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


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.29CET07:07:46

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

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4838 1
2 M 1 SNR 05 34 31.94 +22 00 52.2           ~ 5671 4
3 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2410 1
4 4C 39.49 BLL 16 53 52.21668494 +39 45 36.6089458 14.09 14.15 13.29 8.26   ~ 1938 2

    Equat.    Gal    SGal    Ecl

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2020.11.29-07:07:46

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