2019MNRAS.485.4274H

Query : 2019MNRAS.485.4274H

2019MNRAS.485.4274H - Mon. Not. R. Astron. Soc., 485, 4274-4286 (2019/May-3)

A systematic study of soft X-ray pulse profiles of magnetars in quiescence.

HU C.-P., NG C.-Y. and HO W.C.G.

Abstract (from CDS):

Magnetars are neutron stars with extremely high surface magnetic fields. They show diverse X-ray pulse profiles in the quiescent state. We perform a systematic Fourier analysis of their soft X-ray pulse profiles. We find that most magnetars have a single-peaked profile and hence have low amplitudes of the second Fourier harmonics (A2). On the other hand, the pulsed fraction (PF) spreads over a wide range. We compared the results with theoretical profiles assuming various surface hotspot asymmetries, viewing geometries, and beaming functions. We found that a single value of the intensity ratio r between two antipodal hotspots is unable to reproduce the observed distribution of A2 and PF for all magnetars. The inferred r is probably anticorrelated with the thermal luminosity, implying that high-luminosity magnetars tend to have two symmetric hotspots. Our results are consistent with theoretical predictions, for which the existence of an evolving toroidal magnetic field breaks the symmetry of the surface temperature.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: magnetars - stars: neutron - pulsars: general - X-rays: stars

Simbad objects: 25

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Number of rows : 25
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 J0100-7211 Psr 01 00 42.86 -72 11 33.3   17.69 17.82     B3V 101 0
2 PSR J0146+6145 Psr 01 46 22.21 +61 45 03.8   28.100 25.620     ~ 613 0
3 NAME Sgr J0418+5729 gam 04 18 33.867 +57 32 22.91           ~ 244 0
4 PSR J0501+4516 Psr 05 01 06.600 +45 16 33.96           ~ 142 0
5 PSR B0525-66 Psr 05 26 00.7 -66 04 35           ~ 569 1
6 2E 2336 HXB 10 50 08.93 -59 53 19.9           Be 419 0
7 PSR J1119-6127 Psr 11 19 14.30 -61 27 49.5           ~ 439 1
8 PSR J1550-5418 Psr 15 50 54.18 -54 18 23.9           ~ 463 1
9 PSR J1622-4950 Psr 16 22 44.80000 -49 50 54.5000           ~ 169 0
10 GRB 980618A gB 16 35 52 -47 35.2           ~ 270 0
11 PSR J1647-4552 Psr 16 47 10.18 -45 52 16.7           ~ 217 1
12 PSR J1708-4008 Psr 17 08 46.1 -40 08 56           ~ 315 0
13 [AAB2008] 1 X 17 14 05.7 -38 10 31           ~ 69 1
14 PSR J1745-2900 Psr 17 45 40.1640 -29 00 29.818           ~ 358 0
15 PSR J1808-2024 Psr 18 08 39.32 -20 24 40.1           ~ 1316 2
16 AX J1809.8-1943 Psr 18 09 51.07 -19 43 51.8           ~ 532 0
17 1WGA J1822.2-1604 X 18 22 18.32 -16 04 27.2           ~ 141 0
18 NAME Sgr 1833-0832 gam 18 33 46.0 -08 32 13           ~ 87 0
19 PSR J1834-0845 Psr 18 34 52.1 -08 45 56           ~ 98 0
20 PSR J1841-0456 Psr 18 41 19.29 -04 56 11.4           ~ 296 1
21 PSR J1852+0040 Psr 18 52 38.5963516169 +00 40 20.164383034           ~ 98 1
22 PSR J1852+0033 Psr 18 52 46.60 +00 33 20.9           ~ 51 0
23 GBS 1900+14 gB 19 07 13 +09 19.6           ~ 906 0
24 NAME Sgr 1935+2154 * 19 34 55.68 +21 53 48.2           ~ 820 1
25 2E 4673 HXB 23 01 08.14 +58 52 44.5           ~ 673 1

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