A Catalog of Molecular Clumps and Cores with Infall Signatures

Abstract

The research of infall motion is a common means to study molecular cloud dynamics and the early process of star formation. Many works had been done in-depth research on infall. We searched the literature related to infall study of molecular cloud since 1994, summarized the infall sources identified by the authors. A total of 456 infall sources are catalogued. We classify them into high-mass and low-mass sources, in which the high-mass sources are divided into three evolutionary stages: prestellar, protostellar and HII region. We divide the sources into clumps and cores according to their sizes. The H${}_2$ column density values range from 1.21$\times$ 10${}^{21}$ to 9.75 $\times$ 10${}^{24}$ cm${}^{-2}$, with a median value of 4.17$\times$ 10${}^{22}$ cm${}^{-2}$. The H${}_2$ column densities of high-mass and low-mass sources are significantly separated. The median value of infall velocity for high-mass clumps is 1.12 km s${}^{-1}$, and the infall velocities of low-mass cores are virtually all less than 0.5 km s${}^{-1}$. There is no obvious difference between different stages of evolution. The mass infall rates of low-mass cores are between 10${}^{-7}$ and 10${}^{-4}$ M${}_{\odot }{\text{yr}}^{-1}$, and those of high-mass clumps are between 10${}^{-4}$ and 10${}^{-1}$ M${}_{\odot }{\text{yr}}^{-1}$ with only one exception. We do not find that the mass infall rates vary with evolutionary stages.

References in corpus (19)

• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• The dynamics of collapsing cores and star formation
• Infall-Driven Protostellar Accretion and the Solution to the Luminosity Problem
• The local spiral structure of the Milky Way
• High-mass Star Formation through Filamentary Collapse and Clump-fed Accretion in G22
• Infall Motions in Massive Star-Forming Regions: Results from Years 1 & 2 of the MALT90 Survey
• Probing Inward Motions in Starless Cores Using The HCN J = 1-0 Hyperfine Transitions : A Pointing Survey Toward Central Regions
• A Jet-like Outflow toward the High-Mass (Proto)stellar Object IRAS 18566+0408
• A multi-transition molecular line study of inward motions towards massive star-forming cores
• Molecular line profiles as diagnostics of protostellar collapse: modelling the `blue asymmetry' in inside-out infall
• Outflow and Infall in a Sample of Massive Star Forming Regions II: Large Scale Kinematics
• Molecular gas distribution perpendicular to the Galactic plane
• CARMA Large Area Star Formation Survey: Dense Gas in the Young L1451 Region of Perseus
• Searching for Molecular Outflows with Support Vector Machines: Dark Cloud Complex in Cygnus
• The Infall Motion in the Low-Mass Protostellar Binary NGC 1333 IRAS 4A1/4A2
• Infall/Expansion Velocities in the Low-Mass Dense Cores L492, L694-2, and L1521F: Dependence on Position and Molecular Tracer
• Beyond the Solar Circle $-$ Trends in Massive Star Formation Between the Inner and Outer Galaxy
• CO Outflow Candidates Toward the W3/4/5 Complex I: The Sample and its Spatial Distribution
• Gas infalling motions in the envelopes of Very Low Luminosity Objects