2015MNRAS.446.3478M

Query : 2015MNRAS.446.3478M

2015MNRAS.446.3478M - Mon. Not. R. Astron. Soc., 446, 3478-3491 (2015/February-1)

Modelling of the spectral energy distribution of Fornax A: leptonic and hadronic production of high-energy emission from the radio lobes.

McKINLEY B., YANG R., LOPEZ-CANIEGO M., BRIGGS F., HURLEY-WALKER N., WAYTH R.B., OFFRINGA A.R., CROCKER R., BERNARDI G., PROCOPIO P., GAENSLER B.M., TINGAY S.J., JOHNSTON-HOLLITT M., McDONALD M., BELL M., BHAT N.D.R., BOWMAN J.D., CAPPALLO R.J., COREY B.E., DESHPANDE A.A., EMRICH D., EWALL-WICE A., FENG L., GOEKE R., GREENHILL L.J., HAZELTON B.J., HEWITT J.N., HINDSON L., JACOBS D., KAPLAN D.L., KASPER J.C., KRATZENBERG E., KUDRYAVTSEVA N., LENC E., LONSDALE C.J., LYNCH M.J., McWHIRTER S.R., MITCHELL D.A., MORALES M.F., MORGAN E., OBEROI D., ORD S.M., PINDOR B., PRABU T., RIDING J., ROGERS A.E.E., ROSHI D.A., UDAYA SHANKAR N., SRIVANI K.S., SUBRAHMANYAN R., WATERSON M., WEBSTER R.L., WHITNEY A.R., WILLIAMS A. and WILLIAMS C.L.

Abstract (from CDS):

We present new low-frequency observations of the nearby radio galaxy Fornax A at 154MHz with the Murchison Widefield Array, microwave flux-density measurements obtained from WMAP and Planck data, and γ-ray flux densities obtained from Fermi data. We also compile a comprehensive list of previously published images and flux-density measurements at radio, microwave and X-ray energies. A detailed analysis of the spectrum of Fornax A between 154 and 1510MHz reveals that both radio lobes have a similar spatially averaged spectral index, and that there exists a steep-spectrum bridge of diffuse emission between the lobes. Taking the spectral index of both lobes to be the same, we model the spectral energy distribution of Fornax A across an energy range spanning 18 orders of magnitude, to investigate the origin of the X-ray and γ-ray emission. A standard leptonic model for the production of both the X-rays and γ-rays by inverse-Compton scattering does not fit the multiwavelength observations. Our results best support a scenario where the X-rays are produced by inverse-Compton scattering and the γ-rays are produced primarily by hadronic processes confined to the filamentary structures of the Fornax A lobes.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: active - galaxies: individual: NGC1316 - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/MNRAS/446/3478): list.dat fits/*>

Simbad objects: 7

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Number of rows : 7
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
3 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
4 ESO 252-18A Sy1 05 19 49.7229323856 -45 46 43.852662732   15.73 15.77 14.85   ~ 714 0
5 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
6 NAME Fermi Bubbles bub 17 45 -29.0           ~ 525 0
7 MCG+07-41-003 Bla 19 59 28.35656837 +40 44 02.0972325   16.22 15.10     ~ 2537 2

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