Q-band line survey observations toward a carbon-chain-rich clump in the Serpens South region
Abstract We have conducted Q-band (30–50 GHz) line survey observations toward a carbon-chain emission peak in the Serpens South cluster-forming region with the extended Q-band (eQ) receiver installed on the Nobeyama 45 m radio telescope. Approximately 180 lines have been detected, including tentative detection, and these lines are attributed to 52 molecules including isotopologues. It has been found that this position is rich in carbon-chain species as much as Cyanopolyyne Peak in the Taurus Molecular Cloud-1 (TMC-1 CP), suggesting chemical youth. Not only carbon-chain species, but also several complex organic molecules (CH$_3$OH, CH$_3$CHO, HCCCHO, CH$_3$CN, and tentatively C$_2$H$_3$CN) have also been detected, which is similar to the chemical complexity found in evolved prestellar cores. The HDCS$/$H$_2$CS ratio has been derived to be $11.3\% \pm 0.5\%$, and this value is similar to the prestellar core L1544. The chemically young features that are similar to the less-dense starless core TMC-1 CP ($10^4$–$10^5\:$cm$^{-3}$) and chemically evolved characters which resemble the dense prestellar core L1544 (${\sim}10^6\:$cm$^{-3}$) mean that the clump including the observed position is a pre-cluster clump without any current star formation activity.
Authors
- You-Ting Yeh
- Ryohei Kawabe (ORCID: https://orcid.org/0000-0002-8049-7525)
- S. Lai (ORCID: https://orcid.org/0000-0001-5522-486X)
- Chen Chien (ORCID: https://orcid.org/0009-0007-8047-0078)
- Yoshinori Yonekura (ORCID: https://orcid.org/0000-0001-5615-5464)
- Yasumasa Yamasaki (ORCID: https://orcid.org/0000-0001-5859-8840)
- Chau-Ching Chiong (ORCID: https://orcid.org/0000-0002-5557-1439)
- Naomi Hirano (ORCID: https://orcid.org/0000-0001-9304-7884)
- Hideko Nomura (ORCID: https://orcid.org/0000-0002-7058-7682)
- Tomomi Shimoikura (ORCID: https://orcid.org/0000-0002-1054-3004)
- Yuh-Jing Hwang (ORCID: https://orcid.org/0000-0002-3931-6243)
- Kazuhito Dobashi (ORCID: https://orcid.org/0000-0001-8058-8577)
- Sheng‐Yuan Liu (ORCID: https://orcid.org/0000-0003-4603-7119)
- Q. Nguyễn Lương (ORCID: https://orcid.org/0000-0003-4574-1585)
- Fumitaka Nakamura
- Atsushi Nishimura (ORCID: https://orcid.org/0000-0003-0732-2937)
- Kotomi Taniguchi (ORCID: https://orcid.org/0000-0003-4402-6475)
- Yasunori Fujii
- Hideo Ogawa
- Chin-Ting Ho
Institutions
- Centre National de la Recherche Scientifique (FR)
- Institute of Astronomy and Astrophysics, Academia Sinica (TW)
- Otsuma Women's University (JP)
- Tokyo Gakugei University (JP)
- National Institutes of Natural Sciences (JP)
- The Graduate University for Advanced Studies, SOKENDAI (JP)
- Université Paris Cité (FR)
- American University of Paris (FR)
- National Tsing Hua University (TW)
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
- Université Paris-Saclay (FR)
- Trường ĐH Nguyễn Tất Thành (VN)
- Astrophysique, Instrumentation et Modélisation (FR)
- Misato Observatory (JP)
- EarthTech International (United States) (US)
- Thai Nguyen University (VN)
- Institute of Astronomy (RU)
- CEA Paris-Saclay (FR)
- Astronomical Observatory (RS)
- National Astronomical Observatory of Japan (JP)
- Osaka Metropolitan University (JP)
- Tay Nguyen University
- Ibaraki University (JP)
- The University of Tokyo (JP)
Publication Details
- Journal
- Publications of the Astronomical Society of Japan
- Published
- 2024-11-08
- DOI
- https://doi.org/10.1093/pasj/psae088
- Citations
- 1
- Primary Topic
- Astrophysics and Star Formation Studies
- Type
- article
- Field-Weighted Citation Impact
- 0.33
Funders
- Japan Society for the Promotion of Science