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Markarian 421: Te V Gamma-ray Flares and VLBI Structure

Published online by Cambridge University Press:  12 April 2016

P.G. Edwards ,
G.A. Moellenbrock ,
S.C. Unwin ,
A.E. Wehrle  and
T.C. Weekes
P.G. Edwards
Affiliation:
ISAS, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229, Japan
G.A. Moellenbrock
Affiliation:
ISAS, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229, Japan
S.C. Unwin
Affiliation:
Jet Propulsion Laboratory, MS 301-370, Pasadena, CA 91109-8099, USA
A.E. Wehrle
Affiliation:
IPAC/JPL/Caltech, Pasadena, USA
T.C. Weekes
Affiliation:
Harvard-Smithsonian CfA, Amado, AZ 85645-0097, USA

Abstract

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Photons spanning over 17 decades in energy have been detected from Markarian 421. The discovery of >100 MeV photons by the EGRET instrument on board the Compton Gamma Ray Observatory led to the discovery of >300 GeV photons by the Whipple group using the air Čerenkov method. In May 1996 the source underwent an unprecedented outburst at these energies, inspiring observations with the VLBA to determine whether such high energy flares are associated with changes in the milliarcsecond structure of this BL Lac object.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 45 - 46
Copyright
Copyright © Astronomical Society of the Pacific 1998

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