2012MNRAS.423..294M

Query : 2012MNRAS.423..294M

2012MNRAS.423..294M - Mon. Not. R. Astron. Soc., 423, 294-303 (2012/June-2)

Star formation history and environment of the dwarf galaxy UGCA 92.

MAKAROVA L., MAKAROV D. and SAVCHENKO S.

Abstract (from CDS):

We present a quantitative star formation history of the nearby dwarf galaxy UGCA 92. This irregular dwarf is situated in the vicinity of the Local Group of galaxies in a zone of strong Galactic extinction (IC 342 group of galaxies). The galaxy was resolved into stars, including the old red giant branch, with HST/ACS. We constructed a model of the resolved stellar populations and measured the star formation rate and metallicity as functions of time. The main star formation activity period occurred about 8-14 Gyr ago. These stars are mostly metal-poor, with a mean metallicity [Fe/H] ∼ -1.5 to -2.0 dex. About 84 per cent of the total stellar mass was formed during this event. There are also indications of recent star formation starting about 1.5 Gyr ago and continuing to the present. The star formation in this event shows moderate enhancement from ∼ 200 to 300 Myr ago. It is very likely that the ongoing star formation period has a higher metallicity of about -0.6 to -0.3 dex. UGCA 92 is often considered to be the companion to the starburst galaxy NGC 1569. A comparison of our star formation history of UGCA 92 with that of NGC 1569 reveals no causal or temporal connection between recent star formation events in these two galaxies. We suggest that the starburst phenomenon in NGC 1569 is not related to the galaxy's closest dwarf neighbours and does not affect their star formation history.

Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: formation - galaxies: individual: UGCA 92 - galaxies: stellar content

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 - 2026 		#notes
1 NAME Cas 1 G 02 06 07.9 +69 00 36     14.62     ~ 53 0
2 UGCA 34 GiG 02 36 35.4662282832 +59 39 17.507008584   17       ~ 198 2
3 UGCA 39 GiG 02 41 55.092 +59 36 14.73   16       ~ 360 1
4 NAME Cas 2 GiG 02 56 51.6359356200 +58 54 42.136879608           ~ 84 0
5 LEDA 166077 LSB 03 45 13.7 +67 51 58           ~ 37 0
6 IC 342 AGN 03 46 48.514 +68 05 45.98   10.5       ~ 1579 1
7 NAME IC 342 Group GrG 03 48 42 +68 00.8           ~ 102 1
8 UGCA 86 AG? 03 59 48.30 +67 08 18.6   14.2 14.2     ~ 110 0
9 NAME Camel Galaxy LSB 04 25 16.6 +72 48 24   14.85       ~ 59 0
10 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
11 NAME NGC 1569 HI Bridge HI 04 31 17 +64 47.3           ~ 6 0
12 UGCA 92 AG? 04 32 03.8366 +63 36 51.243   16.15       ~ 128 0
13 NGC 1560 GiG 04 32 49.087 +71 52 59.20   12.1       ~ 264 0
14 NAME Cam B G 04 53 07.1 +67 05 57   16.71       ~ 79 0
15 Z 283-4 GiG 05 14 15.3240846648 +62 34 47.964904644   15.3       ~ 90 1
16 LEDA 95597 LSB 06 47 45.6 +80 07 27   16.4       ~ 74 0
17 NAME Local Group GrG ~ ~           ~ 9325 0

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