Kavli Affiliate: Seth W. Digel
| First 5 Authors: Fermi-LAT collaboration, :, Soheila Abdollahi, Fabio Acero, Luca Baldini
| Summary:
We present an incremental version (4FGL-DR3, for Data Release 3) of the
fourth Fermi-LAT catalog of gamma-ray sources. Based on the first twelve years
of science data in the energy range from 50 MeV to 1 TeV, it contains 6658
sources. The analysis improves on that used for the 4FGL catalog over eight
years of data: more sources are fit with curved spectra, we introduce a more
robust spectral parametrization for pulsars, and we extend the spectral points
to 1 TeV. The spectral parameters, spectral energy distributions and
associations are updated for all sources. Light curves are rebuilt for all
sources with 1-year intervals (not 2-month intervals).
Among the 5064 original 4FGL sources, 16 were deleted, 112 are formally below
the detection threshold over 12 years (but are kept in the list), while 74 are
newly associated, 10 have an improved association and seven associations were
withdrawn. Pulsars are split explicitly between young and millisecond pulsars.
Pulsars and binaries newly detected in LAT sources, as well as more than 100
newly classified blazars, are reported. We add three extended sources and 1607
new point sources, mostly just above the detection threshold, among which eight
are considered identified and 699 have a plausible counterpart at other
wavelengths.
We discuss degree-scale residuals to the global sky model and clusters of
soft unassociated point sources close to the Galactic plane, which are possibly
related to limitations of the interstellar emission model and missing extended
sources.
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