2000AJ....119.1145R


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST08:25:14

2000AJ....119.1145R - Astron. J., 119, 1145-1156 (2000/March-0)

The spatial distributions of H II regions in irregular galaxies.

ROYE E.W. and HUNTER D.A.

Abstract (from CDS):

CCD Hα and V-band images were used to examine the distributions of star-forming regions in 34 irregular galaxies, 28 of which are normal Im's and six of which are blue compact dwarf (BCD)/starburst irregulars. The V-band images were used to determine the center, position angle, and inclination of the galaxies. The Hα images were used to trace the star formation through H II regions. H II region distributions in the plane of the galaxies were compared to turnovers in the rotation curves, the sizes of the galaxies, and locations relative to stellar bars. The overall symmetry and concentration of the H II distributions were also determined. The H II regions are concentrated toward the inner halves of 88% of the galaxies. Furthermore, most of the H II regions and complexes are located within R25, the radius at a B surface brightness of 25 mag.arcsec–2, as well as within the part of the galaxy that is rotating as a solid body. Most giant H II regions and complexes are even more centrally concentrated than the bulk of the H II regions and there is otherwise no preferred location. There are no obvious differences in the distribution of H II regions in BCDs and starburst galaxies relative to that of typical irregulars. However, in one BCD/starburst galaxy there are H II complexes located well beyond the turnover in the rotation curve, indicating that not all galaxies with intense star formation are unusually centrally concentrated. Finally, the overall distribution of H II regions is symmetrical in most of the galaxies. Some of the irregular galaxies in our sample have normal rotation curves, while others show no measurable ordered rotation. Most of the galaxies that do not have measurable rotation have lower star formation rates, while those with measurable rotation velocities extend to higher star formation rates. In addition, the degree of central concentration of H II regions is low in the galaxies with no measurable ordered rotation, and the galaxies with the fastest Vrot,max have among the highest central concentrations of H II regions.

Abstract Copyright:

Journal keyword(s): Galaxies: Irregular - ISM: H II Regions - Stars: Formation

Status at CDS:  

Simbad objects: 39

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Number of rows : 39

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME WLM Galaxy G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 569 2
2 IC 10 G 00 20 23.16 +59 17 34.7   13.6 9.5     ~ 1005 0
3 NGC 604 HII 01 34 32.1 +30 47 01           ~ 542 0
4 NGC 1156 rG 02 59 42.8526900556 +25 14 28.350265697 12.13 12.32 11.74     ~ 275 1
5 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1145 3
6 UGC 3860 G 07 28 17.724 +40 46 11.36   15.50       ~ 131 0
7 NGC 2363 G 07 28 29.83 +69 11 32.8   15.5       ~ 250 1
8 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 540 3
9 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 698 0
10 UGC 3966 G 07 41 25.777 +40 06 46.05   16.0       ~ 99 0
11 UGC 3974 G 07 41 56.3061361330 +16 48 07.439323443   15.4       ~ 199 0
12 UGC 4305 IG 08 19 04.9878269182 +70 43 13.025604473 12.06 11.72 11.39 11.11   ~ 684 2
13 UGC 4459 GiG 08 34 07.29 +66 10 54.6 15.39 15.03 14.70 14.49   ~ 290 2
14 NAME Leo Dwarf Irregular Galaxy G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 546 0
15 NAME Sextans B H2G 10 00 00.8201300945 +05 20 09.572530884 12.77 12.25 11.89 11.71   ~ 466 0
16 NAME Sex A H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 651 2
17 UGC 5918 GiG 10 49 36.412 +65 32 01.07 15.55 15.27 14.79 14.55   ~ 122 0
18 UGC 6456 bCG 11 28 00.43 +78 59 38.4   14.50       ~ 305 1
19 Mrk 178 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 211 1
20 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 246 0
21 UGC 6900 G 11 55 39.7065939676 +31 31 06.530347793   15.7       ~ 94 0
22 IC 3059 GiP 12 14 55.197 +13 27 41.01 14.78 14.70 14.19     ~ 83 1
23 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 862 1
24 Mrk 209 bCG 12 26 16.02 +48 29 36.6   15.3       ~ 299 0
25 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5788 0
26 UGC 7559 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 165 0
27 UGC 7577 GiG 12 27 41.8803124881 +43 29 58.140216428 13.75 13.10 12.7 12.33   ~ 224 0
28 UGC 7698 GiC 12 32 53.771 +31 32 50.56   13.50   13.03   ~ 132 0
29 UGC 8024 GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 528 1
30 UGC 8091 H2G 12 58 40.1930291852 +14 13 00.737117016 15.24 15.16 14.98 14.81   ~ 437 0
31 UGC 8201 G 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 222 1
32 UGC 8308 G 13 13 22.839 +46 19 21.71   17       ~ 116 1
33 UGC 8320 G 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 232 0
34 UGC 8331 G 13 15 29.753 +47 29 58.69   15.6       ~ 91 1
35 UGC 8508 G 13 30 44.8713405615 +54 54 38.531712530 14.72 14.25 13.90 13.75   ~ 161 0
36 UGC 8760 G 13 50 51.3121098935 +38 01 14.956142286 15.56 14.78   14.33   ~ 129 0
37 UGC 8837 G 13 54 45.602 +53 54 20.06   14.2       ~ 178 0
38 UGC 9128 G 14 15 56.70 +23 03 16.2 15.40 14.77 14.41 14.32   ~ 254 0
39 NAME Peg Dwarf Irregular Galaxy G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 419 1

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2020.05.27-08:25:14

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