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Title: HOT AND COLD DUST NEAR H II REGIONS

Abstract

We estimate the mass, temperature, and luminosity of the hot ({>=}100 K), cool (20-40 K), and cold ({<=}20 K) dust in the environs of Galactic H II regions using Infrared Astronomical Satellite (IRAS) and Submillimeter Common User Bolometric Array (SCUBA) data. A total of 83 clouds have been examined using IRAS data. A two-component model spectral energy distribution (SED) of hot and cool dust is used to fit the IRAS data. All of the SEDs use a graphite/silicate mix of grains in an MRN distribution. A three-component model SED is fitted to combined SCUBA and IRAS data for 15 clouds near H II regions to measure the cold dust component. Surprisingly, the ratio of the bolometric luminosity of the cool dust to the hot dust appears to be the same (2.8) in virtually all objects. The cool dust has typically four-five orders of magnitude greater mass than the hot dust. However, the mass in cold dust is much greater than the mass in cool and hot dust. We also find some evidence for a relationship between the cool and cold dust masses. These results may prove useful for using IR observations for estimating gas masses in extragalactic systems with activemore » high-mass star formation.« less

Authors:
;  [1]
  1. Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario, N2L 3G1 (Canada)
Publication Date:
OSTI Identifier:
21583079
Resource Type:
Journal Article
Journal Name:
Astronomical Journal (New York, N.Y. Online)
Additional Journal Information:
Journal Volume: 142; Journal Issue: 1; Other Information: DOI: 10.1088/0004-6256/142/1/4; Journal ID: ISSN 1538-3881
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BOLOMETERS; DUSTS; ENERGY SPECTRA; GRAPHITE; LUMINOSITY; MASS; SATELLITES; STARS; CARBON; ELEMENTS; MEASURING INSTRUMENTS; MINERALS; NONMETALS; OPTICAL PROPERTIES; PHYSICAL PROPERTIES; SPECTRA

Citation Formats

Sreenilayam, Gopika, and Fich, Michel, E-mail: gopika@astro.uwaterloo.ca. HOT AND COLD DUST NEAR H II REGIONS. United States: N. p., 2011. Web. doi:10.1088/0004-6256/142/1/4.
Sreenilayam, Gopika, & Fich, Michel, E-mail: gopika@astro.uwaterloo.ca. HOT AND COLD DUST NEAR H II REGIONS. United States. doi:10.1088/0004-6256/142/1/4.
Sreenilayam, Gopika, and Fich, Michel, E-mail: gopika@astro.uwaterloo.ca. Fri . "HOT AND COLD DUST NEAR H II REGIONS". United States. doi:10.1088/0004-6256/142/1/4.
@article{osti_21583079,
title = {HOT AND COLD DUST NEAR H II REGIONS},
author = {Sreenilayam, Gopika and Fich, Michel, E-mail: gopika@astro.uwaterloo.ca},
abstractNote = {We estimate the mass, temperature, and luminosity of the hot ({>=}100 K), cool (20-40 K), and cold ({<=}20 K) dust in the environs of Galactic H II regions using Infrared Astronomical Satellite (IRAS) and Submillimeter Common User Bolometric Array (SCUBA) data. A total of 83 clouds have been examined using IRAS data. A two-component model spectral energy distribution (SED) of hot and cool dust is used to fit the IRAS data. All of the SEDs use a graphite/silicate mix of grains in an MRN distribution. A three-component model SED is fitted to combined SCUBA and IRAS data for 15 clouds near H II regions to measure the cold dust component. Surprisingly, the ratio of the bolometric luminosity of the cool dust to the hot dust appears to be the same (2.8) in virtually all objects. The cool dust has typically four-five orders of magnitude greater mass than the hot dust. However, the mass in cold dust is much greater than the mass in cool and hot dust. We also find some evidence for a relationship between the cool and cold dust masses. These results may prove useful for using IR observations for estimating gas masses in extragalactic systems with active high-mass star formation.},
doi = {10.1088/0004-6256/142/1/4},
journal = {Astronomical Journal (New York, N.Y. Online)},
issn = {1538-3881},
number = 1,
volume = 142,
place = {United States},
year = {2011},
month = {7}
}