The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667

L. Hindson; M. Johnston-Hollitt; N. Hurley-Walker; K. Buckley; J. Morgan; E. Carretti; K. S. Dwarakanath; M. Bell; G. Bernardi; N. D. R. Bhat; J. D. Bowman; F. Briggs; R. J. Cappallo; B. E. Corey; A. A. Deshpande; D. Emrich; A. Ewall-Wice; L. Feng; B. M. Gaensler; R. Goeke; L. J. Greenhill; B. J. Hazelton; D. Jacobs; D. L. Kaplan; J. C. Kasper; E. Kratzenberg; N. Kudryavtseva; E. Lenc; C. J. Lonsdale; M. J. Lynch; S. R. McWhirter; B. McKinley; D. A. Mitchell; M. F. Morales; E. Morgan; D. Oberoi; S. M. Ord; B. Pindor; T. Prabu; P. Procopio; A. R. Offringa; J. Riding; A. E. E. Rogers; A. Roshi; N. Udaya Shankar; K. S. Srivani; R. Subrahmanyan; S. J. Tingay; M. Waterson; R. B. Wayth; R. L. Webster; A. R. Whitney; A. Williams; C. L. Williams

doi:10.1093/mnras/stu1669

The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667

L. Hindson, M. Johnston-Hollitt, N. Hurley-Walker, K. Buckley, J. Morgan, E. Carretti, K. S. Dwarakanath, M. Bell, G. Bernardi, N. D. R. Bhat, J. D. Bowman, F. Briggs, R. J. Cappallo, B. E. Corey, A. A. Deshpande, D. Emrich, A. Ewall-Wice, L. Feng, B. M. Gaensler, R. GoekeL. J. Greenhill, B. J. Hazelton, D. Jacobs, D. L. Kaplan, J. C. Kasper, E. Kratzenberg, N. Kudryavtseva, E. Lenc, C. J. Lonsdale, M. J. Lynch, S. R. McWhirter, B. McKinley, D. A. Mitchell, M. F. Morales, E. Morgan, D. Oberoi, S. M. Ord, B. Pindor, T. Prabu, P. Procopio, A. R. Offringa, J. Riding, A. E. E. Rogers, A. Roshi, N. Udaya Shankar, K. S. Srivani, R. Subrahmanyan, S. J. Tingay, M. Waterson, R. B. Wayth, R. L. Webster, A. R. Whitney, A. Williams, C. L. Williams

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Abstract

We present the first Murchison Widefield Array observations of the well-known cluster of galaxies Abell 3667 (A3667) between 105 and 241 MHz. A3667 is one of the best known examples of a galaxy cluster hosting a double radio relic and has been reported to contain a faint radio halo and bridge. The origins of radio halos, relics and bridges is still unclear, however galaxy cluster mergers seems to be an important factor. We clearly detect the North-West (NW) and South-East (SE) radio relics in A3667 and find an integrated flux density at 149 MHz of 28.1 +/- 1.7 and 2.4 +/- 0.1 Jy, respectively, with an average spectral index, between 120 and 1400 MHz, of -0.9 +/- 0.1 for both relics. We find evidence of a spatial variation in the spectral index across the NW relic steepening towards the centre of the cluster, which indicates an ageing electron population. These properties are consistent with higher frequency observations. We detect emission that could be associated with a radio halo and bridge. How- ever, due to the presence of poorly sampled large-scale Galactic emission and blended point sources we are unable to verify the exact nature of these features.

Original language	English
Pages (from-to)	330-346
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	445
Issue number	1
Early online date	25 Sep 2014
DOIs	https://doi.org/10.1093/mnras/stu1669
Publication status	Published - 21 Nov 2014

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astro-ph.GA

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10.1093/mnras/stu1669

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Hindson, L., Johnston-Hollitt, M., Hurley-Walker, N., Buckley, K., Morgan, J., Carretti, E., Dwarakanath, K. S., Bell, M., Bernardi, G., Bhat, N. D. R., Bowman, J. D., Briggs, F., Cappallo, R. J., Corey, B. E., Deshpande, A. A., Emrich, D., Ewall-Wice, A., Feng, L., Gaensler, B. M., ... Williams, C. L. (2014). The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667. Monthly Notices of the Royal Astronomical Society, 445(1), 330-346. https://doi.org/10.1093/mnras/stu1669

