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

Journal
Date Issued
2016
Author(s)
Hindson, L.
•
Johnston-Hollitt, M.
•
Hurley-Walker, N.
•
Callingham, J. R.
•
Su, H.
•
Morgan, J.
•
Bell, M.
•
•
Bowman, J. D.
•
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.
•
Kaplan, D. L.
•
Lenc, E.
•
Lonsdale, C. J.
•
Mckinley, B.
•
McWhirter, S. R.
•
Mitchell, D. A.
•
Morales, M. F.
•
Morgan, E.
•
Oberoi, D.
•
Offringa, A.
•
Ord, S. M.
•
Procopio, P.
•
Prabu, T.
•
Shankar, N. Udaya
•
Srivani, K. S.
•
Staveley-Smith, L.
•
Subrahmanyan, R.
•
Tingay, S. J.
•
Wayth, R. B.
•
Webster, R. L.
•
Williams, A.
•
Williams, C. L.
•
Wu, C.
•
Zheng, Q.
DOI
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.
Volume
33
Start page
e020
Uri
Url
Issn Identifier
1448-6083
Ads BibCode
2016PASA...33...20H
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restricted
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