2004AJ....128.2170H

Query : 2004AJ....128.2170H

2004AJ....128.2170H - Astron. J., 128, 2170-2205 (2004/November-0)

Star formation properties of a large sample of irregular galaxies.

HUNTER D.A. and ELMEGREEN B.G.

Abstract (from CDS):

We present the results of Hα imaging of a large sample of irregular galaxies. Our sample includes 94 galaxies with morphological classifications of Im, 26 blue compact dwarfs (BCDs), and 20 Sm systems. The sample spans a large range in galactic parameters, including integrated absolute magnitude (MV of -9 to -19), average surface brightness (20-27 mag/arcsec2), current star formation activity (0-1.3 M☉/yr/kpc2), and relative gas content (0.02-5M☉/LB). The Hα images were used to measure the integrated star formation rates, determine the extents of star formation in the disks, and compare azimuthally averaged radial profiles of current star formation to older starlight. The integrated star formation rates of Im galaxies normalized to the physical size of the galaxy span a range of a factor of 104 with 10% Im galaxies and one Sm system having no measurable star formation at the present time. The BCDs fall, on average, at the high star formation rate end of the range. We find no correlation between star formation activity and proximity to other cataloged galaxies. Two galaxies located in voids are similar in properties to the Sm group in our sample. The H II regions in these galaxies are most often found within the Holmberg radius RH, although in a few systems H II regions are traced as far as 1.7RH. Similarly, most of the star formation is found within three disk scale lengths RD, but in some galaxies H II regions are traced as far as 6RD. A comparison of Hα surface photometry with V-band surface photometry shows that the two approximately follow each other with radius in Sm galaxies, but in most BCDs there is an excess of Hα emission in the centers that drops with radius. In approximately half of the Im galaxies Hα and V correspond well, and in the rest there are small to large differences in the relative rate of falloff with radius. The cases with strong gradients in the LHα/LVratios and with high central star formation rate densities, which include most of the BCDs, require a significant fraction of their gas to migrate to the center in the last gigayear. We discuss possible torques that could have caused this without leaving an obvious signature, including dark matter bars and past interactions or mergers with small galaxies or H I clouds. There is now a substantial amount of evidence for these processes among many surveys of BCDs. We note that such gas migration will also increase the local pressure and possibly enhance the formation of massive dense clusters but conclude that the star formation process itself does not appear to differ much among BCD, Im, and Sm types. In particular, there is evidence in the distribution function for Hα surface brightness that the turbulent Mach numbers are all about the same in these systems. This follows from the Hα distribution functions corrected for exponential disk gradients, which are log-normal with a nearly constant dispersion. Thus, the influence of shock-triggered star formation is apparently no greater in BCDs than in Im and Sm types.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Irregular - Stars: Formation

VizieR on-line data: <Available at CDS (J/AJ/128/2170): table3.dat table4.dat refs.dat>

