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

For, B.; Staveley-Smith, L.; Hurley-Walker, Natasha; Franzen, Thomas; Kapinska, A.; Filipovic, M.; Collier, J.; Wu, C.; Grieve, K.; Callingham, J.; Bell, M.; Bernardi, G.; Bowman, J.; Briggs, F.; Cappallo, R.; Deshpande, A.; Dwarakanath, K.; Gaensler, B.; Greenhill, L.; Hancock, Paul; Hazelton, B.; Hindson, L.; Johnston-Hollitt, M.; Kaplan, D.; Lenc, E.; Lonsdale, C.; McKinley, B.; McWhirter, S.; Mitchell, D.; Morales, M.; Morgan, E.; Morgan, John; Oberoi, D.; Offringa, A.; Ord, S.; Prabu, T.; Procopio, P.; Udaya Shankar, N.; Srivani, K.; Subrahmanyan, R.; Tingay, Steven; Wayth, Randall; Webster, R.; Williams, Andrew; Williams, C.; Zheng, Q.

doi:10.1093/MNRAS/STY1960

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Open access

Authors

For, B.

Staveley-Smith, L.

Hurley-Walker, Natasha

Franzen, Thomas

Kapinska, A.

Filipovic, M.

Collier, J.

Wu, C.

Grieve, K.

Callingham, J.

Bell, M.

Bernardi, G.

Bowman, J.

Briggs, F.

Cappallo, R.

Deshpande, A.

Dwarakanath, K.

Gaensler, B.

Greenhill, L.

Hancock, Paul

Hazelton, B.

Hindson, L.

Johnston-Hollitt, M.

Kaplan, D.

Lenc, E.

Lonsdale, C.

McKinley, B.

McWhirter, S.

Mitchell, D.

Morales, M.

Morgan, E.

Morgan, John

Oberoi, D.

Offringa, A.

Ord, S.

Prabu, T.

Procopio, P.

Udaya Shankar, N.

Srivani, K.

Subrahmanyan, R.

Tingay, Steven

Wayth, Randall

Webster, R.

Williams, Andrew

Williams, C.

Zheng, Q.

Date

2018

Type

Journal Article

Metadata

Show full item record

Citation

For, B. and Staveley-Smith, L. and Hurley-Walker, N. and Franzen, T. and Kapinska, A. and Filipovic, M. and Collier, J. et al. 2018. A multifrequency radio continuum study of the Magellanic Clouds - I. Overall structure and star formation rates. Monthly Notices of the Royal Astronomical Society. 480 (2): pp. 2743-2756.

Source Title

Monthly Notices of the Royal Astronomical Society

DOI

10.1093/MNRAS/STY1960

ISSN

0035-8711

School

Curtin Institute of Radio Astronomy (Physics)

Remarks

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

URI

http://hdl.handle.net/20.500.11937/73489

Collection

Curtin Research Publications

Abstract

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 a1 = -0.1 fit between 19.7 MHz and 8.55 GHz yields a0 = -0.66 ± 0.08 for the LMC. A power-law model yields a8.55GHz85.5MHz = -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-Ha 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.