Witnessing the differential evolution of disk galaxies in luminosity and size via gravitational lensing

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DOIResolve DOI: http://doi.org/10.1088/0004-637X/777/1/1
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume777
Issue1
Article number1
AbstractWe take advantage of the magnification in size and flux of a galaxy provided by gravitational lensing to analyze the properties of 62 strongly lensed galaxies from the Sloan Lens ACS (SLACS) Survey. The sample of lensed galaxies spans a redshift range of 0.20 ≤ z ≤ 1.20 with a median redshift of z = 0.61. We use the lens modeling code LENSFIT to derive the luminosities, sizes, and Sérsic indices of the lensed galaxies. The measured properties of the lensed galaxies show a primarily compact, "disk"-like population with the peaks of the size and Sérsic index distributions corresponding to ∼1.50 kpc and n ∼ 1, respectively. Comparison of the SLACS galaxies to a non-lensing, broadband imaging survey shows that a lensing survey allows us to probe a galaxy population that reaches ∼2 mag fainter. Our analysis allows us to compare the 〈z〉 = 0.61 disk galaxy sample (n ≤ 2.5) to an unprecedented local galaxy sample of ∼670, 000 SDSS galaxies at z ∼ 0.1; this analysis indicates that the evolution of the luminosity-size relation since z ∼ 1 may not be fully explained by a pure-size or pure-luminosity evolution but may instead require a combination of both. Our observations are also in agreement with recent numerical simulations of disk galaxies that show evidence of a mass-dependent evolution since z ∼ 1, where high-mass disk galaxies (M * > 109 M⊙) evolve more in size and low-mass disk galaxies (M * ≤ 109 M⊙) evolve more in luminosity. © 2013. The American Astronomical Society. All rights reserved..
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); NRC Herzberg Institute of Astrophysics (HIA-IHA)
Peer reviewedYes
NPARC number21269670
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Record identifier37b39717-daa9-4f5a-bc55-8f2569d8f9c2
Record created2013-12-13
Record modified2016-07-18
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