2005ApJ...630..824H

Query : 2005ApJ...630..824H

2005ApJ...630..824H - Astrophys. J., 630, 824-836 (2005/September-2)

Star formation in H I-selected galaxies. II. H II region properties.

HELMBOLDT J.F., WALTERBOS R.A.M., BOTHUN G.D. and O'NEIL K.

Abstract (from CDS):

A sample of 69 galaxies with radial velocities less than 2500 km/s was selected from the H I Parkes All Sky Survey (HIPASS) to deduce details about star formation in nearby disk galaxies selected with no bias to optical surface brightness selection effects. Broadband (B and R) and narrowband (Hα) images were obtained for all of these objects. More than half of the sample galaxies are late-type, dwarf disks (mostly Sc and Sm galaxies). We have measured the properties of the H II regions on Hα continuum-subtracted images, using the HIIphot package developed by Thilker et al. All but one of the galaxies contained at least one detectable H II region. Examination of the properties of the H II regions in each galaxy revealed that the brightest regions in higher surface brightness galaxies tend to be more luminous than those in lower surface brightness galaxies. A higher fraction (referred to as the diffuse fraction) of the Hα emission from lower surface brightness galaxies comes from diffuse ionized gas. H II region luminosity functions (LFs) co-added according to surface brightness show that the shapes of the LFs for the lowest surface brightness galaxies are different from those for typical spiral galaxies. This discrepancy could be caused by the lowest surface brightness galaxies having somewhat episodic star formation or by them forming a relatively larger fraction of their stars outside of dense, massive molecular clouds. In general, the results imply that the conditions under which star formation occurs in lower surface brightness galaxies are different than in more typical, higher surface brightness spiral galaxies.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: ISM - Galaxies: Photometry - Galaxies: Stellar Content - ISM: H II Regions

