Multifrequency quasi-simultaneous observations of six low-synchrotron peaked blazars

Abstract

© Pleiades Publishing, Ltd., 2015. We made an estimation of the synchrotron peak frequency (ν^s<inf>peak</inf>) of the spectral energy distribution (SED) for six blazars. These objects were selected as very-low-synchrotron peaked (VLSP) blazar candidates (with ν^s<inf>peak</inf> ≤ 10¹³ Hz).We have built the SED of the studied objects using quasi-simultaneous observations on the SAO RAS Zeiss-1000 and RATAN-600 telescopes and made an estimation of the synchrotron peak frequency. As a result, three sources (PKS0446+11, [HB89] 1308+326, and 3C345) were confirmed as VLSP, for the three remaining blazars the calculations have shown ν^s<inf>peak</inf> > 10¹³ Hz.