The giant lobes of centaurus a observed at 118MHz with the murchison widefield array

B. McKinley, F. Briggs, B. M. Gaensler, I. J. Feain, G. Bernardi, R. B. Wayth, M. Johnston-Hollitt, A. R. Offringa, W. Arcus, D. G. Barnes, Judd Bowman, J. D. Bunton, R. J. Cappallo, B. E. Corey, A. A. Deshpande, L. deSouza, D. Emrich, R. Goeke, L. J. Greenhill, B. J. Hazelton & 33 others D. Herne, J. N. Hewitt, D. L. Kaplan, J. C. Kasper, B. B. Kincaid, R. Koenig, E. Kratzenberg, C. J. Lonsdale, M. J. Lynch, S. R. McWhirter, D. A. Mitchell, M. F. Morales, E. Morgan, D. Oberoi, S. M. Ord, J. Pathikulangara, T. Prabu, R. A. Remillard, A. E E Rogers, D. A. Roshi, J. E. Salah, R. J. Sault, N. Udaya Shankar, K. S. Srivani, J. Stevens, R. Subrahmanyan, S. J. Tingay, M. Waterson, R. L. Webster, A. R. Whitney, A. Williams, C. L. Williams, J. S B Wyithe

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We present new wide-field observations of Centaurus A (Cen A) and the surrounding region at 118MHz with the Murchison Widefield Array (MWA) 32-tile prototype, with which we investigate the spectral-index distribution of Cen A's giant radio lobes.We compare our images to 1.4 GHz maps of Cen A and compute spectral indices using temperature-temperature plots and spectral tomography. We find that the morphologies at 118MHz and 1.4 GHz match very closely apart from an extra peak in the southern lobe at 118 MHz, which provides tentative evidence for the existence of a southern counterpart to the northern middle lobe of Cen A. Our spatially averaged spectral indices for both the northern and southern lobes are consistent with previous analyses, however we find significant spatial variation of the spectra across the extent of each lobe. Both the spectral-index distribution and the morphology at low radio frequencies support a scenario of multiple outbursts of activity from the central engine. Our results are consistent with inverse-Compton modelling of radio and gamma-ray data that support a value for the lobe age of between 10 and 80 Myr.

Original languageEnglish (US)
Pages (from-to)1286-1301
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume436
Issue number2
DOIs
StatePublished - Dec 2013

Fingerprint

lobes
radio
outburst
tomography
engine
spatial variation
temperature
tiles
engines
index
radio frequencies
plots
prototypes
gamma rays
modeling
low frequencies
distribution

Keywords

  • Active-galaxies
  • Galaxies
  • Individual
  • Interferometric-galaxies
  • NGC 5128-radio continuum
  • Techniques

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

McKinley, B., Briggs, F., Gaensler, B. M., Feain, I. J., Bernardi, G., Wayth, R. B., ... Wyithe, J. S. B. (2013). The giant lobes of centaurus a observed at 118MHz with the murchison widefield array. Monthly Notices of the Royal Astronomical Society, 436(2), 1286-1301. https://doi.org/10.1093/mnras/stt1662

The giant lobes of centaurus a observed at 118MHz with the murchison widefield array. / McKinley, B.; Briggs, F.; Gaensler, B. M.; Feain, I. J.; Bernardi, G.; Wayth, R. B.; Johnston-Hollitt, M.; Offringa, A. R.; Arcus, W.; Barnes, D. G.; Bowman, Judd; Bunton, J. D.; Cappallo, R. J.; Corey, B. E.; Deshpande, A. A.; deSouza, L.; Emrich, D.; Goeke, R.; Greenhill, L. J.; Hazelton, B. J.; Herne, D.; Hewitt, J. N.; Kaplan, D. L.; Kasper, J. C.; Kincaid, B. B.; Koenig, R.; Kratzenberg, E.; Lonsdale, C. J.; Lynch, M. J.; McWhirter, S. R.; Mitchell, D. A.; Morales, M. F.; Morgan, E.; Oberoi, D.; Ord, S. M.; Pathikulangara, J.; Prabu, T.; Remillard, R. A.; Rogers, A. E E; Roshi, D. A.; Salah, J. E.; Sault, R. J.; Udaya Shankar, N.; Srivani, K. S.; Stevens, J.; Subrahmanyan, R.; Tingay, S. J.; Waterson, M.; Webster, R. L.; Whitney, A. R.; Williams, A.; Williams, C. L.; Wyithe, J. S B.