Simbad objects: 73

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Number of rows : 73
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 ESO 79-5 AG? 00 40 44.4831496008 -63 26 25.213507728   13.74   12.76 13.2 ~ 58 0
2 ESO 79-7 EmG 00 50 04.120 -66 33 09.90   13.72   12.80 13.4 ~ 48 0
3 NGC 406 G 01 07 25.060 -69 52 45.27   13.02   12.14 12.0 ~ 91 0
4 ESO 13-16 AG? 01 32 48.12 -79 28 27.6   13.53   12.52 13.3 ~ 50 0
5 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1934 1
6 ESO 80-5 Sy2 01 47 39.2844124056 -66 09 47.480948676   16.05 16.0 14.57   ~ 19 0
7 NGC 802 AG? 01 59 05.9571021576 -67 52 12.129960216   14.17   13.32 13.6 ~ 38 0
8 NGC 1313 AG? 03 18 16.046 -66 29 53.74   10.06 10.0 9.40 10.4 ~ 723 2
9 ESO 54-21 AG? 03 49 49.445 -71 38 07.38   12.98   11.64 12.0 ~ 65 0
10 NGC 1511 G 03 59 36.98373 -67 38 03.3430   11.97   10.74 11.1 ~ 158 1
11 NGC 1559 GiG 04 17 35.7508602240 -62 47 01.251567384   11.19 10.45 10.11 10.4 ~ 325 1
12 ESO 84-40 AG? 04 44 59.53 -62 42 22.2   15.01   14.42 14.4 ~ 14 0
13 ESO 119-16 AG? 04 51 29.07 -61 38 59.8 15.28 14.98 14.58 14.38 14.0 ~ 52 0
14 ESO 85-14 AG? 04 54 43.164 -62 48 02.10   13.42   12.57   ~ 40 0
15 ESO 85-30 GiG 05 01 29.6998042104 -63 17 35.786160312   13.78   12.9 12.7 ~ 51 0
16 NGC 1809 GiG 05 02 05.008 -69 34 05.82   12.1   11.3 11.4 ~ 69 0
17 ESO 4-17 AG? 05 04 29.36 -87 01 45.0   15.97   15.55 16.9 ~ 17 0
18 ESO 85-47 AG? 05 07 42.9990 -62 59 29.906   14.57   13.56 14.2 ~ 42 0
19 NGC 1892 GiG 05 17 09.0127062984 -64 57 34.791231996   12.72   11.9 11.8 ~ 81 0
20 NGC 2082 GiG 05 41 51.0901098120 -64 18 03.828857148   12.79   11.45 11.6 ~ 101 0
21 IC 2150 AG? 05 51 18.558 -38 19 13.62   13.60   12.43 12.9 ~ 50 0
22 ESO 86-60 AG? 06 08 09.0488 -63 35 10.297   15.97   15.35 15.0 ~ 11 0
23 LEDA 271582 G 06 35 11.8 -70 51 52   16.0   16.1 15.9 ~ 7 0
24 HIPASS J0653-73 AG? 06 53 51.8264 -73 42 26.532           ~ 10 0
25 NGC 2397B AG? 07 21 55.57 -68 50 44.9   14.98   13.95   ~ 13 0
26 ESO 35-9 AG? 07 28 40.60 -75 03 20.0   16.03   15.03 15.0 ~ 15 0
27 ESO 59-1 AG? 07 31 18.20 -68 11 16.8   13.74   12.80 13.7 ~ 81 1
28 ESO 17-2 AG? 07 32 22.1076312696 -77 55 09.349761936   14.72   13.39 13.6 ~ 21 0
29 NGC 2442 LIN 07 36 23.7700545576 -69 31 50.997856332 11.47 11.15 10.42 9.71 10.4 ~ 243 1
30 ESO 35-18 Sy2 07 55 04.182 -76 24 45.19   14.08   12.45 13.1 ~ 56 0
31 ESO 35-20 AG? 08 03 17.1780 -77 04 23.043   15.81   14.59 14.7 ~ 16 0
32 ESO 35-21 AG? 08 09 55.49 -74 30 41.8   17.16   16.08 15.1 ~ 13 0
33 ESO 60-3 EmG 08 16 33.486 -71 51 31.88   15.25   14.36   ~ 13 0
34 ESO 60-7 AG? 08 27 26.50 -71 04 19.3   16.77   16.03   ~ 9 0
35 ESO 90-4 AG? 08 38 37.10 -64 20 32.0   14.2   14.3 14.4 ~ 12 0
36 ESO 36-6 AG? 08 38 47.2461 -75 09 17.339   14.19   13.71 13.6 ~ 21 0
37 ESO 60-19 AG? 08 57 26.741 -69 03 36.13   12.79   11.92 12.0 ~ 54 0
38 NGC 2788B G 09 03 37.2 -67 57 59   14.51   13.64   ~ 21 0
39 NGC 2836 AG? 09 13 44.9698 -69 19 59.039   12.64   12.01 12.5 ~ 17 0
40 ESO 91-7 GiG 09 17 31.099 -62 53 04.13   13.85   12.94 13.1 ~ 27 0
41 NGC 2915 AG? 09 26 11.532 -76 37 34.75 13.13 12.93 12.68 11.90 12.8 ~ 371 2
42 ESO 37-4 AG? 09 32 37.51 -74 15 16.1   16.69       ~ 9 0
43 NGC 3059 EmG 09 50 08.181 -73 55 19.96   11.56 11.24 10.66 11.5 ~ 113 1
44 ESO 61-17 AG? 09 52 33.37 -69 03 54.4   14.81   14.01 14.8 ~ 10 0
45 ESO 92-6 GiG 10 03 18.6226083504 -64 58 02.790826068   13.45   12.47 13.1 ~ 33 0
46 NGC 3136A AG? 10 03 32.58 -67 26 54.5   15.60   14.79 14.3 ~ 16 0
47 ESO 37-10 EmG 10 04 17.1946355280 -75 28 44.036845176   13.15   12.14 12.6 ~ 29 0
48 IC 2554 AG? 10 08 50.563 -67 01 51.07   12.43 13.20 11.24 11.9 ~ 66 0
49 ESO 92-21 GiG 10 21 05.5193421384 -66 29 31.097169744   13.89   13.5 13.3 ~ 32 0
50 ESO 37-15 AG? 10 25 43.1233 -76 30 13.124   16.41   14.5 14.8 ~ 12 0
51 HIPASS J1039-71 G 10 39 40.00 -71 55 23.0           ~ 2 0
52 ESO 19-4 AG? 10 48 49.25 -80 14 12.8   15.4   15.3 15.2 ~ 10 0
53 ESO 38-11 AG? 11 20 58.10 -75 52 45.4           ~ 5 0
54 IC 3104 AG? 12 18 46.06 -79 43 33.9   13.65 12.8 12.04   ~ 93 1
55 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
56 NGC 5068 AG? 13 18 54.807 -21 02 20.76 11.24 10.53 10.01 9.78 10.1 ~ 354 0
57 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
58 ESO 21-3 AG? 13 32 27.29 -80 25 56.5   13.6   13.2 13.2 ~ 22 0
59 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2778 2
60 NGC 6300 Sy2 17 16 59.5418094960 -62 49 13.946588832   10.88 13.08 9.44 10.2 ~ 478 1
61 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 253 4
62 NGC 6438A AG? 18 22 35.49 -85 24 22.8   12.57   11.40   ~ 26 0
63 ESO 140-19 AG? 18 22 46.3462 -62 16 22.777   16.59   15.0 15.7 ~ 21 0
64 IC 4710 AG? 18 28 37.969 -66 58 56.20   12.53   11.33 12.4 ~ 112 1
65 ESO 104-22 LSB 18 55 41.2 -64 48 39   15.62   14.67 13.1 ~ 35 0
66 IC 4870 AGN 19 37 37.5995314008 -65 48 42.669480564   13.92 14.63 12.77 13.1 ~ 73 0
67 IC 5028 AG? 20 43 22.03 -65 38 52.1   15.24   14.83 15.1 ~ 17 0
68 NGC 7098 AG? 21 44 16.1497974000 -75 06 40.864242528   12.33 11.37 10.84 11.5 ~ 88 0
69 NGC 7095 GiP 21 52 26.5174422024 -81 31 51.109094280   12.22   11.08 12.4 ~ 70 1
70 IC 5176 Sy2 22 14 55.928 -66 50 57.88   13.54   11.97 12.4 ~ 109 0
71 ESO 27-21 Sy1 23 04 18.9937979760 -79 27 57.322508292   13.95   12.81 13.8 ~ 41 0
72 NGC 7661 AG? 23 27 14.28 -65 16 20.9   14.11   13.16 13.6 ~ 47 0
73 NAME Local Group GrG ~ ~           ~ 9325 0

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