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Title: The SL2S galaxy-scale lens sample. V. dark matter halos and stellar IMF of massive early-type galaxies out to redshift 0.8

Here, we investigate the cosmic evolution of the internal structure of massive early-type galaxies over half of the age of the universe. We also perform a joint lensing and stellar dynamics analysis of a sample of 81 strong lenses from the Strong Lensing Legacy Survey and Sloan ACS Lens Survey and combine the results with a hierarchical Bayesian inference method to measure the distribution of dark matter mass and stellar initial mass function (IMF) across the population of massive early-type galaxies. Lensing selection effects are taken into account. Furthermore, we found that the dark matter mass projected within the inner 5 kpc increases for increasing redshift, decreases for increasing stellar mass density, but is roughly constant along the evolutionary tracks of early-type galaxies. The average dark matter slope is consistent with that of a Navarro-Frenk-White profile, but is not well constrained. The stellar IMF normalization is close to a Salpeter IMF at log M * = 11.5 and scales strongly with increasing stellar mass. No dependence of the IMF on redshift or stellar mass density is detected. The anti-correlation between dark matter mass and stellar mass density supports the idea of mergers being more frequent in more massive dark mattermore » halos.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7]
  1. Univ. of California, Santa Barbara, CA (United States). Physics Dept.
  2. Univ. of California, Santa Barbara, CA (United States). Physics Dept.; Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  3. Kavli Inst. for Particle Astrophysics and Cosmology, Stanford, CA (United States)
  4. Academia Sinica, Taipei (Taiwan). Inst. of Astronomy and Astrophysics
  5. Univ. Pierre et Marie Curie, Paris (France). Inst. of Astrophysics
  6. Univ. of Cambridge (United Kingdom). Inst. of Astronomy
  7. Bologna Univ. (Italy). Dept. of Physics and Astronomy
Publication Date:
Report Number(s):
SLAC-PUB-16265
Journal ID: ISSN 1538-4357
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 800; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: elliptical and lenticular; cD; galaxies: evolution; gravitational lensing: strong
OSTI Identifier:
1336371

Sonnenfeld, Alessandro, Treu, Tommaso, Marshall, Philip J., Suyu, Sherry H., Gavazzi, Raphaël, Auger, Matthew W., and Nipoti, Carlo. The SL2S galaxy-scale lens sample. V. dark matter halos and stellar IMF of massive early-type galaxies out to redshift 0.8. United States: N. p., Web. doi:10.1088/0004-637X/800/2/94.
Sonnenfeld, Alessandro, Treu, Tommaso, Marshall, Philip J., Suyu, Sherry H., Gavazzi, Raphaël, Auger, Matthew W., & Nipoti, Carlo. The SL2S galaxy-scale lens sample. V. dark matter halos and stellar IMF of massive early-type galaxies out to redshift 0.8. United States. doi:10.1088/0004-637X/800/2/94.
Sonnenfeld, Alessandro, Treu, Tommaso, Marshall, Philip J., Suyu, Sherry H., Gavazzi, Raphaël, Auger, Matthew W., and Nipoti, Carlo. 2015. "The SL2S galaxy-scale lens sample. V. dark matter halos and stellar IMF of massive early-type galaxies out to redshift 0.8". United States. doi:10.1088/0004-637X/800/2/94. https://www.osti.gov/servlets/purl/1336371.
@article{osti_1336371,
title = {The SL2S galaxy-scale lens sample. V. dark matter halos and stellar IMF of massive early-type galaxies out to redshift 0.8},
author = {Sonnenfeld, Alessandro and Treu, Tommaso and Marshall, Philip J. and Suyu, Sherry H. and Gavazzi, Raphaël and Auger, Matthew W. and Nipoti, Carlo},
abstractNote = {Here, we investigate the cosmic evolution of the internal structure of massive early-type galaxies over half of the age of the universe. We also perform a joint lensing and stellar dynamics analysis of a sample of 81 strong lenses from the Strong Lensing Legacy Survey and Sloan ACS Lens Survey and combine the results with a hierarchical Bayesian inference method to measure the distribution of dark matter mass and stellar initial mass function (IMF) across the population of massive early-type galaxies. Lensing selection effects are taken into account. Furthermore, we found that the dark matter mass projected within the inner 5 kpc increases for increasing redshift, decreases for increasing stellar mass density, but is roughly constant along the evolutionary tracks of early-type galaxies. The average dark matter slope is consistent with that of a Navarro-Frenk-White profile, but is not well constrained. The stellar IMF normalization is close to a Salpeter IMF at log M * = 11.5 and scales strongly with increasing stellar mass. No dependence of the IMF on redshift or stellar mass density is detected. The anti-correlation between dark matter mass and stellar mass density supports the idea of mergers being more frequent in more massive dark matter halos.},
doi = {10.1088/0004-637X/800/2/94},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 800,
place = {United States},
year = {2015},
month = {2}
}