The Spatial Distribution of Organics toward the High-mass YSO NGC 7538 IRS9

Karin I. Oeberg*, Mavis D. Boamah, Edith C. Fayolle, Robin T. Garrod, Claudia J. Cyganowski, Floris van der Tak

*Corresponding author for this work

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Abstract

Complex molecules have been broadly classified into three generations dependent on the mode of formation and the required formation temperature (100 K). Around massive young stellar objects (MYSOs), icy grain mantles and gas are exposed to increasingly higher temperatures as material accretes from the outer envelope in toward the central hot region. The combination of this temperature profile and the generational chemistry should result in a changing complex molecular composition with radius around MYSOs. We combine IRAM 30 m and Submillimeter Array observations to explore the spatial distribution of organic molecules around the high-mass young stellar object NGC 7538 IRS9, whose weak complex molecule emission previously escaped detection. We find that emission from N-bearing organics and CH3OH present substantial increases in emission around 8000 AU and R

Original languageEnglish
Article number95
Number of pages16
JournalAstrophysical Journal
Volume771
Issue number2
DOIs
Publication statusPublished - 10-Jul-2013

Keywords

  • astrochemistry
  • circumstellar matter
  • ISM: individual objects (NGC 7538 IRS9)
  • molecular processes
  • stars: formation
  • stars: massive
  • STAR-FORMING REGIONS
  • BIPOLAR MOLECULAR OUTFLOWS
  • YOUNG STARS
  • HOT CORES
  • COMPLEX CHEMISTRY
  • METHANOL MASERS
  • CHEMICAL-MODEL
  • NGC-7538 IRS-9
  • LINE SURVEY
  • PROTOSTARS

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