ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): Discovery of an Extremely Dense and Compact Object Embedded in the Prestellar Core G208.68-19.92-N2

• DOI: 10.3847/1538-4357/ad09e2
• Publication Date: 2024-01-18T11:46:15Z
• Authors: Naomi Hirano; Dipen Sahu; Sheng-Yaun Liu; Tie Liu; Ken’ichi Tatematsu; Somnath Dutta; Shanghuo Li; Chin-Fei Lee; Pak Shing Li; Shih-Ying Hsu; Sheng-Jun Lin; Doug Johnstone; Leonardo Bronfman; Huei-Ru Vivien Chen; David J. Eden; Yi-Jehng Kuan; Woojin Kwon; Chang Won Lee; Hong-Li Liu; Mark G. Rawlings; Isabelle Ristorcelli; Alessio Traficante
• Keywords: Submillimeter Array; Outflow; Bipolar outflow

Abstract The internal structure of the prestellar core G208.68-19.02-N2 (G208-N2) in Orion Molecular Cloud 3 (OMC-3) region has been studied with Atacama Large Millimeter/submillimeter Array. dust continuum emission revealed a filamentary length ∼5000 au and an average H 2 volume density ∼6 × 10 7 cm −3 . At tip this structure, there is compact object, which we call nucleus , radius ∼150–200 mass ∼0.1 M ⊙ central ∼2 9 radial profile r −1.87±0.11 scaling ∼3.7 times higher than that singular isothermal sphere (SIS). This as well very low virial parameter 0.39 suggests gravity dominant over pressure everywhere nucleus. However, no sign CO outflow localized to traced by N D + 3–2 emission, but not C 18 O 2–1 implying significant depletion due high cold temperature. Toward nucleus, also shows signature depletion. could imply either parent molecule, or presence embedded very-low luminosity source sublimate small area. G208-N2 considered be on verge first hydrostatic (FHSC) formation candidate for FHSC.