2011ApJ...739...46L


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST09:07:18

2011ApJ...739...46L - Astrophys. J., 739, 46 (2011/September-3)

Evolutionary tracks of tidally stirred disky dwarf galaxies.

LOKAS E.L., KAZANTZIDIS S. and MAYER L.

Abstract (from CDS):

Using collisionless N-body simulations, we investigate the tidal evolution of late-type, rotationally supported dwarfs inside Milky Way sized host galaxies. Our study focuses on a wide variety of dwarf orbital configurations and initial structures. During the evolution, the disky dwarfs undergo strong mass loss, the stellar disks are transformed into spheroids, and rotation is replaced by random motions of the stars. Thus, the late-type progenitors are transformed into early-type dwarfs as envisioned by the tidal stirring model for the formation of dwarf spheroidal (dSph) galaxies in the Local Group. We determine the photometric properties of the dwarfs, including the total visual magnitude, the half-light radius, and the central surface brightness as they would be measured by an observer near the galactic center. Special emphasis is also placed on studying their kinematics and shapes. We demonstrate that the measured values are biased by a number of observational effects including the increasing angle of the observation cone near the orbital pericenter, the fact that away from the pericenter the tidal tails are typically oriented along the line of sight, and the fact that for most of the evolution the stellar components of the dwarfs are triaxial ellipsoids whose major axis tumbles with respect to the line of sight. Finally, we compare the measured properties of the simulated dwarfs to those of dwarf galaxies in the Local Group. The evolutionary tracks of the dwarfs in different parameter planes and the correlations between their different properties, especially the total magnitude and the surface brightness, strongly suggest that present-day dSph galaxies may have indeed formed from late-type progenitors as proposed by the tidal stirring scenario.

Abstract Copyright:

Journal keyword(s): galaxies: dwarf - galaxies: fundamental parameters - galaxies: kinematics and dynamics - galaxies: structure - Local Group

Status at CDS:  

Simbad objects: 52

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Number of rows : 52

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 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 569 2
2 NAME Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 98 0
3 NAME Sculptor dIG G 00 08 13.4 -34 34 41   15.54   14.99   ~ 134 3
4 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 115 0
5 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1005 0
6 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 202 0
7 NAME Andromeda XXV G 00 30 08.9 +46 51 07     14.8     ~ 85 0
8 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 619 1
9 NAME Andromeda III G 00 35 22.7 +36 30 17     14.4     ~ 270 0
10 NAME Andromeda XVII G 00 37 07.0 +44 19 20     15.8     ~ 78 0
11 NGC 185 Sy2 00 38 57.970 +48 20 14.56   9.10 9.2     ~ 726 1
12 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10848 1
13 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 303 0
14 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 105 0
15 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 148 1
16 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 114 0
17 NAME Pisces I G 01 03 56.6 +21 53 41   16.18 14.3     ~ 357 0
18 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1103 2
19 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 97 1
20 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 186 0
21 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 93 0
22 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 340 0
23 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 65 0
24 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 446 2
25 NAME Fornax Dwarf Spheroidal G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1466 1
26 UGCA 92 G 04 32 04.9 +63 36 49   16.15       ~ 115 0
27 NAME Carina dSph G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 985 0
28 UGC 4879 G 09 16 02.0197873600 +52 50 42.052874443   14.0 13.2     ~ 103 0
29 NAME Leo T dSph G 09 34 53.4 +17 03 05     15.1     ~ 305 0
30 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 546 0
31 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 466 0
32 NGC 3109 G 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 690 2
33 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 194 1
34 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1042 1
35 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 651 2
36 NAME Dwarf Elliptical Galaxy in Sex G 10 13 02.9 -01 36 53   12 10.4     ~ 699 0
37 NAME Leo B G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 730 0
38 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 437 0
39 NAME CVn I dSph G 13 28 03.5 +33 33 21     13.1     ~ 254 1
40 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1173 0
41 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1158 1
42 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1722 2
43 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 275 1
44 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1426 0
45 NAME Aquarius Dwarf G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 392 1
46 IC 5152 G 22 02 41.521 -51 17 47.20   11.03 10.9 10.19   ~ 218 1
47 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 264 0
48 ESO 407-18 G 23 26 27.52 -32 23 19.5 15.34 14.71 14.23 14.03   ~ 142 0
49 NAME Andromeda VII GiG 23 26 31.7 +50 40 33   13.6 11.8     ~ 177 1
50 NAME Peg dSph GiG 23 51 46.4 +24 35 11   14.5 13.2     ~ 215 2
51 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 86 0
52 NAME Local Group GrG ~ ~           ~ 6919 0

    Equat.    Gal    SGal    Ecl

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2020.05.27-09:07:18

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