2010ApJ...719.1433A

Query : 2010ApJ...719.1433A

2010ApJ...719.1433A - Astrophys. J., 719, 1433-1444 (2010/August-3)

Fermi large area telescope view of the core of the radio galaxy Centaurus A.

ABDO A.A., ACKERMANN M., AJELLO M., ATWOOD W.B., BALDINI L., BALLET J., BARBIELLINI G., BASTIERI D., BAUGHMAN B.M., BECHTOL K., BELLAZZINI R., BERENJI B., BLANDFORD R.D., BLOOM E.D., BONAMENTE E., BORGLAND A.W., BOUVIER A., BRANDT T.J., BREGEON J., BREZ A., BRIGIDA M., BRUEL P., BUEHLER R., BUSON S., CALIANDRO G.A., CAMERON R.A., CANNON A., CARAVEO P.A., CARRIGAN S., CASANDJIAN J.M., CAVAZZUTI E., CECCHI C., CELIK O., CHARLES E., CHEKHTMAN A., CHEUNG C.C., CHIANG J., CIPRINI S., CLAUS R., COHEN-TANUGI J., COLAFRANCESCO S., COMINSKY L.R., CONRAD J., COSTAMANTE L., DAVIS D.S., DERMER C.D., DE ANGELIS A., DE PALMA F., DO COUTO E SILVA E., DRELL P.S., DUBOIS R., DUMORA D., FALCONE A., FARNIER C., FAVUZZI C., FEGAN S.J., FINKE J., FOCKE W.B., FORTIN P., FRAILIS M., FUKAZAWA Y., FUNK S., FUSCO P., GARGANO F., GASPARRINI D., GEHRELS N., GEORGANOPOULOS M., GERMANI S., GIEBELS B., GIGLIETTO N., GIOMMI P., GIORDANO F., GIROLETTI M., GLANZMAN T., GODFREY G., GRANDI P., GRENIER I.A., GRONDIN M.-H., GROVE J.E., GUILLEMOT L., GUIRIEC S., HADASCH D., HARDING A.K., HASE H., HAYASHIDA M., HAYS E., HORAN D., HUGHES R.E., ITOH R., JACKSON M.S., JOHANNESSON G., JOHNSON A.S., JOHNSON T.J., JOHNSON W.N., KADLER M., KAMAE T., KATAGIRI H., KATAOKA J., KAWAI N., KISHISHITA T., KNOEDLSEDER J., KUSS M., LANDE J., LATRONICO L., LEE S.-H., LEMOINE-GOUMARD M., GARDE M.L., LONGO F., LOPARCO F., LOTT B., LOVELLETTE M.N., LUBRANO P., MAKEEV A., MAZZIOTTA M.N., McCONVILLE W., McENERY J.E., MICHELSON P.F., MITTHUMSIRI W., MIZUNO T., MOISEEV A.A., MONTE C., MONZANI M.E., MORSELLI A., MOSKALENKO I.V., MURGIA S., MUELLER C., NAKAMORI T., NAUMANN-GODO M., NOLAN P.L., NORRIS J.P., NUSS E., OHNO M., OHSUGI T., OJHA R., OKUMURA A., OMODEI N., ORLANDO E., ORMES J.F., OZAKI M., PAGANI C., PANEQUE D., PANETTA J.H., PARENT D., PELASSA V., PEPE M., PESCE-ROLLINS M., PIRON F., PLOTZ C., PORTER T.A., RAINO S., RANDO R., RAZZANO M., RAZZAQUE S., REIMER A., REIMER O., REPOSEUR T., RIPKEN J., RITZ S., RODRIGUEZ A.Y., ROTH M., RYDE F., SADROZINSKI H.F.-W., SANCHEZ D., SANDER A., SCARGLE J.D., SGRO C., SISKIND E.J., SMITH P.D., SPANDRE G., SPINELLI P., STARCK J.-L., STAWARZ L., STRICKMAN M.S., SUSON D.J., TAJIMA H., TAKAHASHI H., TAKAHASHI T., TANAKA T., THAYER J.B., THAYER J.G., THOMPSON D.J., TIBALDO L., TORRES D.F., TOSTI G., TRAMACERE A., UCHIYAMA Y., USHER T.L., VANDENBROUCKE J., VASILEIOU V., VILCHEZ N., VITALE V., WAITE A.P., WANG P., WINER B.L., WOOD K.S., YANG Z., YLINEN T. and ZIEGLER M.

