2001A&A...366..746A

Query : 2001A&A...366..746A

2001A&A...366..746A - Astronomy and Astrophysics, volume 366, 746-751 (2001/2-2)

Search for a TeV gamma-ray halo of Mkn 501.

AHARONIAN F.A., AKHPERJANIAN A.G., BARRIO J.A., BERNLOEHR K., BOLZ O., BOERST H., BOJAHR H., CONTRERAS J.L., CORTINA J., DENNINGHOFF S., FONSECA V., GONZALEZ J.C., 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., LORENZ E., LUCARELLI F., MAGNUSSEN N., MANG O., MEYER H., MIRZOYAN R., MORALEJO A., PADILLA L., PANTER M., PLAGA R., PLYASHESHNIKOV A., PRAHL J., PUEHLHOFER G., RHODE W., ROEHRING A., ROWELL G.P., SAHAKIAN V., SAMORSKI M., SCHILLING M., SCHROEDER F., SIEMS M., STAMM W., TLUCZYKONT M., VOELK H.J., WIEDNER C. and WITTEK W.

Abstract (from CDS):

For distant extragalactic sources of gamma-rays in the PeV (10¹⁵eV) energy range, interactions of the gamma rays with intergalactic diffuse radiation fields will initiate a pair cascade. Depending on the magnetic fields in the vicinity of the source, the cascade can either result in an isotropic halo around an initially beamed source, or remain more or less collimated. Data recorded by the HEGRA system of imaging atmospheric Cherenkov telescopes are used to derive limits on the halo flux from the AGN Mrk 501. This is achieved by comparing the angular distribution of TeV gamma-rays during the 1997 burst phase - where direct photons should dominate - with the distribution during the 1998/99 quiescent state, where a steady-state halo contribution should be most pronounced. The results depend on the assumptions concerning the angular distribution of the halo; limits on the halo flux within 0.5° to 1° from the source range between 0.1% and 1% of the peak burst flux.

Abstract Copyright: ∼

Journal keyword(s): galaxies: BL Lacertae objects: individual: Mkn 501 - gamma rays: observations

Simbad objects: 4

Full paper

View the references in ADS

Number of rows : 4

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2024	#notes
1	M 1	SNR	05 34 30.9	+22 00 53					~	6123	1
2	V* CM Tau	Psr	05 34 31.9474694616	+22 00 52.153698024					~	5201	0
3	Mrk 421	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31	~	2628	1
4	7C 165211.80+395026.00	BLL	16 53 52.21668403	+39 45 36.6088754	14.09	14.15	13.29	8.26	~	2123	2

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