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Observations and Analysis of Absorption Lines including J = K Rotational Levels of CH3CN: The Envelope of Sagittarius B2(M)
Mitsunori Araki, Shuro Takano, Nobuhiko Kuze +5
Molecules in diffuse and translucent clouds experience cooling as a result of radiation and less excitation from collisions. However, a rotation around a molecular axis of acetonit…
Precise observations of the 12C/13C ratios of HC3N in the low-mass star-forming region L1527
Mitsunori Araki, Shuro Takano, Nami Sakai +4
Using the Green Bank 100 m telescope and the Nobeyama 45 m telescope, we have observed the rotational emission lines of the three 13C isotopic species of HC3N in the 3 and 7 mm ban…
Implication of Formation Mechanisms of HC5N in TMC-1 as Studied by 13C Isotopic Fractionation
Kotomi Taniguchi, Hiroyuki Ozeki, Masao Saito +5
We observed the J = 9-8 and 16-15 rotational transitions of the normal species and five 13C isotopologues of HC5N to study its formation mechanisms toward the cyanopolyyne peak in…
Abundance Anomaly of the C Isotopic Species of c-CH in the Low-Mass Star Formation Region L1527
Kento Yoshida, Nami Sakai, Tomoya Tokudome +9
The rotational spectral lines of c-CH and two kinds of the C isotopic species, c-CCCH ( symmetry) and c-CCCH ( symmetry) have been…
Cluster Formation Triggered by Filament Collisions in Serpens South
Fumitaka Nakamura, Koji Sugitani, Tomohiro Tanaka +24
The Serpens South infrared dark cloud consists of several filamentary ridges, some of which fragment into dense clumps. On the basis of CCS (), HCN (), N$_2…
Radio Search for H2CCC toward HD 183143 as a Candidate for a Diffuse Interstellar Band Carrier
Mitsunori Araki, Shuro Takano, Hiromichi Yamabe +2
To clarify the authenticity of a recently proposed identification of H2CCC (linear-C3H2) as a diffuse interstellar band carrier, we searched for the rotational transition of H2CCC…
A Search for Interstellar Carbon Chain Alcohol HC4OH in Star-Forming Region L1527 and Dark Cloud TMC-1
Mitsunori Araki, Shuro Takano, Hiromichi Yamabe +6
We report a sensitive search for the rotational transitions of the carbon chain alcohol HC4OH in the frequency range of 21.2-46.7 GHz in the star-forming region L1527 and the dark…