Analysis and test of the central-blue-spot infall hallmark

Abstract

The infall of material onto a protostar, in the case of optically thick line emission, produces an asymmetry in the blue- and red-wing line emission. For an angularly resolved emission, this translates in a blue central spot in the first-order moment (intensity weighted velocity) map. An analytical expression for the first-order moment intensity as a function of the projected distance was derived, for the cases of infinite and finite infall radius. The effect of a finite angular resolution, which requires the numerical convolution with the beam, was also studied. This method was applied to existing data of several star-forming regions, namely G31.41+0.31 HMC, B335, and LDN 1287, obtaining good fits to the first-order moment intensity maps, and deriving values of the central masses onto which the infall is taking place (G31.41+0.31 HMC: 70-120 $M_{\odot }$; B335: 0.1 $M_{\odot }$; Guitar Core of LDN 1287: 4.8 $M_{\odot }$). The central-blue-spot infall hallmark appears to be a robust and reliable indicator of infall.

arXiv commentAccepted for publication in A&A

References in corpus (13)

• Infall, Outflow, Rotation, and Turbulent Motions of Dense Gas within NGC 1333 IRAS 4
• A CH3CN and HCO+ survey towards southern methanol masers associated with star formation
• A detailed study of the rotating toroids in G31.41+0.31 and G24.78+0.08
• Outflow and Infall in a Sample of Massive Star Forming Regions
• Detection of Infall in the Protostar B335 with ALMA
• No Keplerian Disk >10 AU around the Protostar B335: Magnetic Braking or Young Age?
• Collapsing Hot Molecular Cores: A Model for the Dust Spectrum and Ammonia Line Emission of the G31.41+0.31 Hot Core
• A multi-transition molecular line study of candidate massive young stellar objects associated with methanol masers
• Unveiling the detailed density and velocity structures of the protostellar core B335
• Dense gas and the nature of the outflows
• HfS, Hyperfine Structure Fitting Tool
• Signatures of infall motions in the images of the molecular emission of G31 HMC
• Extreme fragmentation and complex kinematics at the center of the L1287 cloud

Cited by in corpus (9)

• ALMA resolves the hourglass magnetic field in G31.41+0.31
• Digging into the Interior of Hot Cores with ALMA (DIHCA). I. Dissecting the High-mass Star-Forming Core G335.579-0.292 MM1
• Digging into the Interior of Hot Cores with ALMA (DIHCA). II. Exploring the Inner Binary (Multiple) System Embedded in G335 MM1 ALMA1
• Identification of Methyl Isocyanate and Other Complex Organic Molecules in a Hot Molecular Core, G31.41+0.31
• Models of Rotating Infall for the B335 Protostar
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -XIII. Ongoing triggered star formation within clump-fed scenario found in the massive ($\sim 1500$ ${\mathrm{M}}_{\odot }$) clump
• VLA ammonia observations of L1287: analysis of the "Guitar" core and two filaments
• Radiative transfer modeling of the observed line profiles in G31.41+0.31
• Cloud-cloud collision and star formation in G013.313+0.193