Observation of the C I 3P2-3P1 line toward the Orion Kleinmann-Low region

Satoshi Yamamoto, Hiroyuki Maezawa, Masafumi Ikeda, Tetsuya Ito, Tomoharu Oka, Gaku Saito, Mitsuhiro Iwata, Kazuhisa Kamegai, Takeshi Sakai, Yutaro Sekimoto, Ken'ichi Tatematsu, Takashi Noguchi, Sheng Cai Shi, Yuji Arikawa, Yoshiyuki Aso, Keisuke Miyazawa, Shuji Saito, Hideo Fujiwara, Masatoshi Ohishi, Hiroyuki OzekiJunji Inatani

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The 3P2-3P1 fine-structure line of the neutral carbon atom (809 GHz) has been observed toward the Orion Kleinmann-Low (KL) region with the Mount Fuji submillimeter-wave telescope. The 6′ × 6′ area centered at Orion KL has been mapped with a grid spacing of 1′.5. The intensity distribution of the 3P2-3P1 line is found to be similar to that of the 3P1-3P0 line; these lines are rather weak toward Orion KL, while they are both bright at Orion KL's northern and southern positions. The excitation temperature determined from the intensity ratio between the 3P2-3P1 and 3P1-3P0 lines ranges from 40 to 110 K. The excitation temperature is not enhanced toward Orion KL, whereas it tends to be high in the vicinity of θ1 Orionis C. These results indicate that the C I emission arises from a photodissociation surface illuminated by strong UV radiation from θ1 Ori C. The relative reduction in the C I intensities toward Orion KL is found to originate from a relatively low excitation temperature rather than from the depletion of the C I column density. The origin of the low-excitation temperature of C I toward Orion KL is discussed in terms of a radiative transfer effect.

Original languageEnglish
JournalAstrophysical Journal
Volume547
Issue number2 PART 2
DOIs
Publication statusPublished - 2001 Feb 1
Externally publishedYes

Fingerprint

radiative transfer
spacing
temperature
carbon
excitation
submillimeter waves
photodissociation
depletion
fine structure
grids
telescopes
radiation
distribution
effect
atoms

Keywords

  • ISM: atoms
  • ISM: clouds
  • ISM: individual (Orion Kleinmann-Low)

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Yamamoto, S., Maezawa, H., Ikeda, M., Ito, T., Oka, T., Saito, G., ... Inatani, J. (2001). Observation of the C I 3P2-3P1 line toward the Orion Kleinmann-Low region. Astrophysical Journal, 547(2 PART 2). https://doi.org/10.1086/318901

Observation of the C I 3P2-3P1 line toward the Orion Kleinmann-Low region. / Yamamoto, Satoshi; Maezawa, Hiroyuki; Ikeda, Masafumi; Ito, Tetsuya; Oka, Tomoharu; Saito, Gaku; Iwata, Mitsuhiro; Kamegai, Kazuhisa; Sakai, Takeshi; Sekimoto, Yutaro; Tatematsu, Ken'ichi; Noguchi, Takashi; Shi, Sheng Cai; Arikawa, Yuji; Aso, Yoshiyuki; Miyazawa, Keisuke; Saito, Shuji; Fujiwara, Hideo; Ohishi, Masatoshi; Ozeki, Hiroyuki; Inatani, Junji.

In: Astrophysical Journal, Vol. 547, No. 2 PART 2, 01.02.2001.

Research output: Contribution to journalArticle

Yamamoto, S, Maezawa, H, Ikeda, M, Ito, T, Oka, T, Saito, G, Iwata, M, Kamegai, K, Sakai, T, Sekimoto, Y, Tatematsu, K, Noguchi, T, Shi, SC, Arikawa, Y, Aso, Y, Miyazawa, K, Saito, S, Fujiwara, H, Ohishi, M, Ozeki, H & Inatani, J 2001, 'Observation of the C I 3P2-3P1 line toward the Orion Kleinmann-Low region', Astrophysical Journal, vol. 547, no. 2 PART 2. https://doi.org/10.1086/318901
Yamamoto, Satoshi ; Maezawa, Hiroyuki ; Ikeda, Masafumi ; Ito, Tetsuya ; Oka, Tomoharu ; Saito, Gaku ; Iwata, Mitsuhiro ; Kamegai, Kazuhisa ; Sakai, Takeshi ; Sekimoto, Yutaro ; Tatematsu, Ken'ichi ; Noguchi, Takashi ; Shi, Sheng Cai ; Arikawa, Yuji ; Aso, Yoshiyuki ; Miyazawa, Keisuke ; Saito, Shuji ; Fujiwara, Hideo ; Ohishi, Masatoshi ; Ozeki, Hiroyuki ; Inatani, Junji. / Observation of the C I 3P2-3P1 line toward the Orion Kleinmann-Low region. In: Astrophysical Journal. 2001 ; Vol. 547, No. 2 PART 2.
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abstract = "The 3P2-3P1 fine-structure line of the neutral carbon atom (809 GHz) has been observed toward the Orion Kleinmann-Low (KL) region with the Mount Fuji submillimeter-wave telescope. The 6′ × 6′ area centered at Orion KL has been mapped with a grid spacing of 1′.5. The intensity distribution of the 3P2-3P1 line is found to be similar to that of the 3P1-3P0 line; these lines are rather weak toward Orion KL, while they are both bright at Orion KL's northern and southern positions. The excitation temperature determined from the intensity ratio between the 3P2-3P1 and 3P1-3P0 lines ranges from 40 to 110 K. The excitation temperature is not enhanced toward Orion KL, whereas it tends to be high in the vicinity of θ1 Orionis C. These results indicate that the C I emission arises from a photodissociation surface illuminated by strong UV radiation from θ1 Ori C. The relative reduction in the C I intensities toward Orion KL is found to originate from a relatively low excitation temperature rather than from the depletion of the C I column density. The origin of the low-excitation temperature of C I toward Orion KL is discussed in terms of a radiative transfer effect.",
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AU - Yamamoto, Satoshi

AU - Maezawa, Hiroyuki

AU - Ikeda, Masafumi

AU - Ito, Tetsuya

AU - Oka, Tomoharu

AU - Saito, Gaku

AU - Iwata, Mitsuhiro

AU - Kamegai, Kazuhisa

AU - Sakai, Takeshi

AU - Sekimoto, Yutaro

AU - Tatematsu, Ken'ichi

AU - Noguchi, Takashi

AU - Shi, Sheng Cai

AU - Arikawa, Yuji

AU - Aso, Yoshiyuki

AU - Miyazawa, Keisuke

AU - Saito, Shuji

AU - Fujiwara, Hideo

AU - Ohishi, Masatoshi

AU - Ozeki, Hiroyuki

AU - Inatani, Junji

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