Search

Your search keyword '"Eifler, Tim"' showing total 161 results
Start Over Author "Eifler, Tim"
161 results on '"Eifler, Tim"'

152. The impact of intrinsic alignment on current and future cosmic shear surveys.

Author

Krause, Elisabeth, Eifler, Tim, and Blazek, Jonathan

Subjects
*METAPHYSICAL cosmology, *SHEAR (Mechanics), *FISHER information, *ANALYSIS of covariance, *REDSHIFT, *STELLAR luminosity function, *DARK energy
Abstract

Intrinsic alignment (IA) of source galaxies is one of the major astrophysical systematics for weak lensing surveys. Several IA models have been proposed and their impact on cosmological constraints has been examined using the Fisher information matrix in conjunction with approximate, Gaussian covariances. This paper presents the first forecasts of the impact of IA on cosmic shear measurements for future surveys using simulated likelihood analyses and covariances that include higher order moments of the density field. We consider a range of possible IA scenarios and test mitigation schemes which parametrize IA by the fraction of red galaxies, normalization, luminosity and redshift dependence of the IA signal. Compared to previous studies, we find smaller biases in time-dependent dark energy models if IA is ignored in the analysis. The amplitude and significance of these biases vary as a function of survey properties (depth, statistical uncertainties), luminosity function and IA scenario. Due to its small statistical errors and relatively shallow depth, Euclid is significantly impacted by IA. Large Synoptic Survey Telescope (LSST) andWide-Field Infrared Survey Telescope (WFIRST) benefit from increased survey depth, while larger statistical errors for Dark Energy Survey (DES) decrease IA's relative impact on cosmological parameters. The proposed IA mitigation scheme removes parameter biases for DES, LSST and WFIRST even if the shape of the IA power spectrum is only poorly known; successful IA mitigation for Euclid requires more prior information. We explore several alternative IA mitigation strategies for Euclid; in the absence of alignment of blue galaxies we recommend the exclusion of red (IA-contaminated) galaxies in cosmic shear analyses. [ABSTRACT FROM AUTHOR]

Published
2016
Full Text
View/download PDF

156. COSMOLOGICAL WEAK LENSING AND DARK MATTER MAPPING WITH THE HUBBLE SPACE TELESCOPE

Author

SCHRABBACK, TIM, primary, SIMON, PATRICK, additional, ERBEN, THOMAS, additional, SCHNEIDER, PETER, additional, HARTLAP, JAN, additional, HEYMANS, CATHERINE, additional, MARSHALL, PHIL, additional, HILDEBRANDT, HENDRIK, additional, FASSNACHT, CHRIS, additional, MORGANSON, ERIC, additional, BRADAČ, MARUŠA, additional, HETTERSCHEIDT, MARCO, additional, EIFLER, TIM, additional, MIRALLES, JOAN-MARC, additional, DIETRICH, JÖRG, additional, FOSBURY, ROBERT, additional, FREUDLING, WOLFRAM, additional, and PIRZKAL, NORBERT, additional

Published
2008
Full Text
View/download PDF

157. Core or cusps: The central dark matter profile of a redshift one strong lensing cluster with a bright central image

Author

Collett, Thomas E., Buckley-Geer, Elizabeth, Lin, Huan, Bacon, David, Nichol, Robert C., Nord, Brian, Morice-Atkinson, Xan, Amara, Adam, Birrer, Simon, Kuropatkin, Nikolay, More, Anupreeta, Papovich, Casey, Romer, Kathy K., Tessore, Nicolas, Abbott, Tim M. C., Allam, Sahar, Annis, James, Benoit-Lévy, Aurélien, Brooks, David, Burke, David L., Matias Carrasco Kind, Castander, Francisco Javier J., D Andrea, Chris B., Da Costa, Luiz N., Desai, Shantanu, Diehl, H. Thomas, Doel, Peter, Eifler, Tim F., Flaugher, Brenna, Frieman, Josh, Gerdes, David W., Goldstein, Daniel A., Gruen, Daniel, Gschwend, Julia, Gutierrez, Gaston, James, David J., Kuehn, Kyler, Kuhlmann, Steve, Lahav, Ofer, Li, Ting S., Lima, Marcos, Maia, Marcio A. G., March, Marisa, Marshall, Jennifer L., Martini, Paul, Melchior, Peter, Miquel, Ramon, Plazas, Andrés A., Rykoff, Eli S., Sanchez, Eusebio, Scarpine, Vic, Schindler, Rafe, Schubnell, Michael, Sevilla-Noarbe, Ignacio, Smith, Mathew, Sobreira, Flavia, Suchyta, Eric, Swanson, Molly E. C., Tarle, Gregory, Tucker, Douglas L., and Walker, Alistair R.

