A Search for Millisecond Pulsars at Galactic Latitudes -50 degrees < B < -20 degrees

Details A Search for Millisecond Pulsars at Galactic Latitudes -50 degrees < B < -20 degrees A Search for Millisecond Pulsars at Galactic Latitudes -50 degrees < B < -20 degrees

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...461..812c&link_type=abstract

Astrophysical Journal v.461, p.812

Astronomy and Astrophysics

Astronomy

46

Stars: Binaries: Close, Gravitation, Stars: Pulsars: General, Surveys

Scientific paper

We have detected 12 new pulsars, including four of the short-period "recycled" variety, in a survey using the Arecibo radio telescope at 430 MHz. The survey covered 680 square degrees at right ascensions 21h through 02h, declinations +7 through + 30°. Most of the region falls between Galactic latitudes -20° and -50°. The minimum detectable flux density for long-period pulsars was approximately 0.5 mJy for declinations +14° < σ < + 23°, rising to 0.7 mJy at the declination extremes. For periods P < 100 ms the minimum detectable flux density increased with decreasing period, especially for large dispersion measures; at P = 1.5 ms and DM = 10 cm-3 pc the detection threshold was about 10 mJy. Only one previously known pulsar lay within the search region, and it was detected easily.
The newly discovered short-period pulsars include two isolated objects: PSR J2322+2057 (P = 4.81 ms, DM = 13 cm-3 pc), and PSR J2235+1506 (P = 59:8 ms, DM = 18 cm-3 pc); and two pulsars in nearly circular binary orbits: PSR J2229+2643 (P = 2.98 ms, DM = 23 cm-3 pc, orbital period Pb = 93d), and PSR J2317+1439 (P = 3.45 ms, DM = 22 cm-3 pc, Pb = 2.d5) We present timing observations of three of these pulsars over 1.5-2.5 yr. Refined and extended data sets for PSRs J2235+1506 and J2317+1439 have allowed the first measurements of their proper motions, which imply velocities of (100±40) km s-1 and (70±30) km s-1, respectively. Timing measurements of PSR J2229+2643 show that it has the smallest period derivative of any known pulsar, Pdot = (1.9±0.2) x 10-21. We use this result to establish a new upper limit for the possible rate of change of the Newtonian constant of gravity, |Gdot/G| < 3 x 10-11 yr-1.

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