2002AJ....123.2449H

Query : 2002AJ....123.2449H

2002AJ....123.2449H - Astron. J., 123, 2449-2461 (2002/May-0)

The distribution of atomic hydrogen around two irregular galaxies.

HUNTER D.A. and WILCOTS E.M.

Abstract (from CDS):

We present radio interferometric observations of two irregular galaxies that were candidates for having unusually extended H I emission. The galaxies, UGC 199 and DDO 26, otherwise appeared to be normal, low-luminosity systems with modest star formation rates. To a detection limit of (2-3)x1019 cm–2 at a resolution of about 50", however, the H I around neither galaxy is unusually extended compared with other irregular galaxies. The H I around UGC 199 appears as a regular, symmetric distribution with regular rotation and a maximum rotation speed of about 80 km.s–1. By contrast, the H I around DDO 26 shows a concentration into two blobs with an arm in the outer parts to the northwest and some additional emission to the northwest of that. The kinematical major axis is approximately 75° from the H I and optical morphological axis, which is unusual for Im galaxies. In addition the velocity field in the outer parts of the galaxy is messy, and the velocity profiles at the two H I peaks are broad. We suggest that DDO 26 has been perturbed externally or may be two dwarfs in the process of merging.

Abstract Copyright: ∼

Journal keyword(s): galaxies: individual (UGC 199, DDO 26) - Galaxies: Irregular - Galaxies: ISM - Galaxies: Kinematics and Dynamics

Nomenclature: Table 3, Fig.1: [HW2002] UGC 199 NN (Nos 1-16). Table 4, Fig.7: [HW2002] DDO 26 NN (Nos 1-10).

Simbad objects: 37

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Number of rows : 37
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 [HW2002] UGC 199 6 Rad 00 19 37.6 +13 02 41           ~ 1 0
2 [HW2002] UGC 199 7 Rad 00 19 44.7 +12 58 21           ~ 1 0
3 [HW2002] UGC 199 8 Rad 00 19 46.5 +12 54 53           ~ 1 0
4 [HW2002] UGC 199 15 Rad 00 19 47.5 +12 28 15           ~ 1 0
5 [HW2002] UGC 199 5 Rad 00 19 51.8 +13 02 03           ~ 1 0
6 [HW2002] UGC 199 3 Rad 00 20 10.5 +13 10 43           ~ 1 0
7 [HW2002] UGC 199 14 Rad 00 20 16.8 +12 37 08           ~ 1 0
8 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
9 [HW2002] UGC 199 10 Rad 00 20 28.3 +12 52 57           ~ 1 0
10 [HW2002] UGC 199 13 Rad 00 20 33.6 +12 43 25           ~ 1 0
11 [HW2002] UGC 199 12 Rad 00 20 33.6 +12 46 40           ~ 1 0
12 [HW2002] UGC 199 11 Rad 00 20 36.3 +12 47 32           ~ 1 0
13 UGC 199 AG? 00 20 51.82 +12 51 21.7   19       ~ 24 0
14 [HW2002] UGC 199 1 Rad 00 20 55.8 +13 13 32           ~ 1 0
15 [HW2002] UGC 199 2 Rad 00 21 41.2 +13 10 30           ~ 1 0
16 [HW2002] UGC 199 16 Rad 00 21 44.7 +12 33 01           ~ 1 0
17 [HW2002] UGC 199 4 Rad 00 21 58.1 +13 03 07           ~ 1 0
18 [HW2002] UGC 199 9 Rad 00 22 31.0 +12 57 03           ~ 1 0
19 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
20 [HW2002] DDO 26 5 Rad 02 33 31.5 +29 47 27           ~ 1 0
21 [HW2002] DDO 26 9 Rad 02 33 37.6 +29 30 46           ~ 1 0
22 [HW2002] DDO 26 2 Rad 02 33 40.4 +29 56 33           ~ 1 0
23 [HW2002] DDO 26 6 Rad 02 33 44.5 +29 42 54           ~ 1 0
24 [HW2002] DDO 26 8 Rad 02 33 55.5 +29 32 44           ~ 1 0
25 [HW2002] DDO 26 7 Rad 02 34 19.4 +29 33 36           ~ 1 0
26 Z 505-16 AG? 02 34 29.31 +29 44 59.4   15.7       ~ 59 0
27 [HW2002] DDO 26 1 Rad 02 34 36.4 +29 57 52           ~ 1 0
28 [HW2002] DDO 26 10 Rad 02 34 58.3 +29 29 42           ~ 1 0
29 [HW2002] DDO 26 3 Rad 02 35 00.4 +29 50 17           ~ 1 0
30 [HW2002] DDO 26 4 Rad 02 35 03.3 +29 46 23           ~ 1 0
31 NGC 1012 AG? 02 39 14.963 +30 09 06.01   13.1       ~ 99 1
32 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
33 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
34 Z 268-36 GiC 11 26 40.4656762968 +53 44 48.012539280   14.5       ~ 164 0
35 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1192 1
36 Z 251-4 AG? 16 16 17.9000468088 +47 02 43.128874644   14.9       ~ 151 0
37 Z 343-3 AG? 21 56 24.148 +73 15 39.33   15.2       ~ 102 0

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