2014MNRAS.440..908P

Query : 2014MNRAS.440..908P

2014MNRAS.440..908P - Mon. Not. R. Astron. Soc., 440, 908-919 (2014/May-1)

Perseus I and the NGC 3109 association in the context of the Local Group dwarf galaxy structures.

PAWLOWSKI M.S. and McGAUGH S.S.

Abstract (from CDS):

The recently discovered dwarf galaxy Perseus I appears to be associated with the dominant plane of non-satellite galaxies in the Local Group (LG). We predict its velocity dispersion and those of the other isolated dwarf spheroidals Cetus and Tucana to be 6.5, 8.2 and 5.5 km/s, respectively. The NGC 3109 association, including the recently discovered dwarf galaxy Leo P, aligns with the dwarf galaxy structures in the LG such that all known nearby non-satellite galaxies in the northern Galactic hemisphere lie in a common thin plane (rms height 53kpc; diameter 1.2Mpc). This plane has an orientation similar to the preferred orbital plane of the Milky Way (MW) satellites in the vast polar structure. Five of seven of these northern galaxies were identified as possible backsplash objects, even though only about one is expected from cosmological simulations. This may pose a problem, or instead the search for local backsplash galaxies might be identifying ancient tidal dwarf galaxies expelled in a past major galaxy encounter. The NGC 3109 association supports the notion that material preferentially falls towards the MW from the Galactic south and recedes towards the north, as if the MW were moving through a stream of dwarf galaxies.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: dwarf - galaxies: groups: individual: NGC 3109 association - galaxies: individual: Perseus I - galaxies: kinematics and dynamics - Local Group - dark matter

Simbad objects: 32

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Number of rows : 32
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 NAME Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
3 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
4 NAME Magellanic Stream HVC 00 32 -30.0           ~ 1079 1
5 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
6 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
7 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
8 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
9 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
10 NAME Andromeda XXII G 01 27 40.0 +28 05 25     18.0     ~ 95 0
11 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
12 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 575 2
13 NAME Andromeda XXXIII G 03 01 23.6 +40 59 18           ~ 43 0
14 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
15 Z 264-88 AG? 09 16 02.0195908968 +52 50 42.051257412   14.0 13.2     ~ 141 0
16 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 434 0
17 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
18 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
19 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
20 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
21 NAME Antlia Dwarf Galaxy G 10 04 03.9 -27 20 01 16.73 15.69 15.17 15.00   ~ 221 1
22 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
23 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
24 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 268 0
25 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
26 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
27 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
28 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
29 NAME Andromeda XXVIII G 22 32 41.20 +31 12 58.2     15.6     ~ 88 0
30 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
31 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
32 NAME Local Group GrG ~ ~           ~ 9325 0

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