NICT VLBI Observations of Sgr A* at 8 GHz and 2 GHz
ATel #5024; Sekido(NICT), S. Takekawa, T. Oka(Keio Univ.), Tsuboi, Y. Asaki(ISAS/JAXA), Y. Yonekura(Ibaraki Univ.), H. Kaneko, Y. Miyamoto, M. Seta, N. Nakai(Univ. of Tsukuba), O. Kameya, M. Miyoshi(NAOJ), H. Takaba, K. Wakamatsu(Gifu Univ.), Y. Fukuzaki(GSI), T. Morimitsu(Univ. of Tokyo), M. T. Omodaka, T. Handa(Kagoshima Univ., and A. Takumi(OUJ)
on 27 Apr 2013; 22:48 UT
Credential Certification: Masato TSUBOI (tsuboi@vsop.isas.jaxa.jp)
Subjects: Radio, AGN, Black Hole, Transient
We are conducting flux monitoring observations of Sgr A* at 8 GHz and 2 GHz using the NICT Kashima-Koganei VLBI (Kashima-11m RT,Koganei-11m RT). The objective of this monitoring is to search an increase of radio flux induced by the interaction between the G2 cloud and the accretion disk (Gillessen et al. 2012, Nature, 481, 51). The flux density of Sgr A* at 8 GHz was 0.50+-0.04 Jy (preliminary) being stable during the period from DOY=45 to DOY=115. We did not detect 2 GHz emission from Sgr A*, thus the flux density must be below 0.3 Jy. No significant enhancement in the Sgr A fluxes at DOY= 115 was observed. We will continue this monitoring.
