Radio Search for H2CCC toward HD 183143 as a Candidate for a Diffuse Interstellar Band Carrier

Abstract

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 at a frequency of 103 GHz toward HD 183143 using a 45-m telescope at the Nobeyama Radio Observatory. Although rms noise levels of 32 mK in the antenna temperature were achieved, detection of H2CCC was unsuccessful, producing a 3 sigma upper limit corresponding to a column density of 2.0 \times 1013 cm-2. The upper limit indicates that the contribution of H2CCC to the diffuse interstellar band at 5450 Å is less than 1/25; thus, it is unlikely that the laboratory bands of the B1B1-X1A1 transition of H2CCC and the diffuse interstellar bands at 5450 Å (and also 4881 Å) toward HD 183143 are related.

Astrophysical Journal Letters, accepted

References in corpus (2)

• Identification of H${}_2$CCC as a diffuse interstellar band carrier
• A Search for Interstellar Carbon Chain Alcohol HC4OH in Star-Forming Region L1527 and Dark Cloud TMC-1

Cited by in corpus (4)

• Identification of H${}_2$CCC as a diffuse interstellar band carrier
• C${}_{60}^{+}$ and the Diffuse Interstellar Bands: An Independent Laboratory Check
• A framework for resolving the origin, nature and evolution of the diffuse interstellar band carriers?
• Constraining the size of the carrier of the $\lambda$5797.1 diffuse interstellar band