Atomic Carbon and CO Isotope Emission in the Vicinity of DR 15 | Zendy

Tomoharu Oka | Zendy; Satoshi Yamamoto | Zendy; Mitsuhiro Iwata | Zendy; Hiroyuki Maezawa | Zendy; Masafumi Ikeda | Zendy; Tetsuya Ito | Zendy; Kazuhisa Kamegai | Zendy; Takeshi Sakai | Zendy; Yutaro Sekímoto | Zendy; Ken’ichi Tatematsu | Zendy; Yuji Arikawa | Zendy; Y. Aso | Zendy; Takashi Noguchi | Zendy; ShengCai Shi | Zendy; Keisuke Miyazawa | Zendy; Shuji Saito | Zendy; Hiroyuki Ozeki | Zendy; Hideo Fujiwara | Zendy; Masatoshi Ohishi | Zendy; Junji Inatani | Zendy

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Atomic Carbon and CO Isotope Emission in the Vicinity of DR 15

Author(s) -

Tomoharu Oka,

Satoshi Yamamoto,

Mitsuhiro Iwata,

Hiroyuki Maezawa,

Masafumi Ikeda,

Tetsuya Ito,

Kazuhisa Kamegai,

Takeshi Sakai,

Yutaro Sekímoto,

Ken’ichi Tatematsu,

Yuji Arikawa,

Y. Aso,

Takashi Noguchi,

ShengCai Shi,

Keisuke Miyazawa,

Shuji Saito,

Hiroyuki Ozeki,

Hideo Fujiwara,

Masatoshi Ohishi,

Junji Inatani

Publication year - 2001

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/321536

Subject(s) - atomic carbon , photodissociation , excited state , carbon monoxide , carbon fibers , astrophysics , isotope , molecular cloud , atomic physics , infrared , isotopes of carbon , wavelength , chemistry , physics , hydrogen , materials science , photochemistry , astronomy , optics , nuclear physics , catalysis , biochemistry , stars , composite material , composite number , organic chemistry

We present observations of the 3P1-3P0 fine structure transition of atomiccarbon [CI], the J=3-2 transition of CO, as well as of the J=1-0 transitions of13CO and C18O toward DR15, an HII region associated with two mid-infrared darkclouds (IRDCs). The 13CO and C18O J=1-0 emissions closely follow the darkpatches seen in optical wavelength, showing two self-gravitating molecularcores with masses of 2000 Msun and 900 Msun, respectively, at the positions ofthe catalogued IRDCs. Our data show a rough spatial correlation between [CI] and 13CO J=1-0. Bright[CI] emission occurs in relatively cold gas behind the molecular cores, neitherin highly excited gas traced by CO J=3-2 emission nor in HII region/molecularcloud interface. These results are inconsistent with those predicted bystandard photodissociation region (PDR) models, suggesting an origin forinterstellar atomic carbon unrelated to photodissociation processes.Comment: 11 pages Latex, 6 figures, Accepted for publication in The Astrophysical Journa

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