Recent outbursts from Cygnus X-3 observed with the Nasu telescope array at 1.4GHz

ATel #15152; K. Tsubono (Univ. Tokyo), K. Asuma (Asaka High School), K. Niinuma (Yamaguchi Univ.), K. Takefuji (JAXA) and T. Daishido (Waseda Univ.)
on 6 Jan 2022; 14:30 UT
Credential Certification: Kimio Tsubono (tsubono@phys.s.u-tokyo.ac.jp)

Tweet

We have reported the 2021 October outburst from Cyg X-3 observed with the Nasu telescope array at 1.4GHz (ATel #14989, #15018). The observed waveform of the light curve shows rather choppy behavior among those recently obtained from Cygnus X-3.

We also detected a new outburst from 2021 December 25 UT (ATel #15142). The peak flux density was 6.3+-0.03 Jy on December 28 04:45 UT at 1.4GHz. The observed waveform of the light curve was more like a simple single pulse.

Cygnus X-3 light curves at 1.4GHz observed from 2021 October 14 to 2022 January 4 can be seen here.

Recent Swift/BAT data (15-50 keV; http://swift.gsfc.nasa.gov/results/transients/CygX-3/ ) would suggest that Cygnus X-3 is emerging from the quenched state. It will be interesting to see if this is the end of the deep and prolonged hypersoft/quenched state of Cygnus X-3.

The Nasu telescope array is a spatial fast Fourier transform (FFT) interferometer consisting of eight linearly aligned antennas with 20 m spherical dishes. This type of interferometer was developed to survey transient radio sources with an angular resolution as high as that of a 160 m dish and a field of view as wide as that of a 20 m dish.

Nasu telescope array HP: https://nasu-radio-telescope.space