NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-07-21 T04:14:19 PDT
Help | Comment | NED Home

For refcode 1996MNRAS.283...85A:
Retrieve 30 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Royal Astronomical Society. 1996MNRAS.283...85A 1.2-mm observations of a complete sample of IRAS galaxies - II. Dust properties Paola Andreani and Alberto Franceschini Dipartimento di Astronomia di Padova, vicolo dell'Osservatorio 5,1-35122 Padova, Italy European Southern Observatory, D-85748 Garching, Germany Accepted 1996 June 6. Received 1996 March 18; in original form 1996 January 15 ABSTRACT We present 1.25-mm continuum data for a southern galaxy sample selected from the IRAS Point Source Catalog (PSC) and complete to S_60_ = 2 Jy. Two-thirds of the galaxies have been detected and significant limits on the remaining objects have been set. We find, on a statistical basis, indications that the dust emission in these galaxies is somewhat more centrally concentrated than that of the optical light, possibly tracing a higher metal content in the inner galactic regions. This result also allows us to estimate the aperture corrections to the millimetric data. The latter, together with IRAS photometric data, have been used to compare the broad-band FIR/mm spectra with a simple dust model. According to their far-IR/mm spectrum, the sample galaxies show a dichotomy: almost half of the objects, those displaying bright 25-60 micron fluxes ascribed to warm dust residing in starburst regions, are characterized by higher values of the bolometric (optical + FIR) luminosity, of the dust-to-gas mass ratio, of the dust optical depths and of the overall extinction. A complementary class of objects dominated by cold dust (cirrus) shows opposite trends. Because of the favourable observational setup, selection wavelength and completeness, we believe these data provide an exhaustive and unbiased view of dust properties in spiral galaxies. Key words: dust, extinction - galaxies: ISM - galaxies: photometry - galaxies: spiral - galaxies: starburst - infrared: ISM: continuum.
Retrieve 30 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home