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.

arXiv commentPublished in AJ

References in corpus (37)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Astropy: A Community Python Package for Astronomy
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Embedded Clusters in Molecular Clouds
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Spitzer Space Telescope Mission
• The USNO-B Catalog
• Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
• SCUBA-2: The 10000 pixel bolometer camera on the James Clerk Maxwell Telescope
• SCUBA-2: iterative map-making with the Sub-Millimetre User Reduction Facility
• Young Stellar Objects in the Gould Belt
• Dynamics of Dense Cores in the Perseus Molecular Cloud
• Source extraction and photometry for the far-infrared and sub-millimeter continuum in the presence of complex backgrounds
• The JCMT Gould Belt Survey: First results from the SCUBA-2 observations of the Ophiuchus molecular cloud and a virial analysis of its prestellar core population
• 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
• Gaia-DR2 confirms VLBA parallaxes in Ophiuchus, Serpens and Aquila
• Slingshot Mechanism in Orion: Kinematic Evidence For Ejection of Protostars by Filaments
• The Herschel view of the dense core population in the Ophiuchus molecular cloud
• The Initial Mass Function and Disk Frequency of the Rho Ophiuchi Cloud: An Extinction-Limited Sample
• How do stars gain their mass? A JCMT/SCUBA-2 Transient Survey of Protostars in Nearby Star Forming Regions
• Kinematic Signatures of Subvirial Initial Conditions in Young Clusters
• 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
• The JCMT Legacy Survey of the Gould Belt: a molecular line study of the Ophiuchus molecular cloud
• The JCMT Transient Survey: Stochastic and Secular Variability of Protostars and Disks In the Sub-Millimeter Observed Over Eighteen Months
• A census of $\rho$ Oph candidate members from Gaia DR2
• Filament coalescence and hub structure in MonR2: Implications to massive star and cluster formation
• 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
• The JCMT Gould Belt Survey: Dense Core Clusters in Orion B
• A Novel Survey for Young Substellar Objects with the W-band Filter. I. Filter Design and New Discoveries in Ophiuchus and Perseus
• Large-scale numerical simulations of star formation put to the test: Comparing synthetic images and actual observations for statistical samples of protostars
• 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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