2025A&A...704A.113P

Query : 2025A&A...704A.113P

2025A&A...704A.113P - Astronomy and Astrophysics, volume 704A113 (2025/12-1)

Dwarf galaxies in the MATLAS survey: Hubble Space Telescope observations of nuclear star clusters.

POULAIN M., MARLEAU F.R., DUC P.-A., SANCHEZ-JANSSEN R., DURRELL P.R., PAUDEL S., HABAS R., MULLER O., LIM S., HEESTERS N. and FENSCH J.

Abstract (from CDS):

In dwarf galaxies, nuclear star clusters (NSCs) are believed to primarily form from the migration and merger of globular clusters (GCs), with a possible contribution from in situ star-forming activity triggered by gas infall. We present the study of NSCs in 41 MATLAS survey dwarf galaxies including ultra-diffuse galaxies (UDGs), as part of a large follow-up imaging program with the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) using the F606W and F814W filters. The sample is biased toward low surface brightness and large dwarfs, i.e., UDG-like galaxies, and includes two galaxies with a double nucleus; 13 newly identified nucleated dwarfs, thanks to HST's high spatial resolution; and five candidate ultra-compact dwarf progenitors. We modeled the NSCs with a Sérsic profile and derived their structural properties and photometry. We find the NSC Sérsic index to increase with the luminosity and stellar mass, while no obvious trend is seen for the effective radius and ellipticity. The faint NSCs tend to have a constant color profile, whereas the bright ones have a bluer center, suggesting that the most massive NSCs in our sample might have experienced a mixed formation scenario, including in situ star formation. A significant portion of our NSCs tend to be more massive than for other galaxy samples of similar stellar mass, which could be due to some dwarfs undergoing tidal disruption or an initial formation of massive NSCs from multiple GC mergers and in situ star-forming activity. More observations of resolved NSCs are needed to be able to infer their formation scenario from the structural properties and photometry in dwarfs.

Abstract Copyright: © The Authors 2025

Journal keyword(s): galaxies: dwarf - galaxies: nuclei - galaxies: star clusters: general - galaxies: structure

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

Simbad objects: 61

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Number of rows : 61
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 MATLAS-49 LSB 01 23 03.5 +09 06 07           ~ 6 0
3 MATLAS-138 G 01 51 35.7 +22 17 38           ~ 5 0
4 NAME NGC 936 UCD G 02 27 32.9 -01 13 49           ~ 4 0
5 NGC 936 EmG 02 27 37.462 -01 09 22.61   11.1   9.98 10.7 ~ 374 0
6 MATLAS-177 LSB 02 28 49.4 -01 18 15           ~ 7 0
7 MATLAS-207 G 02 49 47.0 -01 10 39           ~ 5 0
8 MATLAS-262 LSB 03 11 54.5 -04 53 35           ~ 5 0
9 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
10 MATLAS-347 G 08 16 32.6 +58 11 24           ~ 4 0
11 MATLAS-365 LSB 08 21 33.6 +22 28 06           ~ 7 0
12 MATLAS-368 LSB 08 22 17.5 +22 54 31           ~ 6 0
13 MATLAS-405 LSB 08 43 06.5 +50 04 42           ~ 7 0
14 MATLAS-478 LSB 09 12 52.0 +59 59 13           ~ 7 0
15 MATLAS-524 LSB 09 25 25.0 +34 23 57           ~ 6 0
16 MATLAS-627 LSB 10 04 15.5 +59 02 29           ~ 6 0
17 MATLAS-658 LSB 10 17 52.1 +22 20 01           ~ 8 0
18 MATLAS-682 G 10 22 21.0 +12 59 51           ~ 4 0
19 MATLAS-791 LSB 10 51 35.5 +28 15 15           ~ 6 0
20 LEDA 2807139 LSB 10 51 59.5 +28 21 36   17.0       ~ 21 0
21 MATLAS-898 LSB 11 17 01.7 +18 18 10           ~ 7 0
22 MATLAS-976 G 11 21 52.2 +03 14 27           ~ 5 0
23 MATLAS-984 LSB 11 22 17.8 +39 02 24           ~ 7 0
24 MATLAS-987 LSB 11 22 46.7 +38 27 35           ~ 7 0
25 MATLAS-991 G 11 22 51.3 +56 54 54           ~ 2 0
26 MATLAS-1059 LSB 11 27 51.6 +56 51 18           ~ 7 0
27 MATLAS-1154 LSB 12 01 36.0 +61 50 10           ~ 6 0
28 MATLAS-1216 LSB 12 15 10.2 +07 18 40           ~ 8 0
29 MATLAS-1225 LSB 12 16 25.1 +27 44 37           ~ 5 0
30 MATLAS-1262 LSB 12 17 51.9 +05 59 21           ~ 7 0
31 LEDA 39758 LSB 12 20 03.557 +05 43 14.22   21       ~ 12 0
32 LEDA 39788 AG? 12 20 16.1696620200 +05 02 21.101346456           ~ 16 0
33 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
34 LEDA 42498 G 12 40 50.986 +07 55 50.95   19       ~ 15 0
35 MATLAS-1408 LSB 12 41 11.2 -05 05 52           ~ 7 0
36 LEDA 42555 LSB 12 41 19.063 +02 06 00.41           ~ 10 0
37 MATLAS-1437 LSB 12 42 54.9 +02 15 09           ~ 6 0
38 MATLAS-1470 G 12 44 55.6 +02 17 46           ~ 4 0
39 LEDA 3348944 G 12 46 49.4526715128 +02 42 48.261583836           ~ 10 0
40 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
41 MATLAS-1539 G 13 29 41.3 +46 38 38           ~ 4 0
42 NGC 5198 GiP 13 30 11.3858465016 +46 40 14.667297420   13.2       ~ 189 0
43 MATLAS-1545 LSB 13 31 11.5 +46 48 58           ~ 8 0
44 MATLAS-1558 LSB 13 45 54.4 +61 05 51           ~ 5 0
45 NGC 5308 GiP 13 47 00.4361008824 +60 58 23.334066588   12.5       ~ 217 0
46 MATLAS-1577 G 13 48 13.4 +60 53 09           ~ 4 0
47 MATLAS-1616 LSB 13 52 29.3 +59 52 34           ~ 7 0
48 MATLAS-1630 LSB 13 53 02.5 +60 10 23           ~ 5 0
49 MATLAS-1662 GiG 13 55 00.6 +40 03 18       19.61   ~ 5 0
50 MATLAS-1667 LSB 13 55 16.6 +59 44 49           ~ 6 0
51 MATLAS-1740 G 14 07 38.2 +50 30 18           ~ 5 0
52 MATLAS-1779 LSB 14 11 05.3 -05 13 20           ~ 7 0
53 MATLAS-1907 LSB 14 30 50.9 +03 12 24           ~ 7 0
54 LEDA 3350778 AG? 15 00 33.024 +02 13 49.18       16.22   ~ 18 0
55 MATLAS-1975 LSB 15 03 21.3 +01 25 51       19.06   ~ 8 0
56 MATLAS-1985 LSB 15 04 02.5 +01 22 02       18.30   ~ 8 0
57 SDSS J150520.28+014846.6 LSB 15 05 20.28768 +01 48 46.6111       17.81   ~ 46 0
58 MATLAS-2021 LSB 15 05 21.6 +02 10 20           ~ 7 0
59 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
60 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
61 MATLAS-2176 G 23 01 45.0 +16 27 22           ~ 4 0

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