta, Filipe B. Abdalla, K. Rojas, Michael Schubnell, P. R. Sivakumar, Geoff C. F. Chen, J. Carretero, Daniel A. Goldstein, Y. J. Kim, P. Williams, Paul L. Schechter, Richard G. McMahon, David Brooks, M. E. C. Swanson, K. Honscheid, M. Carrasco Kind, Flavia Sobreira, C. Lemon, C. B. D'Andrea, J. H.H. Chan, Brian Nord, Juan Garcia-Bellido, Adriano Agnello, Alistair R. Walker, F. Ostrovski, Santiago Avila, Philip J. Marshall, Matthew W. Auger, Louis E. Abramson, Marcelle Soares-Santos, A. Carnero Rosell, Peter Doel, Timo Anguita, J. Annis, Tim Eifler, Cristian E. Rusu, G. Meylan, Ramon Miquel, Felipe Menanteau, B. Flaugher, R. H. Schindler, J. De Vicente, Thomas E. Collett, G. Gutierrez, Gregory Tarle, Yordanka Apostolovski, M. Baumer, Marcio A. G. Maia, F. J. Castander, Nikolay Kuropatkin, Daniel Thomas, E. Buckley-Geer, M. Smith, Daniel Gruen, A. K. Romer, Simon Birrer, Paul Martini, T. M. C. Abbott, Veronica Motta, W. G. Hartley, E. J. Sanchez, Huan Lin, Frederic Courbin, Sherry H. Suyu, A. A. Plazas, D. L. Hollowood, S. Allam, Robert A. Gruendl, Marcos Lima, J. W. Hsueh, M. Banerji, Joshua A. Frieman, I. Sevilla-Noarbe, Tommaso Treu, Douglas L. Tucker, Kyler Kuehn, L. N. da Costa, UAM. Departamento de Física Teórica, Lemon, Cameron [0000-0003-2456-9317], McMahon, Richard [0000-0001-8447-8869], Banerji, Manda [0000-0002-0639-5141], and Apollo - University of Cambridge Repository

Subjects
Time delays, Cosmology and Nongalactic Astrophysics (astro-ph.CO), gravitationally lensed quasars, astro-ph.GA, statistical [methods], Dark matter, time-delay cosmography, internal structure, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astronomy & Astrophysics, 01 natural sciences, matter substructure, law.invention, hubble constant, Affordable and Clean Energy, law, 0103 physical sciences, he 0435-1223, digital-sky-survey, early-type galaxies, luminosity function, Astronomical And Space Sciences, 010303 astronomy & astrophysics, STFC, catalogues, QB, Physics, methods: statistical, 010308 nuclear & particles physics, pg 1115+080, RCUK, Física, gravitational lensing: strong, Astronomy, Astronomy and Astrophysics, Quasar, Astrophysics - Astrophysics of Galaxies, Galaxy, Data set, Lens (optics), Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), strong [gravitational lensing], Outlier, astro-ph.CO, Dark energy, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

The primary goals of the STRong lensing Insights into the Dark Energy Survey (STRIDES) collaboration are to measure the dark energy equation of state parameter and the free streaming length of dark matter. To this aim, STRIDES is discovering strongly lensed quasars in the imaging data of the Dark Energy Survey and following them up to measure time delays, high resolution imaging, and spectroscopy sufficient to construct accurate lens models. In this paper, we first present forecasts for STRIDES. Then, we describe the STRIDES classification scheme, and give an overview of the Fall 2016 follow-up campaign. We continue by detailing the results of two selection methods, the outlier selection technique and a morphological algorithm, and presenting lens models of a system that could possibly be a lensed quasar in an unusual configuration. We conclude with the summary statistics of the Fall 2016 campaign. Including searches presented in companion papers (Anguita et al.; Ostrovski et al.), STRIDES followed up 117 targets identifying 7 new strongly lensed systems, and 7 nearly identical quasars, which could be confirmed as lenses by the detection of the lens galaxy. 76 candidates were rejected and 27 remain otherwise inconclusive, for a success rate in the range of 6-35 per cent. This rate is comparable to that of previous searches like SDSS Quasar Lens Search even though the parent data set of STRIDES is purely photometric and our selection of candidates cannot rely on spectroscopic information., TT and VM acknowledge support by the David and Lucille Packard Foundation through a Packard Research Fellowship to TT. TT acknowledges support by the National Science Foundation through grants AST- 1450141 and AST-1714953. CDF and GCFC acknowledge support from the National Science Foundation through grants AST-1312329 and AST-1715611. TA and YA acknowledge support by proyecto FONDECYT 11130630 and by the Ministry for the Economy, Development, and Tourism’s Programa Inicativa Científica Milenio through grant IC 12009, awarded to The Millennium Institute of Astrophysics (MAS). FC, VB, and JC acknowledge support from the Swiss National Science Foundation. SHS thanks the Max Planck Society for support through the Max Planck Research Group

