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A Massive Neutron Star in the Globular Cluster M5
Paulo C. C. Freire, Alex Wolszczan, Maureen van den Berg +1
We report the results of 19 years of Arecibo timing for two pulsars in the globular cluster NGC 5904 (M5), PSR B1516+02A (M5A) and PSR B1516+02B (M5B). This has resulted in the mea…
Super-Massive Neutron Stars
Paulo C. C. Freire
We present here the results of Arecibo timing of PSR B1516+02B, a 7.95-ms pulsar in a binary system with a ~0.17 solar mass companion and an orbital period of 6.85 days located in…
The Eccentric Binary Millisecond Pulsar in NGC 1851
Paulo C. C. Freire, Scott M. Ransom, Yashwant Gupta
PSR J0514-4002A is a 5-ms pulsar is located in the globular cluster NGC 1851; it belongs to a highly eccentric (e = 0.888) binary system. It is one of the earliest known examples o…
PSR J1738+0333: a new gravitational laboratory
Paulo C. C. Freire, Bryan A. Jacoby, Matthew Bailes
We describe in this paper a new binary millisecond pulsar, PSR J1738+0333. Using Arecibo, we have achieved good timing accuracy for this object, about 220 ns for 1-hour integration…
Eight New Millisecond Pulsars in NGC 6440 and NGC 6441
Paulo C. C. Freire, Scott M. Ransom, Steve Begin +4
Motivated by the recent discovery of 30 new millisecond pulsars in Terzan 5, made using the Green Bank Telescope's S-band receiver and the Pulsar Spigot spectrometer, we have set o…
A 1.4-GHz Arecibo Survey for Pulsars in Globular Clusters
J. W. T. Hessels, S. M. Ransom, I. H. Stairs +2
We have surveyed all 22 known Galactic globular clusters observable with the Arecibo radio telescope and within 70kpc of the Sun for radio pulsations at ~1.4GHz. Data were taken wi…