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High Resolution NIR Imaging of the Starburst Galaxy NGC 1808

Published online by Cambridge University Press:  19 July 2016

L.E. Tacconi-Garman ,
A. Krabbe ,
A. Sternberg  and
R. Genzel
L.E. Tacconi-Garman
Affiliation:
Max-Planck-Institut für extraterrestrische Physik
A. Krabbe
Affiliation:
Max-Planck-Institut für extraterrestrische Physik
A. Sternberg
Affiliation:
Tel Aviv University
R. Genzel
Affiliation:
Max-Planck-Institut für extraterrestrische Physik

Abstract

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We report 0.6″ res. J, H, and K and 1.5″ res. imaging of 2.17 μm HI Brγ and 2.12 μm H2 1-0 S(1) line emission towards the nucleus of the starburst galaxy NGC 1808. In the K-band data we (partially) resolve the nucleus and see several small knots in the circumnuclear region. Further, our JHK continuum images show that a large fraction of the near infrared light in NGC 1808 is produced in young star forming clusters. The Brγ emission originates from a compact nuclear source and from several distinct emission knots in the circumnuclear region. These knots are spatially well correlated with a family of compact radio sources, but uncorrelated with the optical “hot spots”. We propose that the Brγ knots trace the actual sites of starburst activity, while the optical hot spots are just directions of low foreground extinction.

We use our data together with radio and far-infrared continuum emission measurements to constrain the parameters of the individual starburst sites in NGC 1808. The data suggest that the starbursts are unsynchronized and prolonged (5 × 106–5 × 107 yrs). The star formation rates in the active sites range from ∼0.1 to ∼0.6 M⊙ yr−1, and the present rapid rate of star-formation in NGC 1808 can be maintained for at most another ∼7 × 107 yrs.

Portions of this work are presently in press (Krabbe, Sternberg, and Genzel 1993), and a second paper is in preparation (Tacconi-Garman et al. 1993).

Type
Poster Contributions: Line Studies
Information
Symposium - International Astronomical Union , Volume 159: Multi-Wavelength Continuum Emission of AGN , 1994 , pp. 461
Copyright
Copyright © Kluwer 1994 

References

Krabbe, A., Sternberg, A., and Genzel, R.: 1993, ‘Near Infrared Spectral Imaging of NGC 1808: Probing the Starburst’, Astrophys. J. , in press CrossRefGoogle Scholar
Tacconi-Garman, L.E., et al.: 1993, in preparation.Google Scholar