Sign on

SAO/NASA ADS Astronomy Abstract Service

· Find Similar Abstracts (with default settings below)
· Full Printable Article (PDF/Postscript)
· Scanned Article (GIF)
· Table of Contents
· References in the Article
· Citations to the Article (4) (Citation History)
· Refereed Citations to the Article
· Reads History
·
· Translate This Page
Title:
Unidentified Infrared Emission Bands and Far-Infrared Emission in Various Interstellar Medium
Authors:
Onaka, T.; Mizutani, M.; Chan, K. W.; Tomono, D.; Shibai, H.; Nakagawa, T.; Doi, Y.
Affiliation:
AA(Department of Astronomy, School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan), AB(Subaru Telescope, National Astronomical Observatory of Japan, Hilo, Hawaii 96720, U.S.A.), AC(Department of Physics, School of Science, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan), AD(Institute of Space and Astronautical Science, Sagamihara, Kanagawa 229-8510, Japan), AE(Department of Earth Science and Astronomy, University of Tokyo, Meguro-ku, Tokyo 153-8902, Japan)
Publication:
ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP 456. p.55
Publication Date:
11/2000
Origin:
ADS
Keywords:
INTERSTELLAR DUST, UNIDENTIFIED INFRARED EMISSION BANDS, HII REGIONS, CARINA NEBULA, S171, ρ OPH
Bibliographic Code:
2000ESASP.456...55O

Abstract

Two Hii regions of the Carina nebula and Sharpless 171, and the ρ Oph cloud region have been mapped with PHT-S and LWS full grating scan. The spatial variation in the intensities of the unidentified infrared (UIR) emission bands is examined in relation to the intensity of far-infrared (FIR) emission, which comes from submicron dust grains. The strength of the radiation field was derived from the temperature of the FIR emission. We found that the intensity ratio UIR/FIR is almost constant for 1 < G0 < 103, where G0 is the strength of the incident radiation field in solar units. Furthermore, no systematic variation in the ratio is seen with the spectral type of the heating source (from O3 to B2 types). The ratio, however, shows an appreciable decrease in the ionized region or in the region of G0 > 1000. This may be attributed to the destruction of the UIR band carriers or the inefficient emission mechanism in the ionized region or in the strong radiation field. There may also be an indication that the UIR/FIR ratio increases at the surface of molecular gas in the observed regions, suggesting a possible increase in the abundance of the UIR band carriers. The relative band ratios of the UIRs do not show any systematic variation even at the regions where the decrease in the ratio is observed or at the regions where the enhancement in the ratio is suggested. This indicates that the UIR band carriers are quite stable species, providing an important clue to the understanding of the UIR band carriers and emission mechanism.

Printing Options

Send high resolution image to Level 2 Postscript Printer
Send low resolution image to Level 2 Postscript Printer
Send low resolution image to Level 1 Postscript Printer
Get high resolution PDF image
Get low resolution PDF
Send 300 dpi image to PCL Printer
Send 150 dpi image to PCL Printer

More Article Retrieval Options

HELP for Article Retrieval
Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)
   

Find Similar Abstracts:

Use: Authors
Title
Keywords (in text query field)
Abstract Text
Return: Query Results Return    items starting with number
Query Form
Database: Astronomy
Physics
arXiv e-prints