CDS comments: Galaxies D are ESDO, F are LSB or VLSB

Simbad objects: 189

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Number of rows : 189
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 MCG-03-01-015 G 00 01 57.9 -15 27 50   11.50 11.10 10.93   ~ 782 2
2 MCG+02-01-017 AG? 00 03 43.118 +15 13 04.71 14.78 14.80 14.19     ~ 72 1
3 Z 456-29 GiG 00 04 52.2 +17 11 33   15.3       ~ 19 0
4 UGC 159 LSB 00 17 16.1 +17 31 22           ~ 23 0
5 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
6 UGC 199 AG? 00 20 51.82 +12 51 21.7   19       ~ 24 0
7 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
8 NGC 244 Sy2 00 45 46.4165696064 -15 35 48.392605716   14.1   13.04 13.4 ~ 96 0
9 NGC 278 H2G 00 52 04.3452013728 +47 33 01.675026036   10.5       ~ 244 1
10 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
11 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
12 UGC 731 AG? 01 10 43.98 +49 36 07.9   17       ~ 103 0
13 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
14 MCG+01-06-052 AG? 02 10 43.492 +06 45 29.60   16.0       ~ 45 0
15 NGC 959 GiG 02 32 23.9241457416 +35 29 40.455279636 12.87 12.95 12.38 11.79   ~ 123 1
16 MCG+06-06-054 AG? 02 32 54.00 +38 40 50.1   17   14.50   ~ 50 0
17 Z 505-6 GiG 02 33 18.20 +33 29 28.0   14.9   13.59   ~ 91 0
18 Z 539-46 GiG 02 33 42.96 +40 31 41.2   15.0   13.45   ~ 71 0
19 Z 505-16 AG? 02 34 29.31 +29 44 59.4   15.7       ~ 59 0
20 NGC 1012 AG? 02 39 14.963 +30 09 06.01   13.1       ~ 99 1
21 MCG+00-07-077 EmG 02 40 23.09 +01 13 45.3   16.1   15.6 16.0 ~ 67 0
22 MCG+03-07-043 G 02 41 01.2 +17 25 51   16.5       ~ 14 0
23 LEDA 2832054 G 02 43 25.6 +16 44 00           ~ 12 0
24 NGC 1073 EmG 02 43 40.598 +01 22 33.13   11.3   11.3 11.8 ~ 335 0
25 Z 415-15 AG? 02 51 04.57 +04 27 13.9 14.76 15.07 14.70 14.50 14.29 ~ 127 0
26 LEDA 169969 G 02 57 34.5 +23 47 17           ~ 7 0
27 NGC 1156 GiG 02 59 42.8528847264 +25 14 28.352017320 12.13 12.32 11.74     ~ 323 1
28 MCG-03-09-045 EmG 03 28 14.510 -17 25 11.24   14.38   13.82   ~ 61 0
29 Z 327-16 AG? 04 13 02.949 +75 00 21.59   15.00       ~ 31 0
30 NAME Camel Galaxy LSB 04 25 16.6 +72 48 24   14.85       ~ 59 0
31 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
32 NGC 1637 Sy2 04 41 28.1926876152 -02 51 28.667815488   11.4   11.0 11.3 ~ 444 0
33 Z 328-19 AG? 04 47 55.20 +74 55 44.0   15.7       ~ 28 0
34 MCG+00-13-014 GiC 04 48 34.50 +00 14 30.0   14.7   13.9 14.4 ~ 68 0
35 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 692 1
36 UGC 3234 AG? 05 03 24.58 +16 24 15.6   16.5       ~ 33 0
37 MCG+12-06-006 AG? 05 33 37.54 +73 43 26.3   17       ~ 32 0
38 Z 329-14 AG? 05 45 34.924 +73 36 32.52   15.40       ~ 25 0
39 NGC 2101 AG? 05 46 24.17 -52 05 18.7   13.68   12.70 14.0 ~ 67 0
40 MCG+13-05-007a AG? 05 56 35.98 +75 19 01.9   17       ~ 89 0
41 Mrk 5 H2G 06 42 15.53 +75 37 32.6   17.0       ~ 114 0
42 Z 285-10 GiP 06 53 10.3954201680 +57 10 40.154257452   13.9       ~ 68 0
43 MCG+09-12-027 AG? 07 04 50.94 +56 31 13.8   16.0       ~ 39 0
44 Z 57-6 AG? 07 13 51.60 +10 31 19.0   14.9       ~ 105 0
45 Z 206-10 AG? 07 28 17.724 +40 46 11.36   15.50       ~ 155 0
46 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 588 3
47 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
