Other
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..712s&link_type=abstract
Astrophysical Journal, Part 1, vol. 228, Mar. 15, 1979, p. 712-717.
Other
9
Absorption Spectra, Lyman Alpha Radiation, Quasars, Spectral Line Width, Astronomical Spectroscopy, Emission Spectra, Hydroxyl Emission, Optical Thickness, Red Shift
Scientific paper
The equivalent width of the L-alpha emission line has been measured for five QSOs (Ton 1530, 1331+170, 1225+21, OH 471, OQ 172) through two apertures, one 1.0 arcsec in radius, the other 3.5 to 5 arcsec in radius. No increase in equivalent width is seen in the large aperture over the small aperture, putting a limit on the amount of material with velocity within + or - 25,000 km/s relative to the QSO and lying between 10 and 50 kpc from the QSO. This limit corresponds to an average optical depth at the Lyman limit of no more than 0.03. This is true even for OH 471, which has an optical depth much greater than unity as seen from our direction. It is shown that the measurements imply that it is unlikely that the material responsible for the large value of the optical depth in OH 471 can have been ejected from the QSO. Two ways of improving the sensitivity of the observations are briefly discussed.
Boroson Todd A.
Sargent Wallace L. W.
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