☆ 4.7 Article

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

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2014)

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Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 445, Issue 2, Pages 1104-1113

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1820

Keywords

techniques: spectroscopic; H II regions; galaxies: dwarf; galaxies: evolution; galaxies: starburst; galaxies: star formation

Categories

Astronomy & Astrophysics

Funding

  1. Australian Research Council Centre of Excellence for All-sky Astrophysics (CAASTRO) [CE110001020]
  2. Australian Research Council (ARC) Centre of Excellence program
  3. NSW State Government's Science Leveraging Fund
  4. Alfred P. Sloan Foundation
  5. National Science Foundation
  6. U.S. Department of Energy Office of Science
  7. Commonwealth of Australia
  8. ARC Future fellowship [FT100100457]
  9. Science and Industry Endowment Fund (Australia)
  10. ARC Super Science Fellowship [FS110200013]
  11. Australian Research Council through a Super Science Fellowship [ARC FS110200023]
  12. Australian Research Council [FS110200013] Funding Source: Australian Research Council

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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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