Multiwavelength Monitoring of the BL Lacertae Object PKS 2155−304 in 1994 May. II. TheIUECampaign

Autor:	Greg Madejski, Thierry J.-L. Courvoisier, Aldo Treves, Paola Grandi, Joseph E. Pesce, Henner Fink, Ian M. George, Steve Penton, Willem Wamsteker, C. Megan Urry, J. Michael Shull, Annalisa Celotti, Renato Falomo, Ron I. Kollgaard, T. Kii, Herman L. Marshall, Elena Pian, Laura Maraschi, Gabriele Ghisellini
Rok vydání:	1997
Předmět:	PKS 2155-304 Physics Spectral index Relativistic beaming Space and Planetary Science ROSAT Flux Astronomy and Astrophysics Astrophysics Light curve Blazar BL Lac object
Zdroj:	The Astrophysical Journal. 486:784-798
ISSN:	1538-4357 0004-637X
DOI:	10.1086/304537
Popis:	PKS 2155-304, the brightest BL Lac object in the ultraviolet sky, was monitored with the IUE satellite at ~1 hour time-resolution for ten nearly uninterrupted days in May 1994. The campaign, which was coordinated with EUVE, ROSAT, and ASCA monitoring, along with optical and radio observations from the ground, yielded the largest set of spectra and the richest short time scale variability information ever gathered for a blazar at UV wavelengths. The source flared dramatically during the first day, with an increase by a factor ~2.2 in an hour and a half. In subsequent days, the flux maintained a nearly constant level for ~5 days, then flared with ~35% amplitude for two days. The same variability was seen in both short- and long-wavelength IUE light curves, with zero formal lag (~
Databáze:	OpenAIRE
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