P. S. Ray, S. M. Ransom, C. C. Cheung, M. Giroletti, I. Cognard, F. Camilo, B. Bhattacharyya, J. Roy, R. W. Romani, E. C. Ferrara, L. Guillemot, S. Johnston, M. Keith, M. Kerr, M. Kramer, H. J. Pletsch, P. M. Saz Parkinson, K. S. Wood
We report the detection of radio emission from PSR J1311-3430, the first millisecond pulsar discovered in a blind search of Fermi Large Area Telescope (LAT) gamma-ray data. We detected radio pulsations at 2 GHz, visible for <10% of ~4.5-hrs of observations using the Green Bank Telescope (GBT). Observations at 5 GHz with the GBT and at several lower frequencies with Parkes, Nancay, and the Giant Metrewave Radio Telescope resulted in non-detections. We also report the faint detection of a steep spectrum continuum radio source (0.1 mJy at 5 GHz) in interferometric imaging observations with the Jansky Very Large Array. These detections demonstrate that PSR J1311-3430, is not radio quiet and provides additional evidence that the radio beaming fraction of millisecond pulsars is very large. The radio detection yields a distance estimate of 1.4 kpc for the system, yielding a gamma-ray efficiency of 30%, typical of LAT-detected MSPs. We see apparent excess delay in the radio pulsar as the pulsar appears from eclipses and we speculate on possible mechanisms for the non-detections of the pulse at other orbital phases and observing frequencies.
View original:
http://arxiv.org/abs/1210.6676
No comments:
Post a Comment