2017A&A...597A...7M

Query : 2017A&A...597A...7M

2017A&A...597A...7M - Astronomy and Astrophysics, volume 597A, 7-7 (2017/1-1)

New low surface brightness dwarf galaxies in the Centaurus group.

MULLER O., JERJEN H. and BINGGELI B.

Abstract (from CDS):

Context. The distribution of satellite galaxies around the Milky Way and Andromeda and their correlation in phase space pose a major challenge to the standard ΛCDM model of structure formation. Other nearby groups of galaxies are now being scrutinized to test for the ubiquity of the phenomenon.
Aims. We conducted an extensive CCD imaging survey for faint, unresolved dwarf galaxies of very low surface brightness in the whole Centaurus group region, encompassing the Cen A and M 83 subgroups lying at a distance of roughly 4 and 5Mpc, respectively. The aim is to significantly increase the sample of known Centaurus group members down to a fainter level of completeness, serving as a basis for future studies of the 3D structure of the group.
Methods. Following our previous survey of 60 square degrees covering the M 83 subgroup, we extended and completed our survey of the Centaurus group region by imaging another 500 square degrees area in the g and r bands with the wide-field Dark Energy Survey camera at the 4m Blanco telescope at CTIO. The surface brightness limit reached for unresolved dwarf galaxies is µr~=29mag/arcsec2. The faintest suspected Centaurus members found have mr~=19.5mag or Mr~=-8.8mag at the mean distance of the group. The images were enhanced using different filtering techniques.
Results. We found 41 new dwarf galaxy candidates, which together with the previously discovered 16 dwarf candidates in the M 83 subgroup amounts to almost a doubling of the number of known galaxies in the Centaurus complex, if the candidates are confirmed. We carried out surface photometry in g and r, and report the photometric parameters derived therefrom, for all new candidates as well as previously known members in the surveyed area. The photometric properties of the candidates, when compared to those of Local Group dwarfs and previously known Centaurus dwarfs, suggest membership in the Centaurus group. The sky distribution of the new objects is generally following a common envelope around the Cen A and M 83 subgroups. How the new dwarfs are connected to the intriguing double-planar feature recently reported must await distance information for the candidates.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: dwarf - galaxies: individual: Centaurus group - galaxies: photometry

Nomenclature: Table 1: [MJB2015] dwDDMM+DDa N=25 added.

