Testing the Sensitivity of the Galactic Center Excess to the Point Source Mask.
| Autor: | Zhong YM; Kavli Institute for Cosmological Physics, University of Chicago, Chicago, Illinois 60637, USA., McDermott SD; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA., Cholis I; Department of Physics, Oakland University, Rochester, Michigan 48326, USA., Fox PJ; Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA. |
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| Jazyk: | angličtina |
| Zdroj: | Physical review letters [Phys Rev Lett] 2020 Jun 12; Vol. 124 (23), pp. 231103. |
| DOI: | 10.1103/PhysRevLett.124.231103 |
| Abstrakt: | The Fermi Large Area Telescope (Fermi-LAT) Collaboration has an updated point source catalog, referred to as 4FGL. We perform the first template fit using a mask based on this new catalog and find that the excess in gamma rays detected at the Galactic Center in Fermi-LAT data persists. On the other hand, we find that a search for point sources is highly sensitive to the use of the 4FGL catalog: no sizable excess of bright pixels is apparent in the inner Galaxy when we mask out 4FGL point sources. Combining these observations restricts the ability of point sources to contribute to the Galactic Center excess. After identifying which bright sources have no known counterpart, we place strong constraints on any point source luminosity function capable of explaining the smooth emission identified in the template fit. |
| Databáze: | MEDLINE |
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