A 1-mm spectral line survey toward GLIMPSE Extended Green Objects (EGOs)
J. H. He, S. Takahashi, X. Chen

TL;DR
This study conducts a spectral line survey of 89 EGOs, revealing molecular compositions, dense gas and outflow tracers, and analyzing line luminosity and width correlations to understand the physical conditions of massive star-forming regions.
Contribution
It provides the first comprehensive molecular line catalog for EGOs and analyzes multi-line correlations, highlighting universal properties and increasing randomness with cloud size.
Findings
Detection of eight molecular species, including H13CO+ and SiO.
Strong line luminosity correlations suggest universal cloud properties.
Line width correlations weaken with increasing cloud size, indicating greater randomness.
Abstract
A northern subsample of 89 Spitzer GLIMPSE extended green objects (EGOs), the candidate massive young stellar objects, are surveyed for molecular lines in two 1-GHz ranges: 251.5- 252.5 and 260.188-261.188 GHz. A comprehensive catalog of observed molecular line data and spectral plots are presented. Eight molecular species are undoubtedly detected: H13CO+, SiO, SO, CH3OH, CH3OCH3, CH3CH2CN, HCOOCH3, and HN13C. H13CO+ 3-2 line is detected in 70 EGOs among which 37 ones also show SiO 6-5 line, demonstrating their association to dense gas and supporting the outflow interpretation of the extended 4.5 um excess emission. Our major dense gas and outflow tracers (H13CO+, SiO, SO and CH3OH) are combined with our previous survey of 13CO, 12CO and C18O 1-0 toward the same sample of EGOs for a multi-line multi- cloud analysis of line width and luminosity correlations. Good log-linear correlations…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
