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Short timescale variation in the submillimeter flux of Sagittarius A*
Makoto Miyoshi, Yoshiaki Kato, Yoshiharu Asaki +8
We study short-timescale 340 GHz flux-density variability of Sgr A* using ALMA Cycle 3 observations. Careful self-calibration enabled 10 s snapshot imaging with very high effective…
No Microwave Flare of Sagittarius A* around the G2 Periastron Passing
Masato Tsuboi, Yoshiharu Asaki, Osamu Kameya +11
In order to explore any change caused by the G2 cloud approaching, we have monitored the flux density of Sgr A* at 22 GHz from Feb. 2013 to Aug. 2014 with a sub-array of Japanese V…
Distance and proper motion measurement of water masers in Shapless 269 IRS 2w
Yoshiharu Asaki, Hiroshi Imai, Andrej Mikhailovich Sobolev +1
We present astrometric analysis of archival data of water masers in the star-forming region Sharpless 269 (S269) IRS 2w, observed with the VLBI Exploration of Radio Astrometry. An…
Distance and Proper Motion Measurement of the Red Supergiant, PZ Cas, in Very Long Baseline Interferometry H2O Maser Astrometry
Kozue Kusuno, Yoshiharu Asaki, Hiroshi Imai +1
We present the very long baseline interferometry H2O maser monitoring observations of the red supergiant, PZ Cas, at 12 epochs from 2006 April to 2008 May. We fitted maser motions…
Flaring up of the Compact Cloud G2 during the Close Encounter with Sgr A*
Takayuki R. Saitoh, Junichiro Makino, Yoshiharu Asaki +8
A compact gas cloud G2 is predicted to reach the pericenter of its orbit around the super massive black hole (SMBH) of our galaxy, Sagittarius A* (Sgr A*). This event will give us…
Analysis of H2O Masers in Sharpless 269 using VERA Archival data --- Effect of maser structures on astrometric accuracy
Makoto Miyoshi, Yoshiharu Asaki, Keiichi Wada +1
Astrometry using H2O maser sources in star forming regions is expected to be a powerful tool to study the structures and dynamics of our Galaxy. Honma et al. (2007) (hereafter H200…