Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...473l..21s&link_type=abstract
Astrophysical Journal Letters v.473, p.L21
Astronomy and Astrophysics
Astronomy
35
Galaxies: Starburst, Galaxies: Interactions, Galaxies: Individual Ngc Number: Ngc 3310, Ultraviolet: Galaxies
Scientific paper
We present the first far-ultraviolet (FUV; lambda ~ 1500 A) image of the nearby peculiar SAB(r)bc galaxy NGC 3310. The small 15" (945 pc) diameter circumnuclear starburst ring is the most luminous structure, producing 30% of the total observed FUV luminosity. Diffuse emission from the inner disk (20" < R < 40") contributes another ~20% of the observed FUV flux. A linear feature (the "arrow") appears to be a star-forming tidal feature. A diffuse arc observed at optical wavelengths (the "bow") is not visible in the FUV and is probably a tidally induced shell composed of older stars. Mean star formation rates range from 0.031 Msolar yr-1 kpc-2 in the arrow to 2.1 Msolar yr-1 kpc-2 at the brightest FUV source. The striking similarity between the R1/4 law behavior of the FUV and B-band surface brightness profiles, combined with the very blue colors of NGC 3310, strongly argues that the present morphology is the result of a global starburst triggered by a merger with a dwarf companion.
Bohlin Ralph Charles
Bothun Gregory D.
Fanelli Michael N.
Neff Susan G.
O'Connell Robert West
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