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

被引：0
|
作者：
Henry, Owen K. [1 ,2 ]
Paglione, Timothy A. D. [1 ,2 ,3 ]
Song, Yuzhe [4 ,5 ]
Tan, Joshua [2 ,6 ]
Zurek, David [2 ]
Pinto, Vanessa [7 ]
机构：
[1] CUNY, Grad Ctr, Dept Phys, 365 Fifth Ave, New York, NY 10016 USA
[2] Amer Museum Nat Hist, Dept Astrophys, Cent Pk West & 79th St, New York, NY 10024 USA
[3] CUNY, York Coll, Dept Earth & Phys Sci, 94-20 Guy R Brewer Blvd, Jamaica, NY 11451 USA
[4] Swinburne Univ Technol, Ctr Astrophys & Supercomp, John St, Hawthorn, Vic 3122, Australia
[5] Swinburne Univ Technol, ARC Ctr Excellence Gravitat Wave Discovery, OzGrav, Level 9 AMDC Bldg,John St, Hawthorn, Vic 3122, Australia
[6] CUNY, LaGuardia Community Coll, Dept Nat Sci, 31-10 Thomson Ave, Long Isl City, NY 11101 USA
[7] Max Planck Inst Radio Astron, Hugel 69, D-53121 Bonn, Germany
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2024年 / 535卷 / 01期
基金：
美国国家科学基金会;
关键词：
pulsars: general; globular clusters: general; gamma-rays: general; MILLISECOND PULSARS; EMISSION; BLAZARS; MATTER; PULSATIONS; GALAXIES; SPECTRA; BAND;
D O I：
10.1093/mnras/stae2402
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 (similar to 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
引用
收藏
页码：434 / 442
页数：9
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