2000ApJ...540L...9E

Query : 2000ApJ...540L...9E

2000ApJ...540L...9E - Astrophys. J., 540, L9-L12 (2000/September-1)

Dynamical mass estimates for the halo of M31 from Keck spectroscopy.

EVANS N.W., WILKINSON M.I., GUHATHAKURTA P., GREBEL E.K. and VOGT S.S.

Abstract (from CDS):

The last few months have seen the measurements of the radial velocities of all of the dwarf spheroidal companions to the Andromeda galaxy (M31) using the spectrographs (HIRES and LRIS) on the Keck Telescope. This Letter summarizes the data on the radial velocities and distances for all the companion galaxies and presents new dynamical modeling to estimate the mass of the extended halo of M31. The best-fit values for the total mass of M31 are ~(7-10)x1011 M☉, depending on the details of the modeling. The mass estimate is accompanied by considerable uncertainty caused by the small size of the data set; for example, the upper bound on the total mass is ∼24x1011 M☉, while the lower bound is ∼3x1011 M☉. These values are less than the most recent estimates of the most likely mass of the Milky Way halo. Bearing in mind all the uncertainties, a fair conclusion is that the M31 halo is roughly as massive as that of the Milky Way halo. There is no dynamical evidence for the widely held belief that M31 is more massive–it may even be less massive.

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Journal keyword(s): Galaxies: Halos - Galaxies: Individual: Messier Number: M31 - Galaxies: Kinematics and Dynamics - Galaxies: Structure - Galaxies: Local Group

CDS comments: Table 1 : Coordinates of Cas dSph (= AND VII) are incorrect (see table 3 of 2003ApJ.583.752E)

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
2 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
3 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
4 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
5 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
6 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
7 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
8 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
9 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
10 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
11 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
12 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
13 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
14 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
15 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
16 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
17 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
18 NAME Local Group GrG ~ ~           ~ 9325 0

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