1997A&A...327L...5A

Query : 1997A&A...327L...5A

1997A&A...327L...5A - Astronomy and Astrophysics, volume 327L5-8 (1997/11-2)

Measurement of the flux, spectrum, and variability of TeV γ-rays from Mkn 501 during a state of high activity.

AHARONIAN F., AKHPERJANIAN A.G., BARRIO J.A., BERNLOEHR K., BETETA J.J.G., BRADBURY S.M., CONTRERAS J.L., CORTINA J., DAUM A., DECKERS T., FEIGL E., FERNANDEZ J., FONSECA V., FRASS A., FUNK B., GONZALEZ J.C., HAUSTEIN V., HEINZELMANN G., HEMBERGER M., HERMANN G., HESS M., HEUSLER A., HOFMANN W., HOLL I., HORNS D., 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., MOELLER H., MORALEJO A., PADILLA L., PANTER M., PETRY D., PLAGA R., PRAHL J., PROSCH C., PUEHLHOFER G., RAUTERBERG G., RHODE W., RIVERO R., ROEHRING A., SAHAKIAN V., SAMORSKI M., SANCHEZ J.A., SCHMELE D., SCHMIDT T., STAMM W., ULRICH M., VOELK H.J., WESTERHOFF S., WIEBEL-SOOTH B., WIEDNER C.A., WILLMER M. and WIRTH H.

Abstract (from CDS):

Between March 16, 1997 and April 14, 1997, a high flux level of TeV γ-rays was observed from Mkn 501, using the HEGRA stereoscopic system of four imaging Cherenkov telescopes. The flux level varied during this period from about one half up to six times the flux observed from the Crab Nebula. Changes of the detection rate by a factor of up to 4 within 1 day have been observed. The measured differential energy spectrum of the radiation follows a power law from 1 TeV to 10 TeV. The differential spectral index of 2.47±0.07±0.25 is close to that of the Crab Nebula of 2.66±0.12±0.25.

Abstract Copyright: ∼

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

CDS comments: The HEGRA Collaboration

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 - 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 Z 184-50 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2841 1
4 Z 225-7 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2304 2

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