Hostname: page-component-cd9895bd7-7cvxr Total loading time: 0 Render date: 2024-12-28T02:11:41.152Z Has data issue: false hasContentIssue false
  • English
  • Français

Temperature-dependent FIR/sub-mm dust emissivity indices: some implications for the diffuse ISM dust composition

Published online by Cambridge University Press:  25 September 2002

M. Giard ,
J.P. Bernard ,
A. Klotz ,
I. Ristorcelli  and
A. P. Jones
A. P. Jones*
Affiliation:
Institut d'Astrophysique Spatiale (CNRS), Université Paris XI, Orsay, France
Get access

Abstract

We have studied the effects of the laboratory-measured, temperature-dependent dust emissivity indices on the FIR/sub-mmemission properties of amorphous silicate and amorphous carbonaceousdust. When the experimentally-determined temperature dependence of thedust emissivity index is taken into account we find temperatures thatcan differ by as much as 1.5 K and emissivity indices that can differby ~15%, with respect to the values obtained using publishedrefractive index data as is to calculate these quantities. Inaddition, we find that the observed diffuse ISM dust temperature of~17.5 K and emissivity index of 2 can seemingly be produced witha mixture of amorphous carbon and silicate grains only iftemperature-dependent dust emissivity indices are adopted. We findthat dust masses determined using the temperature-dependent dustemissivity indices are not significantly different from those derivedusing standard dust properties.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 4: Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra , 2002 , pp. 37
Copyright
© EAS, EDP Sciences, 2002

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)