2018ApJ...855....7H

Query : 2018ApJ...855....7H

2018ApJ...855....7H - Astrophys. J., 855, 7-7 (2018/March-1)

A study of two dwarf irregular galaxies with asymmetrical star formation distributions.

HUNTER D.A., GALLARDO S., ZHANG H.-X., ADAMO A., COOK D.O., OH S.-H., ELMEGREEN B.G., KIM H., KAHRE L., UBEDA L., BRIGHT S.N., RYON J.E., FUMAGALLI M., SACCHI E., KENNICUTT R.C., TOSI M., DALE D.A., CIGNONI M., MESSA M., GREBEL E.K., GOULIERMIS D.A., SABBI E., GRASHA K., GALLAGHER J.S., CALZETTI D. and LEE J.C.

Abstract (from CDS):

Two dwarf irregular galaxies, DDO 187 and NGC 3738, exhibit a striking pattern of star formation: intense star formation is taking place in a large region occupying roughly half of the inner part of the optical galaxy. We use data on the H I distribution and kinematics and stellar images and colors to examine the properties of the environment in the high star formation rate (HSF) halves of the galaxies in comparison with the low star formation rate halves. We find that the pressure and gas density are higher on the HSF sides by 30%-70%. In addition we find in both galaxies that the H I velocity fields exhibit significant deviations from ordered rotation and there are large regions of high-velocity dispersion and multiple velocity components in the gas beyond the inner regions of the galaxies. The conditions in the HSF regions are likely the result of large-scale external processes affecting the internal environment of the galaxies and enabling the current star formation there.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: dwarf - galaxies: individual: (DDO 187, NGC 3738) - galaxies: star formation

Nomenclature: Table 2: [HGZ2018] N (Nos 1-6).

Simbad objects: 17

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Number of rows : 17
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 IC 10 G 00 20 25.50 +59 17 17.0   13.6 9.5     ~ 1119 1
2 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1736 1
3 NGC 1569 IG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1241 3
4 NGC 2207 AG? 06 16 22.0336889136 -21 22 21.759218400   11.48 10.65 10.21 11.9 ~ 289 3
5 IC 2163 AG? 06 16 27.9671433048 -21 22 33.133211832   12.55   11.28   ~ 165 2
6 NGC 3738 AGN 11 35 48.982 +54 31 24.70   12.12 12.04 11.56   ~ 280 0
7 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1922 1
8 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4330 4
9 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2576 2
10 [HGZ2018] 5 Cl* 14 15 54.95 +23 03 00.1 20.71 22.06 21.33   21.98 ~ 1 0
11 [HGZ2018] 4 Cl* 14 15 55.03 +23 03 02.7 21.20 22.43 21.92   22.16 ~ 1 0
12 [HGZ2018] 2 Cl* 14 15 55.67 +23 03 21.5 23.15 23.80 22.47   21.83 ~ 1 0
13 [HGZ2018] 1 Cl* 14 15 56.17 +23 03 25.5 22.27 22.88 21.83   21.64 ~ 1 0
14 UGC 9128 AG? 14 15 57.0834 +23 03 29.871 15.40 14.77 14.41 14.32   ~ 283 0
15 [HGZ2018] 3 Cl* 14 15 57.09 +23 03 03.5 21.56 22.96 22.25   22.71 ~ 1 0
16 [HGZ2018] 6 Cl* 14 15 57.21 +23 02 58.1 21.34 22.85 22.20   22.52 ~ 1 0
17 AGC 249525 HVC 14 17 53.4 +17 32 42           ~ 6 0

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