J/MNRAS/485/3834 Phase diff. between QPO harmonics in BHXRB (De Ruiter+, 2019)
A systematic study of the phase difference between QPO harmonics in
black hole X-ray binaries.
De Ruiter I., Van Den Eijnden J., Ingram A., Uttley P.
<Mon. Not. R. Astron. Soc., 485, 3834-3844 (2019)>
=2019MNRAS.485.3834D 2019MNRAS.485.3834D (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, X-ray ; Black holes
Keywords: accretion, accretion discs - black hole physics - X-rays: binaries
Abstract:
We perform a systematic study of the evolution of the waveform of
black hole X-ray binary low-frequency QPOs, by measuring the phase
difference between their fundamental and harmonic features. This phase
difference has been studied previously for small number of QPO
frequencies in individual sources. Here, we present a sample study
spanning 14 sources and a wide range of QPO frequencies. With an
automated pipeline, we systematically fit power spectra and calculate
phase differences from archival Rossi X-ray Timing Explorer (RXTE)
observations. We measure well-defined phase differences over a large
range of QPO frequencies for most sources, demonstrating that a QPO
for a given source and frequency has a persistent underlying waveform.
This confirms the validity of recently developed spectral-timing
methods performing phase-resolved spectroscopy of the QPO.
Furthermore, we evaluate the phase difference as a function of QPO
frequency. For Type-B QPOs, we find that the phase difference stays
constant with frequency for most sources. We propose a simple jet
precession model to explain these constant Type-B QPO phase
differences. The phase difference of the Type-C QPO is not constant
but systematically evolves with QPO frequency, with the resulting
relation being similar for a number of high-inclination sources, but
more variable for low-inclination sources. We discuss how the evolving
phase difference can naturally arise in the framework of precession
models for the Type-C QPO, by considering the contributions of a
direct and reflected component to the QPO waveform.
Description:
For our analysis, we use the sample of Rossi X-ray Timing Explorer
(RXTE) observations compiled by Motta et al. (2015MNRAS.447.2059M 2015MNRAS.447.2059M,
Cat. J/MNRAS/447/2059) and further expanded and analysed in van den
Eijnden et al. (2017MNRAS.464.2643V 2017MNRAS.464.2643V). This sample contains 541
observations of 14 BHXRBs, of which 102 show Type-B and 439 show
Type-C QPOs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
sources.dat 65 12 List of black hole X-ray binaries
tablea1.dat 180 43 Phase differences between QPO fundamental and
harmonic signals for Type-B QPO analysis
tablea2.dat 180 254 Phase differences between QPO fundamental and
harmonic signals for Type-C QPO analysis
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See also:
J/MNRAS/447/2059 : Black hole binaries quasi-periodic oscillations
(Motta+, 2015)
Byte-by-byte Description of file: sources.dat
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Bytes Format Units Label Explanations
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1- 18 A18 --- Source Source name
21- 22 I2 h RAh Simbad right ascension (J2000)
24- 25 I2 min RAm Simbad right ascension (J2000)
27- 31 F5.2 s RAs Simbad right ascension (J2000)
33 A1 --- DE- Simbad declination sign (J2000)
34- 35 I2 deg DEd Simbad declination (J2000)
37- 38 I2 arcmin DEm Simbad declination (J2000)
40- 43 F4.1 arcsec DEs Simbad declination (J2000)
45- 54 A10 --- A1 Short name of the source in tablea1
56- 65 A10 --- A2 Short name of the source in tablea2
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Byte-by-byte Description of file: tablea?.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Short source name
12- 25 A14 --- ObsId Observation Id
27- 46 F20.18 --- A0 Variability amplitude of fundamental mode
48- 61 F14.12 Hz F0 Oscillation frequency of fundamental mode
63- 77 F15.13 --- FWHM0 FWHM of fundamental mode
79-100 E22.16 --- AH Variability amplitude of harmonic mode
102-116 F15.12 Hz FH Oscillation frequency of harmonic mode
118-134 E17.15 --- FWHMH FWHM of harmonic mode
136-156 F21.18 --- Phase Mean phase
158-173 F16.14 --- e_Phase Mean phase error
175-180 F6.4 --- Step Frequency step
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 28-Sep-2022