Published
2018
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6. Dark Energy Survey Year 1 Results: redshift distributions of the weak-lensing source galaxies

Author

A. Benoit-Lévy, Tenglin Li, Chihway Chang, Filipe B. Abdalla, A. L. King, R. C. Smith, Matthew R. Becker, Flavia Sobreira, Peter Doel, R. C. Wolf, M. D. Johnson, D. L. Burke, A. Roodman, Tommaso Giannantonio, D. Mudd, Edward Macaulay, C. Davis, Enrique Fernández, T. N. Varga, H. T. Diehl, Jochen Weller, F. J. Castander, A. A. Plazas, M. T. Busha, T. M. C. Abbott, E. J. Sanchez, Matt J. Jarvis, K. Honscheid, Martin Crocce, E. Suchyta, S. Allam, Robert A. Gruendl, August E. Evrard, S. A. Uddin, Diego Capozzi, Niall MacCrann, M. March, Basilio X. Santiago, Geraint F. Lewis, M. A. G. Maia, C. Bonnett, Alex Drlica-Wagner, P. Vielzeuf, Ofer Lahav, Tim Eifler, Daniela Carollo, Daniel Gruen, B. Flaugher, Donnacha Kirk, M. E. C. Swanson, M. Gatti, J. K. Hoormann, Erin Sheldon, David Brooks, A. Carnero Rosell, J. Gschwend, Gary Bernstein, Risa H. Wechsler, Michael Troxel, Huan Lin, W. C. Wester, David J. James, I. Sevilla-Noarbe, Felipe Menanteau, J. Annis, J. DeRose, D. W. Gerdes, Alistair R. Walker, A. K. Romer, J. Prat, Samuel Hinton, Douglas L. Tucker, N. Kuropatkin, Gregory Tarle, M. Childress, Kyler Kuehn, Paul Martini, J. Carretero, Ashley J. Ross, Tesla E. Jeltema, Eli S. Rykoff, A. G. Kim, Pablo Fosalba, Tamara M. Davis, G. Gutierrez, Marcelle Soares-Santos, Daniel A. Goldstein, Jacobo Asorey, J. De Vicente, Darren L. DePoy, L. N. da Costa, Daniel B. Thomas, Jennifer L. Marshall, Brad E. Tucker, R. P. Rollins, Elisabeth Krause, Anais Möller, E. Bertin, C. B. D'Andrea, Masao Sako, Rafe Schindler, Rob Sharp, S. E. Kuhlmann, Markus Michael Rau, W. G. Hartley, Bonnie Zhang, Karl Glazebrook, M. S. Schubnell, Keith Bechtol, Peter Melchior, Fang Yuan, Brian Nord, N. E. Sommer, Brian Yanny, Shantanu Desai, C. Lidman, Joshua A. Frieman, R. Cawthon, Juan Garcia-Bellido, Eduardo Rozo, Ramon Miquel, S. Samuroff, M. Carrasco Kind, Mathew Smith, Robert C. Nichol, C. Sánchez, Marcos Lima, E. Buckley-Geer, A. Alarcon, Ricardo L. C. Ogando, Juan Estrada, Enrique Gaztanaga, Ben Hoyle, Marvin Johnson, C. R. O'Neill, J. Zuntz, Vinu Vikram, V. Scarpine, Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DES, Institut d'Astrophysique de Paris ( IAP ), and Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Dark matter, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Photometry (optics), surveys, 0103 physical sciences, 010303 astronomy & astrophysics, STFC, Astrophysics::Galaxy Astrophysics, catalogues, Weak gravitational lensing, QB, Physics, 010308 nuclear & particles physics, RCUK, Astronomy, Astronomy and Astrophysics, Redshift survey, methods: data analysis, Redshift, Galaxy, Gravitational lens, Space and Planetary Science, Dark energy, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We describe the derivation and validation of redshift distribution estimates and their uncertainties for the galaxies used as weak lensing sources in the Dark Energy Survey (DES) Year 1 cosmological analyses. The Bayesian Photometric Redshift (BPZ) code is used to assign galaxies to four redshift bins between z=0.2 and 1.3, and to produce initial estimates of the lensing-weighted redshift distributions $n^i_{PZ}(z)$ for bin i. Accurate determination of cosmological parameters depends critically on knowledge of $n^i$ but is insensitive to bin assignments or redshift errors for individual galaxies. The cosmological analyses allow for shifts $n^i(z)=n^i_{PZ}(z-\Delta z^i)$ to correct the mean redshift of $n^i(z)$ for biases in $n^i_{\rm PZ}$. The $\Delta z^i$ are constrained by comparison of independently estimated 30-band photometric redshifts of galaxies in the COSMOS field to BPZ estimates made from the DES griz fluxes, for a sample matched in fluxes, pre-seeing size, and lensing weight to the DES weak-lensing sources. In companion papers, the $\Delta z^i$ are further constrained by the angular clustering of the source galaxies around red galaxies with secure photometric redshifts at 0.15, Comment: MNRAS accepted; 20 pages, 8 figures

