Journal
ASTROPHYSICAL JOURNAL
Volume 882, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab311e
Keywords
dust, extinction; ISM: clouds; ISM: kinematics and dynamics; stars: formation; stars: kinematics and dynamics; stars: protostars
Categories
Funding
- NSF [AST-1140063]
- German Science Foundation (DFG) via the Collaborative Research Center [SFB 881]
- Fondecyt [1180350]
- Concurso Proyectos Internacionales de Investigacion [PII20150171]
- Chilean Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA) BASAL grant [AFB-170002]
- Canada Foundation for Innovation
- Canadian Space Agency
- STFC [ST/N00485X/1] Funding Source: UKRI
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We have investigated the formation and kinematics of submillimeter (submm) continuum cores in the Orion A molecular cloud. A comparison between submm continuum and near-infrared extinction shows a continuum core detection threshold of A(v) similar to 5-10 mag. The threshold is similar to the star formation extinction threshold of A(v) similar to 7 mag proposed by recent work, suggesting a universal star formation extinction threshold among clouds within 500 pc to the Sun. A comparison between the Orion A cloud and a massive infrared dark cloud G28.37 +0.07 indicates that Orion A produces more dense gas within the extinction range 15 mag less than or similar to A(v) less than or similar to 60 mag. Using data from the CARMA-NRO Orion Survey, we find that dense cores in the integral-shaped filament (ISF) show subsonic core-to-envelope velocity dispersion that is significantly less than the local envelope line dispersion, similar to what has been found in nearby clouds. Dynamical analysis indicates that the cores are bound to the ISF. An oscillatory core-to-envelope motion is detected along the ISF. Its origin is to be further explored.
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