2010AJ....139..447H

Query : 2010AJ....139..447H

2010AJ....139..447H - Astron. J., 139, 447-475 (2010/February-0)

Galex ultraviolet imaging of dwarf galaxies and star formation rates.

HUNTER D.A., ELMEGREEN B.G. and LUDKA B.C.

Abstract (from CDS):

We present ultraviolet-integrated and azimuthally averaged surface photometric properties of a sample of 44 dwarf irregular (dIm), blue compact dwarf, and Sm galaxies measured from archival near-ultraviolet (NUV) and far-ultraviolet (FUV) images obtained with the Galaxy Evolution Explorer (GALEX). We compare the UV to Hα and V-band properties and convert FUV, Hα, and V-band luminosities into star formation rates (SFRs). We also model the star formation history from colors and compare the integrated SFRs and SFR profiles with radius for these methods. In most galaxies, the UV photometry extends beyond Hα in radius, providing a better measure of the star formation activity in the outer disks. The Hα appears to be lacking in the outer disk because of faintness in low-density gas. The FUV and V-band profiles are continuous with radius, although they sometimes have a kink from a double exponential disk. There is no obvious difference in star formation properties between the inner and outer disks. No disk edges have been observed, even to stellar surface densities as low as 0.1 M☉pc–2 and SFRs as low as 10–4 M☉/yr/kpc2. Galaxies with low H I to luminosity ratios have relatively low FUV compared to V-band emission in the outer parts, suggesting a cessation of star formation there. Galaxies with relatively high H I apparently have fluctuating star formation with a gigayear timescale.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: photometry

CDS comments: In table 1 UGC 11525 is a misprint for UGC 11425.

Simbad objects: 48

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Number of rows : 48
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NAME Pisces I G 01 03 55.0 +21 53 06   16.18 14.3     ~ 404 0
4 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
5 NGC 1156 GiG 02 59 42.8528847264 +25 14 28.352017320 12.13 12.32 11.74     ~ 323 1
6 MCG-03-09-045 EmG 03 28 14.510 -17 25 11.24   14.38   13.82   ~ 61 0
7 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
8 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
9 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 588 3
10 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
11 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
12 NGC 2552 EmG 08 19 20.5355420472 +50 00 34.590204468 13.44 13.00 12.56     ~ 284 1
13 NAME M 81 Dwarf A G 08 23 55.1 +71 01 56   16.5       ~ 209 1
14 MCG+07-18-004 LSB 08 28 28.560 +41 51 27.13   18       ~ 175 0
15 Z 311-8 GiG 08 34 07.20 +66 10 54.0 15.39 15.03 14.70 14.49   ~ 357 2
16 LEDA 86670 LSB 09 37 36.6 +21 46 15           ~ 53 0
17 Z 332-57 LSB 09 40 32.33 +71 10 56.0 14.53 14.00 13.66 13.41   ~ 372 1
18 Z 153-5 AG? 09 56 46.047 +28 49 43.77 14.82 14.74 14.59 14.55 26.509 ~ 252 1
19 Z 36-12 H2G 10 00 00.8217342072 +05 20 09.533389560 12.77 12.25 11.89 11.71   ~ 569 0
20 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
21 Z 153-15 SBG 10 06 18.175 +28 56 41.49   14.64 14.12     ~ 55 0
22 MCG-01-26-030 H2G 10 11 00.5 -04 41 30 12.48 12.13 11.93 11.78   ~ 789 2
23 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 378 1
24 NGC 3377A GiP 10 47 22.4012897592 +14 04 16.697296020 14.17 14.31 13.61 13.51   ~ 150 1
25 NGC 3510 LSB 11 03 43.356 +28 53 13.58   13.6       ~ 199 0
26 Z 351-62 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 346 1
27 Z 214-32 AG? 11 50 52.98254 +38 52 50.6594   13.72 13.9 13.39   ~ 175 0
28 Z 157-55 AG? 11 55 39.7060218792 +31 31 06.535928784   15.7       ~ 138 0
29 IC 2992 bCG 12 05 15.842 +30 51 19.49   14.8       ~ 43 0
30 IC 3059 GiP 12 14 55.197 +13 27 41.01 14.78 14.70 14.19     ~ 100 1
31 Z 244-7 GiG 12 21 15.01 +45 48 40.8   14.8       ~ 123 2
32 Z 244-18 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 364 0
33 Z 187-44 GiP 12 27 05.566 +37 08 30.39   14.19   13.55   ~ 217 0
34 MCG+06-28-024 GiC 12 44 24.881 +34 23 03.33   15.0       ~ 72 0
35 Z 270-22 bCG 12 46 56.426 +51 36 46.80   14.1       ~ 119 0
36 NGC 4707 AG? 12 48 21.666 +51 09 53.81   15.2       ~ 113 0
37 NGC 4789A GiC 12 54 05.248 +27 08 58.67 14.37 14.23 13.95 13.84   ~ 614 1
38 MCG+08-24-090 AG? 13 13 22.839 +46 19 21.71   17       ~ 135 1
39 Z 245-36 AG? 13 14 27.997 +45 55 11.14 13.63 13.26 13.02 12.81   ~ 297 0
40 MCG-02-35-010 AG? 13 38 10.32 -09 48 06.6   12.5   12.05 12.6 ~ 65 0
41 Z 190-66 AG? 13 50 51.3127548768 +38 01 14.958828876 15.56 14.78   14.33   ~ 161 0
42 LEDA 86657 LSB 15 57 27.483 +20 39 59.12           ~ 104 0
43 M 8 OpC 18 03 37 -24 23.2           ~ 644 1
44 NGC 6789 AG? 19 16 41.169 +63 58 23.90   13.76       ~ 122 1
45 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
46 MCG-02-53-003 G 20 46 51.7 -12 50 54 15.75 15.18 14.83 14.46   ~ 470 1
47 MCG-01-57-019 AG? 22 39 08.5247 -04 45 37.429   15.0   15.1 14.8 ~ 49 0
48 Z 431-72 G 23 28 35.2 +14 44 35 13.85 13.16 12.52     ~ 499 1

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