A Movie of PKS 2155-304 in Living Ultraviolet Color

Details A Movie of PKS 2155-304 in Living Ultraviolet Color A Movie of PKS 2155-304 in Living Ultraviolet Color

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.0417u&link_type=abstract

American Astronomical Society, 182nd AAS Meeting, #04.17; Bulletin of the American Astronomical Society, Vol. 25, p.792

Astronomy and Astrophysics

Astronomy

Scientific paper

Extensive monitoring of PKS 2155-304 with IUE in November 1991 revealed rapid large-amplitude variations in the ultraviolet flux of this BL Lac object. Many small, rapid flares are superimposed on a general doubling of the intensity. Spectral changes during the intensity variations are surprisingly small --- the whole spectrum rises and falls more or less uniformly. The ultraviolet and optical (FES) results are described by Urry \ea (1993, ApJ, 411, in press). Here we present these results in a new way, using a movie to convey the dramatic flaring and nearly imperceptible spectral variations. The movie runs at various speeds relative to real time, as well as backwards, the latter demonstrating the approximate time symmetry of the rapid flaring. The ultraviolet luminosity of this active galaxy is ~ 10(46) ergs s(-1) , so the observed 30% changes over a period of 1 day correspond to Delta L / Delta t ~ 5 times 10(40) ergs s(-2) , only a factor of 4 below the fiducial limit for Eddington-limited accretion with efficiency eta =0.1. Given the estimated bolometric correction of ~ 10, it is likely that relativistic beaming is important.

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