THE NEXT GENERATION VIRGO CLUSTER SURVEY XVI: THE ANGULAR MOMENTUM OF DWARF EARLY-TYPE GALAXIES FROM GLOBULAR CLUSTER SATELLITES

被引:14
|
作者
Toloba, Elisa [1 ,2 ]
Li, Biao [3 ,4 ]
Guhathakurta, Puragra [1 ]
Peng, Eric W. [3 ,4 ]
Ferrarese, Laura [5 ]
Cote, Patrick [5 ]
Emsellem, Eric [6 ,7 ,8 ]
Gwyn, Stephen [5 ]
Zhang, Hongxin [3 ,4 ]
Boselli, Alessandro [9 ,10 ]
Cuillandre, Jean-Charles [11 ]
Jordan, Andres [12 ]
Liu, Chengze [13 ]
机构
[1] Univ Calif Santa Cruz, UCO, Lick Observ, 1156 High St, Santa Cruz, CA 95064 USA
[2] Texas Tech Univ, Dept Phys, Box 41051, Lubbock, TX 79409 USA
[3] Peking Univ, Dept Astron, Beijing 100871, Peoples R China
[4] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
[5] Natl Res Council Canada, Herzberg Astron & Astrophys, 5071 W Saanich Rd, Victoria, BC V9E 2E7, Canada
[6] European So Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany
[7] Univ Lyon 1, Observ Lyon, Ctr Rech Astrophys Lyon, 9 Ave Charles Andr, F-69230 St Genis Laval, France
[8] Ecole Normale Super Lyon, 9 Ave Charles Andr, F-69230 St Genis Laval, France
[9] Univ Aix Marseille, LAM, 38 Rue F Joliot Curie, F-13388 Marseille 13, France
[10] CNRS, UMR 7326, 38 Rue F Joliot Curie, F-13388 Marseille 13, France
[11] PSL Res Univ, Univ Paris Diderot, Observ Paris, CEA IRFU SAP,Lab AIM Paris Saclay,CNRS INSU, F-91191 Gif Sur Yvette, France
[12] Pontificia Univ Catolica Chile, Inst Astrofis, Vicuna Mackenna 4860, Santiago 7820436, Chile
[13] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China
来源
ASTROPHYSICAL JOURNAL | 2016年 / 822卷 / 01期
基金
中国国家自然科学基金;
关键词
galaxies: clusters: individual (Virgo); galaxies: dwarf; galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: halos; galaxies: kinematics and dynamics; DIGITAL SKY SURVEY; DARK-MATTER HALOES; ELLIPTIC GALAXIES; STELLAR KINEMATICS; STRUCTURAL-PROPERTIES; INTERNAL DYNAMICS; NGC; 4494; SPHEROIDAL GALAXIES; ASSEMBLY HISTORY; EVOLUTION;
D O I
10.3847/0004-637X/822/1/51
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We analyze the kinematics of six Virgo cluster dwarf early-type galaxies (dEs) from their globular cluster (GC) systems. We present new Keck/DEIMOS spectroscopy for three of them and re-analyze the data found in the literature for the remaining three. We use two independent methods to estimate the rotation amplitude (V-rot) and velocity dispersion (sigma(GC)) of the GC systems and evaluate their statistical significance by simulating non-rotating GC systems with the same number of GC satellites and velocity uncertainties. Our measured kinematics agree with the published values for the three galaxies from the literature and, in all cases, some rotation is measured. However, our simulations show that the null hypothesis of being non-rotating GC systems cannot be ruled out. In the case of VCC 1861, the measured V-rot and the simulations indicate that it is not rotating. In the case of VCC 1528, the null hypothesis can be marginally ruled out, and thus it might be rotating although further confirmation is needed. In our analysis, we find that, in general, the measured V-rot tends to be overestimated and the measured sigma(GC) tends to be underestimated by amounts that depend on the intrinsic V-rot/sigma(GC), the number of observed GCs (N-GC), and the velocity uncertainties. The bias is negligible when N-GC greater than or similar to 20. In those cases where a large N-GC is not available, it is imperative to obtain data with small velocity uncertainties. For instance, errors of <= 2 km s(-1) lead to V-rot < 10 km s(-1) for a system that is intrinsically not rotating.
引用
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页数:19
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