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Title:
A Large-Scale, Low-Frequency Murchison Widefield Array Survey of Galactic H ii Regions between 260 < l < 340
Authors:
Hindson, L.; Johnston-Hollitt, M.; Hurley-Walker, N.; Callingham, J. R.; Su, H.; Morgan, J.; Bell, M.; Bernardi, G.; 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.; Kapinska, 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.
Affiliation:
AA(School of Chemical & Physical Sciences, Victoria University of Wellington, Wellington 6140, New Zealand; Centre for Astrophysics Research, School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK), AB(School of Chemical & Physical Sciences, Victoria University of Wellington, Wellington 6140, New Zealand), AC(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AD(Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; CSIRO Astronomy and Space Science (CASS), PO Box 76, Epping, NSW 1710, Australia), AE(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AF(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), AG(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; CSIRO Astronomy and Space Science (CASS), PO Box 76, Epping, NSW 1710, Australia), AH(Square Kilometre Array South Africa (SKA SA), Cape Town 7405, South Africa; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown 6140, South Africa), AI(School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA), AJ(Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia), AK(MIT Haystack Observatory, Westford, MA 01886, USA), AL(Raman Research Institute, Bangalore 560080, India), AM(Raman Research Institute, Bangalore 560080, India), AN(International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia), AO(Dunlap Institute for Astronomy and Astrophysics, University of Toronto, ON, M5S 3H4, Canada; Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), AP(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA), AQ(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), AR(Department of Physics, University of Washington, Seattle, WA 98195, USA), AS(International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), AT(Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA), AU(Sydney Institute for Astronomy, School of Physics, The University of Sydney, NSW 2006, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), AV(MIT Haystack Observatory, Westford, MA 01886, USA), AW(ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia), AX(MIT Haystack Observatory, Westford, MA 01886, USA), AY(School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia; CSIRO Astronomy and Space Science (CASS), PO Box 76, Epping, NSW 1710, Australia), AZ(Department of Physics, University of Washington, Seattle, WA 98195, USA), BA(Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA), BB(National Centre for Radio Astrophysics, Tata Institute for Fundamental Research, Pune 411007, India), BC(Netherlands Institute for Radio Astronomy (ASTRON), PO Box 2, 7990 AA Dwingeloo, The Netherlands), BD(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), BE(School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), BF(Raman Research Institute, Bangalore 560080, India), BG(Raman Research Institute, Bangalore 560080, India), BH(Raman Research Institute, Bangalore 560080, India), BI(International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), BJ(Raman Research Institute, Bangalore 560080, India; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), BK(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), BL(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), BM(School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO), Redfern, NSW, Australia), BN(International Centre for Radio Astronomy Research, Curtin University, Bentley, WA 6102, Australia), BO(Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA), BP(International Centre for Radio Astronomy Research, University of Western Australia, Crawley, WA 6009, Australia), BQ(School of Chemical & Physical Sciences, Victoria University of Wellington, Wellington 6140, New Zealand)
Publication:
Publications of the Astronomical Society of Australia, Volume 33, id.e020 17 pp. (PASA Homepage)
Publication Date:
05/2016
Origin:
CUP
Astronomy Keywords:
catalogs, (ISM:) HII regions, radio continuum: ISM
Abstract Copyright:
2016: Astronomical Society of Australia
DOI:
10.1017/pasa.2016.19
Bibliographic Code:
2016PASA...33...20H

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.

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