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Multiwavelength Observations of Markarian 421 During a TeV/X-Ray FlareA TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory air Cherenkov experiment during which the flux above 250 GeV increased by nearly an order of magnitude over a 2-day period. Contemporaneous observations by ASCA showed the X-ray flux to be in a very high state. We present these results, combined with the first ever simultaneous or nearly simultaneous observations at GeV gamma-ray, UV, IR, mm, and radio energies for this nearest BL Lac object. While the GeV gamma-ray flux increased slightly, there is little evidence for variability comparable to that seen at TeV and X-ray energies. Other wavelengths show even less variability. This provides important constraints on the emission mechanisms at work. We present the multiwavelength spectrum of this gamma-ray blazar for both quiescent and flaring states and discuss the data in terms of current models of blazar emission.
Document ID
19960020403
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Bertsch, D. L.(NASA Goddard Space Flight Center Greenbelt, MD United States)
Bruhweiler, F.(NASA Goddard Space Flight Center Greenbelt, MD United States)
Macomb, D. J.(NASA Goddard Space Flight Center Greenbelt, MD United States)
Cheng, K.-P.(NASA Goddard Space Flight Center Greenbelt, MD United States)
Carter-Lewis, D. A.(Iowa State Univ. Ames, IA United States)
Akerlof, C. W.(Michigan Univ. Ann Arbor, MI United States)
Aller, H. D.(Michigan Univ. Ann Arbor, MI United States)
Aller, M. F.(Michigan Univ. Ann Arbor, MI United States)
Buckley, J. H.(Harvard-Smithsonian Center for Astrophysics Amado, AZ United States)
Cawley, M. F.(Saint Patrick's Coll. Maynooth, Ireland)
Date Acquired
September 6, 2013
Publication Date
August 20, 1995
Subject Category
Space Radiation
Report/Patent Number
NASA-CR-200811
NAS 1.26:200811
Report Number: NASA-CR-200811
Report Number: NAS 1.26:200811
Accession Number
96N23980
Funding Number(s)
CONTRACT_GRANT: NAG5-2508
Distribution Limits
Public
Copyright
Public Use Permitted.

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