A gamma-ray stacking survey of Fermi-LAT undetected globular clusters

ABSTRACT We present evidence for $\gamma$-ray emission from a stacked population of 39 high-latitude globular clusters (GCs) not detected in the Fermi Point Source Catalogue, likely attributable to populations of millisecond pulsars within them. In this work, we use 13 yr 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 $\gamma$-ray signal from background emission. The joint likelihood distribution of the GCs has a significant separation ($\sim 4\sigma$) 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.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2024-10-25
DOI
https://doi.org/10.1093/mnras/stae2402
Citations
2
Primary Topic
Geomagnetism and Paleomagnetism Studies
Type
article
Field-Weighted Citation Impact
0.47

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article

A gamma-ray stacking survey of Fermi-LAT undetected globular clusters

David Zurek, V. A. Pinto, Joshua Tan, Timothy A. D. Paglione et al.
2 citations
Monthly Notices of the Royal Astronomical Society
Geomagnetism and Paleomagnetism Studies
0.47
article

A gamma-ray stacking survey of Fermi-LAT undetected globular clusters

David Zurek, V. A. Pinto, Joshua Tan, Timothy A. D. Paglione, Owen K. Henry, Y. Song
article en
2 citations

Abstract

ABSTRACT We present evidence for $\gamma$-ray emission from a stacked population of 39 high-latitude globular clusters (GCs) not detected in the Fermi Point Source Catalogue, likely attributable to populations of millisecond pulsars within them. In this work, we use 13 yr 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 $\gamma$-ray signal from background emission. The joint likelihood distribution of the GCs has a significant separation ($\sim 4\sigma$) 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.

Monthly Notices of the Royal Astronomical SocietyVol. 535(1)
LaGuardia Community College (US), The Graduate Center, CUNY (US), American Museum of Natural History (US), York College, City University of New York (US), City University of New York (US), ARC Centre of Excellence for Gravitational Wave Discovery (AU), Max Planck Institute for Radio Astronomy (DE), Swinburne University of Technology (AU)
National Science Foundation, National Aeronautics and Space Administration, New York Space Grant Consortium, Nuclear Safety and Security Commission
Openalex Percentile: Top 34%
Geomagnetism and Paleomagnetism Studies
0.47
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