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Near-Infrared Spectroscopy of NGC 253: Starburst and Surroundings

Published online by Cambridge University Press:  25 May 2016

D. Lutz  and
F. Prada
D. Lutz
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany
F. Prada
Affiliation:
Max-Planck-Institut für extraterrestrische Physik, Postfach 1603, 85740 Garching, Germany

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Near-infrared longslit spectra of NGC 253 obtained with IRSPEC at the ESO NTT are presented. By analysis of the 12CO 2.29μm bandhead we find that the stellar population in the central starburst region (r ∼ 150 pc) rotates more slowly than the gas, but has a velocity dispersion of 128 km/s, about twice the value found for emission lines from the gas in this region. This implies an about five times higher dynamical mass than previously derived (Rieke et al. 1980), removing the need to invoke a lower mass cutoff in the starburst initial mass function. The peak of near-infrared emission is displaced from the dynamical center.

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 171: New Light on Galaxy Evolution , 1996 , pp. 407
Copyright
Copyright © Kluwer 1996 

References

Carral, P., et al. 1994, Astrophys. J. 423, 223 CrossRefGoogle Scholar
Rieke, G.H., et al. 1980, Astrophys. J. 238, 40 CrossRefGoogle Scholar