2021ApJ...907..111Z

Query : 2021ApJ...907..111Z

2021ApJ...907..111Z - Astrophys. J., 907, 111-111 (2021/February-1)

Dispersion and rotation measures from the ejecta of compact binary mergers: clue to the progenitors of fast radio bursts.

ZHAO Z.Y., ZHANG G.Q., WANG Y.Y., TU Z.-L. and WANG F.Y.

Abstract (from CDS):

Since the discovery of FRB 200428 associated with the Galactic SGR 1935+2154, magnetars have been considered to power fast radio bursts (FRBs). It is widely believed that magnetars could form by core-collapse (CC) explosions and compact binary mergers, such as binary neutron stars (BNSs), binary white dwarfs (BWDs), and neutron star-white dwarf (NSWD) mergers. Therefore, it is important to distinguish the various progenitors. The expansion of the merger ejecta produces a time-evolving dispersion measure (DM) and rotation measure (RM) that can probe the local environments of FRBs. In this paper, we derive the scaling laws for the DM and RM from ejecta with different dynamical structures (the mass and energy distribution) in the uniform ambient medium (merger scenario) and wind environment (CC scenario). We find that the DM and RM will increase in the early phase, while DM will continue to grow slowly but RM will decrease in the later phase in the merger scenario. We fit the DM and RM evolution of FRB 121102 simultaneously for the first time in the BNS merger scenario and find that the source age is ∼9-10 yr when it was first detected in 2012, and the ambient medium density is ∼2.5-3.1 cm–3. The large offsets of some FRBs are consistent with the BNS/NSWD channel. The population synthesis method is used to estimate the rate of compact binary mergers. The rate of BWD mergers is close to the observed FRB rate. Therefore, the progenitors of FRBs may not be unique.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Radio bursts - Radio transient sources - Magnetars

Simbad objects: 19

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Number of rows : 19
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 FRB 20180916B rB 01 58 00.750 +65 43 00.30           ~ 457 0
2 FRB 20181119D rB 05 31 58.6980 +33 08 52.588           ~ 933 0
3 FRB 180301 rB 06 12 43.40 +04 33 44.8           ~ 125 0
4 SN 1993J SN* 09 55 24.77476 +69 01 13.7026   10.8 12.0     SNIIb 1507 1
5 FRB 190714 rB 12 15 55.1 -13 01 16           ~ 64 0
6 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 2683 0
7 FRB 190523 rB 13 48 15.6 +72 28 11           ~ 109 0
8 FRB 200430 rB 15 18 49.54 +12 22 36.8           ~ 59 0
9 NAME Sgr 1935+2154 * 19 34 55.68 +21 53 48.2           ~ 820 1
10 FRB 200428 rB 19 35.0 +21 57           ~ 291 0
11 SNR G057.2+00.8 SNR 19 35.0 +21 57           ~ 119 0
12 FRB 190611 rB 21 22 58.91 -79 23 51.3           ~ 82 0
13 FRB 190102 rB 21 29 39.76 -79 28 32.5           ~ 83 0
14 FRB 191001 rB 21 33 24.373 -54 44 51.40           ~ 64 0
15 FRB 180924 rB 21 44 25.255 -40 54 00.10           ~ 140 0
16 FRB 181112 rB 21 49 23.630 -52 58 15.39           ~ 131 0
17 FRB 20190711A rB 21 57 40.7 -80 21 29           ~ 114 0
18 FRB 190608 rB 22 16 04.74 -07 53 53.6           ~ 102 0
19 NAME Cas A SNR 23 23 26.0 +58 48 41     14.30     ~ 3033 1

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