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - Astrophysics of Galaxies, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We report on SPT-CLJ2011-5228, a giant system of arcs created by a cluster at $z=1.06$. The arc system is notable for the presence of a bright central image. The source is a Lyman Break galaxy at $z_s=2.39$ and the mass enclosed within the 14 arc second radius Einstein ring is $10^{14.2}$ solar masses. We perform a full light profile reconstruction of the lensed images to precisely infer the parameters of the mass distribution. The brightness of the central image demands that the central total density profile of the lens be shallow. By fitting the dark matter as a generalized Navarro-Frenk-White profile---with a free parameter for the inner density slope---we find that the break radius is $270^{+48}_{-76}$ kpc, and that the inner density falls with radius to the power $-0.38\pm0.04$ at 68 percent confidence. Such a shallow profile is in strong tension with our understanding of relaxed cold dark matter halos; dark matter only simulations predict the inner density should fall as $r^{-1}$. The tension can be alleviated if this cluster is in fact a merger; a two halo model can also reconstruct the data, with both clumps (density going as $r^{-0.8}$ and $r^{-1.0}$) much more consistent with predictions from dark matter only simulations. At the resolution of our Dark Energy Survey imaging, we are unable to choose between these two models, but we make predictions for forthcoming Hubble Space Telescope imaging that will decisively distinguish between them., 13 Pages. Accepted for publication in ApJ

158. DES Science Portal: I - Computing Photometric Redshifts

Author

Gschwend, Julia, Carnero, Aurelio, Ogando, Ricardo L. C., Neto, Angelo F., Maia, Marcio A. G., Da Costa, Luiz A. N., Lima, Marcos, Pellegrini, Paulo S., Campisano, Riccardo, Singulani, Cristiano P., Souza, Carlos A., Carrasco Kind, Matias, Davis, Tamara M., Vicente, Juan, Hartley, Will, Hoyle, Ben, Palmese, Antonella, Rau, Markus, Sadeh, Iftach, Abdalla, Filipe B., Allam, Sahar, Asorey, Jacobo, Benoit-Lévy, Aurelién, Bertin, Emmanuel, Brooks, David, Buckley-Geer, Elizabeth, Carretero, Jorge, Castander, Francisco J., Cunha, Carlos, D Andrea, Chris, Depoy, Darren, Desai, Shantanu, Doel, Peter, Eifler, Tim, Evrard, August, Fosalba, Pablo, Frieman, Josh, García-Bellido, Juan, Gaztanaga, Enrique, Giannantonio, Tommaso, Glazebrook, Karl, Gruendl, Robert, Gutierrez, Gaston, Hinton, Samuel, Hoormann, Janie, James, David, King, Anthea, Kuehn, Kyler, Kuropatkin, Nikolay, Lahav, Ofer, Lewis, Geraint, Lidman, Chris, Macaulay, Edward, March, Marisa, Marshall, Jennifer, Martini, Paul, Felipe Menanteau, Miquel, Ramon, Möller, Anais, Mudd, Dale, Plazas, Andrés, Romer, Kathy, Sanchez, Eusebio, Santiago, Basilio, Scarpine, Vic, Sevilla-Noarbe, Ignacio, Sharp, Robert, Smith, Mathew, Soares-Santos, Marcelle, Sobreira, Flavia, Sommer, Natalia Eiré, Suchyta, Eric, Swanson, Molly, Tucker, Brad E., Tucker, Douglas, Uddin, Syed, Walker, Alistair, and Zhang, Bonnie R.

159. Reinvesting real estate sale profits avoids taxes.

Author

Eifler, Tim and Martin, James

Abstract

Deals with the taxation of real estate sale profits. Keys to achieving tax deferral on properties; Taxation rules for simultaneous exchange of properties of equal value; Tax law regarding the sale of a property and later purchase of another property of like kind.