Simbad objects: 77

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Number of rows : 77
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     ~ 12645 1
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3336 2
3 NAME Scl Group GrG 01 00 06 -33 44.2           ~ 509 0
4 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1359 4
5 NAME M 81-82 Group GrG 09 55 +69.1           ~ 717 0
6 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4449 3
7 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6643 0
8 [MJB2015] dw1240-42 LSB 12 40 02.0 -42 24 44           ~ 3 0
9 [MJB2015] dw1241-32 LSB 12 41 27.0 -42 53 45           ~ 3 0
10 [MJB2015] dw1243-42b LSB 12 43 11.0 -42 26 37           ~ 4 0
11 [MJB2015] dw1243-42 LSB 12 43 13.0 -42 27 48           ~ 4 0
12 LEDA 2815819 G 12 44 21.5 -42 56 23   16.7       ~ 14 0
13 ESO 381-18 EmG 12 44 42.39 -35 58 00.2   15.79   14.84 15.1 ~ 56 0
14 ESO 381-20 AG? 12 46 00.67 -33 50 13.0   14.24   13.50 14.0 ~ 88 0
15 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 1066 2
16 [MJB2015] dw1251-40 LSB 12 51 56.0 -40 19 53           ~ 4 0
17 [MJB2015] dw1252-40 LSB 12 52 01.0 -40 21 55           ~ 4 0
18 [MJB2015] dw1252-43 LSB 12 52 25.0 -43 05 58           ~ 3 0
19 ESO 443-9 AG? 12 54 53.3144 -28 20 21.770   17.01   16.35   ~ 41 0
20 [MJB2015] dw1257-41 LSB 12 57 45.0 -41 22 52           ~ 3 0
21 [MJB2015] dw1258-37 LSB 12 58 29.0 -37 07 21           ~ 3 0
22 [MJB2015] dw1301-30 LSB 13 01 28.0 -30 06 43           ~ 3 0
23 [MJB2015] dw1302-40 LSB 13 02 49.0 -40 08 35           ~ 3 0
24 LEDA 166152 AG? 13 05 02.8154 -40 04 58.706   16.0   16.2 16.0 ~ 60 0
25 [MJB2015] dw1306-29 LSB 13 06 48.0 -29 53 30           ~ 3 0
26 MCG-04-31-038 EmG 13 09 36.60 -27 08 26.7   14.5   16.01 14.7 ~ 26 0
27 LEDA 2815820 G 13 11 14.1 -38 54 22   17.3       ~ 16 0
28 LEDA 166158 G 13 12 45.2 -41 49 57   19.3       ~ 37 0
29 ESO 269-66 GiC 13 13 09.2 -44 53 23   14.14       ~ 60 0
30 ESO 269-68 GiC 13 13 11.88 -43 15 55.7   14.25       ~ 30 1
31 [MJB2015] dw1314-28 LSB 13 14 02.0 -28 12 12           ~ 3 0
32 [MJB2015] dw1315-45 LSB 13 15 56.0 -45 45 02           ~ 5 0
33 [MJB2015] dw1318-21 LSB 13 18 04.0 -21 53 06           ~ 4 0
34 [MJB2015] dw1318-44 LSB 13 18 58.0 -44 53 41           ~ 4 0
35 [MJB2015] dw1321-27 LSB 13 21 08.0 -27 44 56           ~ 3 0
36 LEDA 166163 G 13 21 08.5 -31 31 50   17.4       ~ 56 0
37 LEDA 2815821 G 13 21 32.4 -31 53 11   17.6       ~ 20 0
38 NGC 5101 Sy1 13 21 46.242 -27 25 49.87   11.26 10.47 9.87 10.5 ~ 182 0
39 LEDA 46663 AG? 13 21 47.40 -45 03 42.0           ~ 60 0
40 LEDA 46680 G 13 22 02.1 -42 32 10   16.6       ~ 57 0
41 [MJB2015] dw1322-27 LSB 13 22 06.0 -27 34 45           ~ 3 0
42 LEDA 2815822 G 13 22 12.7 -42 43 41   18.5       ~ 38 0
43 [MJB2015] dw1322-39 LSB 13 22 32.0 -39 54 22           ~ 8 0
44 LEDA 166164 G 13 22 56.2 -33 34 22   17.6       ~ 27 0
45 LEDA 3097728 G 13 23 29.9 -23 23 35           ~ 12 0
46 [MJB2015] dw1323-40c LSB 13 23 37.0 -40 43 17           ~ 4 0
47 [MJB2015] dw1323-40b LSB 13 23 55.0 -40 50 09           ~ 8 0
48 LEDA 46885 GiC 13 24 36.23 -30 58 18.5   16.67   17.33   ~ 57 1
49 [MJB2015] dw1323-40 LSB 13 24 53.0 -40 45 41           ~ 8 0
50 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4484 3
51 [MJB2015] dw1326-37 LSB 13 26 22.0 -37 23 08           ~ 4 0
52 [MJB2015] dw1329-45 LSB 13 29 10.0 -45 10 31           ~ 5 0
53 [MJB2015] dw1331-37 LSB 13 31 32.0 -37 03 29           ~ 4 0
54 [MJB2015] dw1336-44 LSB 13 36 44.0 -44 26 50           ~ 5 0
55 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2572 2
56 [MJB2015] dw1337-44 LSB 13 37 34.0 -44 13 07           ~ 4 0
57 [MJB2015] dw1341-43 LSB 13 41 37.0 -43 51 17           ~ 8 0
58 LEDA 2815823 G 13 41 38.1 -42 34 55   18.1       ~ 28 0
59 LEDA 48515 G 13 42 05.7 -45 12 20   17.6       ~ 48 1
60 [MJB2015] dw1342-43 LSB 13 42 44.0 -43 15 19           ~ 8 0
61 LEDA 166172 G 13 43 36.0 -43 46 11           ~ 31 1
62 ESO 325-11 AG? 13 45 01.0528 -41 51 45.993   14.02   13.49 12.9 ~ 106 0
63 LEDA 166176 GiG 13 46 40.4 -29 58 41   19       ~ 23 0
64 LEDA 4614882 AG? 13 48 33.9801 -37 58 03.811           ~ 35 0
65 NAME TR 1346-35 EmG 13 49 17.5109711256 -36 03 48.860478360   11.00   10.11   ~ 111 1
66 [MJB2015] dw1357-28 LSB 13 57 00.0 -28 55 15           ~ 3 0
67 ESO 384-16 AG? 13 57 01.37 -35 19 58.7   14.80   14.10 14.81 ~ 58 0
68 [MJB2015] dw1401-32 LSB 14 01 25.0 -32 37 46           ~ 3 0
69 NAME M101 Group GrG 14 03 +54.3           ~ 102 1
70 [MJB2015] dw1403-33 LSB 14 03 18.0 -33 24 14           ~ 3 0
71 [MJB2015] dw1406-29 LSB 14 06 41.0 -29 08 10           ~ 3 0
72 [MJB2015] dw1409-33 LSB 14 09 03.0 -33 49 40           ~ 3 0
73 [MJB2015] dw1410-34 LSB 14 10 47.0 -34 52 07           ~ 3 0
74 [MJB2015] dw1413-34 LSB 14 13 08.0 -34 23 33           ~ 3 0
75 [MJB2015] dw1415-32 LSB 14 15 41.0 -32 34 21           ~ 3 0
76 NAME Local Void vid 18 38 +18.0           ~ 198 0
77 NAME Local Group GrG ~ ~           ~ 8389 0

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