2013MNRAS.436.1286M

Query : 2013MNRAS.436.1286M

2013MNRAS.436.1286M - Mon. Not. R. Astron. Soc., 436, 1286-1301 (2013/December-1)

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 J.D., 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. and WYITHE J.S.B.

Abstract (from CDS):

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 1.4GHz maps of Cen A and compute spectral indices using temperature-temperature plots and spectral tomography. We find that the morphologies at 118MHz and 1.4GHz match very closely apart from an extra peak in the southern lobe at 118MHz, 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 80Myr.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): techniques: interferometric - galaxies: active - galaxies: individual: NGC 5128 - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/436/1286): list.dat fits/*>

Simbad objects: 16

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Number of rows : 16
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 SNR G295.5+09.7 SNR 12 09 40 -52 25.0           ~ 301 1
2 PKS 1232-41 rG 12 35 41.91 -41 53 18.0     17.5     ~ 22 1
3 QSO B1243-412 QSO 12 45 57.6306392928 -41 28 45.188271804   18       ~ 21 1
4 NGC 4696 rG 12 48 49.2724775784 -41 18 39.304053252   11.21   10.7   ~ 510 3
5 PKS 1247-401 rG 12 50 05.71 -40 26 29.8   17.0       ~ 17 1
6 MRC 1318-434B Rad 13 21 17.0 -43 41 16           ~ 7 0
7 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
8 SUMSS J132937-444414 Rad 13 29 38.11981 -44 44 11.0894           ~ 5 1
9 PKS 1328-410 Rad 13 31 16.7 -41 20 06           ~ 1 0
10 PKS 1340-373 Rad 13 43 54.38 -37 33 54.9           ~ 7 1
11 PKS 1346-39 rG 13 49 51.09 -39 22 51.1           ~ 18 1
12 QSO B1355-4138 BLL 13 59 00.1848056808 -41 52 52.639227912   15.76 15.86 16.37   ~ 152 0
13 ESO 271-20 rG 14 10 28.9034795160 -42 46 55.513245144   14.94       ~ 30 1
14 VV 204 SyG 15 04 57.1195361592 +26 00 58.455780156   15.24       ~ 299 1
15 MCG+01-43-006 SyG 16 51 07.9886687784 +04 59 35.547131472     18.25     ~ 502 1
16 ACO 2372 ClG 21 45 04.8 -19 56 17           ~ 42 0

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