The complex absorption spectrum of the broad absorption line QSO 1303 + 308

Details The complex absorption spectrum of the broad absorption line QSO 1303 + 308 The complex absorption spectrum of the broad absorption line QSO 1303 + 308

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..450f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 1, 1987, p. 450-459.

Other

59

Absorption Spectra, Astronomical Spectroscopy, Line Spectra, Quasars, Lyman Alpha Radiation, Radial Velocity, Velocity Distribution

Scientific paper

We present spectra of the broad absorption-line QSO (BAL QSO) 1303+308, obtained with the same instrument and detector, separated in time by 2 yr. The spectra are examined for radial velocity variations of a number of the narrowest absorption components making up the broad absorption troughs. The limit on the velocity variations combined with estimates of the radiative acceleration sets a lower limit of about 3 pc on the distance of the absorbing material from the continuum source. The spectra are also examined for temporal variations in the residual intensity of the absorption troughs. A statistically significant variation is seen in the highest (expansion) velocity absorbing material in the sense that the strength of absorption has decreased in the period between spring 1983 and spring 1985. The BAL troughs in this object are extraordinarily complex and show interesting ordered structure. Individual C IV, Si IV, and N V doublets can be identified which are separated from other doublets of the same species by just their doublet spacing. The statistical significance of the excess number of such "line-locked" systems suggests that radiative acceleration may be important in sorting out velocities in the flow of the BAL material. The object is also notable for its paucity of Lyman α emission. Under the assumption that this arises from absorption of the Lyman α emission by the N V broad absorption, the material responsible for the absorption must lie outside of the Lyman α broad emission-line region.

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