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Author
dc.contributor.author
Bernardi, M 
Author
dc.contributor.author
Sheth, R K 
Author
dc.contributor.author
Annis, J 
Author
dc.contributor.author
Burles, S 
Author
dc.contributor.author
Finkbeiner, D P 
Author
dc.contributor.author
Lupton, R H 
Author
dc.contributor.author
Schlegel, D J 
Author
dc.contributor.author
Subbarao, M 
Author
dc.contributor.author
Bahcall, N A 
Author
dc.contributor.author
Blakeslee, J P 
Availability Date
dc.date.accessioned
2020-08-08T20:16:43Z
Availability Date
dc.date.available
2020-08-08T20:16:43Z
Release
dc.date.issued
2003
uri
dc.identifier.uri
http://hdl.handle.net/10831/49221
Abstract
dc.description.abstract
The colors and chemical abundances of early-type galaxies at redshifts z < 0.3 are studied using a sample of nearly 9000 galaxies, selected from the Sloan Digital Sky Survey using morphological and spectral criteria. In this sample, redder galaxies have larger velocity dispersions: g*-r* proportional to sigma(0.26+/-0.02). Color also correlates with magnitude, g* - r* proportional to (-0.025+/-0.003) Mr(*), and size, but these correlations are entirely due to the L-sigma and R-o-sigma relations: the primary correlation is color-sigma. The red light in early-type galaxies is, on average, slightly more centrally concentrated than the blue. Because of these color gradients, the strength of the color-magnitude relation depends on whether or not the colors are defined using a fixed metric aperture; the color-sigma relation is less sensitive to this choice. Chemical evolution and star formation histories of early-type galaxies are investigated using co-added spectra of similar objects. The resulting library of co-added spectra contains spectra that represent a wide range of early-type galaxies. Chemical abundances correlate primarily with velocity dispersion: H beta proportional to sigma(-0.24+/-0.03), Mg-2 proportional to sigma(0.20+/-0.02), Mg b proportional to sigma(0.32+/-0.03), and [Fe] proportional to sigma(0.11+/-0.03). At fixed sigma, the population at z similar to 0.2 had weaker Mg-2 and stronger H beta absorption compared to the population at z similar to 0. It was also bluer. Comparison of these colors and line strengths and their evolution with single-burst stellar population models suggests a formation time of 9 Gyr ago, consistent with a fundamental plane analysis of this sample. Although the fundamental plane shows that galaxies in dense regions are slightly different from galaxies in less dense regions, the co-added spectra and color-magnitude relations show no statistically significant dependence on environment.
Language
dc.language
Angol
Title
dc.title
Early-type galaxies in the Sloan Digital Sky Survey. IV. Colors and chemical evolution
Type
dc.type
folyóiratcikk
Date Change
dc.date.updated
2020-06-05T11:52:57Z
Scope
dc.format.page
1882-1896
Doi ID
dc.identifier.doi
10.1086/367795
Wos ID
dc.identifier.wos
000181713100019
ID Scopus
dc.identifier.scopus
0042260828
MTMT ID
dc.identifier.mtmt
1064355
Issue Number
dc.identifier.issue
4
abbreviated journal
dc.identifier.jabbrev
ASTRON J
Journal
dc.identifier.jtitle
ASTRONOMICAL JOURNAL
Volume Number
dc.identifier.volume
125
Release Date
dc.description.issuedate
2003
department of Author
dc.contributor.institution
Komplex Rendszerek Fizikája Tanszék
Author institution
dc.contributor.department
Komplex Rendszerek Fizikája Tanszék


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Early-type galaxies in the Sloan Digital Sky Survey. IV. Colors and chemical evolution
 

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