2017ApJ...846...26S

Query : 2017ApJ...846...26S

2017ApJ...846...26S - Astrophys. J., 846, 26-26 (2017/September-1)

Deep imaging of the HCG 95 field. I. Ultra-diffuse galaxies.

SHI D.D., ZHENG X.Z., ZHAO H.B., PAN Z.Z., LI B., ZOU H., ZHOU X., GUO K., AN F.X. and LI Y.B.

Abstract (from CDS):

We present a detection of 89 candidates of ultra-diffuse galaxies (UDGs) in a 4.9 degree2 field centered on the Hickson Compact Group 95 (HCG 95) using deep g- and r-band images taken with the Chinese Near Object Survey Telescope. This field contains one rich galaxy cluster (Abell 2588 at z = 0.199) and two poor clusters (Pegasus I at z = 0.013 and Pegasus II at z = 0.040). The 89 candidates are likely associated with the two poor clusters, giving about 50-60 true UDGs with a half-light radius re 1.5 kpc and a central surface brightness µ(g,0) 24.0 mag arcsec–2. Deep z′ -band images are available for 84 of the 89 galaxies from the Dark Energy Camera Legacy Survey (DECaLS), confirming that these galaxies have an extremely low central surface brightness. Moreover, our UDG candidates are spread over a wide range in g - r color, and ∼26% are as blue as normal star-forming galaxies, which is suggestive of young UDGs that are still in formation. Interestingly, we find that one UDG linked with HCG 95 is a gas-rich galaxy with H I mass 1.1×109M☉ detected by the Very Large Array, and has a stellar mass of M*∼1.8×108M☉. This indicates that UDGs at least partially overlap with the population of nearly dark galaxies found in deep H I surveys. Our results show that the high abundance of blue UDGs in the HCG 95 field is favored by the environment of poor galaxy clusters residing in H i-rich large-scale structures.

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

Journal keyword(s): galaxies: evolution - galaxies: groups: individual: HCG 95 - galaxies: structure - galaxies: structure

Nomenclature: Table 3: [SZZ2017] PegI-LSBGNN (Nos 1-32), [SZZ2017] PegI-UDGNN (Nos 1-12), [SZZ2017] PegII-UDGNN (Nos 1-45).

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

CDS comments: HCG 95e is not in SIMBAD.

