2012ApJ...759...77M

Query : 2012ApJ...759...77M

2012ApJ...759...77M - Astrophys. J., 759, 77 (2012/November-1)

The nature of starbursts. III. The spatial distribution of star formation.

McQUINN K.B.W., SKILLMAN E.D., DALCANTON J.J., CANNON J.M., DOLPHIN A.E., HOLTZMAN J., WEISZ D.R. and WILLIAMS B.F.

Abstract (from CDS):

We map the spatial distribution of recent star formation over a few x100 Myr timescales in 15 starburst dwarf galaxies using the location of young blue helium burning stars identified from optically resolved stellar populations in archival Hubble Space Telescope observations. By comparing the star formation histories from both the high surface brightness central regions and the diffuse outer regions, we measure the degree to which the star formation has been centrally concentrated during the galaxies' starbursts, using three different metrics for the spatial concentration. We find that the galaxies span a full range in spatial concentration, from highly centralized to broadly distributed star formation. Since most starbursts have historically been identified by relatively short timescale star formation tracers (e.g., Hα emission), there could be a strong bias toward classifying only those galaxies with recent, centralized star formation as starbursts, while missing starbursts that are spatially distributed.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: starburst

Simbad objects: 22

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Number of rows : 22
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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 NGC 625 AGN 01 35 04.632 -41 26 10.32 12.37 11.78 11.25 11.03 11.5 ~ 312 2
3 NGC 784 LSB 02 01 16.932 +28 50 14.13 12.97 12.50 12.07 11.83   ~ 212 0
4 ESO 154-23 AG? 02 56 50.38 -54 34 17.1   12.63   12.18 12.5 ~ 123 0
5 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
7 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
8 UGC 4305 IG 08 19 04.9864630512 +70 43 13.086910452 12.06 11.72 11.39 11.11   ~ 812 2
9 Z 331-51 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 316 0
10 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 809 1
11 Z 351-62 bCG 11 27 59.90 +78 59 39.0   14.50       ~ 346 1
12 NGC 4068 AG? 12 04 03.265 +52 35 26.05   13.29   12.77   ~ 189 0
13 NGC 4163 LSB 12 12 09.34 +36 10 08.1 14.33 13.70 13.2 12.98   ~ 238 0
14 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 1017 1
15 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1192 1
16 Z 316-9 AG? 13 06 24.85 +67 42 25.0 14.08 13.61 13.08 12.98   ~ 268 1
17 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
18 Z 133-19 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 296 0
19 Z 219-66 QSO 14 17 01.716 +43 30 13.52   15.6       ~ 181 0
20 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 253 4
21 NGC 6789 AG? 19 16 41.169 +63 58 23.90   13.76       ~ 122 1
22 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0

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