Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232...27a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 1, June 1990, p. 27-30. Research supported by SERC, National Advisory
Astronomy and Astrophysics
Astronomy
3
Cosmic Dust, Infrared Spectra, Infrared Spectroscopy, Interstellar Matter, Spiral Galaxies, Galactic Nuclei, Infrared Astronomy Satellite, Interstellar Extinction, Near Infrared Radiation
Scientific paper
Low and intermediate-resolution near infrared spectra of the nucleus of the edge-on spiral galaxy NGC 4565 are presented and compared with corresponding data for IRS 7 in the center of the Galaxy. The 3.0-micron and 3.4-micron interstellar absorption features seen in IRS 7 are both weak or absent in NGC 4565, consistent with an estimated moderate degree of total visual extinction to the nucleus (A(v) about 5-8 magnitudes). These results support recent suggestions that (1) the 3.0-micron absorption in IRS 7 does not arise in the diffuse interstellar medium, but in a dense dark cloud which by chance obscures the Galactic Center; and (2) the 3.4-micron feature is not intrinsic to galactic nuclei, indirectly strengthening the link between this absorption and dust in the diffuse interstellar medium. A probable detection of the 3.3-micron emission feature attributed to polycyclic aromatic hydrocarbons in NGC 4565 is reported. The weakness of the feature is consistent with an origin in normal ambient interstellar material and does not indicate significant starburst activity.
Adamson Andrew J.
Whittet Doug C. B.
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