3C 345 is a blazar / flat spectrum radio quasar located in the constellation of Hercules. It is noted for hosting a superluminal jet [3] and its variability in almost all wave bands. 3C 345 has an active galactic nucleus that has been categorised as a blazar or as a flat spectrum radio quasar.

2025年3月2日 · The blazar 3C 345 shows an increase in the optical spectral range after 16 month of rather quiet behavior after flare with R = 15.2 mag in October of 2023 (see ATel # 16306). According to our estimates its brightness varied between 16.6 and 17.3 mag since November of 2023 till last January.

measurements expand significantly our ongoing monitoring of 3C 345. In this contribution, we discuss the properties of the jet and its moving components in the immediate vicinity of the core « 3mas). 1. Introduction The 16th magnitude quasar 3C 345 (z=0.595) can be regarded as thearchetypical source for studies of superluminal motion.

Animation of a series of radio images of 3C 345 at 10.7 GHz over the span of 5 years, if the object was really extragalactic at 1700 MegaParsecs as most cosmologists claim, its jets would be exceeding 7 times the speed of light !

2023年12月9日 · We perform a detailed spectral study of \emph {Fermi}-detected FSRQ 3C 345 using synchrotron, synchrotron self Compton (SSC) and EC emission mechanisms. The simultaneous data available in optical, UV, X-ray, and γ -ray energy bands is statistically fitted under these emission mechanisms using the χ2 -minimization technique.

3C 345 is one of the best studied of the so-called superluminal radio sources. It is a core-dominated radio source with a jet that has been studied for more than 20 years using VLBI, and it has been shown that a number of components have been born and have moved away from the central nucleus (Vermeulen & Cohen 1994 ; Zensus, Cohen, & Unwin 1995 ).

2023年12月9日 · In this work, we study the VHE property of the FSRQ 3C 345 through a detailed spectral study involving simultaneous multiwavelength observation in optical/UV, X-ray, and γ-ray energies. Temporal study of the source using multiwavelength light curve by Fermi and Swift suggests the emission at these energy bands are well correlated.

3C 345 is a Quasar located in the constellation of Hercules in the northern hemisphere. 3C 345 is not a Messier Object and doesn't have a Messier Number. A Quasar is a radio active galaxy with particles ejected from a stream at an angle to us. 3C 345 location is 16 42 58.8102993888 (R.A.) and +39 48 37.002763188 (Dec.).

2018年5月16日 · quasar 3C 345. We built the light curve of the source at different frequencies from 2008, the beginning of the Fermi all-sky survey, to 2016, using new data and public archives. In particular we obtained several optical spectra, to study the behavior of emission

自 2000 年代中期以来，平频谱射电类星体 3C 345 一直显示出伽马射线活动以及整个电磁频谱的活动。 2009 年的伽马射线暴成功地与 43 GHz VLBI 观测中的相对论外流联系起来，此后也使用单碟测量进行了分析。 本研究在源的长期演化背景下，对 2009 年耀斑的多波长后续 VLBI 观测以及来自 VLBA-BU-BLAZAR 和 BEAM-ME 计划的 43 GHz 目录数据进行了分析。 我们的目标是探测超紧凑 3C 345 喷气机最内部的几毫秒角秒。 在此过程中，我们分析了内部射流的长期运动 …