Infrared array imaging and spectrophotometry of the nuclear region of the 'hot-spot' galaxy NGC 2903

Details Infrared array imaging and spectrophotometry of the nuclear region of the 'hot-spot' galaxy NGC 2903 Infrared array imaging and spectrophotometry of the nuclear region of the 'hot-spot' galaxy NGC 2903

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335..126s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. 126-134.

Astronomy and Astrophysics

Astronomy

12

Galactic Nuclei, Infrared Sources (Astronomy), Spectrophotometry, Spiral Galaxies, Extremely High Frequencies, H Ii Regions, Spatial Resolution, Star Formation

Scientific paper

Previous studies of the 'hot-spot' galaxy NGC 2903 at a variety of wavelengths have shown that considerable star formation is occurring within the complex hot-spot structures in this galaxy's nuclear region. A K-band (2.2 microns) image of the galaxy's nuclear region has been obtained with an infrared CCD and compared to V-band (0.55 micron) and 1-micron images of the same region. The data show that changes in hot spot morphology in the V band are due primarily to variations in extinction, though variations in stellar populations and densities are also probably important. The K-band/V-band image ratio has been used to map the variation of color across the inner about 20 arcsec of the galaxy. The structures revealed in this image ratio suggest that a dust lane extends through the nucleus. Spectrophotometry of the Br-alpha hydrogen recombination line emission from two positions within the imaged region has also been acquired. The measured line strengths show that ionized gas and active star formation exist well outside of the hot spots.

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