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title = "The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667",

abstract = "We present the first Murchison Widefield Array observations of the well-known cluster of galaxies Abell 3667 (A3667) between 105 and 241 MHz. A3667 is one of the best known examples of a galaxy cluster hosting a double radio relic and has been reported to contain a faint radio halo and bridge. The origins of radio halos, relics and bridges is still unclear, however galaxy cluster mergers seems to be an important factor. We clearly detect the North-West (NW) and South-East (SE) radio relics in A3667 and find an integrated flux density at 149 MHz of 28.1 +/- 1.7 and 2.4 +/- 0.1 Jy, respectively, with an average spectral index, between 120 and 1400 MHz, of -0.9 +/- 0.1 for both relics. We find evidence of a spatial variation in the spectral index across the NW relic steepening towards the centre of the cluster, which indicates an ageing electron population. These properties are consistent with higher frequency observations. We detect emission that could be associated with a radio halo and bridge. How- ever, due to the presence of poorly sampled large-scale Galactic emission and blended point sources we are unable to verify the exact nature of these features.",

keywords = "astro-ph.GA",

author = "L. Hindson and M. Johnston-Hollitt and N. Hurley-Walker and K. Buckley and J. Morgan and E. Carretti and Dwarakanath, {K. S.} and M. Bell and G. Bernardi and Bhat, {N. D. R.} and Bowman, {J. D.} and F. Briggs and Cappallo, {R. J.} and Corey, {B. E.} and Deshpande, {A. A.} and D. Emrich and A. Ewall-Wice and L. Feng and Gaensler, {B. M.} and R. Goeke and Greenhill, {L. J.} and Hazelton, {B. J.} and D. Jacobs and Kaplan, {D. L.} and Kasper, {J. C.} and E. Kratzenberg and N. Kudryavtseva and E. Lenc and Lonsdale, {C. J.} and Lynch, {M. J.} and McWhirter, {S. R.} and B. McKinley and Mitchell, {D. A.} and Morales, {M. F.} and E. Morgan and D. Oberoi and Ord, {S. M.} and B. Pindor and T. Prabu and P. Procopio and Offringa, {A. R.} and J. Riding and Rogers, {A. E. E.} and A. Roshi and Shankar, {N. Udaya} and Srivani, {K. S.} and R. Subrahmanyan and Tingay, {S. J.} and M. Waterson and Wayth, {R. B.} and Webster, {R. L.} and Whitney, {A. R.} and A. Williams and Williams, {C. L.}",

note = "This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. {\textcopyright} 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2014",

month = nov,

day = "21",

doi = "10.1093/mnras/stu1669",

language = "English",

volume = "445",

pages = "330--346",

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

issn = "0035-8711",

publisher = "Oxford University Press",

number = "1",

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Hindson, L, Johnston-Hollitt, M, Hurley-Walker, N, Buckley, K, Morgan, J, Carretti, E, Dwarakanath, KS, Bell, M, Bernardi, G, Bhat, NDR, Bowman, JD, Briggs, F, Cappallo, RJ, Corey, BE, Deshpande, AA, Emrich, D, Ewall-Wice, A, Feng, L, Gaensler, BM, Goeke, R, Greenhill, LJ, Hazelton, BJ, Jacobs, D, Kaplan, DL, Kasper, JC, Kratzenberg, E, Kudryavtseva, N, Lenc, E, Lonsdale, CJ, Lynch, MJ, McWhirter, SR, McKinley, B, Mitchell, DA, Morales, MF, Morgan, E, Oberoi, D, Ord, SM, Pindor, B, Prabu, T, Procopio, P, Offringa, AR, Riding, J, Rogers, AEE, Roshi, A, Shankar, NU, Srivani, KS, Subrahmanyan, R, Tingay, SJ, Waterson, M, Wayth, RB, Webster, RL, Whitney, AR, Williams, A & Williams, CL 2014, 'The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667', Monthly Notices of the Royal Astronomical Society, vol. 445, no. 1, pp. 330-346. https://doi.org/10.1093/mnras/stu1669

TY - JOUR

T1 - The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission

T2 - the case of Abell 3667

AU - Hindson, L.

