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Near-Infrared View of the Nuclear Region of NGC 1808

Published online by Cambridge University Press:  12 April 2016

J. K. Kotilainen
J. K. Kotilainen*
Affiliation:
Tuorla Observatory, University of Turku, Väisäläntie 20, FIN-21500 Piikkiö, Finland

Abstract

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We discuss NIR imaging of the starburst galaxy NGC 1808. The circumnuclear continuum emission shows no morphological change with wavelength and most of it is produced by an evolved bulge population, not by red supergiants or dust. The line emission arises from distinct hot spots. From comparison of Brγ and Hα fluxes, we derive extinction Av = 3–5 toward the hot spots. From modeling of the line and continuum luminosities, we derive a star-formation rate of 0.1–0.6 M⊙ yr–1 and SN rate ~ 0.4–11 × 10–3 yr–1 per hot spot. The age of the burst is 8–17 Myr for the hot spots and ~ 40 Myr for the nucleus. Finally, evidence for and against hidden Seyfert activity in NGC 1808 is discussed.

Type
VI. The Narrow-Line Regions and Beyond
Information
International Astronomical Union Colloquium , Volume 159: Emission Lines in Active Galaxies: New Methods and Techniques , 1997 , pp. 349 - 350
Copyright
Copyright © Astronomical Society of the Pacific 1997

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