2025AJ....170...76H

Query : 2025AJ....170...76H

2025AJ....170...76H - Astron. J., 170, 76 (2025/August-0)

Ultradeep Imaging of Nearby Dwarf Irregular Galaxies: Young Objects in the Far Outer Disk.

HUNTER D.A., ZHANG H.-X., ELMEGREEN B.G., CASTELLOE E.R., LEDFORD H.M., NISLEY I. and HATANO R.

Abstract (from CDS):

Ultradeep UBVI imaging of 10 nearby (≤7.8 Mpc) noninteracting dwarf irregular galaxies are used to examine their far outer stellar disks. The annulus between 26 mag arcsec–2 and 29 mag arcsec–2 in the V band is what we define as the far outer disk and is our focus here. Photometry of distinct objects in the far outer disks, including far-UV images, is used to determine ages of the objects in order to look for those that are young. In three of the galaxies we find objects with high-confidence ages ≤30 Myr. These objects are too young to have scattered into the far outer disk from the central regions. Therefore, they likely formed in situ. How star-forming gas clouds formed in the extreme environment of the outer stellar disks of dwarfs is a primary unanswered question.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Dwarf irregular galaxies - Star formation - Galaxy evolution

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR. // All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 19

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Number of rows : 19
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 NGC 244 Sy2 00 45 46.4165696064 -15 35 48.392605716   14.1   13.04 13.4 ~ 96 0
2 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
3 NAME Magellanic Bridge HI 03 11 -77.5           ~ 522 1
4 Z 206-10 AG? 07 28 17.724 +40 46 11.36   15.50       ~ 155 0
5 MCG+07-16-011 AG? 07 41 25.777 +40 06 46.05   16.0       ~ 125 0
6 Z 87-30 G 07 41 56.3059298112 +16 48 07.451632188   15.4       ~ 233 0
7 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
8 LEDA 86668 LSB 09 02 53.357 +20 04 32.21   16.9       ~ 108 0
9 Z 332-57 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 372 1
10 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
11 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 703 1
12 Z 242-46 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 242 1
13 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 303 0
14 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1967 1
15 Z 271-48 EmG 13 30 44.8682655624 +54 54 38.522749824 14.72 14.25 13.90 13.75   ~ 218 0
16 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
17 LEDA 84914 EmG 19 40 58.6472202096 -42 15 44.885332440   15.78   14.86 14.9 ~ 27 0
18 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
19 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1

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