2019AJ....158..229M

Query : 2019AJ....158..229M

2019AJ....158..229M - Astron. J., 158, 229-229 (2019/December-0)

Ultraviolet Imaging Telescope view of dwarf irregular galaxy IC 2574: is the star formation triggered due to expanding H I shells?

MONDAL C., SUBRAMANIAM A. and GEORGE K.

Abstract (from CDS):

Star-forming dwarf galaxies in the local volume are diverse and ideal test beds to understand the details of star formation in a variety of environments. Here we present a deep far-UV (FUV) imaging study of the nearby dwarf irregular galaxy IC 2574 using the Ultraviolet Imaging Telescope. We identified 419 FUV-bright regions with radii between 15 and 285 pc in the galaxy and found that 28.6% of them are located in H I shells, 12.6% inside holes, and 60.1% away from the holes. The H I column density is found to be more than 1021 cm–2 for 82.3% of the identified regions. Thirty of the 48 H I holes show triggered star formation in their shells, while 16 holes do not show any related FUV emission. Cross-matching with Hα emission, we found that 23 holes have both FUV and Hα emission in their shells, signifying a very recent trigger. Therefore, star formation in the galaxy has been partly triggered due to the expanding H I holes, whereas in the majority of the sites, it is driven by other mechanisms. Irrespective of the location, larger star-forming complexes were found to have multiple substructures. We report two resolved components for the remnant cluster of the supergiant shell and estimate their masses. The star formation rate of IC 2574 is found to be 0.57 M☉ yr–1, which is slightly higher compared to the average value of other nearby dwarf irregular galaxies.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Dwarf galaxies - Star formation

VizieR on-line data: <Available at CDS (J/AJ/158/229): table5.dat>

Nomenclature: Table 5: [MSG2019] NNN (Nos 1-419). Fig. 8, Paragr. 4.5: [MSG2019] S-N (Nos S-1 to S-6). Fig. 9, Table 7: [MSG2019] Shell 35 RCN (Nos RC1-RC2).

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

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 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
4 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
5 Z 332-57 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 372 1
6 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
7 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
8 [WB99] Hole 1 HI 10 27 16.2 +68 21 08           ~ 2 0
9 [WB99] Hole 2 HI 10 27 19.7 +68 21 25           ~ 2 0
10 [WB99] Hole 3 HI 10 27 29.6 +68 21 39           ~ 2 0
11 [WB99] Hole 4 HI 10 27 34.2 +68 24 55           ~ 2 0
12 [WB99] Hole 5 HI 10 27 40.3 +68 18 48           ~ 2 0
13 [WB99] Hole 6 HI 10 27 42.2 +68 26 49           ~ 2 0
14 [WB99] Hole 7 HI 10 27 43.9 +68 21 31           ~ 2 0
15 [WB99] Hole 8 HI 10 27 46.1 +68 24 38           ~ 2 0
16 [WB99] Hole 9 HI 10 27 46.9 +68 22 40           ~ 2 0
17 [WB99] Hole 10 HI 10 27 47.8 +68 21 21           ~ 2 0
18 [WB99] Hole 11 HI 10 27 53.6 +68 27 14           ~ 2 0
19 [WB99] Hole 12 HI 10 27 56.3 +68 21 53           ~ 2 0
20 [WB99] Hole 13 HI 10 27 56.4 +68 23 54           ~ 2 0
21 [WB99] Hole 14 HI 10 27 58.3 +68 22 52           ~ 2 0
22 [WB99] Hole 15 HI 10 28 04.7 +68 22 00           ~ 2 0
23 [WB99] Hole 16 HI 10 28 07.7 +68 22 37           ~ 2 0
24 [WB99] Hole 17 HI 10 28 08.0 +68 28 13           ~ 2 0
25 [WB99] Hole 18 HI 10 28 09.2 +68 23 23           ~ 2 0
26 [WB99] Hole 19 HI 10 28 12.9 +68 27 38           ~ 2 0
27 [WB99] Hole 21 HI 10 28 16.2 +68 24 28           ~ 2 0
28 [WB99] Hole 22 HI 10 28 21.6 +68 24 15           ~ 2 0
29 [WB99] Hole 23 HI 10 28 22.3 +68 27 15           ~ 2 0
30 [WB99] Hole 20 HI 10 28 23.1 +68 24 58           ~ 2 0
31 [WB99] Hole 24 HI 10 28 23.1 +68 24 58           ~ 2 0
32 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 703 1
33 [WB99] Hole 25 HI 10 28 24.9 +68 20 37           ~ 2 0
34 [WB99] Hole 26 HI 10 28 29.4 +68 21 48           ~ 2 0
35 [WB99] Hole 27 HI 10 28 30.1 +68 25 49           ~ 2 0
36 [WB99] Hole 28 HI 10 28 30.5 +68 24 23           ~ 2 0
37 [WB99] Hole 29 HI 10 28 33.7 +68 28 02           ~ 2 0
38 [WB99] Hole 30 HI 10 28 37.0 +68 24 39           ~ 2 0
39 [WB99] Hole 31 HI 10 28 38.1 +68 27 58           ~ 2 0
40 [WB99] Hole 32 HI 10 28 41.5 +68 26 22           ~ 2 0
41 [WB99] Hole 33 HI 10 28 42.6 +68 27 28           ~ 2 0
42 [WB99] Hole 34 HI 10 28 43.5 +68 27 05           ~ 2 0
43 NAME IC 2574 SGS sh 10 28 44.1 +68 28 12           ~ 14 0
44 [MSG2019] Shell 35 RC2 UV 10 28 44.60 +68 28 06.5           ~ 1 0
45 [MSG2019] Shell 35 RC1 UV 10 28 44.70 +68 28 10.5           ~ 1 0
46 [WB99] Hole 36 HI 10 28 46.2 +68 29 34           ~ 2 0
47 [WB99] Hole 37 HI 10 28 46.6 +68 28 58           ~ 2 0
48 [WB99] Hole 38 HI 10 28 47.4 +68 25 07           ~ 2 0
49 [WB99] Hole 39 HI 10 28 48.9 +68 26 18           ~ 2 0
50 [WB99] Hole 40 HI 10 28 52.5 +68 28 40           ~ 2 0
51 [WB99] Hole 41 HI 10 28 53.7 +68 23 24           ~ 2 0
52 [WB99] Hole 42 HI 10 28 55.5 +68 28 36           ~ 2 0
53 [WB99] Hole 43 HI 10 28 55.6 +68 22 36           ~ 2 0
54 [WB99] Hole 44 HI 10 28 57.1 +68 22 32           ~ 2 0
55 [WB99] Hole 45 HI 10 28 59.3 +68 25 52           ~ 2 0
56 [WB99] Hole 46 HI 10 29 02.6 +68 26 36           ~ 2 0
57 [WB99] Hole 47 HI 10 29 09.2 +68 25 52           ~ 2 0
58 [WB99] Hole 48 HI 10 29 14.7 +68 27 32           ~ 2 0

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