1999A&A...342...69A

Query : 1999A&A...342...69A

1999A&A...342...69A - Astronomy and Astrophysics, volume 342, 69-86 (1999/2-1)

The temporal characteristics of the TeV gamma-radiation from Mkn 501 in 1997. I. Data from the stereoscopic imaging atmospheric Cherenkov telescope system of HEGRA.

AHARONIAN F.A., AKHPERJANIAN A.G., BARRIO J.A., BERNLOEHR K., BOJAHR H., CONTRERAS J.L., CORTINA J., DAUM A., DECKERS T., FONSECA V., GONZALEZ J.C., HEINZELMANN G., HEMBERGER M., HERMANN G., HESS M., HEUSLER A., HOFMANN W., HOHL H., HORNS D., IBARRA A., KANKANYAN R., KIRSTEIN O., KOEHLER C., KONOPELKO A., KORNMAYER H., KRANICH D., KRAWCZYNSKI H., LAMPEITL H., LINDNER A., LORENZ E., MAGNUSSEN N., MEYER H., MIRZOYAN R., MORALEJO A., PADILLA L., PANTER M., PETRY D., PLAGA R., PLYASHESHNIKOV A., PRAHL J., PUEHLHOFER G., RAUTERBERG G., RENAULT C., RHODE W., SAHAKIAN V., SAMORSKI M., SCHMELE D., SCHROEDER F., STAMM W., VOELK H.J., WIEBEL-SOOTH B., WIEDNER C., WILLMER M. and WIRTH H.

Abstract (from CDS):

During 1997, the BL Lac Object Mkn 501 was the brightest known object in the TeV γ-ray sky. The emission was characterized by dramatic variations in intensity with a mean flux exceeding by a factor of three the steady γ-ray flux of the Crab Nebula. The stereoscopic HEGRA system of 4 Imaging Atmospheric Cherenkov Telescopes, with an energy threshold of about 500GeV, an angular resolution of 0.1°, an energy resolution of 20%, and a flux sensitivity νF_ν at 1 TeV of 10^–11ergs/cm²/sec ≃1/4Crab for 1 hour of observation time (S/sqrt(B)=5σ), has been used in 1997 for a comprehensive study of the spectral and temporal characteristics of the TeV γ-ray emission from Mkn 501 on time scales of several hours or less. In this paper (Part I) the γ-ray fluxes and spectra on a diurnal basis during the period March to October 1997 are presented. Furthermore, the correlation of the TeV emission with the flux measured by the RXTE All Sky Monitor in the energy range from 2 to 12keV are studied. Finally the implications of these results on the physics of relativistic jets in BL Lac objects are briefly discussed. The companion paper (Part II) describes the results from the stand alone telescopes CT1 and CT2.

Abstract Copyright: ∼

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

Simbad objects: 3

View the references in ADS

Number of rows : 3

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2023	#notes
1	Mrk 421	BLL	11 04 27.3140835504	+38 12 31.798495872		13.50	12.90	8.31	~	2585	1
2	4C 39.49	BLL	16 53 52.21668403	+39 45 36.6088754	14.09	14.15	13.29	8.26	~	2085	2
3	QSO B2344+514	BLL	23 47 04.8372110928	+51 42 17.877513168			15.50	10.7	~	431	0

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