Journal article
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, JR Callingham, H Su, J Morgan, M Bell, G Bernardi, JD Bowman, F Briggs, RJ Cappallo, AA Deshpande, KS Dwarakanath, BQ For, BM Gaensler, LJ Greenhill, P Hancock, BJ Hazelton, AD Kapinska, DL Kaplan Show all
Publications of the Astronomical Society of Australia | CAMBRIDGE UNIV PRESS | Published : 2016
DOI: 10.1017/pasa.2016.19
Open access
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 cata..
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Funding Acknowledgements
LH was partially supported in this work via grant MED E1799 (PI: Johnston-Hollitt) provided by the Ministry of Business, Employment & Innovation, New Zealand. MJ-H acknowledges support from the Marsden Fund. This scientific work makes use of the Murchison Radio-astronomy Observatory, operated by CSIRO. We acknowledge the Wajarri Yamatji people as the traditional owners of the Observatory site. We acknowledge the iVEC Petabyte Data Store, the Initiative in Innovative Computing and the CUDA Center for Excellence sponsored by NVIDIA at Harvard University. The authors thank the referee for their very useful comments that resulted in the improvement of this paper.