Detection of TeV gamma rays from the AGN Markarian 421. [M1; NGC 1952; Mrk 421]

Conference · Tue Jun 15 04:00:00 EDT 1993 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:6275601

Schubnell, M; Akerlof, C W ^[1]; Cawley, M F ^[2]; Chantell, M ^[3]; Fegan, D J ^[4]; Fennell, S ^[3]; O'Flaherty, K S ^[4]; Gaidos, J A ^[5]; Hagan, J ^[4]; Hillas, A M ^[6]; Jiang, Y ^[3]; Kerrick, A D; Lamb, R C ^[7]; Lawrence, M A ^[8]

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1. University of Michigan, Ann Arbor, Michigan 48109 (United States)
2. St. Patrick's College, Maynooth, Co., Kildare (Ireland)
3. Whipple Observatory, Harvard-Smithsonian CfA, Amado, Arizona 85645 (United States)
4. University College Dublin, Belfield, Dublin 4 (Ireland)
5. Purdue University, West Lafayette, Indiana 47907 (United States)
6. University of Leeds, Leeds LS2 9JT (United Kingdom)
7. Iowa State University, Ames, Iowa 50011 (United States)
8. Whipple Observatory, Harvard-Smithsonian CfA, Amado, Arizona

We present here the detection of TeV gamma rays from the extragalactic source Markarian 421. Observations obtained with the Whipple 10 m imaging Cherenkov telescope in March--June 1992 give a gamma ray signal with statistical significance of 6.3[sigma] above background. The excess corresponds to an average flux of 1.5[times]10[sup [minus]11] cm[sup [minus]2] s[sup [minus]1] above 0.5 TeV, equivalent to 0.3 of that from the Crab Nebula. The estimated location of the source agrees with the position of Mrk 421 to the angular uncertainty of the Whipple instrument (6 arc minutes).

• OSTI ID: 6275601
• Report Number(s): CONF-9206284--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 276:1
• Country of Publication: United States
• Language: English

Related Subjects

663620* -- Physics of Radiations Other Than Neutrons-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BOSONS
CHERENKOV COUNTERS
COSMIC PHOTONS
COSMIC RADIATION
COSMIC RAY FLUX
DATA
DETECTION
ELEMENTARY PARTICLES
ENERGY RANGE
ENERGY SPECTRA
EXPERIMENTAL DATA
GEV RANGE
GEV RANGE 100-1000
INFORMATION
IONIZING RADIATIONS
MASSLESS PARTICLES
MEASURING INSTRUMENTS
NUMERICAL DATA
PHOTONS
RADIATION DETECTORS
RADIATION FLUX
RADIATIONS
SHOWERS
SPECTRA
TELESCOPES
TEV RANGE
TEV RANGE 01-10