2017ApJ...850..109B

Query : 2017ApJ...850..109B

2017ApJ...850..109B - Astrophys. J., 850, 109-109 (2017/November-3)

Discovery of diffuse dwarf galaxy candidates around M101.

BENNET P., SAND D.J., CRNOJEVIC D., SPEKKENS K., ZARITSKY D. and KARUNAKARAN A.

Abstract (from CDS):

We have conducted a search of a 9 deg2 region of the Canada-France-Hawaii-Telescope Legacy Survey around the Milky Way analog M101 (D ∼ 7 Mpc), in order to look for previously unknown low-surface-brightness galaxies. This search has uncovered 38 new low-surface-brightness dwarf candidates, and confirmed 11 previously reported galaxies, all with central surface brightness µ(g, 0) > 23 mag arcsec–2, potentially extending the satellite luminosity function for the M101 group by ∼1.2 mag. The search was conducted using an algorithm that nearly automates the detection of diffuse dwarf galaxies. The candidates' small sizes and low surface brightnesses mean that the faintest of these objects would likely be missed by traditional visual or computer detection techniques. The dwarf galaxy candidates span a range of -7.1 >= Mg >= -10.2 and half-light radii of 118-540 pc at the distance of M101, and they are well fit by simple Sersic surface brightness profiles. These properties are consistent with dwarfs in the Local Group, and to match the Local Group luminosity function, ∼10-20 of these candidates should be satellites of M101. Association with a massive host is supported by the lack of detected star formation and the overdensity of candidates around M101 compared to the field. The spatial distribution of the dwarf candidates is highly asymmetric, and concentrated to the northeast of M101, therefore distance measurements will be required to determine if these are genuine members of the M101 group.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): cosmology: observations - galaxies: dwarf - galaxies: evolution - surveys - surveys

Nomenclature: Table 1: [BSC2017] Dw NN (Nos 1-38).

Simbad objects: 57

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Number of rows : 57
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 NAME Antlia B G 09 48 56.08 -25 59 24.0           ~ 41 0
3 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 268 0
4 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
5 [BSC2017] Dw 9 LSB 13 55 44.6 +55 08 45           ~ 11 0
6 [BSC2017] Dw 37 LSB 13 56 09.7 +54 25 43           ~ 1 0
7 [BSC2017] Dw 18 LSB 13 58 52.3 +55 29 27           ~ 1 0
8 MATLAS-1686 LSB 13 59 13.1 +55 35 38           ~ 2 0
9 [BSC2017] Dw 38 LSB 14 01 17.6 +54 21 14           ~ 2 0
10 MATLAS-1691 LSB 14 01 40.3 +55 00 57           ~ 5 0
11 MATLAS-1692 LSB 14 02 20.0 +55 39 19           ~ 6 0
12 [BSC2017] Dw 36 LSB 14 02 27.7 +54 58 59           ~ 1 0
13 NAME M101 Group GrG 14 03 +54.3           ~ 112 1
14 MATLAS-1696 LSB 14 03 03.2 +54 47 12           ~ 3 0
15 [MVA2014] DF 3 LSB 14 03 05.7 +53 36 56   17.9       ~ 21 0
16 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
17 MATLAS-1698 LSB 14 03 37.8 +55 39 52           ~ 2 0
18 SMDG J1403450+535638 LSB 14 03 45.0 +53 56 40   18.9       ~ 21 0
19 MATLAS-1703 LSB 14 04 13.0 +55 43 35           ~ 4 0
20 [KRZ2015] M 101 dwD LSB 14 04 24.6 +53 16 19   19.2       ~ 7 0
21 MATLAS-1704 LSB 14 04 24.8 +55 06 14           ~ 6 0
22 [MVA2014] DF 5 LSB 14 04 28.1 +55 37 00           ~ 9 0
23 MATLAS-1708 LSB 14 05 18.1 +54 53 52   20.2       ~ 9 0
24 [BSC2017] Dw 35 LSB 14 05 36.2 +54 49 02           ~ 2 0
25 [MVA2014] DF 7 LSB 14 05 47.50 +55 07 57.3   20.4       ~ 13 0
26 [BSC2017] Dw 24 LSB 14 06 48.0 +54 23 36           ~ 2 0
27 SMDG J1406499+534430 LSB 14 06 49.9 +53 44 30   19.2       ~ 17 0
28 [BSC2017] Dw 23 LSB 14 07 08.4 +54 33 49           ~ 2 0
29 NGC 5485 LIN 14 07 11.3594809920 +55 00 06.084219996 14.34 13.82 12.22     ~ 267 0
30 MATLAS-1730 LSB 14 07 21.0 +55 03 51           ~ 7 0
31 [MVA2014] DF 4 LSB 14 07 33.80 +54 42 39.2   18.8       ~ 14 0
32 MATLAS-1741 LSB 14 07 41.7 +54 35 19           ~ 6 0
33 SMDG J1407464+541525 LSB 14 07 46.4 +54 15 26           ~ 4 0
34 [BSC2017] Dw 21 LSB 14 07 56.5 +54 56 03           ~ 3 0
35 [BSC2017] Dw 13 LSB 14 08 01.2 +54 22 30           ~ 3 0
36 SMDG J1408087+533546 LSB 14 08 08.7 +53 35 45           ~ 3 0
37 [BSC2017] Dw 29 LSB 14 08 09.9 +55 04 33           ~ 1 0
38 [MVA2014] DF 6 LSB 14 08 18.70 +55 11 30.6   20.1       ~ 11 0
39 MATLAS-1752 LSB 14 08 33.7 +55 26 50           ~ 4 0
40 SMDG J1408374+541932 LSB 14 08 37.5 +54 19 31   19.8       ~ 20 0
41 MATLAS-1754 LSB 14 08 43.7 +55 10 02   20.1       ~ 9 0
42 MATLAS-1755 LSB 14 08 45.8 +55 17 13           ~ 6 0
43 MATLAS-1756 LSB 14 08 46.2 +55 05 02           ~ 3 0
44 [BSC2017] Dw 26 LSB 14 08 50.4 +53 27 24           ~ 3 0
45 [BSC2017] Dw 15 LSB 14 09 17.5 +53 45 30           ~ 3 0
46 MATLAS-1765 LSB 14 09 21.9 +55 18 15           ~ 3 0
47 [BSC2017] Dw 12 LSB 14 09 26.0 +54 14 51           ~ 2 0
48 [BSC2017] Dw 25 LSB 14 09 47.5 +54 02 55           ~ 1 0
49 [BSC2017] Dw 20 LSB 14 10 01.6 +54 25 11           ~ 2 0
50 [BSC2017] Dw 11 LSB 14 10 04.8 +54 15 29           ~ 4 0
51 MATLAS-1774 LSB 14 10 20.0 +54 45 50           ~ 3 0
52 SMDG J1410597+555328 LSB 14 10 59.7 +55 53 29           ~ 4 0
53 [BSC2017] Dw 14 LSB 14 11 03.2 +53 56 50           ~ 4 0
54 [BSC2017] Dw 27 LSB 14 12 22.9 +54 31 00           ~ 1 0
55 SMDG J1413016+551117 LSB 14 13 01.7 +55 11 16           ~ 5 0
56 [BSC2017] Dw 34 LSB 14 13 23.1 +54 04 52           ~ 1 0
57 NAME Local Group GrG ~ ~           ~ 9325 0

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