2001A&A...370..112A

Query : 2001A&A...370..112A

2001A&A...370..112A - Astronomy and Astrophysics, volume 370112-120 (2001/4-4)

Evidence for TeV gamma ray emission from Cassiopeia A.

AHARONIAN F., AKHPERJANIAN A., BARRIO J., BERNLOEHR K., BOERST H., BOJAHR H., BOLZ O., CONTRERAS J., CORTINA J., DENNINGHOFF S., FONSECA V., GONZALEZ J., GOETTING N., HEINZELMANN G., HERMANN G., HEUSLER A., HOFMANN W., HORNS D., IBARRA A., ISERLOHE C., JUNG I., KANKANYAN R., KESTEL M., KETTLER J., KOHNLE A., KONOPELKO A., KORNMEYER H., KRANICH D., KRAWCZYNSKI H., LAMPEITL H., LOPEZ M., LORENZ E., LUCARELLI F., MAGNUSSEN N., MANG O., MEYER H., MIRZOYAN R., MORALEJO A., ONA E., PADILLA L., PANTER M., PLAGA R., PLYASHESHNIKOV A., PRAHL J., PUEHLHOFER G., RAUTERBERG G., ROEHRING A., RHODE W., ROWELL G.P., SAHAKIAN V., SAMORSKI M., SCHILLING M., SCHROEDER F., SIEMS M., STAMM W., TLUCZYKONT M., VOELK H.J., WIEDNER C.A. and WITTEK W.

Abstract (from CDS):

232 hours of data were accumulated from 1997 to 1999, using the HEGRA Stereoscopic Cherenkov Telescope System to observe the supernova remnant Cassiopeia A. TeV γ-ray emission was detected at the 5σ level, and a flux of (5.8±1.2stat±1.2syst) 10–9ph/m2/s above 1TeV was derived. The spectral distribution is consistent with a power law with a differential spectral index of -2.5±0.4stat±0.1syst between 1 and 10TeV. As this is the first report of the detection of a TeV γ-ray source on the ``centi-Crab'' scale, we present the analysis in some detail. Implications for the acceleration of cosmic rays depend on the details of the source modeling. We discuss some important aspects in this paper.

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Journal keyword(s): ISM: supernova remnants - ISM: individual objects: Cassiopeia A - cosmic rays - gamma rays: observations

Simbad objects: 6

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Number of rows : 6
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 1 SNR 05 34 31.8 +22 01 03           ~ 6516 1
2 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5476 0
3 NAME Lupus SN SNR 15 02 22.1 -42 05 49           ~ 1407 1
4 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2
5 SNR G347.3-00.5 SNR 17 12 27 -39 41.2     12.27     ~ 761 1
6 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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