A Combined Radio Multi-Survey Catalog of Fermi Unassociated Sources

Abstract

Approximately one-third of existing $\gamma$-ray sources identified by the $\text{Fermi Gamma-Ray Space Telescope}$ are considered to be unassociated, with no known counterpart at other frequencies/wavelengths. These sources have been the subject of intense scrutiny and observational effort during the observatory's mission lifetime, and here we present a method of leveraging existing radio catalogs to examine these sources without the need for specific dedicated observations, which can be costly and complex. Via the inclusion of many sensitive low-frequency catalogs we specifically target steep spectrum sources such as pulsars. This work has found steep-spectrum radio sources contained inside 591 $\text{Fermi}$ unassociated fields, with at least 21 of them being notable for having pulsar-like $\gamma$-ray properties as well. We also identify a number of other fields of interest based on various radio and $\gamma$-ray selections.

arXiv comment13 pages, 5 figures, 3 tables, accepted for publication in ApJ

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• Chandra X-ray Observatory Observations of 13 Fermi LAT Sources
• Search for spatial coincidences between galaxy mergers and Fermi-LAT 4FGL-DR4 sources
• Exploring the nature of Galactic unassociated sources detected by the Fermi-LAT
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