Published
1998

161. Dark Energy Survey Identification of A Low-Mass Active Galactic Nucleus at Redshift 0.823 from Optical Variability

Author

Daniel Gruen, S. Everett, Marcos Lima, Colin J. Burke, K. Honscheid, Kyler Kuehn, A. Roodman, Luiz N. da Costa, D. W. Gerdes, David J. Brooks, M. Costanzi, Brad E. Tucker, Ricardo L. C. Ogando, A. K. Romer, Devon L. Hollowood, C. Lidman, E. J. Sanchez, Daniela Carollo, Peter Doel, Yu-Ching Chen, Michel Aguena, Aurelio Carnero Rosell, Emmanuel Bertin, E. Suchyta, Enrique Gaztanaga, N. E. Sommer, Juan Garcia-Bellido, Michael Schubnell, Samuel Hinton, G. Gutierrez, V. Scarpine, Eric Morganson, Juan de Vicente, Molly E. C. Swanson, Marcelle Soares-Santos, T. N. Varga, S. Allam, Robert A. Gruendl, Santiago Serrano, F. Paz-Chinchón, Anais Möller, Xin Liu, Kedar A. Phadke, Tim Eifler, Santiago Avila, A. A. Plazas, Ramon Miquel, Marcio A. G. Maia, J. Gschwend, Felipe Menanteau, Kaiwen Zhang, Matias Carrasco Kind, David J. James, Gregory Tarle, Hengxiao Guo, Shantanu Desai, Yue Shen, Mathew Smith, Antonella Palmese, 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), Laboratoire de Physique de Clermont (LPC), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), DES, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Guo, Hengxiao, Burke, Colin J., Liu, Xin, Phadke, Kedar A., Zhang, Kaiwen, Chen, Yu-Ching, Gruendl, Robert A., Lidman, Christopher, Shen, Yue, Morganson, Eric, Aguena, Michel, Allam, Sahar, Avila, Santiago, Bertin, Emmanuel, Brooks, David, Rosell, Aurelio Carnero, Carollo, Daniela, Kind, Matias Carrasco, Costanzi, Matteo, da Costa, Luiz N., De Vicente, Juan, Desai, Shantanu, Doel, Peter, Eifler, Tim F., Everett, Spencer, García-Bellido, Juan, Gaztanaga, Enrique, Gerdes, David W., Gruen, Daniel, Gschwend, Julia, Gutierrez, Gaston, Hinton, Samuel R., Hollowood, Devon L., Honscheid, Klau, James, David J., Kuehn, Kyler, Lima, Marco, Maia, Marcio A. G., Menanteau, Felipe, Miquel, Ramon, Möller, Anai, Ogando, Ricardo L. C., Palmese, Antonella, Paz-Chinchón, Francisco, Plazas, Andrés A., Romer, Anita K., Roodman, Aaron, Sanchez, Eusebio, Scarpine, Vic, Schubnell, Michael, Serrano, Santiago, Smith, Mathew, Soares-Santos, Marcelle, Sommer, Natalia E., Suchyta, Eric, Swanson, Molly E. C., Tarle, Gregory, Tucker, Brad E., and Varga, Tamas N. (DES Collaboration)

Subjects
Active galactic nucleus, Stellar mass, Astrophysics::High Energy Astrophysical Phenomena, black hole physics, galaxies: active, nuclei [galaxies], FOS: Physical sciences, active, [galaxies], Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, surveys, galaxies: high-redshift, galaxies: nuclei, quasars: general, 01 natural sciences, Luminosity, 0103 physical sciences, survey, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Dwarf galaxy, Physics, Supermassive black hole, general [quasars], 010308 nuclear & particles physics, Astronomy and Astrophysics, Quasar, black hole physic, Astrophysics - Astrophysics of Galaxies, Redshift, Galaxy, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], high-redshift [galaxies]
Abstract

We report the identification of a low-mass AGN, DES J0218$-$0430, in a redshift $z = 0.823$ galaxy in the Dark Energy Survey (DES) Supernova field. We select DES J0218$-$0430 as an AGN candidate by characterizing its long-term optical variability alone based on DES optical broad-band light curves spanning over 6 years. An archival optical spectrum from the fourth phase of the Sloan Digital Sky Survey shows both broad Mg II and broad H$\beta$ lines, confirming its nature as a broad-line AGN. Archival XMM-Newton X-ray observations suggest an intrinsic hard X-ray luminosity of $L_{{\rm 2-12\,keV}}\sim7.6\pm0.4\times10^{43}$ erg s$^{-1}$, which exceeds those of the most X-ray luminous starburst galaxies, in support of an AGN driving the optical variability. Based on the broad H$\beta$ from SDSS spectrum, we estimate a virial BH mass of $M_{\bullet}\approx10^{6.43}$-$10^{6.72}M_{\odot}$ (with the error denoting 1$\sigma$ statistical uncertainties only), consistent with the estimation from OzDES, making it the lowest mass AGN with redshift $>$ 0.4 detected in optical. We estimate the host galaxy stellar mass to be $M_{\ast}\sim10^{10.5\pm0.3}M_{\odot}$ based on modeling the multi-wavelength spectral energy distribution. DES J0218$-$0430 extends the $M_{\bullet}$-$M_{\ast}$ relation observed in luminous AGNs at $z\sim1$ to masses lower than being probed by previous work. Our work demonstrates the feasibility of using optical variability to identify low-mass AGNs at higher redshift in deeper synoptic surveys with direct implications for the upcoming Legacy Survey of Space and Time at Vera C. Rubin Observatory., Comment: 13 pages, 8 figures, 1 table, accepted to MNRAS

Published
2020
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results