A multifrequency radio continuum study of the Magellanic Clouds - I. Overall structure and star formation rates

For, BQ; Staveley-Smith, L; Hurley-Walker, N; Franzen, T; Kapińska, AD; Filipović, MD; Collier, JD; Wu, C; Grieve, K; Callingham, JR; Bell, ME; Bernardi, G; Bowman, JD; Briggs, F; Cappallo, RJ; Deshpande, AA; Dwarakanath, KS; Gaensler, BM; Greenhill, LJ; Hancock, P; Hazelton, BJ; Hindson, L; Johnston-Hollitt, M; Kaplan, DL; Lenc, E; Lonsdale, CJ; McKinley, B; McWhirter, SR; Mitchell, DA; Morales, MF; Morgan, E; Morgan, J; Oberoi, D; Offringa, A; Ord, SM; Prabu, T; Procopio, P; Udaya Shankar, N; Srivani, KS; Subrahmanyan, R; Tingay, SJ; Wayth, RB; Webster, RL; Williams, A; Williams, CL; Zheng, Q

A multifrequency radio continuum study of the Magellanic Clouds - I. Overall structure and star formation rates

For, BQ Staveley-Smith, L Hurley-Walker, N Franzen, T Kapińska, AD Filipović, MD Collier, JD Wu, C Grieve, K Callingham, JR Bell, ME

Bernardi, G Bowman, JD Briggs, F Cappallo, RJ Deshpande, AA Dwarakanath, KS Gaensler, BM Greenhill, LJ Hancock, P Hazelton, BJ Hindson, L Johnston-Hollitt, M Kaplan, DL Lenc, E Lonsdale, CJ McKinley, B McWhirter, SR Mitchell, DA Morales, MF Morgan, E Morgan, J Oberoi, D Offringa, A Ord, SM Prabu, T Procopio, P Udaya Shankar, N Srivani, KS Subrahmanyan, R Tingay, SJ Wayth, RB Webster, RL Williams, A Williams, CL Zheng, Q

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Publication Type:: Journal Article
Citation:: Monthly Notices of the Royal Astronomical Society, 2018, 480 (2), pp. 2743 - 2756
Issue Date:: 2018-10-01

