Timing the Geminga Pulsar with High-Energy Gamma-Rays

Details Timing the Geminga Pulsar with High-Energy Gamma-Rays Timing the Geminga Pulsar with High-Energy Gamma-Rays

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997stin...9723364h&link_type=abstract

Technical Report, Columbia Univ. New York, NY United States Columbia Astrophysics Lab.

Astronomy and Astrophysics

Astrophysics

Pulsars, Ephemerides, Gamma Rays, Stellar Rotation, Gamma Ray Astronomy, Gamma Ray Observatory, Stellar Mass, Ephemeris Time, Gamma Ray Telescopes, Astrophysics

Scientific paper

This is a continuing program to extend and refine the ephemeris of the Geminga pulsar with annual observations for the remaining lifetime of EGRET. The data show that every revolution of Geminga is accounted for during the EGRET epoch, and that a coherent timing solution linking the phase between EGRET, COS-B, amd SAS-2, observations has now been achieved. The accuracy of the gamma-ray timing is such that the proper motion of the pulsar can now be detected, consistent with the optical determination. The measured braking index over the 24.2 yr baseline is 17 +/- 1. Further observation is required to ascertain whether this very large braking index truly represents the energy loss mechanism, perhaps related to the theory in which Geminga is near its gamma-ray death line, or whether it is a manifestation of timing noise. Statistically significant timing residuals are detected in the EGRET data; they depart from the cubic ephemeris at a level of 23 milliperiods. The residuals appear to have a sinusoidal modulation with a period of about 5.1 yr. This could simply be a manifestation of timing noise, or it could be consistent with a planet of mass 1.7/sin i solar mass orbiting Geminga at a radius of 3.3/sin i AU.

Affiliated with

Also associated with

No associations

Rating

Timing the Geminga Pulsar with High-Energy Gamma-Rays 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 Timing the Geminga Pulsar with High-Energy Gamma-Rays, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Timing the Geminga Pulsar with High-Energy Gamma-Rays will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1147742