Ultraviolet Imaging Telescope observations of the ScI galaxy NGC 628 (M74)

Details Ultraviolet Imaging Telescope observations of the ScI galaxy NGC 628 (M74) Ultraviolet Imaging Telescope observations of the ScI galaxy NGC 628 (M74)

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...395l..41c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 395, no. 1, p. L41-L43.

Other

15

Galactic Nuclei, Galactic Structure, Spiral Galaxies, Ultraviolet Telescopes, Image Analysis, Spatial Distribution, Star Formation

Scientific paper

Ultraviolet images of NGC 628 at 1520 and 2490 A show that the nucleus has an oblong appearance and that the arms and disk exhibit features not seen in blue or H-alpha images. Aperture photometry of the nucleus gives results that are compatible with observations in other bandpasses and with models. The spiral arms appear more symmetrical in the UV than in other colors; in particular, two gaps are seen on either side of the nucleus. Combined UV and radio data appear to support a large-scale collective phenomenon, perhaps a quasi-static spiral structure mechanism, as being the dominant mode of spiral formation in this galaxy. We report the detection of a low surface brightness object at a distance of 7.6 arcmin southwest of the nucleus.

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