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For refcode 1989A&A...215...21D:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1989A&A...215...21D A study of the interstellar medium in line to NGC 5128 from high resolution observations of the supernova 1986G S. D'Odorico, S. di Serego Alighier, M. Pettini, P. Magain, P. E. Nissen, and N. Panagia European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-8046 Garching, Federal Republic of Germany Space Telescope European Coordinating Facility, Karl-Schwarzschild-Strasse 2, D-8046 Garching, Federal Republic of Germany Anglo-Australian Observatory, Epping Laboratory, P.O. Box 296, Epping, NSW 2121, Australia Institute of Astronomy, University of Aarhus, DK-8000 Aarbus C, Denmark Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA Received August 5, accepted November 17, 1988 Summary. We present new high resolution, high S/N ratio spectra of supernova 1986G in NGC 5128 (Cen A). These data allow a detailed study of the rich interstellar absorption spectrum originating in the line of sight to the SN. At least 12 distinct Ca II and Na I absorbing clouds are identified. The gas associated with NGC 5128 is spread over a velocity range of 178 km s^-1^ and it is split in at least 7 components. A new result unique to NGC 5128 is the presence of 3 components with Ca^+^/Na^0^ column densities ratios smaller than 1, that is typical of cool disc gas. This is interpreted as a further indication of the existence of an extended warped disc or a ring of cool gas. From the discussion of the velocities of the absorption components seen in its spectrum it is inferred that the SN was at least half way within the dust and gaseous disc of the galaxy. An intriguing result of this work is the discovery of two absorption components at v_H_ = 236 and 257 km s^-1^, which cannot be easily explained within the velocity field of either the Galaxy or NGC 5128, and may be related to high velocity clouds of neutral hydrogen observed at nearby lines of sight. We detected and measured several diffuse interstellar bands at galactic and NGC 5128 velocities. This is the first time that such a detailed study has been done in a galaxy beyond the Magellanic Cloud. At NGC 5128 velocities, we also detected, for the first time beyond the Local Group, molecular absorption lines of CH and CH^+^ at optical wavelengths. Key words: interstellar medium - galaxies NGC 5128 - supernovae
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