Gamma-ray variability of the BL lacertae object Markarian 421

J. H. Buckley, C. W. Akerlof, S. Biller, D. A. Carter-Lewis, M. Catanese, M. F. Cawley, V. Connaughton, D. J. Fegan, J. P. Finley, J. Gaidos, A. M. Hillas, J. F. Kartje, A. Königl, F. Krennrich, R. C. Lamb, R. Lessard, D. J. Macomb, J. R. Mattox, J. E. McEnery, G. MohantyJ. Quinn, A. J. Rodgers, H. J. Rose, M. S. Schubnel, G. L. Sembroski, P. S. Smith, T. C. Weekes, C. Wilson, J. Zweerink

Research output: Contribution to journalArticlepeer-review

122 Scopus citations

Abstract

We report on the γ-ray variability of Mrk 421 at Eγ > 300 GeV during the 1995 season, and concentrate on the results of an intense multiwavelength observing campaign in the period April 20 to May 5, which included >100 MeV γ-ray, X-ray, extreme-ultraviolet, optical, and radio observations, some of which show evidence for correlated behavior. Rapid variations in the TeV γ-ray light curve with doubling and decay times of ≲1 day require a compact emission region and significant Doppler boosting. The TeV data reveal that the γ-ray emission is best characterized by a succession of rapid flares with a relatively low baseline level of steady emission.

Original languageEnglish (US)
Pages (from-to)L9-L12
JournalAstrophysical Journal
Volume472
Issue number1 PART II
DOIs
StatePublished - 1996
Externally publishedYes

Keywords

  • BL Lacertae objects: individual (Markarian 421)
  • Gamma rays: observations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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