Very Large Telescope Spectroscopy of Ultra-faint Dwarf Galaxies. I. Bootes I, Leo IV, and Leo V

被引：33

作者：

Jenkins, Sydney A. ^{[1
,2
,3
]}

Li, Ting S. ^{[4
,5
,6
]}

Pace, Andrew B. ^{[7
]}

Ji, Alexander P. ^{[4
]}

Koposov, Sergey E. ^{[8
,9
]}

Mutlu-Pakdil, Burcin ^{[10
,11
]}

机构：

[1] Univ Chicago, Dept Phys, Chicago, IL 60637 USA

[2] MIT, Dept Phys, Cambridge, MA 02139 USA

[3] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[4] Observ Carnegie Inst Sci, 813 Santa Barbara St, Pasadena, CA 91101 USA

[5] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[6] Univ Toronto, Dept Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada

[7] Carnegie Mellon Univ, McWilliams Ctr Cosmol, 5000 Forbes Ave, Pittsburgh, PA 15213 USA

[8] Univ Edinburgh, Inst Astron, Royal Observ, Blackford Hill, Edinburgh EH9 3HJ, Midlothian, Scotland

[9] Univ Cambridge, Inst Astron, Madingley Rd, Cambridge CB3 0HA, England

[10] Univ Chicago, Kavli Inst Cosmol Phys, Chicago, IL 60637 USA

[11] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

来源：

ASTROPHYSICAL JOURNAL | 2021年 / 920卷 / 02期

关键词：

MILKY-WAY SATELLITE; DARK-MATTER; SPHEROIDAL GALAXY; KINEMATICS; METALLICITY; DISTANT; TRIPLET; STARS; CONSTRAINTS; EFFICIENT;

D O I：

10.3847/1538-4357/ac1353

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We perform consistent reductions and measurements for three ultra-faint dwarf galaxies (UFDs): Bootes I, Leo IV, and Leo V. Using the public archival data from the GIRAFFE spectrograph on the Very Large Telescope (VLT), we locate new members and provide refined measurements of physical parameters for these dwarf galaxies. We identify nine new Leo IV members and four new Leo V members, and perform a comparative analysis of previously discovered members. Additionally, we identify one new binary star in both Leo IV and Leo V. After removing binary stars, we recalculate the velocity dispersions of Bootes I and Leo IV to be 5.1(-0.8)(+0.7) and 3.4(-0.9)(+1.3) km s(-1), respectively; we do not resolve the Leo V velocity dispersion. We identify a weak velocity gradient in Leo V that is similar to 4x smaller than the previously calculated gradient and that has a corresponding position angle that differs from the value in the literature by similar to 120 degrees. Combining the VLT data with previous values from the literature, we reanalyze the Bootes I metallicity distribution function and find that a model including infall of pristine gas, while Bootes I was forming stars' best fits the data. Our analysis of Leo IV, Leo V, and other UFDs will enhance our understanding of these enigmatic stellar populations and contribute to future dark matter studies. This is the first in a series of papers examining 13 UDFs observed with VLT/GIRAFFE between 2009 and 2017. Similar analyses of the remaining 10 UFDs will be presented in forthcoming papers.

引用

页数：25

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