A NEARBY ANALOG OF z ∼ 2 COMPACT QUIESCENT GALAXIES WITH A ROTATING DISK

被引:10
作者
Jiang, Fangzhou [1 ]
van Dokkum, Pieter [1 ]
Bezanson, Rachel [1 ]
Franx, Marijn [2 ]
机构
[1] Yale Univ, Dept Astron, New Haven, CT 06511 USA
[2] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands
关键词
galaxies: evolution; galaxies: formation; galaxies: individual (NGC 5845); STELLAR POPULATION SYNTHESIS; HUBBLE-SPACE-TELESCOPE; HIGH-REDSHIFT GALAXIES; STAR-FORMING GALAXIES; DIGITAL SKY SURVEY; MASSIVE GALAXIES; SAURON PROJECT; ELLIPTIC GALAXIES; SURFACE-DENSITY; RED SEQUENCE;
D O I
10.1088/2041-8205/749/1/L10
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent studies have identified a population of compact quiescent galaxies at z similar to 2. These galaxies are very rare today and establishing the existence of a nearby analog could allow us to study its structure in greater detail than is possible at high redshift. Here we present such a local analog, NGC 5845, which has a dynamical mass of M-dyn = 4.3 +/- 0.6 x 10(10) M-circle dot and an effective radius of only r(e) = 0.45 +/- 0.05 kpc. We study the structure and kinematics with HST/WFPC2 data and previously published spatially resolved kinematics. We find that NGC 5845 is similar to compact quiescent galaxies at z similar to 2 in terms of size versus dynamical mass (r(e)-M-dyn), effective velocity dispersion versus size (sigma(e)-r(e)), and effective velocity dispersion versus dynamical mass (sigma(e)-M-dyn). The galaxy has a prominent rotating disk evident in both the photometry and the kinematics: it extends to well beyond greater than or similar to 1/3 effective radius and contribute to greater than or similar to 1/4 of the total light of the galaxy. Our results lend support to the idea that a fraction of z similar to 2 compact galaxies have prominent disks and positive mass-to-light ratio gradients, although we caution that NGC 5845 may have had a different formation history than the more massive compact quiescent galaxies at z similar to 2.
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页数:6
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