Document Type
Article
Publication Date
1995
Abstract
A Te V 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 Ge V 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.
Recommended Citation
Macomb, D.J., Akerlof, C.W., Aller, H.D., Aller, M.F., Bertsch, D.L., Kafatos, M., et al. (1995) Multiwavelength Observations of Markarian 421 During a TeV/X-Ray Flare, Astrophysical Journal, 449:L99-L103. doi: 10.1086/309646
Peer Reviewed
1
Copyright
IOP Publishing
Included in
Other Astrophysics and Astronomy Commons, Stars, Interstellar Medium and the Galaxy Commons
Comments
This article was originally published in Astrophysical Journal, volume 449, in 1995. DOI: 10.1086/309646