THE OUTER LIMITS OF THE M31 SYSTEM: KINEMATICS OF THE DWARF GALAXY SATELLITES AND XXVIII & AND XXIX

We present Keck/DEIMOS spectroscopy of resolved stars in the M31 satellites And XXVIII and And XXIX. We show that these are likely 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 + or - 1.8 km s super(-1) and a vel...

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Veröffentlicht in:	The Astrophysical journal 2013-05, Vol.768 (1), p.1-8
Hauptverfasser:	Tollerud, Erik J, Geha, Marla C, Vargas, Luis C, Bullock, James S
Format:	Artikel
Sprache:	eng
Schlagworte:	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Deimos DISPERSIONS DISTANCE Dwarf galaxies GALAXIES Kinematics LUMINOSITY MASS NONLUMINOUS MATTER SATELLITES SPECTROSCOPY STARS VELOCITY
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creator	Tollerud, Erik J Geha, Marla C Vargas, Luis C Bullock, James S
description	We present Keck/DEIMOS spectroscopy of resolved stars in the M31 satellites And XXVIII and And XXIX. We show that these are likely 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 + or - 1.8 km s super(-1) and a velocity dispersion of 4.9 + or - 1.6 km s super(-1), implying a mass-to-light ratio (within r sub(1/2)) of ~44 + or - 41. And XXIX has a systemic velocity of -194.4 + or - 1.5 km s super(-1) and velocity dispersion of 5.7 + or - 1.2 km s super(-1), implying a mass-to-light ratio (within r sub(1/2)) of ~124 + or - 72. The internal kinematics and implied masses of And XXVIII and And XXIX are similar to those of dwarf spheroidals (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.
doi_str_mv	10.1088/0004-637X/768/1/50
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We show that these are likely 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 + or - 1.8 km s super(-1) and a velocity dispersion of 4.9 + or - 1.6 km s super(-1), implying a mass-to-light ratio (within r sub(1/2)) of ~44 + or - 41. And XXIX has a systemic velocity of -194.4 + or - 1.5 km s super(-1) and velocity dispersion of 5.7 + or - 1.2 km s super(-1), implying a mass-to-light ratio (within r sub(1/2)) of ~124 + or - 72. The internal kinematics and implied masses of And XXVIII and And XXIX are similar to those of dwarf spheroidals (dSphs) of comparable luminosities, implying that these objects are dark-matter-dominated dwarf galaxies. 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We show that these are likely 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 + or - 1.8 km s super(-1) and a velocity dispersion of 4.9 + or - 1.6 km s super(-1), implying a mass-to-light ratio (within r sub(1/2)) of ~44 + or - 41. And XXIX has a systemic velocity of -194.4 + or - 1.5 km s super(-1) and velocity dispersion of 5.7 + or - 1.2 km s super(-1), implying a mass-to-light ratio (within r sub(1/2)) of ~124 + or - 72. The internal kinematics and implied masses of And XXVIII and And XXIX are similar to those of dwarf spheroidals (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.</abstract><cop>United States</cop><doi>10.1088/0004-637X/768/1/50</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record>
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subjects	ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Deimos DISPERSIONS DISTANCE Dwarf galaxies GALAXIES Kinematics LUMINOSITY MASS NONLUMINOUS MATTER SATELLITES SPECTROSCOPY STARS VELOCITY
title	THE OUTER LIMITS OF THE M31 SYSTEM: KINEMATICS OF THE DWARF GALAXY SATELLITES AND XXVIII & AND XXIX
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