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

被引：22
作者：
Richards, S. N. [1 ,2 ]
Schaefer, A. L. [1 ,2 ]
Lopez-Sanchez, A. R. [2 ,3 ]
Croom, S. M. [1 ]
Bryant, J. J. [2 ]
Sweet, S. M. [4 ]
Konstantopoulos, I. S. [2 ]
Allen, J. T. [1 ]
Bland-Hawthorn, J. [1 ]
Bloom, J. V. [1 ]
Brough, S. [2 ]
Fogarty, L. M. R. [1 ]
Goodwin, M. [2 ]
Green, A. W. [2 ]
Ho, I. -T. [5 ]
Kewley, L. J. [6 ]
Koribalski, B. S. [7 ]
Lawrence, J. S. [2 ]
Owers, M. S. [2 ]
Sadler, E. M. [1 ]
Sharp, R. [5 ]
机构：
[1] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia
[2] Australian Astron Observ, N Ryde, NSW 1670, Australia
[3] Macquarie Univ, Dept Phys & Astron, N Ryde, NSW 2109, Australia
[4] Univ Queensland, Sch Math & Phys, Brisbane, Qld 4072, Australia
[5] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
[6] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia
[7] CSIRO Astron & Space Sci, Australia Telescope Natl Facil, Epping, NSW 1710, Australia
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2014年 / 445卷 / 02期
基金：
澳大利亚研究理事会; 美国国家科学基金会;
关键词：
techniques: spectroscopic; H II regions; galaxies: dwarf; galaxies: evolution; galaxies: starburst; galaxies: star formation; BLUE COMPACT GALAXIES; STAR-FORMATION RATES; H-II REGIONS; WOLF-RAYET GALAXIES; DIGITAL SKY SURVEY; OXYGEN ABUNDANCE DETERMINATION; INFRARED SURFACE PHOTOMETRY; EMISSION-LINE GALAXIES; IRREGULAR GALAXIES; IONIZED-GAS;
D O I：
10.1093/mnras/stu1820
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the discovery of a luminous unresolved H II 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 similar to 100 Mpc and contains an unresolved region of H II emission that contributes similar to 70 per cent of the galaxy's Ha luminosity, located at the top end of established H II region luminosity functions. For the H II complex, we measure a star formation rate of 0.147 +/- 0.041 M-circle dot yr(-1) and a metallicity of 12+log(O/H) = 8.01 +/- 0.05 that is lower than the rest of the galaxy by similar to 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 H II 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.
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页码：1104 / 1113
页数：10
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