Published
2018
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7. UV-luminous, star-forming hosts of z ∼ 2 reddened quasars in the Dark Energy Survey

Author

David J. James, Pablo Fosalba, V. Scarpine, A. Benoit-Lévy, R. C. Smith, J. Gschwend, J. Carretero, M. Carrasco-Kind, Flavia Sobreira, G. Gutierrez, Shantanu Desai, S. L. Reed, Paul C. Hewett, Richard G. McMahon, David Brooks, Daniel Gruen, Brian Nord, M. Banerji, Joshua A. Frieman, Peter Doel, A. K. Romer, Juan Garcia-Bellido, Jennifer L. Marshall, E. J. Sanchez, Robert A. Gruendl, E. Buckley-Geer, Paul Martini, E. Suchyta, F. B. Abdalla, D. W. Gerdes, B. Flaugher, Alistair R. Walker, Ramon Miquel, Marcelle Soares-Santos, Carlos E. Cunha, Robert C. Nichol, Rafe Schindler, Kyler Kuehn, C. F. Wethers, Tesla E. Jeltema, Matthew Smith, Marcos Lima, I. Sevilla-Noarbe, N. Kuropatkin, L. N. da Costa, M. A. G. Maia, A. A. Plazas, K. Honscheid, C. Lemon, C. B. D'Andrea, Diego Capozzi, S. E. Kuhlmann, Michael Schubnell, Darren L. DePoy, A. Carnero Rosell, Yue Shen, Felipe Menanteau, Gregory Tarle, Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DES, Banerji, Manda [0000-0002-0639-5141], Hewett, Paul [0000-0002-6528-1937], Lemon, Cameron [0000-0003-2456-9317], McMahon, Richard [0000-0001-8447-8869], and Apollo - University of Cambridge Repository

Subjects
Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Photometry (optics), galaxies: high-redshift, quasars: general, 0103 physical sciences, Galaxy formation and evolution, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, STFC, Astrophysics::Galaxy Astrophysics, QB, Physics, 010308 nuclear & particles physics, Star formation, RCUK, Astronomy and Astrophysics, Quasar, Astrophysics - Astrophysics of Galaxies, Galaxy, Wavelength, 13. Climate action, Space and Planetary Science, galaxies: star formation, Astrophysics of Galaxies (astro-ph.GA), ultraviolet: galaxies, Dark energy, Spectral energy distribution, Astrophysics::Earth and Planetary Astrophysics, galaxies: evolution, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

