2017A&A...602A.119M

Query : 2017A&A...602A.119M

2017A&A...602A.119M - Astronomy and Astrophysics, volume 602A, 119-119 (2017/6-1)

The M 101 group complex: new dwarf galaxy candidates and spatial structure.

MULLER O., SCALERA R., BINGGELI B. and JERJEN H.

Abstract (from CDS):

Context. The fine details of the large-scale structure in the local Universe provide important empirical benchmarks for testing cosmological models of structure formation. Dwarf galaxies are key object for such studies.
Aims. Our aim was to enlarge the sample of known dwarf galaxies in the local Universe. We performed a search for faint unresolved low-surface-brightness dwarf galaxies in the M 101 group complex, including the region around the major spiral galaxies M 101, M 51, and M 63 lying at a distance of 7.0, 8.6, and 9.0Mpc, respectively. The new dwarf galaxy sample can be used in a first step to test for significant substructure in the 2D distribution and in a second step to study the spatial distribution of the galaxy complex.
Methods. Using filtering algorithms we surveyed 330 square degrees of imaging data obtained from the Sloan Digital Sky Survey. The images were visually inspected. The spatial distribution of known galaxies and candidates was analyzed and the system transformed into a M 101 eigenframe using the geometrical alignment of the group.
Results. We discovered 15 new dwarf galaxies and carried out surface photometry in the g and r bands. The similarity of the photometric properties of these dwarfs to those of Local Group dwarfs suggest membership to the M 101 group complex. The sky distribution of the candidates follows the thin planar structure outlined by the known members of the three subgroups. The ∼3Mpc long filamentary structure has a rms thickness of 67kpc. The planar structure of the embedded M 101 subgroup is even thinner, with rms=46kpc. The formation of this structure might be due to the expansion of the bordering Local Void. Other implications are discussed as well.
Conclusions. We show the viability of SDSS data to extend the sample of dwarfs in the local Universe and test cosmological models on small scales.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: dwarf - galaxies: groups: individual: M 101 group - galaxies: photometry - large-scale structure of Universe - large-scale structure of Universe

Nomenclature: Figs 2+4, Tables 1-2: [MSB2017] dwHHMM+DD N=6+4+5.

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 - 2024 		#notes
1 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12651 1
2 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3337 2
3 NAME Sculptor Dwarf Galaxy G 01 00 09.4 -33 42 32   9.79 8.6 8.81   ~ 1360 4
4 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1517 1
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     ~ 4450 3
7 Mrk 33 AG? 10 32 31.956 +54 24 03.53 13.29 13.66 13.13 12.71 12.27 ~ 368 1
8 NAME CVn I Group GrG 12 32 48.3 +33 57 07           ~ 142 0
9 ACO 3526 ClG 12 48 51.8 -41 18 21           ~ 1068 2
10 M 94 SyG 12 50 53.0737971432 +41 07 12.900884628 9.15 8.96 8.24 7.78   ~ 1386 2
11 [MSB2017] dw1255+40 G? 12 55 02.49 +40 35 21.9           ~ 6 0
12 [MSB2017] dw1303+42 G? 13 03 14.0 +42 22 17           ~ 2 0
13 [MSB2017] dw1305+41 G? 13 05 29.0 +41 53 24           ~ 3 0
14 [MSB2017] dw1305+38 G? 13 05 58.0 +38 05 43           ~ 3 0
15 [MSB2017] dw1308+40 G? 13 08 46.0 +40 54 04           ~ 3 0
16 NGC 5023 EmG 13 12 11.8036148808 +44 02 17.328663600   13.2       ~ 256 0
17 [MSB2017] dw1313+46 G? 13 13 02.0 +46 36 08           ~ 3 0
18 LEDA 166159 G 13 13 39.7 +42 02 35   18.51   17.22   ~ 18 0
19 M 63 LIN 13 15 49.2741893928 +42 01 45.728076108   9.34 8.59 8.35   ~ 1224 2
20 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 263 0
21 NAME Centaurus A Sy2 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4486 3
22 [MSB2017] dw1327+51 G? 13 27 01.0 +51 41 08           ~ 3 0
23 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4330 4
24 NGC 5195 GiP 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 778 3
25 NAME NGC 5236 Group GrG 13 37 06 -29 51.9           ~ 64 0
26 [MSB2017] dw1338+50 G? 13 38 49.0 +50 01 10           ~ 3 0
27 [MSB2017] dw1340+45 G? 13 40 37.0 +45 41 54           ~ 3 0
28 UGC 8683 AG? 13 42 32.520 +39 39 30.60   15.7       ~ 41 0
29 LEDA 2576103 G 13 43 07.27944 +58 13 39.9504           ~ 10 0
30 UGC 8837 AG? 13 54 45.602 +53 54 20.06   14.2       ~ 207 0
31 [MSB2017] dw1355+51 G? 13 55 11.0 +51 54 29           ~ 4 0
32 UGC 8882 LSB 13 57 14.6983598016 +54 06 03.171260340   16.0       ~ 25 0
33 NAME M101 Group GrG 14 03 +54.3           ~ 102 1
34 [MVA2014] DF 3 LSB 14 03 05.7 +53 36 56   17.9       ~ 19 0
35 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2915 2
36 [MVA2014] DF 1 LSB 14 03 45.0 +53 56 40   18.9       ~ 17 0
37 [MVA2014] DF 5 LSB 14 04 28.1 +55 37 00           ~ 9 0
38 NGC 5473 GiG 14 04 43.2276404712 +54 53 33.499699368   12.5       ~ 145 0
39 NGC 5474 GiP 14 05 01.608 +53 39 43.95   11.28 10.79     ~ 443 1
40 NGC 5477 AG? 14 05 33.318 +54 27 37.85 13.94 14.36 14.01     ~ 209 1
41 [MVA2014] DF 7 LSB 14 05 47.50 +55 07 57.3   20.4       ~ 12 0
42 NGC 5485 LIN 14 07 11.3594809920 +55 00 06.084219996 14.34 13.82 12.22     ~ 250 0
43 [MVA2014] DF 4 LSB 14 07 33.80 +54 42 39.2   18.8       ~ 14 0
44 [MVA2014] DF 6 LSB 14 08 18.70 +55 11 30.6   20.1       ~ 11 0
45 [MVA2014] DF 2 LSB 14 08 37.5 +54 19 31   19.8       ~ 17 0
46 [MSB2017] dw1408+56 G? 14 08 41.0 +56 55 38           ~ 4 0
47 [MSB2017] dw1412+56 G? 14 12 11.0 +56 08 31           ~ 5 0
48 LEDA 50911 G 14 15 08.593 +57 05 30.99   16.5       ~ 34 0
49 [MSB2017] dw1416+57 G? 14 16 59.0 +57 54 39           ~ 4 0
50 NGC 5585 GiG 14 19 48.204 +56 43 44.58   11.73 11.216 11.12 10.123 ~ 430 0
51 NGC 5633 EmG 14 27 28.3616823288 +46 08 47.521403916   13.176 12.932 12.449 11.575 ~ 182 0
52 UGC 9405 AG? 14 35 24.077 +57 15 21.24   17       ~ 86 0
53 [MSB2017] dw1446+58 G? 14 47 00.0 +58 34 04           ~ 4 0
54 NGC 6052 AG? 16 05 12.8715178104 +20 32 32.607297132 13.01 13.44 13.00     ~ 351 2
55 NAME Local Void vid 18 38 +18.0           ~ 199 0
56 NAME Local Group GrG ~ ~           ~ 8393 0
57 NAME Com-Scl Cluster ClG ~ ~           ~ 10 0

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