Back to Search Start Over

A second chromatic timing event of interstellar origin toward PSR J1713+0747

Authors :
Renée Spiewak
Harsha Blumer
Megan E. DeCesar
Paul Demorest
Emmanuel Fonseca
J. E. Turner
Elizabeth C. Ferrara
Robert D. Ferdman
James M. Cordes
Sarah J. Vigeland
P. A. Gentile
Justin A. Ellis
Joseph K. Swiggum
Megan L. Jones
Timothy Dolch
Maura McLaughlin
Wenbai Zhu
Ryan S. Lynch
Gianfranco Grillo
Nathan Garver-Daniels
Ingrid H. Stairs
V. Gupta
Zaven Arzoumanian
Cherry Ng
Michael T. Lam
H. T. Cromartie
Duncan R. Lorimer
Daniel R. Stinebring
T. J. W. Lazio
Shami Chatterjee
Jeffrey S. Hazboun
Kevin Stovall
Paul R. Brook
David J. Nice
Timothy T. Pennucci
Scott M. Ransom
Dustin R. Madison
Publication Year :
2018

Abstract

The frequency dependence of radio pulse arrival times provides a probe of structures in the intervening media. Demorest et al. 2013 was the first to show a short-term (~100-200 days) reduction in the electron content along the line of sight to PSR J1713+0747 in data from 2008 (approximately MJD 54750) based on an apparent dip in the dispersion measure of the pulsar. We report on a similar event in 2016 (approximately MJD 57510), with average residual pulse-arrival times of approximately 3.0,-1.3, and -0.7 microseconds at 820, 1400, and 2300 MHz, respectively. Timing analyses indicate possible departures from the standard nu^-2 dispersive-delay dependence. We discuss and rule out a wide variety of potential interpretations. We find the likeliest scenario to be lensing of the radio emission by some structure in the interstellar medium, which causes multiple frequency-dependent pulse arrival-time delays.<br />9 pages, 3 figures, published in ApJ

Details

Language :
English
Database :
OpenAIRE
Accession number :
edsair.doi.dedup.....4109dfc4b366d369130172e2afeb17b9