Near infrared spectroscopy and spectroscopic imaging of NGC253

Details Near infrared spectroscopy and spectroscopic imaging of NGC253 Near infrared spectroscopy and spectroscopic imaging of NGC253

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.290..535w&link_type=abstract

In ESA, Infrared Spectroscopy in Astronomy p 535-537 (SEE N90-19084 11-89)

Astronomy and Astrophysics

Astronomy

6

Hydrogen Clouds, Infrared Spectroscopy, Iron, Near Infrared Radiation, Starburst Galaxies, Infrared Imagery, Infrared Spectra, Line Spectra, Molecular Excitation

Scientific paper

The observations of circular variable filter spectroscopy of NGC 253 are analyzed. The measurements show that shock excited H2 is extended over at least 40 seconds along the major axis. The Brackett gamma and the 1.644 microns (Fe II) line are strong on the nucleus with the 1-0S(1) line of H2 less than half the Br gamma flux. The situation is reversed in the non-nuclear positions with the H2 line the strongest in the spectra. Narrow band H2 images of the central regions of NGC 253 are also presented and discussed. The spectra and the images are used to discuss the excitation mechanisms for the line emission in terms of the nuclear starburst and mass motions along the bar.

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