2010/09/07 by Masato Tsuboi, Atsushi Miyazaki, Kouichiro Nakanishi +1
Physics and Astronomy · #Amplitude #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Brightness #Brightness temperature #Flux (metallurgy) #Light curve #Millimeter #Pulsars and Gravitational Waves Research #Spectral line #astro-ph.HE
paper · pdf · doi:10.1093/pasj/62.6.1391
4 figures, PASJ, in press
arxiv created 2010/09/07 · openalex publication_date 2010/12/25 · arxiv updated 2015/05/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Abstract Cyg X-3 is a well-known microquasar with a bipolar relativistic jet. Its famous giant radio outbursts have been repeated once every several years. However, the behavior of the millimeter-wave emission has remained unclear because of limitations of time resolution in previous observations. We report here on millimeter wave observations of Cyg X-3 experiencing giant outbursts with one of the finest time resolutions. We have found a series of short-lived flares with amplitudes of 1–2 Jy in the millimeter light curve of the 2008 April–May outburst. They have flat spectra at around 100 GHz. We have also found abrupt and large amplitude flux density changes with e-folding time of 3.6 min or less. The source size of Cyg X-3 is constrained to within 0.4 AU, and the brightness temperature is estimated to be TB \gtrsim 1 × 1011 K.