Journal
ASTROPHYSICAL JOURNAL
Volume 800, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/800/2/94
Keywords
galaxies: elliptical and lenticular, cD; galaxies: evolution; gravitational lensing: strong
Categories
Funding
- UCSB Dean Graduate Fellowship
- Centre National des Etudes Spatiales (CNES)
- U.S. Department of Energy [DE-AC02-76SF00515]
- NSF through CAREER award [NSF-0642621]
- Packard Foundation through a Packard Research Fellowship
- PRIN MIUR project The Chemical and Dynamical Evolution of the Milky Way and Local Group Galaxies [2010LY5N2T]
- ESO Telescopes at the Paranal Observatory [092.B-0663]
- NASA through Hubble Space Telescope programs [GO-10876, GO-11289, GO-11588]
- National Science Foundation [PHY99-07949]
- NASA [NAS 5-26555]
- W.M. Keck Foundation
- STFC [ST/K004182/1] Funding Source: UKRI
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We investigate the cosmic evolution of the internal structure of massive early-type galaxies over half of the age of the universe. We 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. We find 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 logM(*) = 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.
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