A Large-Scale, Low-Frequency Murchison Widefield Array Survey of Galactic H ii Regions between 260 <l <340

L. Hindson, M. Johnston-Hollitt, N. Hurley-Walker, J. R. Callingham, H. Su, J. Morgan, M. Bell, G. Bernardi, Judd Bowman, F. Briggs, R. J. Cappallo, A. A. Deshpande, K. S. Dwarakanath, B. Q. For, B. M. Gaensler, L. J. Greenhill, P. Hancock, B. J. Hazelton, A. D. Kapińska, D. L. KaplanE. Lenc, C. J. Lonsdale, B. Mckinley, S. R. McWhirter, D. A. Mitchell, M. F. Morales, E. Morgan, D. Oberoi, A. Offringa, S. M. Ord, P. Procopio, T. Prabu, N. Udaya Shankar, K. S. Srivani, L. Staveley-Smith, R. Subrahmanyan, S. J. Tingay, R. B. Wayth, R. L. Webster, A. Williams, C. L. Williams, C. Wu, Q. Zheng

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

We have compiled a catalogue of H ii regions detected with the Murchison Widefield Array between 72 and 231 MHz. The multiple frequency bands provided by the Murchison Widefield Array allow us identify the characteristic spectrum generated by the thermal Bremsstrahlung process in H ii regions. We detect 306 H ii regions between 260° <l <340° and report on the positions, sizes, peak, integrated flux density, and spectral indices of these H ii regions. By identifying the point at which H ii regions transition from the optically thin to thick regime, we derive the physical properties including the electron density, ionised gas mass, and ionising photon flux, towards 61 H ii regions. This catalogue of H ii regions represents the most extensive and uniform low frequency survey of H ii regions in the Galaxy to date.

Original languageEnglish (US)
JournalPublications of the Astronomical Society of Australia
DOIs
StateAccepted/In press - May 17 2016

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Keywords

  • catalogs – (ISM:) HII regions – radio continuum: ISM

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hindson, L., Johnston-Hollitt, M., Hurley-Walker, N., Callingham, J. R., Su, H., Morgan, J., Bell, M., Bernardi, G., Bowman, J., Briggs, F., Cappallo, R. J., Deshpande, A. A., Dwarakanath, K. S., For, B. Q., Gaensler, B. M., Greenhill, L. J., Hancock, P., Hazelton, B. J., Kapińska, A. D., ... Zheng, Q. (Accepted/In press). A Large-Scale, Low-Frequency Murchison Widefield Array Survey of Galactic H ii Regions between 260 <l <340. Publications of the Astronomical Society of Australia. https://doi.org/10.1017/pasa.2016.19