A Gamma-ray Stacking Survey of Fermi-LAT Undetected Globular Clusters
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913548963151872 |
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| author | Henry, Owen K. Paglione, Timothy A. D. Song, Yuzhe Tan, Joshua Zurek, David Pinto, Vanessa |
| author_facet | Henry, Owen K. Paglione, Timothy A. D. Song, Yuzhe Tan, Joshua Zurek, David Pinto, Vanessa |
| contents | We present evidence for $γ$-ray emission from a stacked population of 39 high-latitude globular clusters (GCs) not detected in the Fermi Point Source Catalog, likely attributable to populations of millisecond pulsars within them. In this work, we use 13 years of data collected by the Large Area Telescope aboard the Fermi Gamma-Ray Space Telescope to search for a cumulative signal from undetected GCs and compared them to control fields (CFs), selected to match the celestial distribution of the target clusters so as to distinguish the $γ$-ray signal from background emission. The joint likelihood distribution of the GCs has a significant separation ($\sim4σ$) from that of the CFs. We also investigate correlations between detected cluster luminosities and other cluster properties such as distance, the number of millisecond pulsars associated with each cluster, and stellar encounter rate but find no significant relationships. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_12711 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Gamma-ray Stacking Survey of Fermi-LAT Undetected Globular Clusters Henry, Owen K. Paglione, Timothy A. D. Song, Yuzhe Tan, Joshua Zurek, David Pinto, Vanessa High Energy Astrophysical Phenomena We present evidence for $γ$-ray emission from a stacked population of 39 high-latitude globular clusters (GCs) not detected in the Fermi Point Source Catalog, likely attributable to populations of millisecond pulsars within them. In this work, we use 13 years of data collected by the Large Area Telescope aboard the Fermi Gamma-Ray Space Telescope to search for a cumulative signal from undetected GCs and compared them to control fields (CFs), selected to match the celestial distribution of the target clusters so as to distinguish the $γ$-ray signal from background emission. The joint likelihood distribution of the GCs has a significant separation ($\sim4σ$) from that of the CFs. We also investigate correlations between detected cluster luminosities and other cluster properties such as distance, the number of millisecond pulsars associated with each cluster, and stellar encounter rate but find no significant relationships. |
| title | A Gamma-ray Stacking Survey of Fermi-LAT Undetected Globular Clusters |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2410.12711 |