Identifying Three New AGNs among Fermi Unidentified Gigaelectronvolt Sources  

作　　者：Shun-Hao Ji Zhong-Xiang Wang Qiang-Meng Huang Ruo-Heng Yang 

机构地区：[1]Department of Astronomy,School of Physics and Astronomy,Yunnan University,Kunming 650091,China [2]Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China

出　　处：《Research in Astronomy and Astrophysics》2024年第7期257-267,共11页天文和天体物理学研究（英文版）

基　　金：supported by the Basic Research Program of Yunnan Province(No.202201AS070005);the National Natural Science Foundation of China(NSFC,grant No.12273033);the Original Innovation Program of the Chinese Academy of Sciences(E085021002);support of the science research program for graduate students of Yunnan University(KC-23234629)。

摘　　要：We report our identification of three gigaelectronvoltγ-ray sources,4FGL J0502.6+0036,4FGL J1055.9+6507,and 4FGL J1708.2+5519,as Active Galactic Nuclei(AGNs).They are listed in the latest Fermi-Large Area Telescope source catalog as unidentified ones.We find that the sources all showedγ-ray flux variations in recent years.Using different survey catalogs,we are able to find a radio source within the error circle of each source's position.Further analysis of optical sources in the fields allows us to determine the optical counterparts,which showed similar variation patterns to those seen inγ-rays.The optical counterparts have reported redshifts of 0.6,1.5,and 2.3,respectively,estimated from photometric measurements.In addition,we also obtain an X-ray spectrum of 4FGL J0502.6+0036 and a flux upper limit on the X-ray emission of 4FGL J1055.9+6507 by analyzing the archival data.The broadband spectral energy distributions of the three sources from radio toγ-rays are constructed.Comparing mainly theγ-ray properties of the three sources with those of different sub-classes of AGNs,we tentatively identify them as blazars.Followup optical spectroscopy is highly warranted for obtaining their spectral features and thus verifying the identification.

关 键 词：GAMMA-RAYS galaxies-(galaxies)BL Lacertae objects general-(galaxies)quasars GENERAL 

分 类 号：P15[天文地球—天文学]