Long-term and highly frequent monitor of 6.7 GHz methanol masers to statistically research periodic flux variations around high-mass protostars using the Hitachi 32-m
英文:
Long-term and highly frequent monitor of 6.7 GHz methanol masers to statistically research periodic flux variations around high-mass protostars using the Hitachi 32-m
著者
和文:
Sugiyama, Koichiro,
Yonekura, Y.,
Motogi, K.,
Saito, Y.,
Yamaguchi, T.,
Momose, M.,
Honma, M.,
Hirota, T.,
Uchiyama, M.,
Matsumoto, N.,
Hachisuka, K.,
Inayoshi, K.,
Tanaka, K. E. I.,
Hosokawa, T.,
Fujisawa, K.,
田中圭.
英文:
Sugiyama, Koichiro,
Yonekura, Y.,
Motogi, K.,
Saito, Y.,
Yamaguchi, T.,
Momose, M.,
Honma, M.,
Hirota, T.,
Uchiyama, M.,
Matsumoto, N.,
Hachisuka, K.,
Inayoshi, K.,
Tanaka, K. E. I.,
Hosokawa, T.,
Fujisawa, K.,
Kei Tanaka.
言語
English
掲載誌/書名
和文:
Astrophysical Masers: Unlocking the Mysteries of the Universe
英文:
Astrophysical Masers: Unlocking the Mysteries of the Universe
We initiated a long-term and highly frequent monitoring project toward 442 methanol masers at 6.7 GHz (Dec >-30 deg) using the Hitachi 32-m radio telescope in December 2012. The observations have been carried out daily, monitoring a spectrum of each source with intervals of 9-10 days. In September 2015, the number of the target sources and intervals were redesigned into 143 and 4-5 days, respectively. This monitoring provides us complete information on how many sources show periodic flux variations in high-mass star-forming regions, which have been detected in 20 sources with periods of 29.5-668 days so far (e.g., Goedhart et al. 2004). We have already obtained new detections of periodic flux variations in 31 methanol sources with periods of 22-409 days. These periodic flux variations must be a unique tool to investigate high-mass protostars themselves and their circumstellar structure on a very tiny spatial scale of 0.1-1 au....
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