Observations of three QSOs with broad, detached absorption features

Details Observations of three QSOs with broad, detached absorption features Observations of three QSOs with broad, detached absorption features

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..488t&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 1, 1980, p. 488-498. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

45

Absorption Spectra, Quasars, Stellar Spectrophotometry, Emission Spectra, Line Spectra, Red Shift, Stellar Mass Ejection

Scientific paper

The spectra of three QSOs (Michigan Curtis Schmidt survey objects 232, 275, and 141) having broad, detached absorption troughs is described. It is found that the material has been ejected at velocities up to approximately 20,000 km/s (and possibly even greater velocities in MCS 141). MCS 141 and particularly MCS 275 are both found to exhibit two distinct and well-separated sets of absorption troughs, suggesting that discrete, explosive ejection episodes rather than continuous outflow occurs. In all of the objects the level of ionization is observed to be very high, and considerable structure is present within some of the absorption troughs. Arguments are given as to why the absorbing material is not simply emission-line material seen in projection against the continuum source. In particular, it is shown that resonance scattering in an expanding circum-QSO shell covering most of the source is unable to explain the observed spectra. This is interpreted to mean that the ejected clouds cover substantially less than 4 pi steradians of the source, which, along with the observed incidence of broad absorption-line objects, suggests that most QSOs are ejecting such material.

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