Simbad objects: 58

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Number of rows : 58
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 HCG 7 CGG 00 39 15.9 +00 53 17   11.4       ~ 87 0
2 AGC 113790 LSB 01 13 02.158 +27 38 11.44           ~ 10 0
3 ACO 168 ClG 01 15 07.58 +00 19 10.8           ~ 379 2
4 NAME DGSAT I G 01 17 35.590 +33 31 42.37           ~ 48 0
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
6 AGC 113949 LSB 01 49 38.6 +30 40 51           ~ 8 0
7 AGC 122966 LSB 02 09 29.0 +31 51 10           ~ 14 0
8 NAME Psc-Per Supercluster SCG 02 33.2 +41 37           ~ 444 1
9 MCG+00-07-077 EmG 02 40 23.09 +01 13 45.3   16.1   15.6 16.0 ~ 67 0
10 HCG 25 CGG 03 20 43.7 -01 03 07     13.6     ~ 62 0
11 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
12 HCG 44 CGG 10 18 00 +21 48.7           ~ 86 0
13 LEDA 41311 LSB 12 30 23.8 +13 58 56   20       ~ 83 0
14 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
15 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
16 SMDG J1300580+265835 LSB 13 00 57.996 +26 58 34.72     19.37 18.43   ~ 145 0
17 GMP 2175 LSB 13 01 15.845 +27 12 38.62     19.41 18.58   ~ 47 0
18 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
19 ZwCl 2307+0713 ClG 23 10 26.6 +07 35 13           ~ 60 0
20 NGC 7529 AG? 23 14 03.208 +08 59 33.11   14.6       ~ 44 0
21 NGC 7528 G 23 14 20.2616044200 +10 13 53.198012100           ~ 12 0
22 NGC 7542 G 23 14 41.6366949432 +10 38 35.732946048   15.7       ~ 11 0
23 NGC 7569 AG? 23 16 44.5361951424 +08 54 20.317228488   14.8       ~ 33 0
24 NGC 7586 G 23 17 39.2 +08 15 10           ~ 11 0
25 NGC 7579 G 23 17 40.8287319288 +09 24 35.090932572   15.4       ~ 6 0
26 NGC 7584 G 23 17 53.1 +09 25 59   15.3       ~ 9 0
27 LEDA 1349697 G 23 17 55.5893072712 +08 35 02.628489840           ~ 9 0
28 NGC 7587 GiP 23 17 59.1366833712 +09 40 48.554045184   13.35 12.06     ~ 25 0
29 IC 5305 G 23 18 06.2190373032 +10 17 59.393548356   15.4       ~ 15 0
30 IC 5306 PaG 23 18 11.3159799864 +10 14 45.831780672   15.6       ~ 8 0
31 NGC 7594 G 23 18 13.9141415760 +10 17 54.130035876   15.3       ~ 36 0
32 IC 5307 G 23 18 22.0244273352 +10 14 08.565076932           ~ 10 0
33 NGC 7595 G 23 18 30.2067262296 +09 55 56.450295624           ~ 11 0
34 NGC 7601 G 23 18 47.0851118352 +09 14 01.440363372   14.7       ~ 31 0
35 IC 5309 GiG 23 19 11.638 +08 06 33.58   15.0       ~ 132 0
36 NGC 7608 GiG 23 19 15.337 +08 21 00.59   15.2       ~ 87 0
37 NGC 7616 G 23 19 27.246 +10 09 15.57   16.5       ~ 8 0
38 MCG+01-59-046 G 23 19 27.8359540728 +09 29 40.355871360   16.38 15.38 14.66   ~ 46 0
39 HCG 95f GiG 23 19 29.0 +09 33 31           ~ 2 0
40 NGC 7609 IG 23 19 30.0445916616 +09 30 29.844638928   15.23 14.29 13.43   ~ 69 0
41 VV 20b G 23 19 31.1134732704 +09 30 11.002447872   17.23 16.14 15.37   ~ 34 0
42 HCG 95 CGG 23 19 32 +09 29.5           ~ 59 0
43 Z 406-67 G 23 19 33.787 +09 29 41.56   16.12 15.22 14.63   ~ 41 0
44 NGC 7611 GiG 23 19 36.5915702280 +08 03 48.102500664   14.0       ~ 77 0
45 NGC 7610 GiC 23 19 41.3871631752 +10 11 06.003153168   14.9       ~ 102 0
46 NGC 7612 GiG 23 19 44.2115813880 +08 34 34.873328280   14.3       ~ 56 0
47 NGC 7615 GiG 23 19 54.441 +08 23 57.92   15.3       ~ 33 0
48 NGC 7617 GiG 23 20 08.9642089560 +08 09 56.684464488   15.1       ~ 71 0
49 NGC 7619 GiG 23 20 14.524 +08 12 22.63   12.7       ~ 472 0
50 NGC 7621 AG? 23 20 24.6111828504 +08 21 59.080709952   15.5       ~ 11 0
51 NGC 7623 GiG 23 20 30.0039351816 +08 23 44.814596208   13.9       ~ 88 0
52 NGC 7626 rG 23 20 42.524 +08 13 01.43   12.8       ~ 438 1
53 NAME Peg I ClG 23 21 +08.3           ~ 71 0
54 NGC 7631 GiG 23 21 26.6685629592 +08 13 03.560510496   13.8       ~ 160 0
55 NGC 7634 GiG 23 21 41.7480972864 +08 53 12.846456708   13.7       ~ 84 0
56 ACO 2588 ClG 23 23 38.8 +09 08 50           ~ 20 0
57 NGC 7648 GiG 23 23 54.031 +09 40 02.85   13.5       ~ 87 1
58 HCG 98 CGG 23 54 11.990 +00 22 20.17           ~ 39 0

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