On the nuclear spectrum of NGC 1365

Details On the nuclear spectrum of NGC 1365 On the nuclear spectrum of NGC 1365

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198.1089e&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 198, Mar. 1982, p. 1089-1107.

Astronomy and Astrophysics

Astronomy

47

Astronomical Spectroscopy, Barred Galaxies, Emission Spectra, Galactic Nuclei, Galactic Structure, Seyfert Galaxies, Abundance, Balmer Series, H Ii Regions, Hydrogen, Interstellar Extinction, Iron, Oxygen, Spatial Resolution, Spectral Energy Distribution

Scientific paper

Long-slit spectroscopic observations of the NGC 1365 galaxy's nucleus show an apparently typical, intermediate Seyfert spectrum in which the broad Balmer lines exhibit an asymmetry towards the violet. The Seyfert 2 spectrum comes from a region several hundred parsecs in extent, containing at least a million solar masses of ionized gas. The Seyfert nucleus is surrounded by normal H II complexes with high oxygen abundance, continuing the slow, inward increase of heavy-element abundances found for H II regions in the spiral arms and bar. All the emission-line systems are heavily reddened. The possible role of non-thermal excitation must be allowed for in the derivation of abundances from emission lines in galactic nuclei.

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