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Field	Value	Language
dc.contributor.author	For, BQ	en_US
dc.contributor.author	Staveley-Smith, L	en_US
dc.contributor.author	Hurley-Walker, N	en_US
dc.contributor.author	Franzen, T	en_US
dc.contributor.author	Kapińska, AD	en_US
dc.contributor.author	Filipović, MD	en_US
dc.contributor.author	Collier, JD	en_US
dc.contributor.author	Wu, C	en_US
dc.contributor.author	Grieve, K	en_US
dc.contributor.author	Callingham, JR	en_US
dc.contributor.author	Bell, ME https://orcid.org/0000-0003-1767-5277	en_US
dc.contributor.author	Bernardi, G	en_US
dc.contributor.author	Bowman, JD	en_US
dc.contributor.author	Briggs, F	en_US
dc.contributor.author	Cappallo, RJ	en_US
dc.contributor.author	Deshpande, AA	en_US
dc.contributor.author	Dwarakanath, KS	en_US
dc.contributor.author	Gaensler, BM	en_US
dc.contributor.author	Greenhill, LJ	en_US
dc.contributor.author	Hancock, P	en_US
dc.contributor.author	Hazelton, BJ	en_US
dc.contributor.author	Hindson, L	en_US
dc.contributor.author	Johnston-Hollitt, M	en_US
dc.contributor.author	Kaplan, DL	en_US
dc.contributor.author	Lenc, E	en_US
dc.contributor.author	Lonsdale, CJ	en_US
dc.contributor.author	McKinley, B	en_US
dc.contributor.author	McWhirter, SR	en_US
dc.contributor.author	Mitchell, DA	en_US
dc.contributor.author	Morales, MF	en_US
dc.contributor.author	Morgan, E	en_US
dc.contributor.author	Morgan, J	en_US
dc.contributor.author	Oberoi, D	en_US
dc.contributor.author	Offringa, A	en_US
dc.contributor.author	Ord, SM	en_US
dc.contributor.author	Prabu, T	en_US
dc.contributor.author	Procopio, P	en_US
dc.contributor.author	Udaya Shankar, N	en_US
dc.contributor.author	Srivani, KS	en_US
dc.contributor.author	Subrahmanyan, R	en_US
dc.contributor.author	Tingay, SJ	en_US
dc.contributor.author	Wayth, RB	en_US
dc.contributor.author	Webster, RL	en_US
dc.contributor.author	Williams, A	en_US
dc.contributor.author	Williams, CL	en_US
dc.contributor.author	Zheng, Q	en_US
dc.date.issued	2018-10-01	en_US
dc.identifier.citation	Monthly Notices of the Royal Astronomical Society, 2018, 480 (2), pp. 2743 - 2756	en_US
dc.identifier.issn	0035-8711	en_US
dc.identifier.uri	http://hdl.handle.net/10453/128477
dc.description.abstract	© 2018 The Author(s). We present the first low-frequency Murchison Widefield Array (MWA) radio continuum maps of the Magellanic Clouds (MCs), usingmosaics from the GaLactic Extragalactic All-SkyMWA (GLEAM) survey. In this paper, we discuss the overall radio continuum morphology between 76 and 227 MHz and compare them with neutral hydrogen maps, 1.4 GHz continuum maps and optical images. Variation of diffuse emission is noticeable across the Large Magellanic Cloud (LMC) but absent across the bar of the Small Magellanic Cloud (SMC). We also measure the integrated flux densities and derive the spectral indices for the MCs. A double power-law model with fixed α1 = -0.1 fit between 19.7 MHz and 8.55 GHz yields α0 = -0.66 ± 0.08 for the LMC. A power-law model yields α8.55GHz85.5MHz = -0.82 ± 0.03 for the SMC. The radio spectral index maps reveal distinctive flat and steep spectral indices for the HII regions and supernova remnants, respectively. We find strong correlation between HII regions and Ha emission. Using a new 150 MHz-Hα relation as a star formation rate indicator, we estimate global star formation rates of 0.068-0.161 M⊙ yr-1 and 0.021-0.050 M⊙ yr-1 for the LMC and SMC, respectively. Images in 20 frequency bands, and wideband averages are made available via the GLEAM virtual observatory server.	en_US
dc.relation.ispartof	Monthly Notices of the Royal Astronomical Society	en_US
dc.relation.isbasedon	10.1093/MNRAS/STY1960	en_US
dc.subject.classification	Astronomy & Astrophysics	en_US
dc.title	A multifrequency radio continuum study of the Magellanic Clouds - I. Overall structure and star formation rates	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	480	en_US
utslib.for	0201 Astronomical and Space Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	480	en_US

Abstract:

© 2018 The Author(s). We present the first low-frequency Murchison Widefield Array (MWA) radio continuum maps of the Magellanic Clouds (MCs), usingmosaics from the GaLactic Extragalactic All-SkyMWA (GLEAM) survey. In this paper, we discuss the overall radio continuum morphology between 76 and 227 MHz and compare them with neutral hydrogen maps, 1.4 GHz continuum maps and optical images. Variation of diffuse emission is noticeable across the Large Magellanic Cloud (LMC) but absent across the bar of the Small Magellanic Cloud (SMC). We also measure the integrated flux densities and derive the spectral indices for the MCs. A double power-law model with fixed α1 = -0.1 fit between 19.7 MHz and 8.55 GHz yields α0 = -0.66 ± 0.08 for the LMC. A power-law model yields α8.55GHz85.5MHz = -0.82 ± 0.03 for the SMC. The radio spectral index maps reveal distinctive flat and steep spectral indices for the HII regions and supernova remnants, respectively. We find strong correlation between HII regions and Ha emission. Using a new 150 MHz-Hα relation as a star formation rate indicator, we estimate global star formation rates of 0.068-0.161 M⊙ yr-1 and 0.021-0.050 M⊙ yr-1 for the LMC and SMC, respectively. Images in 20 frequency bands, and wideband averages are made available via the GLEAM virtual observatory server.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/128477