In: Monthly Notices of the Royal Astronomical Society, Vol. 436, No. 2, 12.2013, p. 1286-1301.

Research output: Contribution to journalArticle

McKinley, B, Briggs, F, Gaensler, BM, Feain, IJ, Bernardi, G, Wayth, RB, Johnston-Hollitt, M, Offringa, AR, Arcus, W, Barnes, DG, Bowman, J, Bunton, JD, Cappallo, RJ, Corey, BE, Deshpande, AA, deSouza, L, Emrich, D, Goeke, R, Greenhill, LJ, Hazelton, BJ, Herne, D, Hewitt, JN, Kaplan, DL, Kasper, JC, Kincaid, BB, Koenig, R, Kratzenberg, E, Lonsdale, CJ, Lynch, MJ, McWhirter, SR, Mitchell, DA, Morales, MF, Morgan, E, Oberoi, D, Ord, SM, Pathikulangara, J, Prabu, T, Remillard, RA, Rogers, AEE, Roshi, DA, Salah, JE, Sault, RJ, Udaya Shankar, N, Srivani, KS, Stevens, J, Subrahmanyan, R, Tingay, SJ, Waterson, M, Webster, RL, Whitney, AR, Williams, A, Williams, CL & Wyithe, JSB 2013, 'The giant lobes of centaurus a observed at 118MHz with the murchison widefield array', Monthly Notices of the Royal Astronomical Society, vol. 436, no. 2, pp. 1286-1301. https://doi.org/10.1093/mnras/stt1662
McKinley, B. ; Briggs, F. ; Gaensler, B. M. ; Feain, I. J. ; Bernardi, G. ; Wayth, R. B. ; Johnston-Hollitt, M. ; Offringa, A. R. ; Arcus, W. ; Barnes, D. G. ; Bowman, Judd ; Bunton, J. D. ; Cappallo, R. J. ; Corey, B. E. ; Deshpande, A. A. ; deSouza, L. ; Emrich, D. ; Goeke, R. ; Greenhill, L. J. ; Hazelton, B. J. ; Herne, D. ; Hewitt, J. N. ; Kaplan, D. L. ; Kasper, J. C. ; Kincaid, B. B. ; Koenig, R. ; Kratzenberg, E. ; Lonsdale, C. J. ; Lynch, M. J. ; McWhirter, S. R. ; Mitchell, D. A. ; Morales, M. F. ; Morgan, E. ; Oberoi, D. ; Ord, S. M. ; Pathikulangara, J. ; Prabu, T. ; Remillard, R. A. ; Rogers, A. E E ; Roshi, D. A. ; Salah, J. E. ; Sault, R. J. ; Udaya Shankar, N. ; Srivani, K. S. ; Stevens, J. ; Subrahmanyan, R. ; Tingay, S. J. ; Waterson, M. ; Webster, R. L. ; Whitney, A. R. ; Williams, A. ; Williams, C. L. ; Wyithe, J. S B. / The giant lobes of centaurus a observed at 118MHz with the murchison widefield array. In: Monthly Notices of the Royal Astronomical Society. 2013 ; Vol. 436, No. 2. pp. 1286-1301.
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title = "The giant lobes of centaurus a observed at 118MHz with the murchison widefield array",
abstract = "We present new wide-field observations of Centaurus A (Cen A) and the surrounding region at 118MHz with the Murchison Widefield Array (MWA) 32-tile prototype, with which we investigate the spectral-index distribution of Cen A's giant radio lobes.We compare our images to 1.4 GHz maps of Cen A and compute spectral indices using temperature-temperature plots and spectral tomography. We find that the morphologies at 118MHz and 1.4 GHz match very closely apart from an extra peak in the southern lobe at 118 MHz, which provides tentative evidence for the existence of a southern counterpart to the northern middle lobe of Cen A. Our spatially averaged spectral indices for both the northern and southern lobes are consistent with previous analyses, however we find significant spatial variation of the spectra across the extent of each lobe. Both the spectral-index distribution and the morphology at low radio frequencies support a scenario of multiple outbursts of activity from the central engine. Our results are consistent with inverse-Compton modelling of radio and gamma-ray data that support a value for the lobe age of between 10 and 80 Myr.",
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TY - JOUR

T1 - The giant lobes of centaurus a observed at 118MHz with the murchison widefield array

AU - McKinley, B.

