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. Kapinska; M. D. Filipovic; J. D. Collier; C. Wu; K. Grieve; J. R. Callingham; M. E. Bell; G. Bernardi; J. D. 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. Kapinska, M. D. Filipovic, J. D. Collier, C. Wu, K. Grieve, J. R. Callingham, M. E. Bell, G. Bernardi, J. D. 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

^*Corresponding author for this work

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Abstract

We present the first low-frequency Murchison Widefield Array (MWA) radio continuum maps of the Magellanic Clouds (MCs), using mosaics from the GaLactic Extragalactic All-Sky MWA (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 alpha(1) = -0.1 fit between 19.7 MHz and 8.55 GHz yields alpha(0) = -0.66 +/- 0.08 for the LMC. Apower-law model yields alpha(85.5MHz)(8.55GHz) = -0.82 +/- 0.03 for the SMC. The radio spectral index maps reveal distinctive flat and steep spectral indices for the H IT regions and supernova remnants, respectively. We find strong correlation between H II regions and H, emission. Using a new 150 MHz-H-alpha relation as a star formation rate indicator, we estimate global star formation rates of 0.068-0.161 M-circle dot yr(-1) and 0.021-0.050 M-circle dot 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
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
Publication status	Published - Oct-2018
Externally published	Yes

Keywords

radiation mechanisms: non-thermal
radiation mechanisms: thermal
Magellanic Clouds
radio continuum: galaxies
INITIAL MASS FUNCTION
APERTURE SYNTHESIS
EMISSION
GALAXIES
STELLAR
REGION
SCALE
SKY
LUMINOSITIES
POPULATION

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For, B. .-Q., Staveley-Smith, L., Hurley-Walker, N., Franzen, T., Kapinska, A. D., Filipovic, M. D., Collier, J. D., Wu, C., Grieve, K., Callingham, J. R., Bell, M. E., Bernardi, G., Bowman, J. D., 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

@article{72c0d836860742b89af8466137fe9c87,

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

abstract = "We present the first low-frequency Murchison Widefield Array (MWA) radio continuum maps of the Magellanic Clouds (MCs), using mosaics from the GaLactic Extragalactic All-Sky MWA (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 alpha(1) = -0.1 fit between 19.7 MHz and 8.55 GHz yields alpha(0) = -0.66 +/- 0.08 for the LMC. Apower-law model yields alpha(85.5MHz)(8.55GHz) = -0.82 +/- 0.03 for the SMC. The radio spectral index maps reveal distinctive flat and steep spectral indices for the H IT regions and supernova remnants, respectively. We find strong correlation between H II regions and H, emission. Using a new 150 MHz-H-alpha relation as a star formation rate indicator, we estimate global star formation rates of 0.068-0.161 M-circle dot yr(-1) and 0.021-0.050 M-circle dot 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 = "radiation mechanisms: non-thermal, radiation mechanisms: thermal, Magellanic Clouds, radio continuum: galaxies, INITIAL MASS FUNCTION, APERTURE SYNTHESIS, EMISSION, GALAXIES, STELLAR, REGION, SCALE, SKY, LUMINOSITIES, POPULATION",

author = "For, {B. -Q.} and L. Staveley-Smith and N. Hurley-Walker and T. Franzen and Kapinska, {A. D.} and Filipovic, {M. D.} and Collier, {J. D.} and C. Wu and K. Grieve and Callingham, {J. R.} and Bell, {M. E.} and G. Bernardi and Bowman, {J. D.} 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 Shankar, {N. Udaya} 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",

year = "2018",

month = oct,

doi = "10.1093/mnras/sty1960",

language = "English",

volume = "480",

pages = "2743--2756",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "2",

}

For, B-Q, Staveley-Smith, L, Hurley-Walker, N, Franzen, T, Kapinska, AD, Filipovic, 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, Shankar, NU, 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

TY - JOUR

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 - Kapinska, A. D.

AU - Filipovic, 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, J. D.

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 - Shankar, N. Udaya

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), using mosaics from the GaLactic Extragalactic All-Sky MWA (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 alpha(1) = -0.1 fit between 19.7 MHz and 8.55 GHz yields alpha(0) = -0.66 +/- 0.08 for the LMC. Apower-law model yields alpha(85.5MHz)(8.55GHz) = -0.82 +/- 0.03 for the SMC. The radio spectral index maps reveal distinctive flat and steep spectral indices for the H IT regions and supernova remnants, respectively. We find strong correlation between H II regions and H, emission. Using a new 150 MHz-H-alpha relation as a star formation rate indicator, we estimate global star formation rates of 0.068-0.161 M-circle dot yr(-1) and 0.021-0.050 M-circle dot 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), using mosaics from the GaLactic Extragalactic All-Sky MWA (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 alpha(1) = -0.1 fit between 19.7 MHz and 8.55 GHz yields alpha(0) = -0.66 +/- 0.08 for the LMC. Apower-law model yields alpha(85.5MHz)(8.55GHz) = -0.82 +/- 0.03 for the SMC. The radio spectral index maps reveal distinctive flat and steep spectral indices for the H IT regions and supernova remnants, respectively. We find strong correlation between H II regions and H, emission. Using a new 150 MHz-H-alpha relation as a star formation rate indicator, we estimate global star formation rates of 0.068-0.161 M-circle dot yr(-1) and 0.021-0.050 M-circle dot 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 - radiation mechanisms: non-thermal

KW - radiation mechanisms: thermal

KW - Magellanic Clouds

KW - radio continuum: galaxies

KW - INITIAL MASS FUNCTION

KW - APERTURE SYNTHESIS

KW - EMISSION

KW - GALAXIES

KW - STELLAR

KW - REGION

KW - SCALE

KW - SKY

KW - LUMINOSITIES

KW - POPULATION

U2 - 10.1093/mnras/sty1960

DO - 10.1093/mnras/sty1960

M3 - Article

SN - 0035-8711

VL - 480

SP - 2743

EP - 2756

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

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

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Keywords

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