2023ApJ...954L..39F

Query : 2023ApJ...954L..39F

2023ApJ...954L..39F - Astrophys. J., 954, L39 (2023/September-2)

The Disturbed and Globular-cluster-rich Ultradiffuse Galaxy UGC 9050-Dw1.

FIELDER C.E., JONES M.G., SAND D.J., BENNET P., CRNOJEVIC D., KARUNAKARAN A., MUTLU-PAKDIL B. and SPEKKENS K.

Abstract (from CDS):

We investigate the ultradiffuse galaxy (UDG) UGC 9050-Dw1, which was selected because of its disturbed morphology as part of a larger sample of UDGs that display evidence for significant interactions. We use the Hubble Space Telescope's Advanced Camera for Surveys to identify globular clusters (GCs) associated with UGC 9050-Dw1, and the Jansky Very Large Array to measure its H I content. UGC 9050-Dw1, a neighbor to the low surface brightness spiral UGC 9050, exhibits a unique UV-bright central “clump” with clearly associated H I gas and an extended stellar tidal plume to the north. We identify 52 ± 12 GCs, implying a specific frequency of SN = 122 ± 38, one of the highest reported for a UDG of this luminosity ($\mathrm{log}{L}_{V}/{L}_{\odot }=7.5\pm 0.1$). Additionally, ∼20% of the total light of the galaxy is contributed by GCs. Nearly uniform GC colors suggest they were formed during a single intense episode of star formation. We posit that UGC 9050-Dw1 represents the initial definitive observational example of UDG formation resulting from a dwarf merger event, where subsequent clumpy star formation has contributed to its present observed characteristics.

Abstract Copyright: © 2023. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Galaxy interactions - Low surface brightness galaxies - Dwarf galaxies - Tidal tails - Globular star clusters - H I line emission - Galaxy formation

Nomenclature: Fig. 1, Tables 1+A1: [FJS2023] UGC 9050-Dw1 N=1. Fig. 1, Table A2: [FJS2023] UGC 9050-Dw1 NN (Nos 1-30).

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 21

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Number of rows : 21
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 NAME DGSAT I G 01 17 35.590 +33 31 42.37           ~ 48 0
2 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 NAME Psc-Per Supercluster SCG 02 33.2 +41 37           ~ 444 1
4 SMDG J0239150-080657 LSB 02 39 15.11 -08 06 58.6     16.5   16.2 ~ 116 0
5 NAME NGC 1052 Group GrG 02 41 09.3 -08 07 10           ~ 90 0
6 LEDA 3097693 LSB 02 41 46.80 -08 24 09.3     16.2   15.8 ~ 183 0
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
9 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 905 1
10 LEDA 41311 LSB 12 30 23.8 +13 58 56   20       ~ 83 0
11 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
12 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
13 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
14 SMDG J1300580+265835 LSB 13 00 57.996 +26 58 34.72     19.37 18.43   ~ 145 0
15 SMDG J1301582+275012 LSB 13 01 58.205 +27 50 11.91     19.89 19.45   ~ 61 0
16 NGC 5480 AG? 14 06 21.522 +50 43 29.99   12.6       ~ 224 1
17 NGC 5481 AG? 14 06 41.2682134344 +50 43 23.823257124   13.5       ~ 136 0
18 UGC 9050 LSB 14 08 30.056 +51 13 10.88   17       ~ 14 0
19 [FJS2023] UGC 9050-Dw1 G 14 09 13.0 +51 13 28           ~ 5 0
20 SDSS J150520.28+014846.6 LSB 15 05 20.28768 +01 48 46.6111       17.81   ~ 46 0
21 NAME NGC 5846 Group GrG 15 05 47.0 +01 34 25           ~ 165 0

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