Multi-wavelength maser observations of the Extended Green Object G19.01—0.03

Gwenllian M. Williams, Claudia J. Cyganowski, Crystal L. Brogan, Todd R. Hunter, John D. Ilee, Pooneh Nazari, Rowan J. Smith

Research output: Contribution to journalArticlepeer-review

Abstract

We report the detections of NH3(3,3) and 25 GHz and 278.3 GHz class I CH3OH maser emission associated with the outflow of the Extended Green Object G19.01-0.03 in sub-arcsecond resolution Atacama Large Millimeter/submillimeter Array (ALMA) and Karl G. Jansky Very Large Array (VLA) observations. For masers associated with the outer outflow lobes (> 12.5 ″ from the central massive young stellar object; MYSO), the spatial distribution of the NH3(3,3) masers is statistically indistinguishable from that of previously known 44 GHz Class I CH3OH masers, strengthening the connection of NH3(3,3) masers to outflow shocks. In sub-arcsecond resolution VLA observations, we resolve the 6.7 GHz Class II CH3OH maser emission towards the MYSO into a partial, inclined ring, with a velocity gradient consistent with the rotationally supported circumstellar disc traced by thermal gas emission.
Original languageEnglish
Pages (from-to)261-263
Number of pages3
JournalProceedings of the International Astronomical Union
Volume18
DOIs
Publication statusPublished - 07 Feb 2024

Keywords

  • masers
  • stars: formation
  • stars: individual: G19.01-0.03
  • stars: massive
  • stars: protostars
  • techniques: interferometric

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