2009AJ....137.3009C

Query : 2009AJ....137.3009C

2009AJ....137.3009C - Astron. J., 137, 3009-3037 (2009/February-0)

Discovery of new dwarf galaxies in the M81 group.

CHIBOUCAS K., KARACHENTSEV I.D. and TULLY R.B.

Abstract (from CDS):

An order of magnitude more dwarf galaxies are expected to inhabit the Local Group, based on currently accepted galaxy formation models, than have been observed. This discrepancy has been noted in environments ranging from the field to rich clusters. However, no complete census of dwarf galaxies exists in any environment. The discovery of the smallest and faintest dwarfs is hampered by the limitations in detecting such faint and low surface brightness galaxies. An even greater difficulty is establishing distances to, or group/cluster membership for, such faint galaxies. The M81 Group provides an almost unique opportunity for establishing membership for galaxies in a low-density region complete to magnitudes as faint as. With a distance modulus of 27.8, the tip of the red giant branch just resolves in ground-based surveys. We have surveyed a 65 deg2 region around M81 with Canada-France-Hawaii Telescope/MegaCam. From these images, we have detected 22 new dwarf galaxy candidates. Photometric, morphological, and structural properties are presented for the candidates. The group luminosity function has a faint-end slope characterized by the parameter α = -1.27±0.06. We discuss implications of this dwarf galaxy population for cosmological models.

Abstract Copyright: ∼

Journal keyword(s): galaxies: clusters individual: M81 - galaxies: dwarf - galaxies: fundamental parameters - galaxies: luminosity function, mass function - galaxies: photometry

Nomenclature: Table 1: [CKT2009] dJHHMM+DD N=22.

Simbad objects: 62

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Number of rows : 62
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12650 1
2 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 533 2
3 LBN 659 GiG 02 36 35.4662282832 +59 39 17.507008584   17       ~ 189 2
4 NAME NGC 1400 Group GrG 03 32 16.00 -18 33 54.0           ~ 72 0
5 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 1827 0
6 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1517 1
7 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1789 1
8 2MASX J08352736-5352452 G 08 35 27.367 -53 52 45.22           ~ 2 0
9 LEDA 5056943 LSB 09 26 27.9 +70 30 24           ~ 17 0
10 LEDA 5056931 G 09 34 03.7 +70 12 57           ~ 12 0
11 LEDA 5056932 G 09 39 15.9 +71 18 42           ~ 14 0
12 [MH94a] Ho I 13 HII 09 40 25.9 +71 11 18           ~ 3 0
13 UGC 5139 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 356 1
14 LEDA 5056933 G 09 44 22.5 +69 12 40           ~ 12 0
15 LEDA 5056944 G 09 44 34.4 +71 28 57           ~ 14 0
16 NAME F8D1 G 09 44 47.1 +67 26 19   14.60 13.85     ~ 70 0
17 NAME F6D1 GiG 09 45 10.0 +68 45 54   17.5       ~ 50 0
18 [CKT2009] dJ0946+68 LSB 09 46 13.0 +68 42 55           ~ 4 0
19 NGC 2976 GiP 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 673 1
20 NGC 3007 Sy2 09 47 45.6120987744 -06 26 17.364262668   15   13.00   ~ 19 0
21 LEDA 28529 G 09 53 48.8 +68 58 09   18.89       ~ 93 1
22 NAME M 81-82 Group GrG 09 55 +69.1           ~ 717 0
23 LEDA 5056934 G 09 55 13.6 +70 24 29           ~ 14 0
24 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4450 3
25 M 82 AGN 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5860 6
26 LEDA 28731 G 09 57 03.0 +68 35 31   15.17       ~ 114 1
27 [CKT2009] dJ0957+70 G 09 57 12.4 +70 12 35           ~ 2 0
28 NAME Arp Loop G 09 57 29.0 +69 16 20           ~ 67 1
29 [SPM2005] HoIX-3-1565 Gl? 09 57 32.2 +69 02 39           ~ 3 0
30 UGC 5336 AG? 09 57 32.8632 +69 02 50.735 15.19 15.15 14.10 14.12   ~ 316 4
31 LEDA 28826 G 09 58 49.06 +66 50 53.2   16       ~ 20 0
32 LEDA 5056936 G 09 59 33.1 +68 39 25           ~ 15 0
33 NGC 3077 GiP 10 03 19.0965510921 +68 44 01.556166166 11.23 10.85 10.14 9.74   ~ 771 0
34 NAME Garland G 10 03 43.1 +68 41 32           ~ 64 2
35 LEDA 29231 G 10 04 40.3 +68 15 20   17.43 16.72     ~ 74 0
36 UGC 5428 AG? 10 05 06.40 +66 33 32.0 17.89 16.82 16.09 15.73   ~ 106 1
37 LEDA 5056937 G 10 06 46.2 +67 12 04           ~ 13 0
38 UGC 5442 AG? 10 07 01.90 +67 49 39.0 17.09 15.73 15.07 14.81   ~ 89 1
39 NAME IKN G 10 08 05.9 +68 23 57           ~ 74 0
40 [CKT2009] dJ1009+70 G 10 09 34.9 +70 32 55           ~ 9 0
41 UGC 5497 AG? 10 12 48.017 +64 06 28.52   15.7       ~ 24 0
42 [CKT2009] dJ1013+68 G 10 13 11.7 +68 43 45           ~ 2 0
43 LEDA 5056938 LSB 10 14 55.8 +68 45 27           ~ 16 0
44 LEDA 5056947 G 10 15 06.9 +69 02 15           ~ 13 0
45 [CKT2009] dJ1016+69 G 10 16 18.3 +69 29 45           ~ 2 0
46 [CKT2009] dJ1019+69 G 10 19 52.9 +69 11 19           ~ 5 0
47 [CKT2009] dJ1020+69 G 10 20 25.0 +69 11 50           ~ 2 0
48 LEDA 30664 G 10 26 28.0 +67 39 35   15.8       ~ 81 1
49 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 665 1
50 LEDA 5056941 LSB 10 28 39.7 +70 14 01           ~ 17 1
51 UGC 5692 GiG 10 30 35.03 +70 37 07.2 14.81 13.69 13.01 12.73   ~ 131 0
52 LEDA 31286 G 10 34 31.9 +66 00 42   16.7       ~ 51 1
53 LEDA 5056942 G 10 41 16.8 +70 09 03           ~ 13 0
54 [CKT2009] dJ1048+70 G 10 48 57.0 +70 25 38           ~ 2 0
55 UGC 6456 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 335 1
56 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 400 1
57 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6645 0
58 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 263 0
59 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4486 3
60 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2914 2
61 NAME NGC 5846 Group GrG 15 05 47.0 +01 34 25           ~ 151 0
62 NAME Local Group GrG ~ ~           ~ 8391 0

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