Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..791u&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 15, 1988, p. 791-802.
Astronomy and Astrophysics
Astronomy
27
Bl Lacertae Objects, Ultraviolet Spectra, X Ray Sources, Black Holes (Astronomy), Calibrating, Iue, Jet Flow, Spectrophotometry, X Ray Spectra
Scientific paper
The brightest known BL Lacertae object at ultraviolet wavelengths is PKS 2155-304. Since 1979, 64 ultraviolet spectra of this object have been obtained with the IUE satellite. These have been analyzed in a consistent fashion using Gaussian extraction techniques that maximize the signal to noise. In general, the ultraviolet continuum of the source is well fitted by a power-law model. Over the years the ultraviolet intensity of PKS 2155-304 has varied by a factor of ≡2 but the spectral index has changed very little and is uncorrelated with intensity. A high-resolution soft-X-ray spectrum is compared with a nearly simultaneous IUE spectrum; together they strongly constrain the unobservable extreme-ultraviolet spectral shape.
Hackney R. L.
Hackney R. H. K.
Kondo Yoshihiko
Urry Claudia Megan
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