X-ray spectral evolution of high redshift quasars

Details X-ray spectral evolution of high redshift quasars X-ray spectral evolution of high redshift quasars

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108..759b&link_type=abstract

The Astronomical Journal, vol. 108, no. 3, p. 759-765

Astronomy and Astrophysics

Astronomy

40

Luminosity, Quasars, Radio Astronomy, Radio Emission, Radio Spectra, Red Shift, Spectral Energy Distribution, X Ray Spectra, Evolution (Development), Graphs (Charts), Loudness, Tables (Data), X Rays

Scientific paper

At z approx. equals 3, the x-ray spectra of radio-loud and radio-quiet quasars are different. High-redshift radio-quiet quasars either have large absorbing columns, NH, and steeper power law spectral indices, alphaepsilon, than low redshift quasars, or no absorption and similar alphaepsilon's. In contrast, the radio-loud quasars at high redshift have substantial absorption and similar alphaepsilon's to low redshift quasars. Implications for the interpretation of the evolution of the luminosity function of quasars are discussed. If the absorption arises outside the central engine for both radio-loud and radio-quiet quasars, then radio-quiet quasars differ from the radio-loud quasars in that their emitted power law spectrum has evolved with redshift. We argue that this favors models where quasars are numerous and short-lived, rather than rare and long-lived.

Affiliated with

Also associated with

No associations

Rating

X-ray spectral evolution of high redshift quasars 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 spectral evolution of high redshift quasars, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray spectral evolution of high redshift quasars will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1787320