Quasar absorption lines

Details Quasar absorption lines Quasar absorption lines

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976comap...6..133g&link_type=abstract

Comments on Modern Physics, Part C - Comments on Astrophysics, vol. 6, Oct. 1976, p. 133-137. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

26

Absorption Spectra, Line Spectra, Quasars, Red Shift, Abundance, Intergalactic Media, Lyman Spectra, Radiation Pressure, Ultraviolet Radiation

Scientific paper

Observations of quasar absorption lines are reviewed, noting that systems of lines in some objects have been convincingly identified with absorption redshifts that are different from the emission redshifts. Evidence for and against line locking between the emission and absorption redshifts in the same object is discussed, and it is suggested that the hypothesis of intervening objects cannot be dismissed on the basis of existing statistical redshift data. Physical properties of absorbing clouds are considered, the role of radiation pressure at the present location of the absorbing clouds is examined, and it is inferred that the clouds should have the form of thin sheets. A direct observational test for the location of the absorbing material is outlined.

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