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Article overview
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Detection of the longest periodic variability in 6.7 GHz methanol masers of G5.900-0.430 | Yoshihiro Tanabe
; Yoshinori Yonekura
; MacLeod C. Gordon
; | Date: |
4 Jan 2023 | Abstract: | Long term monitoring observations with the Hitachi 32-m radio telescope of
the 6.7 GHz methanol masers associated with the high mass star-forming region
G5.900-0.430 is presented. A period of flux variability at approximately 1260
days, is detected in the features at VLSR = 9.77 and 10.84 km/s while a
secondary shorter period, 130.6 days, is determined for the 0.66 km/s feature.
This is only the second source which has two different periods. The period of
~1260 days is approximately twice as long as the longest known period of 6.7
GHz methanol masers. The variability pattern of the symmetric sine curves and
the consistency with the expected period-luminosity relation suggest that the
mechanism of maser flux variability of 9.77 and 10.84 km/s features in this
source can be explained by protostellar pulsation instability. On the other
hand, because the 0.66 km/s feature has an intermittent and asymmetric
variability profile, we propose this feature is explained by the CWB or spiral
shock models. Obtaining the spatial distribution of the 0.66 km/s feature using
an VLBI will lead to a better understanding of this source. | Source: | arXiv, 2301.01432 | Services: | Forum | Review | PDF | Favorites |
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