Observations and starburst models of NGC 520

Details Observations and starburst models of NGC 520 Observations and starburst models of NGC 520

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...270...20b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 270, no. 1-2, p. 20-28.

Astronomy and Astrophysics

Astrophysics

22

Astronomical Models, Galactic Evolution, H Alpha Line, Interacting Galaxies, Starburst Galaxies, Gas Dynamics, Radial Velocity, Stellar Mass

Scientific paper

CCD images in B, V, R, I, and in the light of the emission line H-alpha have been obtained as well as 11 long-slit spectra. Color maps and radial velocity maps show that the irregular galaxy NGC 520 consists of two interacting components which are very likely on a bound orbit and are going to merge. The more massive component is seen almost edge-on and has a warp of about 27. Its nuclear region coincides with the radio continuum source and shows an active starburst which, at visual wavelengths, is almost hidden behind the dust lane of the disk. The spectra of the less massive, although visually brighter, second component northwest of the main component indicate a post-starburst some 2-3 x 10 exp 8 years old. Numerical starburst models, which were fitted to the data of both components, indicate that both starbursts might be deficient in low-mass stars.

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