Universität zu Köln

Onaka, Takashi, Mori, Tamami I., Sakon, Itsuki, Ohsawa, Ryou ORCID: 0000-0001-5797-6010, Kaneda, Hidehiro, Okada, Yoko ORCID: 0000-0002-6838-6435 and Tanaka, Masahiro (2014). SEARCH FOR THE INFRARED EMISSION FEATURES FROM DEUTERATED INTERSTELLAR POLYCYCLIC AROMATIC HYDROCARBONS. Astrophys. J., 780 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4357

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Abstract

We report the results of a search for emission features from interstellar deuterated polycyclic aromatic hydrocarbons (PAHs) in the 4 mu m region with the Infrared Camera (IRC) on board AKARI. No significant excess emission is seen in 4.3-4.7 mu m in the spectra toward the Orion Bar and M17 after the subtraction of line emission from the ionized gas. A small excess of emission remains at around 4.4 and 4.65 mu m, but the ratio of their intensity to that of the band emission from PAHs at 3.3-3.5 mu m is estimated as 2%-3%. This is an order of magnitude smaller than the values previously reported and also those predicted by the model of deuterium depletion onto PAHs. Since the subtraction of the ionized gas emission introduces an uncertainty, the deuterated PAH features are also searched for in the reflection nebula GN 18.14.0, which does not show emission lines from ionized gas. We obtain a similar result that excess emission in the 4 mu m region, if present, is about 2% of the PAH band emission in the 3 mu m region. The present study does not find evidence for the presence of the large amount of deuterated PAHs that the depletion model predicts. The results are discussed in the context of deuterium depletion in the interstellar medium.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Onaka, Takashi UNSPECIFIED UNSPECIFIED UNSPECIFIED Mori, Tamami I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sakon, Itsuki UNSPECIFIED UNSPECIFIED UNSPECIFIED Ohsawa, Ryou UNSPECIFIED orcid.org/0000-0001-5797-6010 UNSPECIFIED Kaneda, Hidehiro UNSPECIFIED UNSPECIFIED UNSPECIFIED Okada, Yoko UNSPECIFIED orcid.org/0000-0002-6838-6435 UNSPECIFIED Tanaka, Masahiro UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-448602
DOI:	10.1088/0004-637X/780/2/114
Journal or Publication Title:	Astrophys. J.
Volume:	780
Number:	2
Date:	2014
Publisher:	IOP PUBLISHING LTD
Place of Publication:	BRISTOL
ISSN:	1538-4357
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LARGE-MAGELLANIC-CLOUD; SOLID CARBON-DIOXIDE; DEUTERIUM ABUNDANCE; STAR-FORMATION; GALACTIC DISK; CAMERA IRC; MILKY-WAY; BANDS; AKARI; SPECTROSCOPY Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44860