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Article overview
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The Outer Limits of the M31 System: Kinematics of the Dwarf Galaxy Satellites And XXVIII and And XXIX | | Erik J. Tollerud
; Marla C. Geha
; Luis C. Vargas
; James S. Bullock
; | | Date: |
4 Feb 2013 | | Abstract: | We present Keck/DEIMOS spectroscopy of resolved stars in the M31 satellites
And XXVIII and And XXIX. We show that these are self-bound galaxies based on 18
and 24 members in And XXVIII and And XXIX, respectively. And XXVIII has a
systemic velocity of -331.1 +/- 1.8 km/s and velocity dispersion of 4.9 +/- 1.6
km/s, implying a mass-to-light ratio (within r_1/2) of ~ 44 +/- 41. And XXIX
has a systemic velocity of -194.4 +/- 1.5 km/s and velocity dispersion of 5.7
+/- 1.2 km/s, implying a mass-to-light ratio (within r_1/2) of ~124 +/- 72. The
internal kinematics and implied masses of And XXIX and And XXVIII are similar
to dSphs of comparable luminosities, implying that these objects are dark
matter-dominated dwarf galaxies. Despite the large projected distances from
their host (380 and 188 kpc), the kinematics of these dSph suggest that they
are bound M31 satellites. | | Source: | arXiv, 1302.0848 | | Services: | Forum | Review | PDF | Favorites | |
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