48 MCG+07-16-011 AG? 07 41 25.777 +40 06 46.05   16.0       ~ 125 0
49 Z 87-30 G 07 41 56.3059298112 +16 48 07.451632188   15.4       ~ 233 0
50 MCG+10-12-046 AG? 07 58 54.20 +58 02 33.0   16.0       ~ 52 0
51 AGC 180072 LSB 08 09 32.6 +22 33 34           ~ 49 0
52 NGC 2537A G 08 13 41.023 +45 59 37.47   16       ~ 27 1
53 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
54 NGC 2552 EmG 08 19 20.5355420472 +50 00 34.590204468 13.44 13.00 12.56     ~ 284 1
55 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 209 1
56 LEDA 2790884 QSO 08 25 55.5166210656 +35 32 31.833368556   18.2       ~ 128 1
57 MCG+07-18-004 LSB 08 28 28.560 +41 51 27.13   18       ~ 175 0
58 Z 311-8 GiG 08 34 07.20 +66 10 54.0 15.39 15.03 14.70 14.49   ~ 357 2
59 Z 331-51 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 316 0
60 LEDA 86665 LSB 08 46 37.90 +18 53 23.7   17.21       ~ 51 0
61 NGC 2667 GiG 08 48 27.2534368152 +19 01 10.156738368   14.8       ~ 21 0
62 LEDA 86666 LSB 08 53 03.83 +18 26 09.4           ~ 81 0
63 Z 331-71 AG? 08 53 15.549 +73 11 19.81   15.0       ~ 26 0
64 Z 90-32 AG? 08 54 00.516 +18 40 56.11   15.6       ~ 31 0
65 LEDA 86668 LSB 09 02 53.357 +20 04 32.21   16.9       ~ 108 0
66 Z 34-2 AG? 09 08 10.1916625656 +05 55 41.538664560   15.7       ~ 53 0
67 LEDA 2806961 AG? 09 08 53.700 +14 35 02.05           ~ 45 0
68 VLSB F565-V01 LSB 09 19 28.2 +21 33 57   16.95       ~ 9 0
69 NGC 2916 Sy2 09 34 57.5933209584 +21 42 18.960584796 12.81 12.74 12.05     ~ 162 1
70 LEDA 86670 LSB 09 37 36.6 +21 46 15           ~ 53 0
71 Z 332-57 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 372 1
72 UGC 5209 LSB 09 45 04.196 +32 14 16.03   19       ~ 66 0
73 NGC 2976 GiG 09 47 15.458 +67 54 58.97 11.77 11.03 10.16 9.51   ~ 712 1
74 Z 182-20 H2G 09 48 04.6866187992 +32 52 56.953451244   14.8       ~ 43 0
75 Z 152-72 EmG 09 50 22.769 +31 29 17.80   14.48   14.10   ~ 207 0
76 UGC 5288 PaG 09 51 17.241 +07 49 32.05 15.07 14.65 14.18 13.99   ~ 95 0
77 Z 153-5 AG? 09 56 46.047 +28 49 43.77 14.82 14.74 14.59 14.55 26.509 ~ 252 1
78 Z 153-10 G 09 59 26.46 +30 44 47.0 14.08 13.54 13.26 13.33   ~ 652 0
79 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
80 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
81 Z 153-14 AG? 10 04 40.949 +29 21 51.54   15.2       ~ 75 0
82 Z 333-17 LSB 10 05 30.45024 +70 21 51.4253 15.95 15.56 15.09 14.87   ~ 214 1
83 Z 153-15 SBG 10 06 18.175 +28 56 41.49   14.64 14.12     ~ 55 0
84 Z 64-68 AG? 10 07 20.182 +10 21 40.16   13.78   13.24   ~ 125 0
85 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
86 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
87 LEDA 86618 LSB 10 17 56.3 +21 03 41           ~ 26 0
88 Mrk 32 AG? 10 27 01.7018076288 +56 16 14.337853680   16.5       ~ 38 0
89 UGC 5716 AG? 10 31 43.26364 +25 18 27.3731   17       ~ 82 0
90 2dFGRS TGN293Z129 LSB 10 35 23.11 -01 37 08.7   17.0       ~ 9 0
91 Z 290-65 AG? 10 44 28.536 +60 22 01.39   15.4       ~ 58 0
92 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 378 1
93 NGC 3359 EmG 10 46 36.845 +63 13 25.10 10.83 11.03 10.57     ~ 380 1
94 NGC 3377A GiP 10 47 22.4012897592 +14 04 16.697296020 14.17 14.31 13.61 13.51   ~ 150 1
95 NGC 3390 LIN 10 48 04.343 -31 32 00.04   13.24 13.41 11.43   ~ 90 1
