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7 - Sagittarius B2

from Part III - High-Mass Star Formation (HMSF)

Published online by Cambridge University Press:  11 April 2023

Duncan MacKay
Affiliation:
University of Kent, Canterbury
Mark Thompson
Affiliation:
University of Leeds
James Urquhart
Affiliation:
University of Kent, Canterbury
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Summary

Sagittarius (Sgr) B2 is the most massive star-forming region in the Galaxy and the canonical HMSFR with probably the richest source of molecules detected to date, not least in the number of COMs recorded. The consequences of a variable and higher-than-standard cosmic ionization rates in this region close to the Galactic centre are discussed. They are seen to have a complex effect on COMs chemistries, offering both an unusual test bed for chemical evolution theory, while not being conditions representative of more widely observed HMSF cores. The particular case of cyanides and isocyanides stands out, and modelling that uses enhanced but extinction-dependent CR ionization rate brings best agreement between model results and observations. Nonetheless, the modelled column densities of some species are much lower than observed, and the physical structure profile of the regions appears to be responsible.

Type
Chapter
Information
Case Studies in Star Formation
A Molecular Astronomy Perspective
, pp. 124 - 133
Publisher: Cambridge University Press
Print publication year: 2023

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  • Sagittarius B2
  • Duncan MacKay, University of Kent, Canterbury, Mark Thompson, University of Leeds, James Urquhart, University of Kent, Canterbury
  • Book: Case Studies in Star Formation
  • Online publication: 11 April 2023
  • Chapter DOI: https://doi.org/10.1017/9781009277433.008
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  • Sagittarius B2
  • Duncan MacKay, University of Kent, Canterbury, Mark Thompson, University of Leeds, James Urquhart, University of Kent, Canterbury
  • Book: Case Studies in Star Formation
  • Online publication: 11 April 2023
  • Chapter DOI: https://doi.org/10.1017/9781009277433.008
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Sagittarius B2
  • Duncan MacKay, University of Kent, Canterbury, Mark Thompson, University of Leeds, James Urquhart, University of Kent, Canterbury
  • Book: Case Studies in Star Formation
  • Online publication: 11 April 2023
  • Chapter DOI: https://doi.org/10.1017/9781009277433.008
Available formats
×