2020A&A...643A.173D


Query : 2020A&A...643A.173D

2020A&A...643A.173D - Astronomy and Astrophysics, volume 643A, 173-173 (2020/11-1)

An observational argument against accretion in magnetars.

DOROSHENKO V., SANTANGELO A., SULEIMANOV V.F. and TSYGANKOV S.S.

Abstract (from CDS):

The phenomenology of anomalous X-ray pulsars is usually interpreted within the paradigm of very highly magnetized neutron stars, also known as magnetars. According to this paradigm, the persistent emission of anomalous X-ray pulsars (AXPs) is powered by the decay of the magnetic field. However, an alternative scenario in which the persistent emission is explained through accretion is also discussed in literature. In particular, AXP 4U 0142+61 has been suggested to be either an accreting neutron star or a white dwarf. Here, we rule out this scenario based on the observed X-ray variability properties of the source. We directly compare the observed power spectra of 4U 0142+61 and of two other magnetars, 1RXS J170849.0-400910 and 1E 1841-045 with that of the X-ray pulsar 1A 0535+262, and of the intermediate polar GK Persei. In addition, we include a bright young radio pulsar PSR B1509-58 for comparison. We show that, unlike accreting sources, no aperiodic variability within the expected frequency range is observed in the power density spectrum of the magnetars and the radio pulsar. Considering that strong variability is an established feature of all accreting systems from young stellar objects to super-massive black holes and the absence of the variability reports from other magnetars, we conclude that our results also indicate that magnetars, in general, are not powered by accretion.

Abstract Copyright: © ESO 2020

Journal keyword(s): pulsars: general - stars: magnetars - binaries: general

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 PSR J0146+6145 Psr 01 46 22.21 +61 45 03.8   28.100 25.620     ~ 572 0
2 V* GK Per No* 03 31 12.0098863320 +43 54 15.469951212   14.139 13.090 12.589   K1IV 935 0
3 V* X Per HXB 03 55 23.0777456088 +31 02 45.039836148 6.090 6.840 6.720     O9.5III 979 0
4 HD 245770 HXB 05 38 54.5748918624 +26 18 56.836952784 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 985 0
5 PSR B1509-58 Psr 15 13 55.52 -59 08 08.8     13.06     ~ 846 1
6 AJG 44 Psr 16 17 33.000 -51 02 00.00           ~ 512 3
7 2E 3623 X 16 17 36.30 -51 02 26.6           ~ 110 1
8 PSR J1708-4008 Psr 17 08 49.0 -40 09 10           ~ 293 0
9 PSR J1841-0456 Psr 18 41 19.29 -04 56 11.4           ~ 267 1

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