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Paper: Circumnuclear Starburst Rings and the AGN--Starburst Connection
Volume: 249, The Central Kiloparsec of Starbursts and AGN: the La Palma Connection
Page: 508
Authors: Schinnerer, E.; Egami, E.; Scoville, N. Z.; Moustakas, L. A.
Abstract: We present a detailed study of the molecular gas, as well as the star formation properties, of two starburst rings in one AGN and one non-AGN galaxy. The circumnuclear molecular gas in the Seyfert 2 galaxy NGC 4303 forms two grand-design spirals which do not coincide with the active star-forming site in the starburst ring. This suggests that the starburst ring is in the process of being formed. The molecular gas in the non-AGN starburst galaxy NGC 7771 is almost entirely situated in the starburst ring. Direct comparison of the tracers of H ii regions (Brγ and He i line emission), red supergiants (H- and K-band stellar absorptions lines), SN remnants (radio continuum, [Fe ii] line emission) to the molecular gas emission, suggests an overall age trend for the ring. However, no strong indication for subsequent star formation within in the ring progressing from one side to the other is evident. Comparison to the two well-known Seyfert galaxies NGC 1068 and NGC 7469 (which have similar host galaxy properties) shows that they contain larger amounts of molecular gas in the central few hundred parsecs than the objects under study.
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