1998AJ....116..131T

Query : 1998AJ....116..131T

1998AJ....116..131T - Astron. J., 116, 131-145 (1998/July-0)

Hα velocity fields of H II regions in nearby dwarf irregular galaxies.

TOMITA A., OHTA K., NAKANISHI K., TAKEUCHI T.T. and SAITO M.

Abstract (from CDS):

We present Hα velocity fields of 13 giant H II regions in four nearby dwarf irregular galaxies: NGC 2366, Holmberg II, IC 2574, and WLM (the Wolf-Lundmark-Melotte system). We classify the velocity features, as well as the morphologies, of the H II regions. The Hα velocity features are divided into three categories; three H II regions show chaotic features with a typical scale of variation of a few hundred parsecs in size and a few times 10 km.s–1 in velocity, one region exhibits an expanding-bubble feature, and the remaining nine have calm velocity fields. There is a correlation between the Hα velocity features and the morphology of the H II regions. We measured the bulk motion of the H II regions relative to the ambient H I velocity for the H II regions with calm velocity fields and found a typical velocity difference of about 5 km.s–1. We discuss a model for the origin of star-forming regions based on the presence of the velocity difference between Hα and H I gas, as well as the H I characteristics.

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Journal keyword(s): Galaxies: Dwarf - Galaxies: Individual: NGC Number: NGC 2366 - galaxies: individual (Holmberg II, IC 2574) - Galaxies: Individual: Alphanumeric: WLM - Galaxies: Irregular - Galaxies: ISM

Simbad objects: 43

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Number of rows : 43
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 [HM95] WLM 2 HII 00 01 54.2 -15 26 51           ~ 4 0
2 [HM95] WLM 3 HII 00 01 54.7 -15 26 52           ~ 2 0
3 [HM95] WLM 4 HII 00 01 55.1 -15 26 55           ~ 2 0
4 [HM95] WLM 5 HII 00 01 55.2 -15 27 10           ~ 2 0
5 [HM95] WLM 6 HII 00 01 56.1 -15 28 38           ~ 2 0
6 [HM95] WLM 7 HII 00 01 56.3 -15 29 21           ~ 11 0
7 [HM95] WLM 8 HII 00 01 56.3 -15 27 00           ~ 3 0
8 [HM95] WLM 9 HII 00 01 56.5 -15 26 52           ~ 11 0
9 [HM95] WLM 10 HII 00 01 56.6 -15 29 28           ~ 2 0
10 [HM95] WLM 11 HII 00 01 56.8 -15 28 40           ~ 2 0
11 [HM95] WLM 12 HII 00 01 57.0 -15 29 13           ~ 3 0
12 [HM95] WLM 13 HII 00 01 57.0 -15 26 43           ~ 2 0
13 [HM95] WLM 14 HII 00 01 57.3 -15 27 02           ~ 2 0
14 [HM95] WLM 15 HII 00 01 57.3 -15 26 48           ~ 4 0
15 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
16 NGC 2363 AG? 07 28 29.59 +69 11 34.3   15.5       ~ 262 1
17 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 588 3
18 IRAS X0723+693 IR 07 28 44.4 +69 12 10           ~ 1 0
19 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
20 HSK 8 HII 08 18 50.2 +70 42 58           ~ 2 0
21 HK Ho II 18 HII 08 18 55.0 +70 42 54           ~ 8 0
22 HK Ho II 17 HII 08 18 55.3 +70 42 59           ~ 6 0
23 HK Ho II 16 HII 08 18 56.4 +70 42 39           ~ 7 0
24 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
25 HK Ho II 11 HII 08 19 13.3 +70 43 08           ~ 11 0
26 TYC 4377-2371-1 * 08 19 16.1084518824 +70 42 59.027597208   12.31 11.86     ~ 3 0
27 [CVL2009] UGC 4305-3 HII 08 19 28.88 +70 42 19.5   13.4   12.9   ~ 16 0
28 [ZEH2003] RX J0819.4+7042 12 HII 08 19 29.0 +70 42 47   19.1       ~ 9 0
29 HK Ho II 2 HII 08 19 29.0 +70 43 01           ~ 9 0
30 [ZEH2003] RX J0819.4+7042 10 HII 08 19 30.20 +70 42 40.5   19.1       ~ 7 0
31 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
32 IC 2574 AG? 10 28 23.6148831408 +68 24 43.440012756 11.70 11.07 10.87 10.74   ~ 703 1
33 [MH94a] IC 2574 167 HII 10 28 43.6 +68 28 27           ~ 5 1
34 [CVL2009] UGC 5666-8 HII 10 28 44.14 +68 28 31.6           ~ 5 1
35 [MCR94] I HII 10 28 44.4 +68 28 26           ~ 3 0
36 [MH94a] IC 2574 179 HII 10 28 45.4 +68 28 34           ~ 3 1
37 [MH94a] IC 2574 180 HII 10 28 45.6 +68 28 25           ~ 3 1
38 [MH94a] IC 2574 185 HII 10 28 47.0 +68 28 25           ~ 2 0
39 [CVL2009] UGC 5666-3 HII 10 28 48.46 +68 28 02.9           ~ 9 0
40 HK IC 2574 34 HII 10 28 48.88 +68 28 34.4           ~ 5 0
41 [CVL2009] UGC 5666-5 HII 10 28 49.59 +68 28 27.9           ~ 6 1
42 [MH94a] IC 2574 202 HII 10 28 50.1 +68 28 23           ~ 3 1
43 NAME NGC 2366 III HII ~ ~   13.63 13.52     ~ 7 0

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