Ton 599 (4C +29.45) 1.3mm band flaring
ATel #15873; Mark Gurwell (Center for Astrophysics | Harvard & Smithsonian)
on 24 Jan 2023; 19:25 UT
Credential Certification: Mark A. Gurwell (mgurwell@cfa.harvard.edu)
Subjects: Millimeter, Sub-Millimeter, AGN, Blazar, Quasar
The radio loud object J1159+292 = TON 599 = 4C+29.45 is a commonly used calibration source for the Submillimeter Array (SMA, http://sma1.sma.hawaii.edu ). The flux density of this source has been tracked at 1.3mm since 2002. Starting in mid-2022, as reported in other wavebands, this source has shown a strong increase in flux density from a low point in mid-2022, through early 2023. Flaring of this source has been reported across the EM spectrum, from radio, optical, X-ray and gamma-ray bands (Atel #15872, #15859, #15854, #15853, #15870).
Since the beginning of 2023, the SMA has measured the flux density of J1159+292 to be just under 5 Jy at 1.3mm, relative to its low point of 1.36 Jy on 30 Jun 2022. This recent peak slightly exceeds the previous high flux density for this source (4.6 Jy, 14 Jan 2022), and is the highest flux density measurement at 1.3mm since the start of SMA blazar monitoring in 2002 (in 2006 the source briefly exceeded 3.5 Jy).
The SMA will continue to monitor this, and many other, radio loud compact objects.
Two Decade Light Curve of J1159+292 at 1.3mm from SMA
