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20 April 2024 |
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Methanol Masers as Tracers of Circumstellar Disks | | R. P. Norris
; S. E. Byleveld
; P. J. Diamond
; S. P. Ellingsen
; R. H. Ferris
; R. G. Gough
; M. J. Kesteven
; P. M. McCulloch
; C. J. Phillips
; J. E. Reynolds
; A. K. Tzioumis
; Y. Takahashi
; E. R. Troup
; K. J. Wellington
; | | Date: |
21 Jun 1998 | | Subject: | astro-ph | | Abstract: | We show that in many methanol maser sources the masers are located in lines, with a velocity gradient along them which suggests that the masers are situated in edge-on circumstellar, or protoplanetary, disks. We present VLBI observations of the methanol maser source G309.92+0.48, in the 12.2 GHz transition, which confirm previous observations that the masers in this source lie along a line. We show that such sources are not only linear in space but, in many cases, also have a linear velocity gradient. We then model these and other data in both the 6.7 GHz and the 12.2 GHz transition from a number of star formation regions, and show that the observed spatial and velocity distribution of methanol masers, and the derived Keplerian masses, are consistent with a circumstellar disk rotating around an OB star. We consider this and other hypotheses, and conclude that about half of these methanol masers are probably located in edge-on circumstellar disks around young stars. This is of particular significance for studies of circumstellar disks because of the detailed velocity information available from the masers. | | Source: | arXiv, astro-ph/9806284 | | Services: | Forum | Review | PDF | Favorites | |
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