2008ApJ...679..346M


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.06CEST11:09:04

2008ApJ...679..346M - Astrophys. J., 679, 346-372 (2008/May-3)

Modeling the structure and dynamics of dwarf spheroidal galaxies with dark matter and tides.

MUNOZ R.R., MAJEWSKI S.R. and JOHNSTON K.V.

Abstract (from CDS):

We report the results of N-body simulations of disrupting satellites aimed at exploring whether the observed features of dSphs can be accounted for with simple, mass-follows-light (MFL) models including tidal disruption. As a test case, we focus on the Carina dwarf spheroidal (dSph), which presently is the dSph system with the most extensive data at large radius. We find that previous N-body, MFL simulations of dSphs did not sufficiently explore the parameter space of satellite mass, density, and orbital shape to find adequate matches to Galactic dSph systems, whereas with a systematic survey of parameter space we are able to find tidally disrupting, MFL satellite models that rather faithfully reproduce Carina's velocity profile, velocity dispersion profile, and projected density distribution over its entire sampled radius. The successful MFL model satellites have very eccentric orbits, currently favored by CDM models, and central velocity dispersions that still yield an accurate representation of the bound mass and observed central M/L∼40 of Carina, despite inflation of the velocity dispersion outside the dSph core by unbound debris. Our survey of parameter space also allows us to address a number of commonly held misperceptions of tidal disruption and its observable effects on dSph structure and dynamics. The simulations suggest that even modest tidal disruption can have a profound effect on the observed dynamics of dSph stars at large radii. Satellites that are well described by tidally disrupting MFL models could still be fully compatible with ΛCDM if, for example, they represent a later stage in the evolution of luminous subhalos.

Abstract Copyright:

Journal keyword(s): Cosmology: Dark Matter - Galaxies: Kinematics and Dynamics - Galaxies: Stellar Content - Galaxies: Local Group

Status at CDS:  

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 - 2020
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10778 1
2 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 301 0
3 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 978 0
4 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 301 0
5 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1033 1
6 NAME Leo B G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 722 0
7 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 246 1
8 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 324 0
9 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1162 0
10 NAME Serpens Dwarf GlC 15 16 05.30 -00 06 41.0   15.1       ~ 612 1
11 ACO 2151 ClG 16 05 15.0 +17 44 55           ~ 549 3
12 NAME Her Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 266 1
13 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1147 1
14 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11322 0
15 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1699 2
16 NAME Orphan Stream St* ~ ~           ~ 183 0
17 NAME Local Group GrG ~ ~           ~ 6851 0

    Equat.    Gal    SGal    Ecl

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2020.04.06-11:09:04

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