THE TEV GAMMA-RAY SPECTRUM OF MARKARIAN-421 DURING AN INTENSE FLARE

Authors
ZWEERINK JA AKERLOF CW BILLER SD BOYLE P BUCKLEY JH BURDETT A GORDO JB CARTERLEWIS DA CATANESE M CAWLEY MF FEGAN DJ FINLEY JP GAIDOS JA HILLAS AM KRENNRICH F LAMB RC LESSARD RW MCENERY JE MOHANTY G QUINN J RODGERS AJ ROSE HJ SAMUELSON FW SCHUBNELL MS SEMBROSKI G SRINIVASAN R WEEKES TC WILSON C
Citation
Ja. Zweerink et al., THE TEV GAMMA-RAY SPECTRUM OF MARKARIAN-421 DURING AN INTENSE FLARE, The Astrophysical journal, 490(2), 1997, pp. 141-144
Citations number
38
Journal title
The Astrophysical journal → ACNP
ISSN journal
0004637X
Volume
490
Issue
2
Year of publication
1997
Part
2
Pages
141 - 144
Database
ISI
SICI code
0004-637X(1997)490:2<141:TTGSOM>2.0.ZU;2-O
Abstract
We present the gamma-ray spectrum of the BL Lacertae object, Markarian 421, above 500 GeV during its most intense recorded TeV flare, on 199 6 May 7. The spectrum is well fitted by a power law with an exponent o f -2.56 +/- 0.07 +/- 0.1 (statistical and systematic errors). The spec trum extends above 5 TeV with no evidence for a cutoff, favoring deter minations of the extragalactic infrared energy density that do not pro duce a sharp cutoff at these energies.