2016A&A...596A..23S


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST04:27:55

2016A&A...596A..23S - Astronomy and Astrophysics, volume 596A, 23-23 (2016/12-1)

Stellar systems in the direction of the Hickson Compact Group 44. I. Low surface brightness galaxies.

SMITH CASTELLI A.V., FAIFER F.R. and ESCUDERO C.G.

Abstract (from CDS):

Context. In spite of the numerous studies of low-luminosity galaxies in different environments, there is still no consensus about their formation scenario. In particular, a large number of galaxies displaying extremely low-surface brightnesses have been detected in the last year, and the nature of these objects is under discussion.
Aims. In this paper we report the detection of two extended low-surface brightness (LSB) objects (µeffg'~=27mag) found, in projection, next to NGC 3193 and in the zone of the Hickson Compact Group (HCG) 44, respectively.
Methods. We analyzed deep, high-quality, GEMINI-GMOS images with ELLIPSE within IRAF in order to obtain their brightness profiles and structural parameters. We also searched for the presence of globular clusters (GC) in these fields.
Results. We have found that, if these LSB galaxies were at the distances of NGC 3193 and HCG 44, they would show sizes and luminosities similar to those of the ultra-diffuse galaxies (UDGs) found in the Coma cluster and other associations. In that case, their sizes would be rather larger than those displayed by the Local Group dwarf spheroidal (dSph) galaxies. We have detected a few unresolved sources in the sky zone occupied by these galaxies showing colors and brightnesses typical of blue globular clusters.
Conclusions. From the comparison of the properties of the galaxies presented in this work with those of similar objects reported in the literature, we have found that LSB galaxies display sizes covering a quite extended continous range (reff∼0.3-4.5kpc), in contrast to "normal" early-type galaxies, which show reff∼1.0kpc with a low dispersion. This fact might point to different formation processes for both types of galaxies.

Abstract Copyright: © ESO, 2016

Journal keyword(s): methods: observational - techniques: photometric - galaxies: groups: individual: HCG 44 - galaxies: dwarf - galaxies: star clusters: general

Nomenclature: Table 3: [SFE2016] dSphN (Nos dSph1-dSph2). Table 4: [SFE2016] dSph1 N (Nos 1-7). Table 5: [SFE2016] dSph2 N (Nos 1-6).

Simbad objects: 32

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Number of rows : 32

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1538 0
2 NAME M 81-82 Group GrG 09 55 +69.1           ~ 634 0
3 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3962 5
4 NAME IKN G 10 08 05.9 +68 23 57           ~ 61 0
5 LEDA 86788 G 10 17 23.290 +21 47 57.98   15.95       ~ 13 0
6 NGC 3185 GiP 10 17 38.5632620545 +21 41 17.601414448   12.99 12.17 12.37   ~ 257 1
7 NGC 3187 GiP 10 17 47.8695015096 +21 52 24.005791156 13.71 13.91 13.44 14.06   ~ 144 1
8 [SFE2016] dSph2 4 ? 10 17 54.737 +21 44 50.96           ~ 1 0
9 [SFE2016] dSph2 3 ? 10 17 55.059 +21 44 55.35           ~ 1 0
10 [SFE2016] dSph2 5 ? 10 17 55.082 +21 44 43.53           ~ 1 0
11 [SFE2016] dSph2 1 ? 10 17 56.033 +21 45 22.65           ~ 1 0
12 [SFE2016] dSph2 2 ? 10 17 56.471 +21 44 47.96           ~ 1 0
13 [SFE2016] dSph2 6 ? 10 17 56.548 +21 44 13.19           ~ 1 0
14 [SFE2016] dSph2 G 10 17 58.0 +21 44 53           ~ 1 0
15 HCG 44 CGG 10 18 00 +21 48.7           ~ 76 0
16 NGC 3189 GiP 10 18 05.643 +21 49 54.98 12.60 12.12 11.15 11.14   ~ 356 2
17 NGC 3193 GiP 10 18 24.884 +21 53 38.32 12.29 11.83 10.88 12.19   ~ 268 1
18 [SFE2016] dSph1 5 ? 10 18 29.236 +21 53 46.98           ~ 1 0
19 [SFE2016] dSph1 6 ? 10 18 29.772 +21 53 35.16           ~ 1 0
20 [SFE2016] dSph1 1 ? 10 18 29.874 +21 53 51.45           ~ 1 0
21 [SFE2016] dSph1 7 ? 10 18 29.954 +21 53 21.78           ~ 1 0
22 [SFE2016] dSph1 2 ? 10 18 30.18400 +21 53 46.9000           ~ 1 0
23 [SFE2016] dSph1 3 ? 10 18 30.603 +21 53 43.73           ~ 1 0
24 [SFE2016] dSph1 4 ? 10 18 30.864 +21 53 40.95           ~ 1 0
25 [SFE2016] dSph1 G 10 18 31.0 +21 53 41           ~ 1 0
26 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5824 0
27 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4208 2
28 NAME NGC 5044 Group GrG 13 14 22.7 -16 32 04           ~ 169 0
29 NGC 5044 BiC 13 15 23.969 -16 23 08.00   11.9   10.74   ~ 451 0
30 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2228 2
31 NAME Galactic Center Spur Rad 16 41 -39.1           ~ 12 1
32 NAME Local Group GrG ~ ~           ~ 6970 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-04:27:55

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