Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...482..167r&link_type=abstract
Astrophysical Journal v.482, p.167
Astronomy and Astrophysics
Astronomy
12
Galaxies: Quasars: Individual Alphanumeric: 3C 273, Ultraviolet: Galaxies, X-Rays: Galaxies
Scientific paper
We present the results of our 1994 January and 1995 January observations of the quasar 3C 273 obtained with the International Ultraviolet Explorer (IUE) and the Extreme-Ultraviolet Explorer (EUVE). These observations were part of a large multiwavelength campaign to observe 3C 273 from radio through gamma -rays. Our 1995 January photometric observations with the EUVE Lexan/B Deep Survey (DS) instrument indicate strong evidence for variability, at a 99% confidence level, during the 12 day observing period. We have utilized ROSAT PSPC soft X-ray power-law models to correlate with EUVE count rates. Besides variations in the normalization level between both observations, our EUV count rates are consistent with a simple power-law model with spectral index alpha ~ 1.77 (F nu ~ nu - alpha ) that can be extrapolated from the soft X-rays to the EUV range. The active galactic nucleus 3C 273 is an important blazar to study because in our picture it reveals the presence of both disk and relativistic beam spectral contributions.
Bruhweiler Fred C.
Fruscione Antonella
Hartman Robert C.
Kafatos Menas
McHardy Ian M.
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