Far-infrared luminosity functions of normal galaxies

Details Far-infrared luminosity functions of normal galaxies Far-infrared luminosity functions of normal galaxies

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apjs...79..197i&link_type=abstract

Astrophysical Journal Supplement Series (ISSN 0067-0049), vol. 79, no. 2, April 1992, p. 197-211. Research supported by JPL.

Astronomy and Astrophysics

Astronomy

33

Far Infrared Radiation, Infrared Astronomy, Luminosity, Spiral Galaxies, Astronomical Catalogs, Emission Spectra, Hubble Diagram, Infrared Astronomy Satellite

Scientific paper

A volume-limited sample is constructed from the Zwicky catalog and IRAS data base to examine the FIR luminosity functions of normal galaxies, and to investigate possible relationships between FIR emission and galaxy morphology. Quantitative and unbiased treatment is provided by 'survival analysis' statistical methods. It is found that the FIR distributions of normal galaxies are better fit by lognormal than Schechter functions. The total FIR emissivity (8 to 115 microns) of normal galaxies is approximately equal to half their emission in the B plus V optical bands. Normal galaxy FIR emission is uncorrelated with the basic S0-Sm Hubble sequence of spiral galaxy morphology, but appears to be affected by de Vaucouleurs' (1959) revised morphological classifications based on inner rings and S-shaped arms. Spirals with bars and inner rings are systematically fainter than unbarred spirals. It is suggested that bars and rings reduce the amount or spatially confine the dust in spiral disks, resulting in lower efficiency conversion of optical and UV photons into the IR.

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