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Caroline Gieser (IRAM-Wisc-CAS Seminar)
January 9 @ 9:00 am - 10:00 am
Physical and chemical structure of high-mass star-forming regions with the NOEMA large program CORE
Seminar by Caroline Gieser (MPE-CAS), 9 January 2022, 16h CET
During high-mass star formation, fragmentation takes place on various spatial scales from giant molecular clouds down to disk scales. At the earliest evolutionary stages, high-mass protostars are still deeply embedded within their parental molecular cloud and can be studied best at high spatial resolution with interferometers at mm wavelengths.
The IRAM/NOEMA large program “CORE” allows us to analyze the physical and chemical properties of a sample of luminous high-mass star-forming regions. The 1 mm dust continuum of the sample shows a large diversity of fragmentation properties. Using the spectral line emission, we characterize the physical structure (temperature an density) and quantify the molecular content of individual fragmented cores. Even though all regions are classified to harbor high-mass protostellar objects, the molecular content shows a high degree of complexity. By combining the observed core properties, we are able to estimate chemical timescales with the physical-chemical model MUSCLE.
We find well-constrained density and temperature profiles in agreement with theoretical predictions. The molecular complexity in the core spectra can be explained by an age spread that is then confirmed by our physical-chemical modeling. The hot molecular cores show the greatest number of emission lines, but we also find evolved cores in which most molecules are destroyed and, thus, the spectra appear line-poor once again.
Recording of webinar can be accessed here: https://cloud.iram.fr/index.php/s/MYxCeFWjFdnTxbp