Other
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95..408g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, Feb. 1988, p. 408-421.
Other
36
Brightness Distribution, Late Stars, Near Infrared Radiation, Radial Distribution, Spiral Galaxies, Astronomical Models, Astronomical Spectroscopy, Infrared Spectra, Spectral Bands, Three Dimensional Models
Scientific paper
The radial brightness distribution of nine Sc galaxies are studied in the near-infrared J, H, and K bands (1.2, 1.6, and 2.2 microns, respectively). The data were collected at the TIRGO infrared telescope by sampling the luminosity along the major axis using a 28 arcsec aperture. The observed near-infrared colors do not reveal any evidence of internal reddening; neither was it possible to detect any significant radial color gradient, nor color-luminosity effect in the program galaxies. The data are analyzed, with the help of a simple three-dimensional model, in order to obtain global parameters for the disk component, in particular, the sizes of the exponential scale length lambda and the disk central surface brightness mu(0). The main results are: (1) the near-infrared lambdas are not statistically different from those, by other authors, in the B band; (2) the mu(0)'s are clustered around a central value with a spread of roughly 0.8 mag over a range of 3.5 mag in absolute luminosity, again similar to that found at optical wavelengths; and (3) there is no clearcut dependence of mu(0) on the absolute luminosity.
Giovanardi Carlo
Hunt Leslie K.
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