RADIO SEARCH FOR H{sub 2}CCC TOWARD HD 183143 AS A CANDIDATE FOR A DIFFUSE INTERSTELLAR BAND CARRIER

Journal Article · Sun Jul 01 04:00:00 EDT 2012 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/753/1/L11· OSTI ID:22047715

Araki, Mitsunori; Yamabe, Hiromichi; Tsukiyama, Koichi ^[1]; Takano, Shuro ^[2]; Kuze, Nobuhiko ^[3]

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1. Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku 162-8601, Tokyo (Japan)
2. Nobeyama Radio Observatory and Department of Astronomical Science, The Graduate University for Advanced Studies (Sokendai), 462-2 Nobeyama, Minamimaki, Minamisaku, Nagano 384-1305 (Japan)
3. Department of Materials and Life Sciences, Faculty of Science and Technology, Sophia University, 7-1 Kioi-cho, Chiyoda-ku 102-8554, Tokyo (Japan)

To clarify the authenticity of a recently proposed identification of H{sub 2}CCC (linear-C{sub 3}H{sub 2}) as a diffuse interstellar band (DIB) carrier, we searched for the rotational transition of H{sub 2}CCC at a frequency of 103 GHz toward HD 183143 using the 45 m telescope at the Nobeyama Radio Observatory. Although rms noise levels of 32 mK in the antenna temperature were achieved, detection of H{sub 2}CCC was unsuccessful, producing a 3{sigma} upper limit corresponding to a column density of 2.0 Multiplication-Sign 10{sup 13} cm{sup -2}. The upper limit indicates that the contribution of H{sub 2}CCC to the DIB at 5450 Angstrom-Sign is less than 1/25; thus, it is unlikely that the laboratory bands of the B{sup 1} B{sub 1}-X{sup 1} A{sub 1} transition of H{sub 2}CCC and the DIBs at 5450 Angstrom-Sign (and also 4881 Angstrom-Sign ) toward HD 183143 are related.

• OSTI ID: 22047715
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 753; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ANTENNAS
ASTROPHYSICS
COSMIC RADIO SOURCES
DENSITY
DETECTION
ENERGY-LEVEL TRANSITIONS
GHZ RANGE
HYDROCARBONS
INTERSTELLAR SPACE
MOLECULES
NOISE
RADIOASTRONOMY
ROTATIONAL STATES
TELESCOPES