Identifying Three New AGNs Among Fermi Unidentified Gigaelectronvolt Sources
arxiv(2024)
摘要
We report our identification of three gigaelectronvolt γ-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-LAT source catalog as
unidentified ones. We find that the sources all showed γ-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 in
γ-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 to
γ-rays are constructed. Comparing mainly the γ-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.
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