AU - Johnston-Hollitt, M.

AU - Hurley-Walker, N.

AU - Buckley, K.

AU - Morgan, J.

AU - Carretti, E.

AU - Dwarakanath, K. S.

AU - Bell, M.

AU - Bernardi, G.

AU - Bhat, N. D. R.

AU - Bowman, J. D.

AU - Briggs, F.

AU - Cappallo, R. J.

AU - Corey, B. E.

AU - Deshpande, A. A.

AU - Emrich, D.

AU - Ewall-Wice, A.

AU - Feng, L.

AU - Gaensler, B. M.

AU - Goeke, R.

AU - Greenhill, L. J.

AU - Hazelton, B. J.

AU - Jacobs, D.

AU - Kaplan, D. L.

AU - Kasper, J. C.

AU - Kratzenberg, E.

AU - Kudryavtseva, N.

AU - Lenc, E.

AU - Lonsdale, C. J.

AU - Lynch, M. J.

AU - McWhirter, S. R.

AU - McKinley, B.

AU - Mitchell, D. A.

AU - Morales, M. F.

AU - Morgan, E.

AU - Oberoi, D.

AU - Ord, S. M.

AU - Pindor, B.

AU - Prabu, T.

AU - Procopio, P.

AU - Offringa, A. R.

AU - Riding, J.

AU - Rogers, A. E. E.

AU - Roshi, A.

AU - Shankar, N. Udaya

AU - Srivani, K. S.

AU - Subrahmanyan, R.

AU - Tingay, S. J.

AU - Waterson, M.

AU - Wayth, R. B.

AU - Webster, R. L.

AU - Whitney, A. R.

AU - Williams, A.

AU - Williams, C. L.

N1 - This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.

PY - 2014/11/21

Y1 - 2014/11/21

N2 - We present the first Murchison Widefield Array observations of the well-known cluster of galaxies Abell 3667 (A3667) between 105 and 241 MHz. A3667 is one of the best known examples of a galaxy cluster hosting a double radio relic and has been reported to contain a faint radio halo and bridge. The origins of radio halos, relics and bridges is still unclear, however galaxy cluster mergers seems to be an important factor. We clearly detect the North-West (NW) and South-East (SE) radio relics in A3667 and find an integrated flux density at 149 MHz of 28.1 +/- 1.7 and 2.4 +/- 0.1 Jy, respectively, with an average spectral index, between 120 and 1400 MHz, of -0.9 +/- 0.1 for both relics. We find evidence of a spatial variation in the spectral index across the NW relic steepening towards the centre of the cluster, which indicates an ageing electron population. These properties are consistent with higher frequency observations. We detect emission that could be associated with a radio halo and bridge. How- ever, due to the presence of poorly sampled large-scale Galactic emission and blended point sources we are unable to verify the exact nature of these features.

AB - We present the first Murchison Widefield Array observations of the well-known cluster of galaxies Abell 3667 (A3667) between 105 and 241 MHz. A3667 is one of the best known examples of a galaxy cluster hosting a double radio relic and has been reported to contain a faint radio halo and bridge. The origins of radio halos, relics and bridges is still unclear, however galaxy cluster mergers seems to be an important factor. We clearly detect the North-West (NW) and South-East (SE) radio relics in A3667 and find an integrated flux density at 149 MHz of 28.1 +/- 1.7 and 2.4 +/- 0.1 Jy, respectively, with an average spectral index, between 120 and 1400 MHz, of -0.9 +/- 0.1 for both relics. We find evidence of a spatial variation in the spectral index across the NW relic steepening towards the centre of the cluster, which indicates an ageing electron population. These properties are consistent with higher frequency observations. We detect emission that could be associated with a radio halo and bridge. How- ever, due to the presence of poorly sampled large-scale Galactic emission and blended point sources we are unable to verify the exact nature of these features.

KW - astro-ph.GA

U2 - 10.1093/mnras/stu1669

DO - 10.1093/mnras/stu1669

M3 - Article

VL - 445

SP - 330

EP - 346

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -

The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667

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