2014MNRAS.445.1104R

Query : 2014MNRAS.445.1104R

2014MNRAS.445.1104R - Mon. Not. R. Astron. Soc., 445, 1104-1113 (2014/December-1)

The SAMI Galaxy Survey: the discovery of a luminous, low-metallicity HII complex in the dwarf galaxy GAMA J141103.98-003242.3.

RICHARDS S.N., SCHAEFER A.L., LOPEZ-SANCHEZ A.R., CROOM S.M., BRYANT J.J., SWEET S.M., KONSTANTOPOULOS I.S., ALLEN J.T., BLAND-HAWTHORN J., BLOOM J.V., BROUGH S., FOGARTY L.M.R., GOODWIN M., GREEN A.W., HO I.-T., KEWLEY L.J., KORIBALSKI B.S., LAWRENCE J.S., OWERS M.S., SADLER E.M. and SHARP R.

Abstract (from CDS):

We present the discovery of a luminous unresolved HII complex on the edge of dwarf galaxy GAMA J141103.98-003242.3 using data from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. This dwarf galaxy is situated at a distance of ∼ 100 Mpc and contains an unresolved region of HII emission that contributes ∼ 70 percent of the galaxy's Hα luminosity, located at the top end of established HII region luminosity functions. For the HII complex, we measure a star formation rate of 0.147±0.041 M☉/yrand a metallicity of 12+log(O/H) = 8.01±0.05 that is lower than the rest of the galaxy by ∼ 0.2 dex. Data from the HI Parkes All-Sky Survey (HIPASS) indicate the likely presence of neutral hydrogen in the galaxy to potentially fuel ongoing and future star-forming events. We discuss various triggering mechanisms for the intense star formation activity of this HII complex, where the kinematics of the ionized gas are well described by a rotating disc and do not show any features indicative of interactions. We show that SAMI is an ideal instrument to identify similar systems to GAMA J141103.98-003242.3, and the SAMI Galaxy Survey is likely to find many more of these systems to aid in the understanding of their formation and evolution.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): techniques: spectroscopic - HII regions - galaxies: dwarf - galaxies: evolution - galaxies: starburst - galaxies: star formation

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 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 SBSG 0335-052B G 03 37 44.04 -05 02 40.2   16.77 16.65   16.79 ~ 220 1
4 NGC 1569 rG 04 30 49.186 +64 50 52.52 11.72 11.86 11.03     ~ 1297 3
5 NGC 1705 Sy2 04 54 13.4661493464 -53 21 39.471592428 12.32 12.96 12.56 12.58 12.9 ~ 692 1
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
7 NGC 2070 Cl* 05 38 42 -69 06.0     7.25     ~ 406 1
8 RMC 136 Cl* 05 38 42.396 -69 06 03.36   5.81 5.40     ~ 2236 2
9 UGCA 116 AGN 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 561 0
10 2MASS J12530596-0312588 AGN 12 53 05.965 -03 12 58.88   16.64   16.05   ~ 53 0
11 MCG-05-31-033 EmG 13 05 46.83 -28 25 19.8   14.74   14.06 14.96 ~ 20 0
12 NGC 5113 AG? 13 21 22.57 +57 41 29.5   15.2       ~ 21 0
13 NGC 5253 rG 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33 13.47 ~ 1421 4
14 LEDA 1140731 G 14 11 03.985 -00 32 42.40   18.858   18.283   ~ 16 0
15 SDSS J141120.29-002950.8 G 14 11 20.29723 -00 29 50.7968   18.381   17.144   ~ 14 0
16 IC 4662 bCG 17 47 09.192 -64 38 19.25   11.75 11.1 10.45   ~ 253 4
17 NAME Local Group GrG ~ ~           ~ 9325 0

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