Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000isass..14...83o&link_type=abstract
The Institute of Space and Astronautical Science Report SP No. 14, p. 83-90.
Astronomy and Astrophysics
Astronomy
Interstellar Dust, Interstellar Depletion, Supernovae, Infrared Spectroscopy, Uir Bands
Scientific paper
The origin of interstellar dust grains is investigated based on the latest observations of the gas phase abundance and the features seen in the infrared spectra of various objects as well as in the diffuse galactic radiation. In contrast to the prediction by standard dust models, iron seems to remain mostly in solid phase even in the intercloud region, suggesting that the contribution from supernovae would be significant for iron-bearing interstellar grains. The 22 micron band detected in a supernova remnant, HII regions, and external galaxies, may be attributed to iron-bearing grains formed in supernova ejecta, though the identification of the band needs further investigation. Observations of the unidentified infrared (UIR) emission bands in the diffuse galactic radiation suggest that the band carriers should be formed in the interstellar space. Observations of the UIR bands in normal galaxies with various star-formation activities suggest that the in situ formation of the carriers in dense cloud regions is likely a dominant source for the band carriers, but there is some observational evidence that implies the formation in intercloud regions. Further studies are clearly needed to elucidate the origin and destruction of the carriers. Observations of dust properties in external galaxies are highly important to investigate the dust model since each dust component is supposed to have a different origin and evolution history, which should appear as variations in the infrared spectrum. A large-aperture cooled telescope, such as HII/L2, is strongly needed to pursue this kind of investigations and lead to the ``unified dust model''.
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