Gas infall in the massive star formation core G192.16-3.84

Abstract

Previous observations have revealed an accretion disk and outflow motion in high-mass star-forming region G192.16-3.84. While collapse have not been reported before. We present here molecular line and continuum observations toward massive core G192.16-3.84 with the Submillimeter Array. C${}^{18}$O(2-1) and HCO${}^{+}$(3-2) lines show pronounced blue profiles, indicating gas infalling in this region. This is the first time that the infall motion has been reported in G192.16-3.84 core. Two-layer model fitting gave infall velocities of 2.0$\pm$0.2 and 2.8$\pm$0.1 km s${}^{-1}$. Assuming that the cloud core follows a power-law density profile ($\rho$$\propto$$r^{1.5}$), the corresponding mass infall rates are (4.7$\pm$1.7)$\times 10^{-3}$ and (6.6$\pm$2.1)$\times 10^{-3}$ M$_{\sun}$ yr${}^{-1}$ for C${}^{18}$O(2-1) and HCO${}^{+}$(3-2), respectively. The derived infall rates are in agreement with the turbulent core model and those in other high-mass star-forming regions, suggesting that high accretion rate is a general requirement to form a massive star.

References in corpus (11)

• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Circumventing the radiation pressure barrier in the formation of massive stars via disk accretion
• Infall of gas as the formation mechanism of stars up to 20 times more massive than the Sun
• A necklace of dense cores in the high-mass star forming region G35.20-0.74N: ALMA observations
• A holistic perspective on the dynamics of G035.39-00.33: the interplay between gas and magnetic fields
• Forming an Early O-type Star Through Gas Accretion?
• Signatures of inflow motion in cores of massive star formation: Potential collapse candidates
• Massive molecular outflows associated with UCHII/HII regions
• On the effects of optically thick gas (disks) around massive stars
• SMA observations of the W3(OH) complex: Dynamical differentiation between W3(H${}_2$O) and W3(OH)
• A study of dynamical processes in the Orion KL region using ALMA-- Probing molecular outflow and inflow

Cited by in corpus (3)

• Infall in massive clumps harboring bright infrared sources
• Molecular Clump Extraction Algorithm Based on Local Density Clustering
• A Catalog of Molecular Clumps and Cores with Infall Signatures