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PSR J1909-3744: A Binary Millisecond Pulsar with a Very Small Duty Cycle


Jacoby, BA and Bailes, M and van Kerkwijk, MH and Ord, S and Hotan, AW and Kulkarni, SR and Anderson, SB, PSR J1909-3744: A Binary Millisecond Pulsar with a Very Small Duty Cycle, The Astrophysical Journal, 599, (2 II) pp. L99-L102. ISSN 0004-637X (2003) [Refereed Article]

DOI: doi:10.1086/381260


We report the discovery of PSR J1909-3744, a 2.95 ms pulsar in a nearly circular 1.53 day orbit. Its narrow pulse width of 43 μs allows pulse anival times to be determined with great accuracy. We have spectroscopically identified the companion as a moderately hot (7 ≈ 8500 K) white dwarf with strong absorption lines. Radial velocity measurements of the companion will yield the mass ratio of the system. Our timing data suggest the presence of Shapiro delay; we expect that further timing observations, combined with the mass ratio, will allow the first accurate determination of a millisecond pulsar mass. We have measured the timing parallax and proper motion for this pulsar, which indicate a transverse velocity of 140-40 -80 km s-1. This pulsar's stunningly narrow pulse profile makes it an excellent candidate for precision timing experiments that attempt to detect low-frequency gravitational waves from coalescing supermassive black hole binaries.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Hotan, AW (Dr Aidan Hotan)
ID Code:45142
Year Published:2003
Web of Science® Times Cited:46
Deposited By:Physics
Deposited On:2007-07-03
Last Modified:2007-07-03

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