DISCOVERY OF NINE INTERMEDIATE-REDSHIFT COMPACT QUIESCENT GALAXIES IN THE SLOAN DIGITAL SKY SURVEY

被引：17
作者：
Damjanov, Ivana [1 ]
Chilingarian, Igor [2 ,3 ]
Hwang, Ho Seong [2 ]
Geller, Margaret J. [2 ]
机构：
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Smithsonian Astrophys Observ, Cambridge, MA 02138 USA
[3] Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow 119992, Russia
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2013年 / 775卷 / 02期
基金：
加拿大自然科学与工程研究理事会;
关键词：
galaxies: evolution; galaxies: fundamental parameters; galaxies: stellar content; galaxies: structure; SUPERDENSE MASSIVE GALAXIES; NEARBY ELLIPTIC GALAXIES; SIMILAR-TO; SIZE EVOLUTION; STAR-FORMATION; PASSIVE GALAXIES; RED NUGGETS; Z-SIMILAR-TO-2.5; SPECTROSCOPY; HISTORIES;
D O I：
10.1088/2041-8205/775/2/L48
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We identify nine galaxies with dynamical masses of M-dyn greater than or similar to 10(10) M-circle dot as photometric point sources, but with redshifts between z = 0.2 and z = 0.6, in the Sloan Digital Sky Survey (SDSS) spectro-photometric database. All nine galaxies have archival Hubble Space Telescope images. Surface brightness profile fitting confirms that all nine galaxies are extremely compact (0.4 < R-e,R-c < 6.6 kpc with the median R-e,R-c = 0.74 kpc) for their velocity dispersion (110 < sigma < 340 km s(-1); median sigma = 178 km s(-1)). From the SDSS spectra, three systems are dominated by very young stars; the other six are older than similar to 1 Gyr (two are E+A galaxies). The three young galaxies have disturbed morphologies and the older systems have smooth profiles consistent with a single-Sersic function. All nine lie below the z similar to 0 velocity dispersion-half-light radius relation. The most massive system-SDSSJ123657.44+631115.4-lies right within the locus for massive compact z > 1 galaxies and the other eight objects follow the high-redshift dynamical size-mass relation.
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