A survey of interstellar CA II absorption in the haloes of low-redshift galaxies

Astronomy and Astrophysics – Astronomy

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Absorption Spectra, Galactic Structure, Interstellar Matter, Quasars, Red Shift, Absorption Cross Sections, Astronomical Spectroscopy, Dwarf Galaxies, Interacting Galaxies

Scientific paper

Results are reported from a search for Ca II absorption by the haloes of galaxies of redshift z less than 0.2 in the lines of sight to nine QSOs. Data obtained with the AAT or with the 2.5-m Isaac Newton Telescope at the Observatorio del Roque de los Muchachos during 1986-1988 are combined with previously published data and presented in tables, graphs, and sample spectra. The present observations detect no Ca II absorption, down to 2sigma limits of 38-164 mA in equivalent width, except in the case of 1543 + 489. Analysis of previous observations which found Ca II absorption shows that it is confined to galactic disks or inhomogeneously distributed; i.e, present-day galaxies do not have Ca-absorbing spherical haloes with covering factor 1.

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