2014MNRAS.437.3362B

Query : 2014MNRAS.437.3362B

2014MNRAS.437.3362B - Mon. Not. R. Astron. Soc., 437, 3362-3372 (2014/February-1)

Major substructure in the M31 outer halo: the South-West Cloud.

BATE N.F., CONN A.R., McMONIGAL B., LEWIS G.F., MARTIN N.F., McCONNACHIE A.W., VELJANOSKI J., MacKEY A.D., FERGUSON A.M.N., IBATA R.A., IRWIN M.J., FARDAL M., HUXOR A.P. and BABUL A.

Abstract (from CDS):

We undertake the first detailed analysis of the stellar population and spatial properties of a diffuse substructure in the outer halo of M31. The South-West Cloud lies at a projected distance of ∼ 100kpc from the centre of M31 and extends for at least ∼ 50kpc in projection. We use Pan-Andromeda Archaeological Survey photometry of red giant branch stars to determine a distance to the South-West Cloud of 793^+45_-45kpc. The metallicity of the cloud is found to be [Fe/H] = -1.3±0.1. This is consistent with the coincident globular clusters PAndAS-7 and PAndAS-8, which have metallicities determined using an independent technique of [Fe/H] = -1.35±0.15. We measure a brightness for the Cloud of MV = -12.1mag; this is ∼ 75percent of the luminosity implied by the luminosity-metallicity relation. Under the assumption that the South-West Cloud is the visible remnant of an accreted dwarf satellite, this suggests that the progenitor object was amongst M31's brightest dwarf galaxies prior to disruption.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): galaxies: individual: M31 - Local Group - galaxies: stellar content

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 - 2026 		#notes
1 NAME Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 129 0
2 NAME Andromeda XX G 00 07 30.70 +35 07 56.4     18.2     ~ 77 0
3 NAME PA-7 GlC 00 10 51.350 +39 35 58.55           ~ 14 0
4 NAME PA-8 GlC 00 12 52.450 +38 17 47.86           ~ 14 0
5 NAME M31 SW Cloud St* 00 13 49.77 +37 44 54.9           ~ 12 0
6 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 168 0
7 NAME PA-14 GlC 00 20 33.8910473568 +36 39 34.432123392           ~ 13 0
8 NAME Andromeda XXVI G 00 23 45.6 +47 54 58     17.3     ~ 76 0
9 NAME Andromeda XXV G 00 30 08.9 +46 51 07     14.8     ~ 120 0
10 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
11 NAME G1 Clump As* 00 35 28.0 +39 36 19           ~ 31 1
12 NAME Andromeda III G 00 35 33.8 +36 29 52     14.4     ~ 309 0
13 NAME Cassiopeia III G 00 35 59.4 +51 33 35           ~ 59 0
14 NAME Andromeda XVII G 00 37 07.0 +44 19 20     15.8     ~ 101 0
15 NAME Andromeda XXVII G 00 37 27.1 +45 23 13     16.7     ~ 82 0
16 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
17 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
18 NAME Andromeda I G 00 45 39.8 +38 02 28   13.9 12.7     ~ 355 0
19 NAME Andromeda XI G 00 46 20.0 +33 48 05     17.5     ~ 130 0
20 NAME Andromeda XII G 00 47 27.0 +34 22 29     18.3     ~ 124 0
21 NAME Andromeda XIV G 00 51 35.0 +29 41 49     15.9     ~ 132 0
22 NAME Andromeda XIII G 00 51 51.0 +33 00 16     18.1     ~ 128 0
23 NAME Andromeda IX G 00 52 53.0 +43 11 45     16.3     ~ 176 1
24 NAME Pisces V G 00 59 29.8 +32 22 36     14.4     ~ 149 0
25 NAME Andromeda X G 01 06 33.70 +44 48 15.8     16.6     ~ 125 1
26 NAME Andromeda V G 01 10 17.1 +47 37 41     15.3     ~ 215 0
27 NAME Andromeda XV G 01 14 18.7 +38 07 03     14.6     ~ 123 0
28 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
29 NAME Andromeda XXIV G 01 18 30.0 +46 21 58     16.3     ~ 64 0
30 NAME Andromeda XXII G 01 27 40.0 +28 05 25     18.0     ~ 95 0
31 NAME Andromeda XXIII G 01 29 21.8 +38 43 08     14.2     ~ 88 0
32 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
33 NAME Bootes III G 13 57 07.4 +26 46 30     12.6     ~ 115 1
34 Cl Pal 5 GlC 15 16 05.30 -00 06 41.0   15.1       ~ 797 1
35 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
36 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
37 NAME Lacerta I G 22 58 16.3 +41 17 28           ~ 53 0
38 NAME Andromeda XXI G 23 54 47.7 +42 28 15     14.8     ~ 117 0
39 NAME Galactic Bulge reg ~ ~           ~ 4794 0
40 NAME Local Group GrG ~ ~           ~ 9325 0

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