IRAS Bright Galaxy Sample. III. 1-10 micron observations and coadded IRAS data for galaxies with L(IR) equal to or greater than 10 to the 11th solar luminosities

Journal Article · Mon Feb 01 04:00:00 EST 1988 · Astron. J.; (United States)

DOI:https://doi.org/10.1086/114640· OSTI ID:5236692

Carico, D P; Sanders, D B; Soifer, B T; Elias, J H; Matthews, K

This paper presents the results of 1-10-micron observations and coadded IRAS data on 61 galaxies from the Bright Galaxy Sample, with IR luminosities, L(IR), equal to or greater than 10 to the 11th solar luminosities. It was found that an increase in the total L(IR) above 10 to the 11th solar luminosity is correlated with increased emission from hot dust with characteristic temperatures about 800 K. This hot dust contributes a substantial fraction of the 2.2- and 3.7-micron emission, resulting in a greatly increased dispersion in R(3.7/1.6) and R(2.2/1.6) for these high-luminosity galaxies, relative to lower-luminosity galaxies. This excess hot-dust emission appears to turn on at luminosities of about 10 to the 11th solar luminosity. The spatial distribution of the 10-micron emission indicated a substantial extended component for most of the galaxies in this sample, implying that star-formation processes contribute significantly to the luminosities. 35 references.

• Research Organization: Palomar Observatory, Pasadena, CA (USA)
• OSTI ID: 5236692
• Journal Information: Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 95; ISSN ANJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC DUST
DUSTS
ELECTROMAGNETIC RADIATION
FAR INFRARED RADIATION
FLUX DENSITY
GALAXIES
INFRARED RADIATION
INFRARED SPECTRA
LUMINOSITY
MORPHOLOGY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIANT FLUX DENSITY
RADIATIONS
SPECTRA
STAR EVOLUTION
TEMPERATURE DISTRIBUTION