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Data: CH3OH_I

BRE19 - 84-GHz methanol masers, their relationship to 36-GHz methanol masers and their molecular environments

Short title: Breen et al. (2019)
Authors: Breen, S. L. Contreras, Y. Dawson, J. R. Ellingsen, S. P. Voronkov, M. A. McCarthy, T. P.
Journal: Monthly Notices of the Royal Astronomical Society, Advance Access
Bibcode: 2019MNRAS.484.5072B      BiBTeX

PDF: BRE19.pdf

• Target type: Class_I(36,44)
  Transitions: CH3OH_36(I),CH3OH_84(I)
  

• Abstract

  We present observations of the 36- (4-1 --> 30E) and 84-GHz (5-1 --> 40E) class I methanol maser transitions towards a sample of 94 known class I sites. These observations resulted in 93 and 92 detections in the 84- and 36-GHz transitions. While the majority of the 36-GHz sources have been previously reported, many of the sites are observed in the 84-GHz transition for the first time. The near-simultaneous observations of the two transitions revealed strikingly similar spectral profiles and a mean and median 36- to 84-GHz integrated flux density ratio of 2.6 and 1.4. Alongside the 36- and 84-GHz observations, we included rare class II methanol masers at 37.7-, 38.3-, 38.5-, 86.6- and 86.9-GHz, a number of recombination lines, and thermal molecular transitions. We detect one new site of 86.6- and 86.9-GHz methanol masers, as well as six maser candidates in one or more of 37.7-, 38.3-, 38.5-, 86.6- and 86.9-GHz methanol maser transitions. We detect a relatively higher rate of HC3N compared to that reported by MALT90 (once the respective detection limits were taken into account) who targeted dense dust clumps, suggesting that the class I methanol maser targets incorporate a relatively higher number of warm protostellar sources. We further find that there are similar relationships between the integrated flux density of both class I transitions with the integrated intensity of HC3N, HNC, HCO+, HNC, SiO and H13CO+. We suggest that this indicates that the integrated flux density of the 36- and 84-GHz transitions are closely linked to the available gas volume. eprintid: arXiv:1812.08290

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Position of H2O maser detection DSS colored 2MASS colored WISE colored SDSS color IRAC color I1,I2,I4 GLIMPSE 360 PACS color (70-160 um) SPIRE color (250-500 um) NVSS (1.4GHz) UKIDSS K 2MASS K