Kavli Affiliate: Lijing Shao
| First 5 Authors: Yujie Lian, Zhichen Pan, Haiyan Zhang, Shuo Cao, P. C. C. Freire
| Summary:
By January 2025, 60 pulsars were discovered by the Five-hundred-meter
Aperture Spherical radio Telescope globular cluster (GC) pulsar survey (GC
FANS), with spin periods spanning 1.98 ms to 3960.72 ms. Of these, 55 are
millisecond pulsars (MSPs; $P<30$ ms), while 34 are binaries with orbital
periods spanning 0.12 days to 466.47 days. This paper describes GC FANS, a
deep, thorough search for pulsars in 41 GCs in the FAST sky ($-14^circ <
delta < 65^circ$) and describes new discoveries in 14 of them. We present
updated timing solutions for M92A, NGC 6712A, M71A, and M71E, all of which are
“spider” pulsars with short orbital periods. We present new timing solutions
for M71B, C, and D. With orbital periods of $sim$466 and 378 days, M71B and
M71C are the widest known GC binaries; these systems resemble the normal wide
MSP-He WD systems in the Galactic disk. With a spin period of 101 ms, M71D is
in an eccentric ($esim$0.63) orbit with an 11-day period and a massive
companion; the system has a total mass of $2.63 pm 0.08 , M_{odot}$. These
features and its large characteristic age suggest it is a double neutron star
system (DNS) formed via massive binary evolution early in the cluster’s
history, akin to Galactic disk DNSs–unlike other candidate GC DNSs, which
typically form dynamically. A comparative analysis of GC pulsar populations
within FAST’s sky reveals that most clusters (10 of 14) resemble the Galactic
disk MSP population, likely due to lower stellar densities.
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