Abstract (from CDS):

We present γ-ray observations with the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope of the nearby radio galaxy Centaurus A (Cen A). The previous EGRET detection is confirmed, and the localization is improved using data from the first 10 months of Fermi science operation. In previous work, we presented the detection of the lobes by the LAT; in this work, we concentrate on the γ-ray core of Cen A. Flux levels as seen by the LAT are not significantly different from that found by EGRET, nor is the extremely soft LAT spectrum (Γ = 2.67±0.10stat± 0.08sys where the photon flux is Φ {vprop} E –Γ). The LAT core spectrum, extrapolated to higher energies, is marginally consistent with the non-simultaneous HESS spectrum of the source. The LAT observations are complemented by simultaneous observations from Suzaku, the Swift Burst Alert Telescope and X-ray Telescope, and radio observations with the Tracking Active Galactic Nuclei with Austral Milliarcsecond Interferometry program, along with a variety of non-simultaneous archival data from a variety of instruments and wavelengths to produce a spectral energy distribution (SED). We fit this broadband data set with a single-zone synchrotron/synchrotron self-Compton model, which describes the radio through GeV emission well, but fails to account for the non-simultaneous higher energy TeV emission observed by HESS from 2004 to 2008. The fit requires a low Doppler factor, in contrast to BL Lac objects which generally require larger values to fit their broadband SEDs. This indicates that the γ-ray emission originates from a slower region than that from BL Lac objects, consistent with previous modeling results from Cen A. This slower region could be a slower moving layer around a fast spine, or a slower region farther out from the black hole in a decelerating flow. The fit parameters are also consistent with Cen A being able to accelerate ultra-high energy cosmic-rays, as hinted at by results from the Auger observatory.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: individual: Centaurus A - galaxies: jets - gamma rays: galaxies - radiation mechanisms: non-thermal

Simbad objects: 21

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Number of rows : 21
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 3C 66A BLL 02 22 39.6114771888 +43 02 07.799534304   15.71 15.21 14.5   ~ 942 2
2 Z 538-57 Sy1 02 23 11.41124925 +42 59 31.3853324   15.71 14.81     ~ 582 2
3 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
4 NGC 1316 rG 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1491 1
5 3C 111 Sy1 04 18 21.2772425736 +38 01 35.801359968   19.75 18.05     ~ 1002 2
6 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
7 NVSS J125949-374856 BLL 12 59 49.8016507752 -37 48 58.164672276         17.031 ~ 44 1
8 AT20G J130340-462103 Bla 13 03 40.2821404108 -46 21 02.452578175           ~ 60 1
9 1RXS J130421.2-435308 BLL 13 04 21.0058097184 -43 53 10.199729472 16.09 15.84 15.71     ~ 72 1
10 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
11 MCG-07-27-032 Sy1 13 06 26.1214861728 -40 24 52.595604396   13.58 13.42 12.01   ~ 269 0
12 PMN J1307-4259 BLL 13 07 37.9837746648 -42 59 38.986887192 16.39 16.10 15.92 15.80 14.59 ~ 68 1
13 1FGL J1320.1-4007 gam 13 20 10.0 -40 07 36           ~ 9 0
14 NAME Cen A Core PoG 13 25 27.6039817176 -43 01 09.493008456           ~ 39 0
15 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
16 PMN J1328-4728 BLL 13 28 40.6236883896 -47 27 49.456920852           ~ 53 1
17 1FGL J1333.4-4036 gam 13 33 26 -40 36.2           ~ 7 0
18 1FGL J1334.2-4448 gam 13 34 15.0 -44 48 48           ~ 8 0
19 ICRF J134740.4-375036 Bla 13 47 40.42899075 -37 50 36.6201264       19.1   ~ 80 1
20 NGC 6251 Bla 16 32 31.96989253 +82 32 16.3999044 15.24 14.66 12.89 7.62   ~ 772 1
21 PKS J2158-3013 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1829 1

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