2018ApJ...861..132L

Query : 2018ApJ...861..132L

2018ApJ...861..132L - Astrophys. J., 861, 132-132 (2018/July-2)

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

LAM M.T., ELLIS J.A., GRILLO G., JONES M.L., HAZBOUN J.S., BROOK P.R., TURNER J.E., CHATTERJEE S., CORDES J.M., LAZIO T.J.W., DECESAR M.E., ARZOUMANIAN Z., BLUMER H., CROMARTIE H.T., DEMOREST P.B., DOLCH T., FERDMAN R.D., FERRARA E.C., FONSECA E., GARVER-DANIELS N., GENTILE P.A., GUPTA V., LORIMER D.R., LYNCH R.S., MADISON D.R., McLAUGHLIN M.A., NG C., NICE D.J., PENNUCCI T.T., RANSOM S.M., SPIEWAK R., STAIRS I.H., STINEBRING D.R., STOVALL K., SWIGGUM J.K., VIGELAND S.J. and ZHU W.W.

Abstract (from CDS):

The frequency dependence of radio pulse arrival times provides a probe of structures in the intervening media. Demorest et al. 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 ≃-3.0, -1.3, and -0.7 µs at 820, 1400, and 2300 MHz, respectively. Timing analyses indicate possible departures from the standard ν–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.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): pulsars: individual: PSR J1713+0747 - ISM: general

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PSR J1643-1224 Psr 16 43 38.16612 -12 24 58.6334           ~ 260 2
2 PSR J1713+0747 Psr 17 13 49.5367813 +07 47 37.450240           ~ 530 1
3 PSR J1738+0333 Psr 17 38 53.966386 +03 33 10.87200           ~ 191 1
4 PSR J1909-3744 Psr 19 09 47.42820 -37 44 14.7740           ~ 343 2

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