Rebrightening of Cygnus X-3 observed with Nasu telescope array at 1.4GHz
ATel #12880; K. Tsubono, K. Asuma, T. Daishido (Waseda Univ.), K. Niinuma, T. Aoki (Yamaguchi Univ.), and K. Takefuji (NICT)
on 21 Jun 2019; 09:23 UT
Credential Certification: Kimio Tsubono (tsubono.kimio@aoni.waseda.jp)
Subjects: Radio, Binary, Black Hole, Transient
Cygnus X-3 shows a renewed bright activity in the last few days.
Several authors reported the recent flaring activity in Cygnus X-3 during last April and May (ATels #12668, #12677, #12678, #12700, #12701, #12741, and #12764).
With the Nasu telescope array, we have been monitoring a specific declination stripe including Cygnus X-3 daily from April 14. On April 18, we could observe the appearance of a new activity of Cygnus X-3 with the flux level of 1.17 +/- 0.02 Jy (UT 21:45) at 1.4 GHz. After that, we could observe the enhanced radio flux with double peaks; one is 6.55 +/- 0.72 Jy (April 23), and the other is 7.94 +/- 0.03 Jy (May 5). On May 24 the observed flux level was fading out below the detection limit.
On June 18 we noticed a renewed bright activity of Cygnus X-3 after a period of 25 days of quiescent state. On June 19 the observed flux level was 5.82 +/- 0.03 Jy (UT 17:37). Sixty-seven days light curve including the most recent few days data can be shown in the figure below.
We will continue our radio monitoring of Cygnus X-3 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.
67 days light curve of Cygnus X-3 at 1.4GHz
