On the origin of the absorption spectra of quasistellar and BL Lacertae objects

Details On the origin of the absorption spectra of quasistellar and BL Lacertae objects On the origin of the absorption spectra of quasistellar and BL Lacertae objects

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218...33b&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 33-38. NSF-supported research;

Astronomy and Astrophysics

Astrophysics

81

Absorption Spectra, Galactic Structure, Quasars, Variable Stars, Astronomical Spectroscopy, Clouds, Coronas, Halos

Scientific paper

Following the earlier work of Wagoner (1967) we have reexamined the possibility that the absorption spectra of QSOs are due to gas in the disks, coronae, or halos of intervening galaxies. Comparison of the expected number of absorption systems with the number observed in all of the QSOs and BL Lacertae objects so far cataloged shows that there is a gross discrepancy in the sense that the multiplicity of absorption systems already found is far higher than the numbers expected if the absorption is due to gas in known disks or hypothetical small coronae. A discussion of the selection effects suggests that the number of absorption systems so far reported is an underestimate, so that an even greater discrepancy is likely to be present. High multiplicities can be explained only if very large halos or clouds containing heavy elements are commonly present, and there is no independent evidence for this. We conclude that the bulk of the absorption is likely to be intrinsic to the QSOs.

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