A search for the HOCO radical in the massive star-forming region Sgr B2(M)

Oyama, Takahiro

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https://hdl.handle.net/2142/96862 Copy

Description

Title

A search for the HOCO radical in the massive star-forming region Sgr B2(M)

Author(s)

Oyama, Takahiro

Contributor(s)

• Endo, Yasuki
• Tsukiyama, Koichi
• Sumiyoshi, Yoshihiro
• Kuze, Nobuhiko
• Takano, Shuro
• Araki, Mitsunori

Issue Date

2017-06-20

Keyword(s)

Astronomy

Abstract

Despite importance of the origin of life, long lasting challenges to detect the simplest amino acid glycine (chem{H_2NCH_2COOH}) in interstellar medium has not been successful. As a preliminary step toward search for glycine, detection of its precursor has received attention. It is considered that glycine is produced by the reaction of the chem{HOCO} radical and the aminomethyl radical(chem{CH_2NH_2}) on interstellar grain surface:_x000d_ \_x000d_ _x000d_ chem{HOCO} + chem{CH_2NH_2} $ rightarrow $ chem{H_2NCH_2COOH}.hspace{15pt} (1)_x000d_ \_x000d_ \_x000d_ chem{HOCO} is produced by the reaction of chem{OH} + chem{CO} $ rightarrow $ chem{HOCO} and/or chem{HCOOH} $ rightarrow $ chem{HOCO} + chem{H}. However, chem{HOCO} and chem{CH_2NH_2} have not been investigated in interstellar medium. Recently, we determined the accurate molecular constants of chem{HOCO}.footnote{T. Oyama $et$ $al$., $J$. $Chem$. $Phys$. {bf 134}, 174303 (2011).} Thus, accurate rest frequencies were derived from the constants. In the present study, we carried out the observations of chem{HOCO} in the massive star-forming region Sgr B2(M), having variety of interstellar molecules, with Nobeyama 45 m radio telescope. Although chem{HOCO} could not be detected in Sgr B2(M), the upper limit of the column density was derived to be 9.0$times $10$^{12}$ cm$^{-2}$ via the spectrum in the 88 GHz region by the rotational diagram method. If the reaction (1) is a main process of the glycine production in this region, an extremely deep search is needed to detect glycine. _x000d_

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/96862

DOI

https://doi.org/10.15278/isms.2017.TA02

Copyright and License Information

Copyright 2017 Takahiro Oyama

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