New VLA multi-line NH3 observations of IRAS 16293-2422 reveal hot gas at 200-300 K near the protostars, attributed to shock and accretion heating.
Which Molecule Traces What:
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ACA Band 7 observations of W28F reveal shocked clumps with nH2 ~ (1-3)×10^5 cm^-3, Tgas ~50-170 K showing density-temperature anti-correlation, pressure balance with hot plasma, E/A-CH3OH ratio >0.9, and CH3OH/SiO spatial-spectral segregation attributed to slow vs fast shocks.
The CH₃OH/CH₃CN ratio in the S68N outflow is constant at ~100-200 and matches gas-phase astrochemical models only when cosmic-ray ionization rates are raised to ~10^{-14} s^{-1}.
The paper proposes the iSEEDs project to integrate machine learning with astrochemistry for extracting physical conditions and molecular abundances from protostellar disk datasets.
citing papers explorer
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Subarcsecond Multi-line Observations of NH$_3$ with VLA toward the Class 0 Source IRAS 16293-2422
New VLA multi-line NH3 observations of IRAS 16293-2422 reveal hot gas at 200-300 K near the protostars, attributed to shock and accretion heating.
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An ACA map of a molecular cloud interacting with supernova remnant W28
ACA Band 7 observations of W28F reveal shocked clumps with nH2 ~ (1-3)×10^5 cm^-3, Tgas ~50-170 K showing density-temperature anti-correlation, pressure balance with hot plasma, E/A-CH3OH ratio >0.9, and CH3OH/SiO spatial-spectral segregation attributed to slow vs fast shocks.
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Probing outflow physics through CH$_3$CN and CH$_3$OH chemistry
The CH₃OH/CH₃CN ratio in the S68N outflow is constant at ~100-200 and matches gas-phase astrochemical models only when cosmic-ray ionization rates are raised to ~10^{-14} s^{-1}.
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Astrochemical Study of Early Embedded Disks
The paper proposes the iSEEDs project to integrate machine learning with astrochemistry for extracting physical conditions and molecular abundances from protostellar disk datasets.