96 MCG+11-13-039 GiG 10 49 36.412 +65 32 01.07 15.55 15.27 14.79 14.55   ~ 170 0
97 NGC 3413 EmG 10 51 20.709 +32 45 58.94   13.1       ~ 130 0
98 2dFGRS TGN433Z189 LSB 10 54 21.650 +02 11 36.50   17.9   17.414   ~ 10 0
99 NGC 3510 LSB 11 03 43.356 +28 53 13.58   13.6       ~ 199 0
100 MCG+05-26-046 SBG 11 04 58.298 +29 08 16.54   15.5 15.29     ~ 228 0
101 Z 351-62 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 346 1
102 Z 242-46 bCG 11 33 29.12 +49 14 17.4 14.69 14.61 14.25 14.17   ~ 242 1
103 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 303 0
104 Z 214-32 AG? 11 50 52.98254 +38 52 50.6594   13.72 13.9 13.39   ~ 175 0
105 NGC 3952 EmG 11 53 40.642 -03 59 47.46   13.84   13.7 13.3 ~ 95 0
106 Z 157-55 AG? 11 55 39.7060218792 +31 31 06.535928784   15.7       ~ 138 0
107 Z 186-78 GiG 11 58 29.804 +38 04 34.80   15.2       ~ 83 0
108 IC 2992 bCG 12 05 15.842 +30 51 19.49   14.8       ~ 43 0
109 NGC 4163 LSB 12 12 09.34 +36 10 08.1 14.33 13.70 13.2 12.98   ~ 238 0
110 IC 3059 GiP 12 14 55.197 +13 27 41.01 14.78 14.70 14.19     ~ 100 1
111 HS 1213+3636B EmG 12 15 34.8 +36 19 51   17.3       ~ 3 0
112 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1
113 NGC 4222 GiC 12 16 22.522 +13 18 25.46   13.86       ~ 208 1
114 NGC 4236 GiG 12 16 42.118 +69 27 45.25 10.97 10.58 10.08 9.90   ~ 415 1
115 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 582 1
116 Z 42-8 H2G 12 19 09.840 +03 51 23.34   14.5       ~ 168 0
117 Z 244-7 GiG 12 21 15.01 +45 48 40.8   14.8       ~ 123 2
118 Z 335-12 AG? 12 24 25.30 +70 20 01.0 13.93 13.38 12.86 12.60   ~ 74 0
119 Z 244-18 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 364 0
120 Z 187-44 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 217 0
121 Z 216-4 GiG 12 27 40.90 +43 29 44.0 13.75 13.10 12.7 12.33   ~ 270 0
122 Z 187-47 GiG 12 28 38.743 +35 43 02.91 15.50 15.12 14.86 14.78   ~ 130 1
123 NGC 4460 H2G 12 28 45.557 +44 51 51.25   12.5       ~ 147 0
124 IC 798 GiG 12 32 33.4026417888 +15 24 55.432700280   15.3       ~ 108 0
125 Z 159-13 GiC 12 32 54.5 +31 32 30   13.50   13.03   ~ 180 0
126 NGC 4523 GiC 12 33 47.9911135872 +15 10 06.049286292   15.1       ~ 178 0
127 UGCA 290 IG 12 37 21.7 +38 44 28   17       ~ 75 1
128 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 242 0
129 IC 809 GiG 12 42 08.6673855720 +11 45 15.438923748   15.1       ~ 118 0
130 NGC 4656 GiP 12 43 57.6889089768 +32 10 13.345914504   10.96 10.52     ~ 385 3
131 MCG+06-28-024 GiC 12 44 24.881 +34 23 03.33   15.0       ~ 72 0
132 Z 270-22 bCG 12 46 56.426 +51 36 46.80   14.1       ~ 119 0
133 NGC 4707 AG? 12 48 21.666 +51 09 53.81   15.2       ~ 113 0
134 LEDA 2806992 LSB 12 52 04.00 +12 54 26.3           ~ 13 0
135 UGC 8011 GiC 12 52 21.026 +21 37 46.00   18       ~ 41 0
136 NGC 4789A GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 614 1
137 CAIRNS J125436.80+285548.6 SBG 12 54 36.80 +28 55 48.6   16.7 16.61     ~ 8 0
138 LEDA 44055 LSB 12 55 41.0 +19 12 34           ~ 44 0
139 UGC 8055 LSB 12 56 04.6621560288 +03 48 46.548862992   17       ~ 51 0
140 Z 71-87 H2G 12 58 40.1930636208 +14 13 00.739589628 15.24 15.16 14.98 14.81   ~ 475 0
141 Z 71-95 LSB 13 00 24.968 +13 40 13.16   15.4       ~ 38 0
142 LEDA 87220 LSB 13 04 34.7355 +26 46 21.608   17.54       ~ 25 0
