Simultaneous radio spectrum of MG2 J144640+3110 after its gamma-ray activity
ATel #15948; Mikhailov A. G. (SAO RAS), Kharinov M. A. (IAA RAS), Sotnikova Yu. V. (SAO RAS)
on 16 Mar 2023; 16:22 UT
Credential Certification: Alexander Mikhailov (mag10629@yandex.ru)
Subjects: Radio, AGN, Blazar, Quasar
We report the historical high flux density level for the blazar of unknown type MG2 J144640+3110 at 5-22 GHz. This blazar showed an increasing gamma-ray activity at the beginning of February 2023 (ATel#15888). Daily observations were carried out with the radio telescope RATAN-600 during February 19 - March 01 at 1.2, 2.3, 4.7, 8.2, 11.2 and 22.3 GHz. The averaged flux densities are 0.163 (0.01) Jy at 4.7 GHz , 0.225 (0.02) Jy at 8.2 GHz, 0.236 (0.02) Jy at 11.2 GHz, 0.262 (0.03) Jy at 22.3 GHz. The upper limits are 0.200 Jy at 1.2 GHz and 0.105 Jy at 2.3 GHz.
The spectral shape is inverted with spectral index values +0.58 (0.06) at 4.7-8.2 GHz and +0.15 (0.05) at 8.2-22.3 GHz.
Additional measurements were carried out with the radio telescopes RT-32 in Zelenchukskaya and Badary observatories (Institute of Applied Astronomy, Russian Academy of Sciences, https://iaaras.ru/en/quasar/) during the sessions on March 04-05 2023. The obtained flux at 5.05 GHz is 0.194 (0.014) Jy on March 4, and 0.161 (0.08) Jy on March 5. At 8.63 GHz we obtained the flux density 0.255 (0.015) Jy on March 4, and 0.225 (0.010)/0.303 (0.028) Jy on March 5.
We constructed a radio spectrum of MG2 J144640+3110 including the RATAN-600, RT-32 measurements and literature data (see the compiled radio spectrum at the link below). The flux density measurements in February-March are 2-3 times more historical data at the corresponding frequencies. We will plan the following MG2 J144640+3110 observations.
The radio spectrum of MG2 J144640+3110 including the RATAN-600 and RT-32 measurements
