Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46l..49y&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan, vol. 46, no. 3, p. L49-L53
Astronomy and Astrophysics
Astronomy
24
Active Galaxies, Astronomical Observatories, Quasars, X Ray Astronomy, Charge Coupled Devices, X Ray Absorption, X Ray Telescopes
Scientific paper
We report preliminary results of an Advanced Satellite for Cosmology and Astrophysics (ASCA) observation of 3C 273. There is no spectral variability within the ASCA observation, in contrast to the longer term behavior found with European X-ray Observatory Satellite (EXOSAT) and Ginga which established significant changes in the spectral index of the power-law continuum on timescales of a week or more, uncorrelated with luminosity. Comparison of the ASCA data with a simultaneous Roentgen Satellite (ROSAT) Ginga observation in 1990 December shows that while the shape of the spectrum above approximately 1 keV is essentially the same, the flux in the soft component, below approximately 1 keV, considerably weaker relative to the hard component in the ASCA observation. The 2-10 keV luminosity is at least a factor of approximately 1.5 greater in the ASCA observation than in the ROSAT/Ginga observation while the ratio of 2-10 keV luminosity to 0.4-1.0 keV luminosity increases by a factor of approximately 1.2. Thus the spectral shape of the hard component appears to be independent of the relative magnitude of the soft component and is an important constraint on emission and reprocessing models. We find no significant Fe K line-emission in this observation. The data also highlight very well some of the outstanding problems in the instrumental responses.
Hayashida Kiyoshi
Kii Tsuneo
Kotani Taro
Mitsuda Kazuhisa
Murakami Satoshi
No associations
LandOfFree
The X-ray emission of 3C 273 observed with ASCA does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The X-ray emission of 3C 273 observed with ASCA, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The X-ray emission of 3C 273 observed with ASCA will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1507096