Detection of CA II absorption in the QSO 0958 + 559 due to a Heiles shell in NGC 3079

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Absorption Spectra, Calcium, Interacting Galaxies, Metallicity, Quasars, Spiral Galaxies, Astronomical Models, Astronomical Spectroscopy, Interstellar Gas, Red Shift

Scientific paper

Optical observations of the QSO 0958 + 559 and the nearby, edge-on spiral galaxy NGC 3079 are presented. Spectra of the QSO show Ca II absorption lines due to extended gas in NGC 3079; the Na absorption lines due to NGC 3079 are not detected. An unrelated higher redshift absorption system at 1.1327 is also present in the QSO spectrum. The QSO sightline shines directly through a Heiles shell. The coincidence in position coupled with the agreement between the Ca II absorption and shell emission velocities demonstrates that the QSO absorption system is due to gas in this shell. This system is discussed in comparison with the six other low-redshift QSO-galaxy pair absorption systems, and the influence of Heiles shells on the interpretation of higher redshift QSO absorption systems is addressed.

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