We present the first rest-frame UV population study of 17 heavily reddened, high-luminosity (E(B-V)$_{\rm{QSO}}\gtrsim$ 0.5; L$_{\rm{bol}}>$ 10$^{46}$ergs$^{-1}$) broad-line quasars at $1.5 < z < 2.7$. We combine the first year of deep, optical, ground-based observations from the Dark Energy Survey (DES) with the near infrared VISTA Hemisphere Survey (VHS) and UKIDSS Large Area Survey (ULAS) data, from which the reddened quasars were initially identified. We demonstrate that the significant dust reddening towards the quasar in our sample allows host galaxy emission to be detected at the rest-frame UV wavelengths probed by the DES photometry. By exploiting this reddening effect, we disentangle the quasar emission from that of the host galaxy via spectral energy distribution (SED) fitting. We find evidence for a relatively unobscured, star-forming host galaxy in at least ten quasars, with a further three quasars exhibiting emission consistent with either star formation or scattered light. From the rest-frame UV emission, we derive instantaneous, dust-corrected star formation rates (SFRs) in the range 25 < SFR$_{\rm{UV}}$ < 365 M$_{\odot}$yr$^{-1}$, with an average SFR$_{\rm{UV}}$ = 130 $\pm$ 95 M$_{\odot}$yr$^{-1}$. We find a broad correlation between SFR$_{\rm{UV}}$ and the bolometric quasar luminosity. Overall, our results show evidence for coeval star formation and black hole accretion occurring in luminous, reddened quasars at the peak epoch of galaxy formation., 21 pages, 8 figures, MNRAS Accepted

Published
2018
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8. Withdrawn as Duplicate: Survey geometry and the internal consistency of recent cosmic shear measurements

Author

V. Scarpine, N. MacCrann, J. Prat, R. L. C. Ogando, Martin Crocce, G. Gutierrez, A. Carnero Rosell, Erin Sheldon, Elisabeth Krause, A. Chen, W. G. Hartley, David J. Brooks, A. A. Plazas, K. Honscheid, Alistair R. Walker, Marcelle Soares-Santos, S. Samuroff, David J. James, Daniel Gruen, J. Carretero, Joshua A. Frieman, J. De Vicente, K. Kuehn, Felipe Menanteau, D. W. Gerdes, Flavia Sobreira, E. Suchyta, August E. Evrard, Juan Garcia-Bellido, Dragan Huterer, J. Zuntz, Marcos Lima, M. Gatti, J. Annis, M. E. C. Swanson, M. Carrasco Kind, O. Lahav, P. Fosalba, I. Sevilla-Noarbe, N. Kuropatkin, L. N. da Costa, Matt J. Jarvis, F. Lacasa, Ramon Miquel, M. March, P. Vielzeuf, Ben Hoyle, Joseph J. Mohr, Risa H. Wechsler, Salcedo Romero de Ávila, B. Flaugher, Carles Sanchez, Enrique Gaztanaga, M. N. K. Smith, A. Roodman, Daniel B. Thomas, D. L. Hollowood, H. T. Diehl, C. L. Davis, Michael Troxel, P. Doel, M. H.L.S. Wang, C. B. D'Andrea, E. Bertin, T. F. Eifler, R. H. Schindler, F. B. Abdalla, J. DeRose, D. Kirk, J. Gschwend, E. J. Sanchez, Tenglin Li, Scott Dodelson, Carlos E. Cunha, Oliver Friedrich, H. V. Peiris, P. Lemos, D. L. Burke, S. Allam, Robert A. Gruendl, and C. L. Chang

Subjects
Physics, COSMIC cancer database, Shear (geology), Space and Planetary Science, Internal consistency, Astronomy and Astrophysics, Mechanics, Astrophysics
Published
2018
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9. Estimating the redshift distribution of photometric galaxy samples

Author

Joshua A. Frieman, Hiroaki Oyaizu, Erin Sheldon, Marcos Lima, Carlos E. Cunha, and Huan Lin

