Universität zu Köln

Onaka, Takashi, Mori, Tamami I. and Okada, Yoko ORCID: 0000-0002-6838-6435 (2015). Dust processing in the Carina nebula region. Planet Space Sci., 116. S. 84 - 92. OXFORD: PERGAMON-ELSEVIER SCIENCE LTD. ISSN 0032-0633

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Abstract

Dust processing in the Carina nebula is investigated based on mid-to far-infrared spectroscopy with Infrared Space Observatory (ISO). Mapping observations over a central 40' x 20' area of the nebula with PHT-S, SWS, and LWS onboard ISO not only reveal spectroscopically that the mid-infrared unidentified infrared (UIR) bands at 6.2, 7.7, 8.6, and 11.3 mu m are absent in the ionized region, but also indicate that the 11.3 mu m may behave differently from the other three UIR bands near the edge of the ionized region, suggesting a variation either in the size distribution or in the ionization fraction of the band carriers. The correlation of [NII]122 mu m and [SiII]35 mu m line emissions observed with SWS and LWS is reinvestigated based on the recent atomic data as well as the latest cosmic abundance, suggesting that a large fraction (>70%), if not all, of silicon returns to the gas phase in the Carina nebula, suggesting that silicates cannot survive under harsh conditions, such as massive star-forming regions. The present observations clearly show dust processing taking place in active regions in the Galaxy. (C) 2015 Elsevier Ltd. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Onaka, Takashi UNSPECIFIED UNSPECIFIED UNSPECIFIED Mori, Tamami I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Okada, Yoko UNSPECIFIED orcid.org/0000-0002-6838-6435 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-391195
DOI:	10.1016/j.pss.2015.03.025
Journal or Publication Title:	Planet Space Sci.
Volume:	116
Page Range:	S. 84 - 92
Date:	2015
Publisher:	PERGAMON-ELSEVIER SCIENCE LTD
Place of Publication:	OXFORD
ISSN:	0032-0633
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language POLYCYCLIC AROMATIC-HYDROCARBON; SPECTRAL ENERGY-DISTRIBUTION; INTERSTELLAR DUST; INFRARED-EMISSION; GLOBAL PROPERTIES; DIFFUSE EMISSION; H-2 EMISSION; PAH EMISSION; UIR BANDS; EVOLUTION Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39119