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

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

doi:10.1093/MNRAS/STY1960

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

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

CLAS-NS: Earth and Space Exploration, School of (SESE)

Research output: Contribution to journal › Article

5 Scopus citations

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 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 α_8.55GHz ^85.5MHz = -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-H_α 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.

Original language	English (US)
Pages (from-to)	2743-2756
Number of pages	14
Journal	Monthly Notices of the Royal Astronomical Society
Volume	480
Issue number	2
DOIs	https://doi.org/10.1093/MNRAS/STY1960
State	Published - Oct 2018

Keywords

Magellanic Clouds
Radiation mechanisms: non-thermal
Radiation mechanisms: thermal
Radio continuum: galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/MNRAS/STY1960

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For, B. Q., Staveley-Smith, L., Hurley-Walker, N., Franzen, T., Kapińska, A. D., Filipović, M. D., Collier, J. D., Wu, C., Grieve, K., Callingham, J. R., Bell, M. E., Bernardi, G., Bowman, J., Briggs, F., Cappallo, R. J., Deshpande, A. A., Dwarakanath, K. S., Gaensler, B. M., Greenhill, L. J., ... Zheng, Q. (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), 2743-2756. https://doi.org/10.1093/MNRAS/STY1960

A multifrequency radio continuum study of the Magellanic Clouds - I. Overall structure and star formation rates. / For, B. Q.; Staveley-Smith, L.; Hurley-Walker, N.; Franzen, T.; Kapińska, A. D.; Filipović, M. D.; Collier, J. D.; Wu, C.; Grieve, K.; Callingham, J. R.; Bell, M. E.; Bernardi, G.; Bowman, Judd; Briggs, F.; Cappallo, R. J.; Deshpande, A. A.; Dwarakanath, K. S.; Gaensler, B. M.; Greenhill, L. J.; Hancock, P.; Hazelton, B. J.; Hindson, L.; Johnston-Hollitt, M.; Kaplan, D. L.; Lenc, E.; Lonsdale, C. J.; McKinley, B.; McWhirter, S. R.; Mitchell, D. A.; Morales, M. F.; Morgan, E.; Morgan, J.; Oberoi, D.; Offringa, A.; Ord, S. M.; Prabu, T.; Procopio, P.; Udaya Shankar, N.; Srivani, K. S.; Subrahmanyan, R.; Tingay, S. J.; Wayth, R. B.; Webster, R. L.; Williams, A.; Williams, C. L.; Zheng, Q.

In: Monthly Notices of the Royal Astronomical Society, Vol. 480, No. 2, 10.2018, p. 2743-2756.

Research output: Contribution to journal › Article

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, J, 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 2018, 'A multifrequency radio continuum study of the Magellanic Clouds - I. Overall structure and star formation rates', Monthly Notices of the Royal Astronomical Society, vol. 480, no. 2, pp. 2743-2756. https://doi.org/10.1093/MNRAS/STY1960

For, B. Q. ; Staveley-Smith, L. ; Hurley-Walker, N. ; Franzen, T. ; Kapińska, A. D. ; Filipović, M. D. ; Collier, J. D. ; Wu, C. ; Grieve, K. ; Callingham, J. R. ; Bell, M. E. ; Bernardi, G. ; Bowman, Judd ; Briggs, F. ; Cappallo, R. J. ; Deshpande, A. A. ; Dwarakanath, K. S. ; Gaensler, B. M. ; Greenhill, L. J. ; Hancock, P. ; Hazelton, B. J. ; Hindson, L. ; Johnston-Hollitt, M. ; Kaplan, D. L. ; Lenc, E. ; Lonsdale, C. J. ; McKinley, B. ; McWhirter, S. R. ; Mitchell, D. A. ; Morales, M. F. ; Morgan, E. ; Morgan, J. ; Oberoi, D. ; Offringa, A. ; Ord, S. M. ; Prabu, T. ; Procopio, P. ; Udaya Shankar, N. ; Srivani, K. S. ; Subrahmanyan, R. ; Tingay, S. J. ; Wayth, R. B. ; Webster, R. L. ; Williams, A. ; Williams, C. L. ; Zheng, Q. / A multifrequency radio continuum study of the Magellanic Clouds - I. Overall structure and star formation rates. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 480, No. 2. pp. 2743-2756.

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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 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 α8.55GHz 85.5MHz = -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.",

keywords = "Magellanic Clouds, Radiation mechanisms: non-thermal, Radiation mechanisms: thermal, Radio continuum: galaxies",

author = "For, {B. Q.} and L. Staveley-Smith and N. Hurley-Walker and T. Franzen and Kapi{\'n}ska, {A. D.} and Filipovi{\'c}, {M. D.} and Collier, {J. D.} and C. Wu and K. Grieve and Callingham, {J. R.} and Bell, {M. E.} and G. Bernardi and Judd Bowman and F. Briggs and Cappallo, {R. J.} and Deshpande, {A. A.} and Dwarakanath, {K. S.} and Gaensler, {B. M.} and Greenhill, {L. J.} and P. Hancock and Hazelton, {B. J.} and L. Hindson and M. Johnston-Hollitt and Kaplan, {D. L.} and E. Lenc and Lonsdale, {C. J.} and B. McKinley and McWhirter, {S. R.} and Mitchell, {D. A.} and Morales, {M. F.} and E. Morgan and J. Morgan and D. Oberoi and A. Offringa and Ord, {S. M.} and T. Prabu and P. Procopio and {Udaya Shankar}, N. and Srivani, {K. S.} and R. Subrahmanyan and Tingay, {S. J.} and Wayth, {R. B.} and Webster, {R. L.} and A. Williams and Williams, {C. L.} and Q. Zheng",

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T1 - A multifrequency radio continuum study of the Magellanic Clouds - I. Overall structure and star formation rates

AU - For, B. Q.

AU - Staveley-Smith, L.

AU - Hurley-Walker, N.

AU - Franzen, T.

AU - Kapińska, A. D.

AU - Filipović, M. D.

AU - Collier, J. D.

AU - Wu, C.

AU - Grieve, K.

AU - Callingham, J. R.

AU - Bell, M. E.

AU - Bernardi, G.

AU - Bowman, Judd

AU - Briggs, F.

AU - Cappallo, R. J.

AU - Deshpande, A. A.

AU - Dwarakanath, K. S.

AU - Gaensler, B. M.

AU - Greenhill, L. J.

AU - Hancock, P.

AU - Hazelton, B. J.

AU - Hindson, L.

AU - Johnston-Hollitt, M.

AU - Kaplan, D. L.

AU - Lenc, E.

AU - Lonsdale, C. J.

AU - McKinley, B.

AU - McWhirter, S. R.

AU - Mitchell, D. A.

AU - Morales, M. F.

AU - Morgan, E.

AU - Morgan, J.

AU - Oberoi, D.

AU - Offringa, A.

AU - Ord, S. M.

AU - Prabu, T.

AU - Procopio, P.

AU - Udaya Shankar, N.

AU - Srivani, K. S.

AU - Subrahmanyan, R.

AU - Tingay, S. J.

AU - Wayth, R. B.

AU - Webster, R. L.

AU - Williams, A.

AU - Williams, C. L.

AU - Zheng, Q.

PY - 2018/10

Y1 - 2018/10

N2 - 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 α8.55GHz 85.5MHz = -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.

AB - 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 α8.55GHz 85.5MHz = -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.

KW - Magellanic Clouds

KW - Radiation mechanisms: non-thermal

KW - Radiation mechanisms: thermal

KW - Radio continuum: galaxies

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JF - Monthly Notices of the Royal Astronomical Society

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