The Statistical Analysis of GeV Spectral Breaks in Bright Gamma-Ray Flat-spectrum Radio Quasars
| Autor: | K. R. Zhu, J. M. Chen, L. Zhang |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | The Astrophysical Journal Supplement Series, Vol 275, Iss 2, p 41 (2024) |
| Druh dokumentu: | article |
| ISSN: | 1538-4365 0067-0049 |
| DOI: | 10.3847/1538-4365/ad8639 |
| Popis: | We present the statistical results of GeV spectral breaks of bright gamma-ray flat-spectrum radio quasars (FSRQs) in the energy range of 0.1–10 GeV based on New Pass 8 data of the Large Area Telescope on board Fermi Gamma-Ray Space Telescope. We have fitted the 15 yr average gamma-ray spectra of 755 FSRQs by using both the broken power law (BPL) and logarithmic parabola (LP) models, and obtained 87 bright gamma-ray FSRQs with their integrated photon fluxes greater than 2.16 × 10 ^−8 cm ^−2 s ^−1 . From our results, the FSRQ population shows similar preferences for both the BPL and LP models in gamma-ray spectral fitting, and the clustering analysis suggests that BPL-preferred and LP-preferred FSRQs belong to the same category. Our results indicate that GeV spectral breaks in bright gamma-ray FSRQs are located at 2.90 ± 1.92 GeV in the rest frame, and the observed change in photon index is Δ γ = 0.45 ± 0.19, which is consistent with the expected value for a cooling break of electrons scattering seed photons. |
| Databáze: | Directory of Open Access Journals |
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