On the distance from quasars to absorbing clouds

Details On the distance from quasars to absorbing clouds On the distance from quasars to absorbing clouds

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227l.113s&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 227, Feb. 1, 1979, p. L113-L116.

Astronomy and Astrophysics

Astronomy

7

Astronomical Spectroscopy, Electromagnetic Absorption, Interstellar Extinction, Quasars, Absorption Spectra, Clouds, Line Spectra, Optical Thickness, Ultraviolet Astronomy

Scientific paper

A lower limit to the distance from a quasar to an absorbing cloud is derived for the case where the quasar spectrum shows resonance absorption lines but not lines from excited fine-structure levels. As first discussed by Bahcall (1967), these limits arise from the requirement that the rate of UV radiative excitation from the continuum emission of the quasar be small. Previous calculations, which assumed that the clouds were optically thin in the lines, found that the clouds must be at least a kiloparsec away from the quasar. Distance limits as derived for the case where the clouds are optically thick, and it is found that the clouds may be within a few parsecs of the quasar.

Affiliated with

Also associated with

No associations

Rating

On the distance from quasars to absorbing clouds 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 On the distance from quasars to absorbing clouds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the distance from quasars to absorbing clouds will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-829010