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Journal Article

Two Millisecond Pulsars Discovered by the PALFA Survey and a Shapiro Delay Measurement

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons40518

Allen,  B.
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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1208.1228
(Preprint), 4KB

ApJ_757_1_89.pdf
(Any fulltext), 593KB

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Citation

Deneva, J. S., Freire, P. C. C., Cordes, J. M., Lyne, A. G., Ransom, S. M., Cognard, I., et al. (2012). Two Millisecond Pulsars Discovered by the PALFA Survey and a Shapiro Delay Measurement. Astrophysical Journal, 757: 89. doi:10.1088/0004-637X/757/1/89.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000E-B319-4
Abstract
We present two millisecond pulsar discoveries from the PALFA survey of the Galactic plane with the Arecibo telescope. PSR J1955+2527 is an isolated pulsar with a period of 4.87 ms, and PSR J1949+3106 has a period of 13.14 ms and is in a 1.9-day binary system with a massive companion. Their timing solutions, based on 4 years of timing measurements with the Arecibo, Green Bank, Nan\c{c}ay and Jodrell Bank telescopes, allow precise determination of spin and astrometric parameters, including precise determinations of their proper motions. For PSR J1949+3106, we can clearly detect the Shapiro delay. From this we measure the pulsar mass to be 1.47(+0.43/-0.31) solar masses, the companion mass to be 0.85(+0.14/-0.11) solar masses and the orbital inclination to be i = 79.9(+1.6/-1.9) degrees, where uncertainties correspond to +/- 1-\sigma\ confidence levels. With continued timing, we expect to also be able to detect the advance of periastron for the J1949+3106 system. This effect, combined with the Shapiro delay, will eventually provide very precise mass measurements for this system and a test of general relativity.