DETECTION OF GAMMA-RAYS WITH E-GREATER-THAN-300 GEV FROM MARKARIAN-501

Authors
QUINN J AKERLOF CW BILLER S BUCKLEY J CARTERLEWIS DA CAWLEY MF CATANESE M CONNAUGHTON V FEGAN DJ FINLEY JP GAIDOS J HILLAS AM LAMB RC KRENNRICH F LESSARD R MCENERY JE MEYER DI MOHANTY G RODGERS AJ ROSE HJ SCHUBNELL MS SEMBROSKI G WEEKES TC WILSON C ZWEERINK J
Citation
J. Quinn et al., DETECTION OF GAMMA-RAYS WITH E-GREATER-THAN-300 GEV FROM MARKARIAN-501, The Astrophysical journal, 456(2), 1996, pp. 83-86
Citations number
17
Categorie Soggetti
Astronomy & Astrophysics
Journal title
The Astrophysical journal → ACNP
ISSN journal
0004637X
Volume
456
Issue
2
Year of publication
1996
Part
2
Pages
83 - 86
Database
ISI
SICI code
0004-637X(1996)456:2<83:DOGWEG>2.0.ZU;2-#
Abstract
The detection of gamma rays of energy greater than 300 GeV from the BL Lacertae object Mrk 501 demonstrates that extragalactic TeV emission is not unique to Mrk 421. During 66 hr of observations between 1995 Ma rch and July we measured an average flux of 8.1 +/- 1.4 x 10(-12) cm(- 2) s(-1) above 300 GeV, a flux that is only 20% of the average Mrk 421 flux. The new gamma-ray source has not been reported by the Compton G amma Ray Observatory as an emitter of gamma rays at lower energies. Th ere is evidence for variability on timescales of days.