143 NGC 4948 EmG 13 04 55.953 -07 56 51.76   13.62   16.25 13.0 ~ 66 0
144 Z 316-9 AG? 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 268 1
145 MCG+08-24-048 AG? 13 08 03.552 +46 49 40.02   17       ~ 79 0
146 UGC 8276 AG? 13 12 06.554 +05 28 32.53   18       ~ 35 0
147 MCG+08-24-090 AG? 13 13 22.839 +46 19 21.71   17       ~ 135 1
148 Z 245-36 AG? 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 297 0
149 Z 245-38 AG? 13 15 29.753 +47 29 58.69   15.6       ~ 114 1
150 MCG-01-34-014 EmG 13 18 41.1 -08 26 47   13.6   13.8 14.3 ~ 41 0
151 Z 72-49 AG? 13 20 38.718 +09 47 10.11   14.6       ~ 62 0
152 Z 271-48 EmG 13 30 44.8682655624 +54 54 38.522749824 14.72 14.25 13.90 13.75   ~ 218 0
153 Z 161-84 SBG 13 35 35.658 +29 13 01.55   15.25 14.91     ~ 47 0
154 MCG-02-35-010 AG? 13 38 10.32 -09 48 06.6   12.5   12.05 12.6 ~ 65 0
155 Z 218-34 AG? 13 39 53.75 +40 44 25.3 15.37 14.56 14.20 14.10   ~ 165 0
156 Mrk 67 EmG 13 41 56.4808997304 +30 31 09.652262088   16.5       ~ 96 0
157 Z 190-66 AG? 13 50 51.3127548768 +38 01 14.958828876 15.56 14.78   14.33   ~ 161 0
158 Z 272-13 AG? 13 54 45.602 +53 54 20.06   14.2       ~ 219 0
159 LEDA 87294 LSB 13 55 56.7 +09 00 51           ~ 12 0
160 Z 74-83 GiC 14 04 47.380 +08 48 03.89   14.9       ~ 63 0
161 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
162 Z 219-66 QSO 14 17 01.716 +43 30 13.52   15.6       ~ 181 0
163 Z 247-26 AG? 14 24 43.21 +44 31 41.8 14.24 13.54 13.17 13.07   ~ 217 0
164 Z 163-86 bCG 14 36 08.833 +28 26 58.98   15.4       ~ 53 0
165 LEDA 87175 LSB 14 46 24.787 +14 12 38.59   16.42       ~ 26 0
166 Z 76-47 AG? 14 47 28.4392330584 +12 45 54.028462644   15.5       ~ 27 0
167 Z 249-29 AG? 15 32 56.177 +46 27 05.19   15.20       ~ 48 0
168 LEDA 86657 LSB 15 57 27.483 +20 39 59.12           ~ 104 0
169 UGC 10140 LSB 16 01 49.52202 +18 43 15.0282   18       ~ 24 0
170 UGC 10281 LSB 16 13 20.346 +17 11 35.88   18       ~ 43 0
171 Z 251-4 AG? 16 16 17.9000468088 +47 02 43.128874644   14.9       ~ 151 0
172 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 253 4
173 NGC 6789 AG? 19 16 41.169 +63 58 23.90   13.76       ~ 122 1
174 NAME Sgr dIG G 19 29 59.0 -17 40 41   15.5 13.6     ~ 323 1
175 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
176 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
177 MCG+02-55-015 LSB 21 49 28.40 +14 13 52.0   17       ~ 73 0
178 UGC 12029 AG? 22 24 47.807 +22 58 20.88   17       ~ 15 0
179 Z 514-45 GiG 22 30 33.98 +33 49 10.8   15.5       ~ 73 0
180 NGC 7320 GiG 22 36 03.4059680280 +33 56 53.623460220 13.12 13.23 12.63 12.38   ~ 204 3
181 MCG-01-57-016 AG? 22 36 35.05 -02 54 24.4   13.1   13.2 13.2 ~ 59 0
182 MCG-01-57-019 AG? 22 39 08.5247 -04 45 37.429   15.0   15.1 14.8 ~ 49 0
183 NGC 7351 EmG 22 41 26.9419391280 -04 26 40.581976092   13   12.50   ~ 34 0
184 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1
185 Z 533-8 GiG 23 29 58.540 +40 59 31.98   15.7       ~ 110 0
186 Z 497-42 bCG 23 37 39.543 +30 07 45.93   15.50       ~ 64 0
187 NGC 7741 GiP 23 43 54.375 +26 04 32.07 11.70 11.84 11.31     ~ 303 1
188 Z 477-12 GiG 23 48 49.40 +26 13 14.0   15.2       ~ 52 0
189 AGC 332123 LSB 23 54 19.392 +10 56 48.01           ~ 10 0

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