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Title: Dispersion Measure Variation of Repeating Fast Radio Burst Sources

Abstract

The repeating fast radio burst (FRB) 121102 was recently localized in a dwarf galaxy at a cosmological distance. The dispersion measure (DM) derived for each burst from FRB 121102 so far has not shown significant evolution, even though an apparent increase was recently seen with newly detected VLA bursts. It is expected that more repeating FRB sources may be detected in the future. In this work, we investigate a list of possible astrophysical processes that might cause DM variation of a particular FRB source. The processes include (1) cosmological scale effects such as Hubble expansion and large-scale structure fluctuations; (2) FRB local effects such as gas density fluctuation, expansion of a supernova remnant (SNR), a pulsar wind nebula, and an H ii region; and (3) the propagation effect due to plasma lensing. We find that the DM variations contributed by the large-scale structure are extremely small, and any observable DM variation is likely caused by the plasma local to the FRB source. In addition to mechanisms that decrease DM over time, we suggest that an FRB source in an expanding SNR around a nearly neutral ambient medium during the deceleration (Sedov–Taylor and snowplow) phases or in a growing H iimore » region can increase DM. Some effects (e.g., an FRB source moving in an H ii region or plasma lensing) can produce either positive or negative DM variations. Future observations of DM variations of FRB 121102 and other repeating FRB sources can provide important clues regarding the physical origin of these sources.« less

Authors:
;  [1]
  1. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871 (China)
Publication Date:
OSTI Identifier:
22679837
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 847; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ASTROPHYSICS; DENSITY; DISPERSIONS; ELECTROMAGNETIC LENSES; EXPANSION; FLUCTUATIONS; GALAXIES; NEBULAE; PLASMA; PULSARS; SOLAR RADIO BURSTS; STELLAR WINDS; SUPERNOVA REMNANTS

Citation Formats

Yang, Yuan-Pei, and Zhang, Bing, E-mail: yypspore@gmail.com, E-mail: zhang@physics.unlv.edu. Dispersion Measure Variation of Repeating Fast Radio Burst Sources. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA8721.
Yang, Yuan-Pei, & Zhang, Bing, E-mail: yypspore@gmail.com, E-mail: zhang@physics.unlv.edu. Dispersion Measure Variation of Repeating Fast Radio Burst Sources. United States. doi:10.3847/1538-4357/AA8721.
Yang, Yuan-Pei, and Zhang, Bing, E-mail: yypspore@gmail.com, E-mail: zhang@physics.unlv.edu. Wed . "Dispersion Measure Variation of Repeating Fast Radio Burst Sources". United States. doi:10.3847/1538-4357/AA8721.
@article{osti_22679837,
title = {Dispersion Measure Variation of Repeating Fast Radio Burst Sources},
author = {Yang, Yuan-Pei and Zhang, Bing, E-mail: yypspore@gmail.com, E-mail: zhang@physics.unlv.edu},
abstractNote = {The repeating fast radio burst (FRB) 121102 was recently localized in a dwarf galaxy at a cosmological distance. The dispersion measure (DM) derived for each burst from FRB 121102 so far has not shown significant evolution, even though an apparent increase was recently seen with newly detected VLA bursts. It is expected that more repeating FRB sources may be detected in the future. In this work, we investigate a list of possible astrophysical processes that might cause DM variation of a particular FRB source. The processes include (1) cosmological scale effects such as Hubble expansion and large-scale structure fluctuations; (2) FRB local effects such as gas density fluctuation, expansion of a supernova remnant (SNR), a pulsar wind nebula, and an H ii region; and (3) the propagation effect due to plasma lensing. We find that the DM variations contributed by the large-scale structure are extremely small, and any observable DM variation is likely caused by the plasma local to the FRB source. In addition to mechanisms that decrease DM over time, we suggest that an FRB source in an expanding SNR around a nearly neutral ambient medium during the deceleration (Sedov–Taylor and snowplow) phases or in a growing H ii region can increase DM. Some effects (e.g., an FRB source moving in an H ii region or plasma lensing) can produce either positive or negative DM variations. Future observations of DM variations of FRB 121102 and other repeating FRB sources can provide important clues regarding the physical origin of these sources.},
doi = {10.3847/1538-4357/AA8721},
journal = {Astrophysical Journal},
number = 1,
volume = 847,
place = {United States},
year = {Wed Sep 20 00:00:00 EDT 2017},
month = {Wed Sep 20 00:00:00 EDT 2017}
}