ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): A Hot Corino Survey toward Protostellar Cores in the Orion Cloud

Shih-Ying Hsu, Sheng-Yuan Liu, Tie Liu, Dipen Sahu, Chin-Fei Lee, Kenichi Tatematsu, Kee-Tae Kim, Naomi Hirano, Yao-Lun Yang, Doug Johnstone, Hongli Liu, Mika Juvela, Leonardo Bronfman et al.

Keywords: Unified Astronomy Thesaurus concepts: Astrochemistry (75), Interstellar molecules (849), Star forming regions (1565), Low mass stars (2050), Protostars (1302


The presence of complex organic molecules (COMs) in the interstellar medium is of great interest since it may link to the origin and prevalence of life in the universe. Aiming to investigate the occurrence of COMs and their possible origins, we conducted a chemical census toward a sample of protostellar cores as part of the Atacama Large Millimeter/submillimeter Array Survey of Orion Planck Galactic Cold Clumps project. We report the detection of 11 hot corino sources, which exhibit compact emissions from warm and abundant COMs, among 56 Class 0/I protostellar cores. All of the hot corino sources discovered are likely Class 0, and their sizes of the warm region (>100 K) are comparable to 100 au. The luminosity of the hot corino sources exhibits positive correlations with the total number of methanol and the extent of its emissions. Such correlations are consistent with the thermal desorption picture for the presence of hot corinos and suggest that the lower-luminosity (Class 0) sources likely have a smaller region with COM emissions. With the same sample selection method and detection criteria being applied, the detection rates of the warm methanol in the Orion cloud (15/37) and the Perseus cloud (28/50) are statistically similar when the cloud distances and the limited sample size are considered. Observing the same set of COM transitions will bring a more informative comparison between the cloud properties.

Más información

Título de la Revista: The Astrophysical Journal
Volumen: 927, Number 2
Número: Article
Editorial: IOP Publishing
Fecha de publicación: 2022
Página de inicio: Article 218
Página final: 27 pages
Idioma: Inglés
Notas: ISI