2009MNRAS.399..737M

Query : 2009MNRAS.399..737M

2009MNRAS.399..737M - Mon. Not. R. Astron. Soc., 399, 737-743 (2009/October-3)

A panoramic view of M81: new stellar systems in the debris field.

MOUHCINE M. and IBATA R.

Abstract (from CDS):

Using the MegaCam imager on the Canada-France-Hawaii Telescope, we have resolved individual stars in the outskirts of the nearby large spiral galaxy M81 (NGC 3031) well below the tip of the red giant branch of metal-poor stellar populations over ∼60x58kpc2. In this paper, we report the discovery of new young stellar systems in the outskirts of M81. The most prominent feature is a chain of clumps of young stars distributed along the extended southern Hi tidal arm connecting M 81 and NGC 3077. The colour-magnitude diagrams of these stellar systems show plumes of bright main sequence stars and red supergiant stars, indicating extended events of star formation. The main sequence turn-offs of the youngest stars in the systems are consistent with ages of ∼40 Myr. The newly reported stellar systems show strong similarities with other known young stellar systems in the debris field around M81, with their properties best explained by these systems being of tidal origin.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): galaxies: formation - galaxies: individual (M81, NGC 3077, Holmberg IX, BK 3N, Garland) - galaxies: photometry - galaxies: stellar content

Nomenclature: Fig. 1, Table 1: [MI2009] Clump R (Nos I-III).

Simbad objects: 24

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Number of rows : 24
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NGC 520 AGN 01 24 35.07120 +03 47 32.6760 12.41 12.24 11.42     ~ 528 3
3 NGC 2976 GiG 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 712 1
4 LEDA 28529 G 09 53 48.8 +68 58 09   18.89       ~ 97 1
5 [D2008b] TDO 3 PoG 09 54 05.0 +69 18 49           ~ 3 0
6 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
7 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
8 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 6156 6
9 LEDA 5057029 G 09 57 21.2 +68 42 55           ~ 11 0
10 NAME Arp Loop G 09 57 29.0 +69 16 20           ~ 71 1
11 MCG+12-10-012 AG? 09 57 32.8632 +69 02 50.735 15.19 15.15 14.10 14.12   ~ 327 4
12 [D2008b] TDO 2 PoG 09 58 02.0 +68 54 10           ~ 2 0
13 [D2008b] TDO 1 PoG 09 58 17.0 +68 57 40           ~ 2 0
14 LEDA 5056936 G 09 59 33.1 +68 39 25           ~ 16 0
15 LEDA 5057030 G 10 00 40.4 +68 39 37           ~ 10 0
16 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 808 0
17 NAME Garland G 10 03 43.1 +68 41 32           ~ 69 2
18 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 703 1
19 NAME Antennae IG 12 01 53.170 -18 52 37.92           ~ 1749 0
20 NGC 5713 GiG 14 40 11.528 -00 17 21.16 11.88 11.84 11.20     ~ 421 2
21 NGC 5719 GiG 14 40 56.3690411016 -00 19 05.854225080   13.10   12.061   ~ 187 2
22 NGC 7769 LIN 23 51 03.9747703056 +20 09 01.552564620   12.77       ~ 157 2
23 NGC 7771 GiG 23 51 24.880 +20 06 42.57 13.42 13.08 12.25     ~ 350 3
24 NAME Local Group GrG ~ ~           ~ 9325 0

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