2003ApJ...583..752E

Query : 2003ApJ...583..752E

2003ApJ...583..752E - Astrophys. J., 583, 752-757 (2003/February-1)

New mass estimators for tracer populations.

EVANS N.W., WILKINSON M.I., PERRETT K.M. and BRIDGES T.J.

Abstract (from CDS):

We introduce the ``tracer mass estimator.'' This is a new and simple way to estimate the enclosed mass from the projected positions and line-of-sight velocities of a tracer population (such as globular clusters, halo stars, and planetary nebulae). Like the projected mass estimator, it works by averaging (projecteddistance)(radialvelocity)2/G over the sample. However, it applies to the commonest case of all, in which the tracer population does not follow the overall dark matter density. The method is verified against simulated data sets drawn from Monte Carlo realizations of exact solutions of the collisionless Boltzmann equation and applied to the M31 globular cluster data set of Perrett and coworkers, as well as to M31's satellite galaxies.

Abstract Copyright: ∼

Journal keyword(s): Cosmology: Dark Matter - Galaxies: General - Galaxies: Halos - Galaxies: Individual: Messier Number: M31 - Galaxies: Kinematics and Dynamics

Simbad objects: 17

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Number of rows : 17
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

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