The IRAS Bright Galaxy Sample. IV. Complete IRAS observations

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Astronomical Journal; (USA)

DOI:https://doi.org/10.1086/115178· OSTI ID:5220414

Soifer, B T; Boehmer, L; Neugebauer, G; Sanders, D B ^[1]

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1. California Institute of Technology, Pasadena (USA)

Total flux densities, peak flux densities, and spatial extents at 12, 25, 60, and 100 microns are presented for the 330 sources in the IRAS Bright Galaxy Sample. The flux density ratios S{sub nu} (60 microns)/S{sub nu} (100 microns) and S{sub nu} (12 microns)/S{sub n} (25 microns) are found to correlate with both the infrared luminosity and the ratio of IR to visible flux. The relation between these two flux density ratios is shown to follow that found previously, with different slopes appearing for the warmer and colder galaxies in the sample. The results suggest that single photon heating of small grains (often the dominant source of 12 and 25 micron radiation from galaxies) significantly affects the emission of some galaxies at 60 microns, and that optical depth effects may alter the emergent radiation at 12 and 25 microns. 31 refs.

• OSTI ID: 5220414
• Journal Information: Astronomical Journal; (USA), Vol. 98; ISSN 0004-6256
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXIES
INFRARED RADIATION
CATALOGS
COSMIC DUST
FLUX DENSITY
HEATING
LUMINOSITY
RADIANT FLUX DENSITY
RADIATION FLUX
SAMPLING
SATELLITES
VISIBLE RADIATION
DOCUMENT TYPES
DUSTS
ELECTROMAGNETIC RADIATION
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
640105* - Astrophysics & Cosmology- Galaxies