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A second chromatic timing event of interstellar origin toward PSR J1713+0747
- 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
- Subjects :
- High Energy Astrophysical Phenomena (astro-ph.HE)
Physics
Line-of-sight
010308 nuclear & particles physics
FOS: Physical sciences
Astronomy and Astrophysics
Electron
Astrophysics
01 natural sciences
Pulse (physics)
Interstellar medium
Pulsar
13. Climate action
Space and Planetary Science
0103 physical sciences
Dispersion (optics)
Chromatic scale
Astrophysics - High Energy Astrophysical Phenomena
010303 astronomy & astrophysics
Event (particle physics)
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....4109dfc4b366d369130172e2afeb17b9