Multiwavelength Observations of a Flare from Markarian 501 | Zendy

M. Catanese | Zendy; S. M. Bradbury | Zendy; A. C. Breslin | Zendy; J. H. Buckley | Zendy; D. A. CarterLewis | Zendy; M. F. Cawley | Zendy; C. D. Dermer | Zendy; D. J. Fegan | Zendy; J. P. Finley | Zendy; J. A. Gaidos | Zendy; A. M. Hillas | Zendy; W. N. Johnson | Zendy; F. Krennrich | Zendy; R. C. Lamb | Zendy; R. W. Lessard | Zendy; D. J. Macomb | Zendy; J. E. McEnery | Zendy; P. Moriarty | Zendy; J. Quinn | Zendy; A. J. Rodgers | Zendy; H. J. Rose | Zendy; F. W. Samuelson | Zendy; G. H. Sembroski | Zendy; R. Srinivasan | Zendy; T. C. Weekes | Zendy; J. Zweerink | Zendy

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Multiwavelength Observations of a Flare from Markarian 501

Author(s) -

M. Catanese,

S. M. Bradbury,

A. C. Breslin,

J. H. Buckley,

D. A. CarterLewis,

M. F. Cawley,

C. D. Dermer,

D. J. Fegan,

J. P. Finley,

J. A. Gaidos,

A. M. Hillas,

W. N. Johnson,

F. Krennrich,

R. C. Lamb,

R. W. Lessard,

D. J. Macomb,

J. E. McEnery,

P. Moriarty,

J. Quinn,

A. J. Rodgers,

H. J. Rose,

F. W. Samuelson,

G. H. Sembroski,

R. Srinivasan,

T. C. Weekes,

J. Zweerink

Publication year - 1997

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310899

Subject(s) - physics , blazar , bl lac object , astrophysics , observatory , telescope , flare , astronomy , flux (metallurgy) , synchrotron , active galactic nucleus , gamma ray , galaxy , materials science , nuclear physics , metallurgy

We present multiwavelength observations of the BL Lacertae object Markarian501 (Mrk 501) in 1997 between April 8 and April 19. Evidence of correlatedvariability is seen in very high energy (VHE, E > 350 GeV) gamma-rayobservations taken with the Whipple Observatory gamma-ray telescope, data fromthe Oriented Scintillation Spectrometer Experiment of the Compton Gamma-RayObservatory, and quicklook results from the All-Sky Monitor of the Rossi X-rayTiming Explorer while the Energetic Gamma-Ray Experiment Telescope did notdetect Mrk 501. Short term optical correlations are not conclusive but theU-band flux observed with the 1.2m telescope of the Whipple Observatory was 10%higher than in March. The average energy output of Mrk 501 appears to peak inthe 2 keV to 100 keV range suggesting an extension of the synchrotron emissionto at least 100 keV, the highest observed in a blazar and ~100 times higherthan that seen in the other TeV-emitting BL Lac object, Mrk 421. The VHEgamma-ray flux observed during this period is the highest ever detected fromthis object. The VHE gamma-ray energy output is somewhat lower than the 2-100keV range but the variability amplitude is larger. The correlations seen heredo not require relativistic beaming of the emission unless the VHE spectrumextends to >5 TeV.Comment: 10 pages, 2 figures, accepted for publication in ApJ Letter

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