GBT Discovery of Two Binary Millisecond Pulsars in the Globular Cluster M30

Details GBT Discovery of Two Binary Millisecond Pulsars in the Globular Cluster M30 GBT Discovery of Two Binary Millisecond Pulsars in the Globular Cluster M30

2003-10-14

arxiv.org/abs/astro-ph/0310347v2

Astrophys.J. 604 (2004) 328-338

Astronomy and Astrophysics

Astrophysics

10 pages, 6 figures, Submitted to ApJ. This version includes many recommended modifications, an improved structure, a new auth

Scientific paper

10.1086/381730

We report the discovery of two binary millisecond pulsars in the core-collapsed globular cluster M30 using the Green Bank Telescope (GBT) at 20 cm. PSR J2140-2310A (M30A) is an eclipsing 11-ms pulsar in a 4-hr circular orbit and PSR J2140-23B (M30B) is a 13-ms pulsar in an as yet undetermined but most likely highly eccentric (e>0.5) and relativistic orbit. Timing observations of M30A with a 20-month baseline have provided precise determinations of the pulsar's position (within 4" of the optical centroid of the cluster), and spin and orbital parameters, which constrain the mass of the companion star to be m_2 >~ 0.1Msun. The position of M30A is coincident with a possible thermal X-ray point source found in archival Chandra data which is most likely due to emission from hot polar caps on the neutron star. In addition, there is a faint (V_555 ~ 23.8) star visible in archival HST F555W data that may be the companion to the pulsar. Eclipses of the pulsed radio emission from M30A by the ionized wind from the compact companion star show a frequency dependent duration (\propto\nu^{-\alpha} with \alpha ~ 0.4-0.5) and delay the pulse arrival times near eclipse ingress and egress by up to 2-3 ms. Future observations of M30 may allow both the measurement of post-Keplerian orbital parameters from M30B and the detection of new pulsars due to the effects of strong diffractive scintillation.

Affiliated with

Also associated with

No associations

Rating

GBT Discovery of Two Binary Millisecond Pulsars in the Globular Cluster M30 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 GBT Discovery of Two Binary Millisecond Pulsars in the Globular Cluster M30, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GBT Discovery of Two Binary Millisecond Pulsars in the Globular Cluster M30 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-428011