2004MNRAS.348...12M


Query : 2004MNRAS.348...12M

2004MNRAS.348...12M - Mon. Not. R. Astron. Soc., 348, 12-23 (2004/February-2)

A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion on to the Milky Way.

MARTIN N.F., IBATA R.A., BELLAZZINI M., IRWIN M.J., LEWIS G.F. and DEHNEN W.

Abstract (from CDS):

We present an analysis of the asymmetries in the population of Galactic M-giant stars present in the 2MASS All Sky catalogue. Several large-scale asymmetries are detected, the most significant of which is a strong elliptical-shaped stellar overdensity, close to the Galactic plane at (ℓ= 240°, b =-8°), in the constellation of Canis Major. A small grouping of globular clusters (NGC 1851, 1904, 2298 and 2808), coincident in position and radial velocity, surround this structure, as do a number of open clusters. The population of M-giant stars in this overdensity is similar in number to that in the core of the Sagittarius dwarf galaxy. We argue that this object is the likely dwarf galaxy progenitor of the ring-like structure that has recently been found at the edge of the Galactic disc. A numerical study of the tidal disruption of an accreted dwarf galaxy is presented. The simulated debris fits the extant position, distance and velocity information on the Galactic `Ring', as well as that of the M-giant overdensities, suggesting that all these structures are the consequence of a single accretion event. The disrupted dwarf galaxy stream orbits close to the Galactic plane, with a pericentre at approximately the solar circle, an orbital eccentricity similar to that of stars in the Galactic thick disc, as well as a vertical scaleheight similar to that of the thick disc. This finding strongly suggests that the Canis Major dwarf galaxy is a building block of the Galactic thick disc, that the thick disc is continually growing, even up to the present time, and that thick disc globular clusters were accreted on to the Milky Way from dwarf galaxies in co-planar orbits.

Abstract Copyright: 2004 RAS

Journal keyword(s): Galaxy: formation - Galaxy: structure - galaxies: interactions

CDS comments: 'NAME CMA DWARF GALAXY' in SIMBAD.

Simbad objects: 40

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Number of rows : 40
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 1261 GlC 03 12 16.21 -55 12 58.4     8.63     ~ 472 0
2 Cl Pal 1 GlC 03 33 20.04 +79 34 51.8   17.2       ~ 221 1
3 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1331 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16075 1
5 M 79 GlC 05 24 10.59 -24 31 27.3   9.21 8.16     ~ 763 0
6 Cl Berkeley 20 OpC 05 32 36 +00 11.1           ~ 107 0
7 Cl King 8 OpC 05 49 18 +33 38.0   11.90 11.2     ~ 52 0
8 Cl Berkeley 22 OpC 05 58 28 +07 45.8           ~ 71 0
9 Cl Berkeley 23 OpC 06 33 28.5 +20 32 47           ~ 28 0
10 C 0642+003 OpC 06 45 06 +00 18.0   8.19 7.6     ~ 70 1
11 NGC 2298 GlC 06 48 59.41 -36 00 19.1   10.77 8.89     ~ 460 0
12 Cl Berkeley 29 OpC 06 53 04.2 +16 55 39   14.3       ~ 155 0
13 Cl Berkeley 31 OpC 06 57 37 +08 17.1           ~ 106 0
14 Cl Haffner 2 OpC 07 03 06 -20 49.2           ~ 117 0
15 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 197 1
16 ESO 368-7 OpC 07 38 44 -33 50.7           ~ 48 0
17 Cl Haffner 18 OpC 07 52 40 -26 23.2   10.09 9.3     ~ 47 1
18 NGC 2808 GlC 09 12 03.10 -64 51 48.6           ~ 1333 0
19 NAME UKS 2 OpC 09 25 15 -54 43.1           ~ 34 0
20 ESO 92-18 OpC 10 14 55 -64 36.7           ~ 27 0
21 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 798 0
22 C 1235-509 GlC 12 38 40.20 -51 09 01.0           ~ 345 0
23 M 68 GlC 12 39 27.98 -26 44 38.6   10.26 7.96     ~ 937 0
24 ESO 96-4 OpC 13 15 16.0 -65 55 16           ~ 38 0
25 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3240 0
26 NGC 5286 GlC 13 46 26.81 -51 22 27.3   9.18 8.31     ~ 402 0
27 ESO 224-8 OpC 15 39 05.4 -50 03 02           ~ 59 0
28 NGC 6101 GlC 16 25 48.12 -72 12 07.9   10.90 10.08     ~ 266 0
29 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2104 0
30 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1998 0
31 IC 1257 Bz? 17 27 06.00 -07 05 00.0           ~ 69 0
32 NGC 6426 GlC 17 44 54.71 +03 10 12.5           ~ 202 0
33 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1959 2
34 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 999 0
35 M 56 GlC 19 16 35.57 +30 11 00.5   8.90       ~ 392 0
36 Cl Terzan 7 GlC 19 17 43.92 -34 39 27.8           ~ 399 0
37 Cl Arp 2 GlC 19 28 44.11 -30 21 20.3     12.41     ~ 331 0
38 Cl Terzan 8 GlC 19 41 44.41 -33 59 58.1     11.54     ~ 292 0
39 M 15 GlC 21 29 58.33 +12 10 01.2   3       ~ 3026 0
40 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 965 1

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2022.07.06-18:31:40

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