On the absence of interstellar absorption from NGC 4319 in the spectrum of MRK 205

Astronomy and Astrophysics – Astronomy

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Absorption Spectra, Astronomical Spectroscopy, Markarian Galaxies, Quasars, Emission Spectra, Galactic Nuclei, Iue, Metallicity, Spectral Line Width

Scientific paper

Spectroscopic observations of the quasar Mrk 205 are presented. An attempt was made to detect Ca II and Na I absorption from the intervening galaxy NGC 4319. Even though the sight-line to the QSO intercepts the disk and halo of the galaxy within 3-5/h kpc of the nucleus on the plane of the sky, there was no detection of Ca II K to 2sigma equivalent-width limit of 38 mA. While weak Na I D2 and D1 lines may be present, summed IUE spectra show no evidence of Mg II 2797.9 absorption down to a limit of 0.7 A. These results are in marked contrast to the strengths of Ca II, and to a lesser extent Mg II, lines commonly observed in the halo of the Galaxy and in the interstellar medium of nearby galaxies probed by bright supernovae.

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