Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1785w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Dec. 1990, p. 1785-1793. Research supported by NSF.
Astronomy and Astrophysics
Astronomy
29
Absorption Spectra, Calcium Compounds, Metal Ions, Quasars, Sodium Compounds, Interacting Galaxies, Line Of Sight, Maximum Likelihood Estimates, Red Shift
Scientific paper
Observations of the QSO S4 0248 + 430 and a nearby anonymous galaxy are presented. Two absorption components are found in both Ca II H and K and Na I D1 and D2 at z(a) = 0.0515, 0.0523. Column densities of log N(Ca II) = 13.29, 13.50, and log N(Na I) = 13.79, 14.18 are found for z(a) = 0.0515, 0.0523 absorption systems, respectively. The column density ratios imply considerable calcium depletion and disk-type absorbing gas. At least one and possibly both absorption components are produced by high-velocity gas. A broadband image of the field shows an asymmetrical armlike feature or possible tidal tail covering and extending past the position of the QSO. The presence of this extended feature and the apparent difference between the absorption velocities and galaxy rotation velocity suggest that the absorbing gas is not ordinary disk gas, but rather is a result of tidal disruption.
Burbidge Margaret. E.
Cohen Ross D.
Junkkarinen Vesa T.
Womble Donna Suzanne
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