The properties of the nuclei of the two hot SPOT galaxies NGC 1097 and 2997

Details The properties of the nuclei of the two hot SPOT galaxies NGC 1097 and 2997 The properties of the nuclei of the two hot SPOT galaxies NGC 1097 and 2997

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..453w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 15, 1986, p. 453-471. SERC-sponsored research.

Astronomy and Astrophysics

Astronomy

12

Barred Galaxies, Galactic Nuclei, Galactic Structure, Abundance, Giant Stars, Infrared Photometry, Iue, K Stars, Markarian Galaxies, Ultraviolet Spectra, Visible Spectrum

Scientific paper

NGC 1097 and 2997 are barred-spiral galaxies with hot spots in annuli around their central red nuclei. IUE low-dispersion spectra of two hot spots in NGC 1097 and of the ensemble of knots in the annulus around the central nucleus of NGC 2997 are presented. In addition, low-dispersion visible spectra of the hot spots and nuclei of both galaxies are analyzed, and near-infrared photometry has been obtained. Both galaxies show UV spectral features of early B supergiants together with A giants. In the optical and near-infrared, the addition of K giants is indicated. The lack of O stars in the UV and the deduced high extinction of the ionized regions favor clumps with cores of obscured O stars. In NGC 2997, the mass in early-type stars in each spot is similar to that of 30 Doradus, whilst for the knots in NGC 1097 the mass is a factor about 10 times larger than for 30 Dor. However, the largest clumps in these galaxies are still a factor of a few times less massive than those observed in irregular Markarian galaxies.

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