Subjects
Physics, 010308 nuclear & particles physics, media_common.quotation_subject, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Stability (probability), Galaxy, Redshift, Weighting, Space and Planetary Science, Sky, 0103 physical sciences, Dark energy, Range (statistics), Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Photometric redshift, media_common
Abstract

We present an empirical method for estimating the underlying redshift distribution N(z) of galaxy photometric samples from photometric observables. The method does not rely on photometric redshift (photo-z) estimates for individual galaxies, which typically suffer from biases. Instead, it assigns weights to galaxies in a spectroscopic subsample such that the weighted distributions of photometric observables (e.g., multi-band magnitudes) match the corresponding distributions for the photometric sample. The weights are estimated using a nearest-neighbor technique that ensures stability in sparsely populated regions of color-magnitude space. The derived weights are then summed in redshift bins to create the redshift distribution. We apply this weighting technique to data from the Sloan Digital Sky Survey as well as to mock catalogs for the Dark Energy Survey, and compare the results to those from the estimation of photo-z's derived by a neural network algorithm. We find that the weighting method accurately recovers the underlying redshift distribution, typically better than the photo-z reconstruction, provided the spectroscopic subsample spans the range of photometric observables covered by the photometric sample.

Published
2008
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10. Weak gravitational lensing by voids

Author

Luca Amendola, Joshua A. Frieman, and Ioav Waga

Subjects
Physics, Distribution (mathematics), Space and Planetary Science, Distortion, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Cosmic variance, Astrophysics, Limit (mathematics), Weak gravitational lensing
Abstract

We consider the prospects for detecting weak gravitational lensing by underdensities (voids) in the large-scale matter distribution. We derive the basic expressions for magnification and distortion by spherical voids. Clustering of the background sources and cosmic variance are the main factors which limit in principle the detection of lensing by voids. We conclude that only voids with radii larger than $\sim 100$ \hm have lensing signal to noise larger than unity., Comment: 12 pages, 7 figures, uses mn-1_4.sty file, submitted to MNRAS

Published
1999
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11. Erratum: Baryon acoustic oscillations in the Sloan Digital Sky Survey Data Release 7 galaxy sample

Author

Neta A. Bahcall, Joshua A. Frieman, Idit Zehavi, Jon Loveday, Avery Meiksin, David H. Weinberg, Max Tegmark, Gillian R. Knapp, Robert H. Lupton, Beth Reid, David N. Spergel, Alexander S. Szalay, Donald G. York, Richard G. Kron, Michael A. Strauss, Tamás Budavári, James E. Gunn, Michael S. Vogeley, Daniel J. Eisenstein, Timothy A. McKay, Chris Stoughton, Donald P. Schneider, Will J. Percival, Zeljko Ivezic, Robert C. Nichol, David J. Schlegel, Masataka Fukugita, and Adrian Pope

Subjects
Physics, Length scale, media_common.quotation_subject, Spectral density, Astronomy, Astronomy and Astrophysics, Astrophysics, Sample (graphics), Galaxy, Space and Planetary Science, Sky, Survey data collection, Baryon acoustic oscillations, media_common
Published
2011
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12. Erratum: Cosmological constraints from the clustering of the Sloan Digital Sky Survey DR7 luminous red galaxies

Author

Chris Stoughton, Adrian Pope, Tamás Budavári, Michael S. Vogeley, Avery Meiksin, David N. Spergel, Gillian R. Knapp, Licia Verde, Beth Reid, Zeljko Ivezic, Neta A. Bahcall, Robert H. Lupton, Ramin A. Skibba, Michael A. Strauss, David H. Weinberg, Richard G. Kron, Daniel J. Eisenstein, Will J. Percival, J. Richard Gott, Robert C. Nichol, Timothy A. McKay, Alexander S. Szalay, Donald G. York, Idit Zehavi, Joshua A. Frieman, Max Tegmark, Masataka Fukugita, David J. Schlegel, Donald P. Schneider, and James E. Gunn

Subjects
Luminous infrared galaxy, Physics, media_common.quotation_subject, Astronomy, Spectral density, Astronomy and Astrophysics, Astrophysics, Sample (graphics), Galaxy, Space and Planetary Science, Sky, Galaxy group, Cluster analysis, media_common
Published
2011
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