Interplay between Young Stars and Molecular Clouds in the Ophiuchus Star-forming Complex

Abstract

We present spatial and kinematic correlation between the young stellar population and the cloud clumps in the Ophiuchus star-forming region. The stellar sample consists of known young objects at various evolutionary stages, taken from the literature, some of which are diagnosed with Gaia EDR3 parallax and proper-motion measurements. The molecular gas is traced by the 850 $\mu$m Submillimetre Common-User Bolometer Array-2 image, reaching $\sim$2.3 mJy beam${}^{-1}$, the deepest so far for the region, stacked from the James Clerk Maxwell Telescope/Transient program aiming to detect submillimeter outburst events. Our analysis indicates that the more evolved sources, namely the class II and III young stars, are located further away from clouds than class I and flat-spectrum sources that have ample circumstellar matter and are closely associated with natal clouds. Particularly the class II and III population is found to exhibit a structured spatial distribution indicative of passage of shock fronts from the nearby Sco-Cen OB association thereby compressing clouds to trigger star formation, with the latest starbirth episode occurring now in the densest cloud filaments. The young stars at all evolutionary stages share similar kinematics. This suggests that the stellar patterns trace the relics of parental cloud filaments that now have been dispersed.

Published in AJ

References in corpus (16)

• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• SCUBA-2: iterative map-making with the Sub-Millimetre User Reduction Facility
• Dynamics of Dense Cores in the Perseus Molecular Cloud
• FellWalker - a Clump Identification Algorithm
• Current Star Formation in the Ophiuchus and Perseus Molecular Clouds: Constraints and Comparisons from Unbiased Submillimeter and Mid-Infrared Surveys. II
• How do stars gain their mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star Forming Regions
• The initial conditions of star formation VIII: an observational study of the Ophiuchus cloud L1688 and implications for the prestellar core mass function
• The JCMT Gould Belt Survey: A First Look at Southern Orion A with SCUBA-2
• Filament coalescence and hub structure in MonR2: Implications to massive star and cluster formation
• A census of $\rho$ Oph candidate members from Gaia DR2
• A Survey for New Stars and Brown Dwarfs in the Ophiuchus Star-forming Complex
• The JCMT Transient Survey: Data Reduction and Calibration Methods
• The $\rho$ Oph region revisited with Gaia EDR3
• A Novel Survey for Young Substellar Objects with the W-band Filter. I. Filter Design and New Discoveries in Ophiuchus and Perseus
• Proper motion survey and kinematic analysis of the Rho Ophiuchi embedded cluster
• Spatial Statistics in Star Forming Regions: Testing the Limits of Randomness

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• Understanding the Star Formation Efficiency in Dense Gas: Initial Results from the CAFFEINE Survey with ArTéMiS
• A High-Mass Young Star-forming Core Escaping from Its Parental Filament