Discovery of PSR J1907+0918

Details Discovery of PSR J1907+0918 Discovery of PSR J1907+0918

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.4106x&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #41.06; Bulletin of the American Astronomical Society, Vol. 30, p.1309

Astronomy and Astrophysics

Astronomy

Scientific paper

We have observed the soft gamma-ray repeater SGR 1900+14 with the Arecibo telescope for seven days after the source became active again in June 1998. A search for pulsed radio emission at 0.43 and 1.4 GHz did not reveal the 5.16 s period reported for SGR 1900+14. Based on our original and follow up observations we place an upper flux density limit of 150 mu Jy. We are presently trying to improve this limit by incoherently stacking power spectra. During our search we have discovered a 226-ms radio pulsar, PSR J1907+0918. Deep imaging with the VLA lead to the identification of the pulsar with a 0.2 mJy source at R.A.=19(h}07({m}22^{s)) .37, Decl =+9(deg}18({'}27^{'')) .03 (equinox 2000.0). The Arecibo observations of PSR J1907+0918 show that it has a relatively flat spectrum with a spectral index of > -1. At 1.4 GHz the mean flux density is ~ 0.3 mJy. The pulsar appears to scintillate showing a flux variability of about 17% in time-scales of one hour. The pulse profile at high frequencies has a duty cycle of 2.0% - somewhat narrower than most pulsars of this type. Measurements of the pulse period over a 120-day baseline give a period derivative of (1+/- 2) x 10(-13) s/s (3sigma upper limit). Preliminary timing observations at L and S-band suggest a dispersion measure of 400+/-5 pc cm(-3) indicating a distance ~ 8 kpc. This is the first pulsar to be discovered with the recently upgraded Arecibo telescope at L-band. This serendipitous discovery suggests that high frequency observations can potentially reveal many more flat spectrum low luminosity objects, along highly dispersive areas such as the spiral arms of our Galaxy.

Affiliated with

Also associated with

No associations

Rating

Discovery of PSR J1907+0918 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Discovery of PSR J1907+0918, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Discovery of PSR J1907+0918 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-994143