Nasu telescope array observations of the recent Cyg X-3 flare at 1.4GHz
ATel #12700; K. Tsubono, K. Asuma, H. Nakajima, T. Daishido (Waseda Univ.), K. Niinuma, T. Aoki (Yamaguchi Univ.), and K. Takefuji (NICT)
on 28 Apr 2019; 03:51 UT
Credential Certification: Kimio Tsubono (tsubono.kimio@aoni.waseda.jp)
Subjects: Radio, Binary, Black Hole, Transient
On April 18, a major radio flare from Cyg X-3 was detected with Metsahovi Radio Observatory at 37 GHz (ATel #12668). Following that, recent enhanced gamma-ray emissions originating from Cyg X-3 were reported by the AGILE team (ATel #12677, #12678).
With the Nasu telescope array, we have been monitoring Cyg X-3 daily from April 14 (drift-scan mode). On April 18, we could observe the appearance of a new activity of Cyg X-3 with the flux level of 1.14 +/- 0.02 Jy (UT 21:45) at 1.4 GHz. During next five days the observed flux was increasing up to 5.9 +/- 0.4 Jy on April 24 21:21 UT. Thirteen days light curve including preceding four days data with five-sigma noise level can be shown in the figure below.
We will continue our radio monitoring for a while.
The Nasu telescope array is a spatial FFT interferometer consisting of linearly aligned eight antennas with 20-m spherical dishes. This type of interferometer was developed to survey transient radio sources with a high angular resolution that of 160-m dish and at the same time with a wide field-of-view that of 20-m dish.
13 days light curve of Cyg X-3 at 1.4GHz