AU - Briggs, F.

AU - Gaensler, B. M.

AU - Feain, I. J.

AU - Bernardi, G.

AU - Wayth, R. B.

AU - Johnston-Hollitt, M.

AU - Offringa, A. R.

AU - Arcus, W.

AU - Barnes, D. G.

AU - Bowman, Judd

AU - Bunton, J. D.

AU - Cappallo, R. J.

AU - Corey, B. E.

AU - Deshpande, A. A.

AU - deSouza, L.

AU - Emrich, D.

AU - Goeke, R.

AU - Greenhill, L. J.

AU - Hazelton, B. J.

AU - Herne, D.

AU - Hewitt, J. N.

AU - Kaplan, D. L.

AU - Kasper, J. C.

AU - Kincaid, B. B.

AU - Koenig, R.

AU - Kratzenberg, E.

AU - Lonsdale, C. J.

AU - Lynch, M. J.

AU - McWhirter, S. R.

AU - Mitchell, D. A.

AU - Morales, M. F.

AU - Morgan, E.

AU - Oberoi, D.

AU - Ord, S. M.

AU - Pathikulangara, J.

AU - Prabu, T.

AU - Remillard, R. A.

AU - Rogers, A. E E

AU - Roshi, D. A.

AU - Salah, J. E.

AU - Sault, R. J.

AU - Udaya Shankar, N.

AU - Srivani, K. S.

AU - Stevens, J.

AU - Subrahmanyan, R.

AU - Tingay, S. J.

AU - Waterson, M.

AU - Webster, R. L.

AU - Whitney, A. R.

AU - Williams, A.

AU - Williams, C. L.

AU - Wyithe, J. S B

PY - 2013/12

Y1 - 2013/12

N2 - We present new wide-field observations of Centaurus A (Cen A) and the surrounding region at 118MHz with the Murchison Widefield Array (MWA) 32-tile prototype, with which we investigate the spectral-index distribution of Cen A's giant radio lobes.We compare our images to 1.4 GHz maps of Cen A and compute spectral indices using temperature-temperature plots and spectral tomography. We find that the morphologies at 118MHz and 1.4 GHz match very closely apart from an extra peak in the southern lobe at 118 MHz, which provides tentative evidence for the existence of a southern counterpart to the northern middle lobe of Cen A. Our spatially averaged spectral indices for both the northern and southern lobes are consistent with previous analyses, however we find significant spatial variation of the spectra across the extent of each lobe. Both the spectral-index distribution and the morphology at low radio frequencies support a scenario of multiple outbursts of activity from the central engine. Our results are consistent with inverse-Compton modelling of radio and gamma-ray data that support a value for the lobe age of between 10 and 80 Myr.

AB - We present new wide-field observations of Centaurus A (Cen A) and the surrounding region at 118MHz with the Murchison Widefield Array (MWA) 32-tile prototype, with which we investigate the spectral-index distribution of Cen A's giant radio lobes.We compare our images to 1.4 GHz maps of Cen A and compute spectral indices using temperature-temperature plots and spectral tomography. We find that the morphologies at 118MHz and 1.4 GHz match very closely apart from an extra peak in the southern lobe at 118 MHz, which provides tentative evidence for the existence of a southern counterpart to the northern middle lobe of Cen A. Our spatially averaged spectral indices for both the northern and southern lobes are consistent with previous analyses, however we find significant spatial variation of the spectra across the extent of each lobe. Both the spectral-index distribution and the morphology at low radio frequencies support a scenario of multiple outbursts of activity from the central engine. Our results are consistent with inverse-Compton modelling of radio and gamma-ray data that support a value for the lobe age of between 10 and 80 Myr.

KW - Active-galaxies

KW - Galaxies

KW - Individual

KW - Interferometric-galaxies

KW - NGC 5128-radio continuum

KW - Techniques

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U2 - 10.1093/mnras/stt1662

DO - 10.1093/mnras/stt1662

M3 - Article

VL - 436

SP - 1286

EP - 1301

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 2

ER -