2018MNRAS.479..426V


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.23CET21:31:41

2018MNRAS.479..426V - Mon. Not. R. Astron. Soc., 479, 426-434 (2018/September-1)

The highest frequency kHz QPOs in neutron star low-mass X-ray binaries.

VAN DOESBURGH M., VAN DER KLIS M. and MORSINK S.M.

Abstract (from CDS):

We investigate the detections with RXTE of the highest frequency kHz Quasi-periodic oscillations (QPOs) previously reported in six neutron star (NS) low-mass X-ray binaries. We find that the highest frequency kHz QPO detected in 4U 0614+09 has a 1267 Hz 3σ confidence lower limit on its centroid frequency. This is the highest such limit reported to date and of direct physical interest as it can be used to constrain QPO models and the supranuclear density equation of state (EoS). We compare our measured frequencies to maximum orbital frequencies predicted in full GR using models of rotating NSs with a number of different modern EoS and show that these can accommodate the observed QPO frequencies. Orbital motion constrained by NS and ISCO radii is therefore a viable explanation of these QPOs. In the most constraining case of 4U 0614+09, we find the NS mass must be M < 2.1 M. From our measured QPO frequencies, we can constrain the NS radii for five of the six sources we studied to narrow ranges (±0.1-0.7 km) different for each source and each EoS.

Abstract Copyright: © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): accretion, accretion discs - equation of state - stars: neutron - X-rays: binaries

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 PSR J0348+0432 Psr 03 48 43.6365407296 +04 32 11.460202882           ~ 135 1
2 V* V1055 Ori LXB 06 17 07.3 +09 08 13   18.80 18.5     ~ 505 1
3 4U 1246-58 LXB 12 49 39.364 -59 05 14.68   19.24 18.99     ~ 77 0
4 V* V801 Ara LXB 16 40 55.5 -53 45 05 17.50 18.20 17.5     ~ 780 1
5 X Ara X-1 LXB 17 06 15.314 -43 02 08.69           ~ 234 1
6 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5           ~ 753 1
7 SAX J1750.8-2900 LXB 17 50 24.42 -29 02 15.4           ~ 127 0
8 V* V4580 Sgr LXB 18 08 27.54 -36 58 44.3   16.81 16.51     ~ 862 0

    Equat.    Gal    SGal    Ecl

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2020.02.23-21:31:41

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