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arXiv 1701.04835astro-ph.GA
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SLUGGS巡天:27个邻近早型星系中超过4000个球状星团径向速度的星表

The SLUGGS Survey: a catalog of over 4000 globular cluster radial velocities in 27 nearby early-type galaxies

Duncan A. Forbes, Adebusola Alabi, Jean P. Brodie, Aaron J. Romanowsky, Jay Strader, Caroline Foster, Christopher Usher, Lee Spitler, Sabine Bellstedt, Nicola P… 展开作者

Duncan A. Forbes, Adebusola Alabi, Jean P. Brodie, Aaron J. Romanowsky, Jay Strader, Caroline Foster, Christopher Usher, Lee Spitler, Sabine Bellstedt, Nicola Pastorello, Alexa Villaume, Asher Wasserman, Vincenzo Pota

摘要:

在这里,我们目前的位置和径向速度超过4000球状星团(GC)在27个附近的早型星系的SLUGGS调查。SLUGGS巡天的目的是代表恒星质量范围为10 $<$ log M $_{\ast}$/M $_{\odot}$ $<$ 11.7的椭圆星系和透镜星系。这些数据是多年来获得的,主要是使用凯克II 10米望远镜上非常稳定的多目标摄谱仪DEIMOS。径向速度是用钙三重线测量的,速度精度为$\pm$ 10-15 km/s。我们使用相空间图(即速度-位置图),以确定污染物,如前景恒星和背景星系,并表明,从邻近星系的GC的贡献一般是微不足道的。可能的超紧凑矮星被单独列表。我们发现GC系统的平均速度接近于宿主星系的系统速度,表明GC系统在星系势中处于整体的动力学平衡。我们还发现,GC系统的速度色散标度与宿主星系恒星质量以类似的方式的Faber-Jackson关系的恒星速度色散。这些GC视向速度表的出版,应使进一步的研究在许多领域,如GC系统的子结构,运动学和宿主星系质量的测量。

英文摘要:

Here we present positions and radial velocities for over 4000 globular clusters (GCs) in 27 nearby early-type galaxies from the SLUGGS survey. The SLUGGS survey is designed to be representative of elliptical and lenticular galaxies in the stellar mass range 10 $<$ log M$_{\ast}$/M$_{\odot}$ $<$ 11.7. The data have been obtained over many years, mostly using the very stable multi-object spectrograph DEIMOS on the Keck II 10m telescope. Radial velocities are measured using the calcium triplet lines with a velocity accuracy of $\pm$ 10-15 km/s. We use phase space diagrams (i.e. velocity--position diagrams) to identify contaminants such as foreground stars and background galaxies, and to show that the contribution of GCs from neighboring galaxies is generally insignificant. Likely ultra-compact dwarfs are tabulated separately. We find that the mean velocity of the GC system is close to that of the host galaxy systemic velocity, indicating that the GC system is in overall dynamical equilibrium within the galaxy potential. We also find that the GC system velocity dispersion scales with host galaxy stellar mass in a similar manner to the Faber-Jackson relation for the stellar velocity dispersion. Publication of these GC radial velocity catalogs should enable further studies in many areas, such as GC system substructure, kinematics, and host galaxy mass measurements.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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