Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314..699b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 15, 1987, p. 699-715.
Astronomy and Astrophysics
Astronomy
97
Astronomical Spectroscopy, Quasars, Ultraviolet Astronomy, X Ray Spectroscopy, Infrared Astronomy, Spectral Energy Distribution, Spectral Line Width
Scientific paper
Observations of the quasar PG 1211 + 143 are presented and its continuum is modelled in terms of an accretion disk and an underlying power law. The X-ray spectrum in the Einstein imaging proportional counter band is well described by a power law with the very steep spectral index 2.2 + or - 0.4. The overall continuum spectral energy distribution can be described as a power law with alpha roughly 1.2 from the infrared to about 1 keV, with the optical, ultraviolet, and soft X-rays forming a large excess above this power law. If the soft X-ray excess is attributed to emission from a physically thin, optically thick accretion disk, then the implied accretion rate is super-Eddington, from which it is concluded that the application of this simple model is not valid. The observed broad-line ratios in PG 1211 + 143 imply broad-line cloud densities that are somewhat higher than those usually derived for quasars.
Bechtold Jill
Czerny Bozena
Elvis Martin
Fabbiano Giuseppina
Green Richard F.
No associations
LandOfFree
X-ray spectra of PG quasars. II - The X-ray-ultraviolet excess of PG 1211 + 143 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 X-ray spectra of PG quasars. II - The X-ray-ultraviolet excess of PG 1211 + 143, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray spectra of PG quasars. II - The X-ray-ultraviolet excess of PG 1211 + 143 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1452912