Evidence for Harmonic Relationships in the High-Frequency Quasi-periodic Oscillations of XTE J1550-564 and GRO J1655-40. Remillard, R. A., Muno, M. P., McClintock, J. E., & Orosz, J. A. The Astrophysical Journal, 580:1030–1042, December, 2002. ![Evidence for Harmonic Relationships in the High-Frequency Quasi-periodic Oscillations of XTE J1550-564 and GRO J1655-40 [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex We continue to investigate the X-ray properties of the black hole binary XTE J1550-564. By grouping observations (1998-1999) according to the type of low-frequency quasiperiodic oscillation (LFQPO) identified in a previous paper, we show evidence that two high-frequency QPOs (HFQPOs) occur simultaneously near 184 and 276 Hz. We can model the QPO profiles while assuming that the central frequencies are related by a 3:2 ratio. In one group, there is some evidence of a broad feature at the fundamental frequency of 92 Hz. We also investigate the 2000 April outburst, and we confirm the suggestion of Miller et al. that a 270 Hz QPO is accompanied by a second feature near 180 Hz. The histogram for the 28 individual HFQPO detections in XTE J1550-564 shows two peaks near 184 and 276 Hz, while there is a notable exception in the 143 Hz QPO detected on 1998 October 15. Similarly, all of the 13 HFQPO detections in the black hole binary GRO J1655-40 occur at two frequencies that are related by a 3:2 ratio. We next investigate all of the energy spectra for XTE J1550-564, and we find a systematic increase in the strength of the power-law component as the stronger of the two HFQPOs shifts from 276 to 184 Hz. A strikingly similar result is seen in the spectra of GRO J1655-40 when the stronger HFQPO shifts from 450 to 300 Hz. The fundamental HFQPO frequencies for the two X-ray sources scale as M-1, which is consistent with the hypotheses that these HFQPOs represent some kind of oscillation rooted in general relativity (GR) and that the two black holes have similar values of the dimensionless spin parameter. We discuss physical mechanisms that may explain these HFQPOs. A resonance between orbital and radial coordinate frequencies is one possibility suggested by Abramowicz & Kluzniak. For XTE J1550-564, this would imply moderate values for the dimensionless spin parameter (0.1*\textless0.6), with similar results for GRO J1655-40. A resonance between polar and radial coordinate frequencies allows additional values for a* above 0.9. There remain serious uncertainties regarding the physical mechanism whereby resonances in coordinate frequencies may produce HFQPOs. We also discuss models for ``diskoseismic'' oscillations. In this case, the concept that the inner disk behaves as a resonance cavity in GR has certain attractions for explaining HFQPOs, but integral harmonics are not predicted for the three types of diskoseismic modes derived for adiabatic perturbations in a thin accretion disk.
@article{remillardEvidenceHarmonicRelationships2002,
title = {Evidence for {Harmonic} {Relationships} in the {High}-{Frequency} {Quasi}-periodic {Oscillations} of {XTE} {J1550}-564 and {GRO} {J1655}-40},
volume = {580},
issn = {0004-637X},
url = {http://adsabs.harvard.edu/abs/2002ApJ...580.1030R},
doi = {10.1086/343791},
abstract = {We continue to investigate the X-ray properties of the black hole binary
XTE J1550-564. By grouping observations (1998-1999) according to the
type of low-frequency quasiperiodic oscillation (LFQPO) identified in a
previous paper, we show evidence that two high-frequency QPOs (HFQPOs)
occur simultaneously near 184 and 276 Hz. We can model the QPO profiles
while assuming that the central frequencies are related by a 3:2 ratio.
In one group, there is some evidence of a broad feature at the
fundamental frequency of 92 Hz. We also investigate the 2000 April
outburst, and we confirm the suggestion of Miller et al. that a 270 Hz
QPO is accompanied by a second feature near 180 Hz. The histogram for
the 28 individual HFQPO detections in XTE J1550-564 shows two peaks near
184 and 276 Hz, while there is a notable exception in the 143 Hz QPO
detected on 1998 October 15. Similarly, all of the 13 HFQPO detections
in the black hole binary GRO J1655-40 occur at two frequencies that are
related by a 3:2 ratio. We next investigate all of the energy spectra
for XTE J1550-564, and we find a systematic increase in the strength of
the power-law component as the stronger of the two HFQPOs shifts from
276 to 184 Hz. A strikingly similar result is seen in the spectra of GRO
J1655-40 when the stronger HFQPO shifts from 450 to 300 Hz. The
fundamental HFQPO frequencies for the two X-ray sources scale as
M-1, which is consistent with the hypotheses that these
HFQPOs represent some kind of oscillation rooted in general relativity
(GR) and that the two black holes have similar values of the
dimensionless spin parameter. We discuss physical mechanisms that may
explain these HFQPOs. A resonance between orbital and radial coordinate
frequencies is one possibility suggested by Abramowicz \& Kluzniak.
For XTE J1550-564, this would imply moderate values for the
dimensionless spin parameter (0.1*{\textless}0.6), with similar
results for GRO J1655-40. A resonance between polar and radial
coordinate frequencies allows additional values for a* above
0.9. There remain serious uncertainties regarding the physical mechanism
whereby resonances in coordinate frequencies may produce HFQPOs. We also
discuss models for ``diskoseismic'' oscillations. In this case, the
concept that the inner disk behaves as a resonance cavity in GR has
certain attractions for explaining HFQPOs, but integral harmonics are
not predicted for the three types of diskoseismic modes derived for
adiabatic perturbations in a thin accretion disk.},
urldate = {2021-01-18},
journal = {The Astrophysical Journal},
author = {Remillard, Ronald A. and Muno, Michael P. and McClintock, Jeffrey E. and Orosz, Jerome A.},
month = dec,
year = {2002},
keywords = {Black Hole Physics, Stars: Individual: Alphanumeric: GRO J1655-40, Stars: Individual: Alphanumeric: XTE J1550-564, Stars: Oscillations, X-Rays: Stars},
pages = {1030--1042},
}
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In one group, there is some evidence of a broad feature at the fundamental frequency of 92 Hz. We also investigate the 2000 April outburst, and we confirm the suggestion of Miller et al. that a 270 Hz QPO is accompanied by a second feature near 180 Hz. The histogram for the 28 individual HFQPO detections in XTE J1550-564 shows two peaks near 184 and 276 Hz, while there is a notable exception in the 143 Hz QPO detected on 1998 October 15. Similarly, all of the 13 HFQPO detections in the black hole binary GRO J1655-40 occur at two frequencies that are related by a 3:2 ratio. We next investigate all of the energy spectra for XTE J1550-564, and we find a systematic increase in the strength of the power-law component as the stronger of the two HFQPOs shifts from 276 to 184 Hz. A strikingly similar result is seen in the spectra of GRO J1655-40 when the stronger HFQPO shifts from 450 to 300 Hz. The fundamental HFQPO frequencies for the two X-ray sources scale as M-1, which is consistent with the hypotheses that these HFQPOs represent some kind of oscillation rooted in general relativity (GR) and that the two black holes have similar values of the dimensionless spin parameter. We discuss physical mechanisms that may explain these HFQPOs. A resonance between orbital and radial coordinate frequencies is one possibility suggested by Abramowicz & Kluzniak. For XTE J1550-564, this would imply moderate values for the dimensionless spin parameter (0.1*\\textless0.6), with similar results for GRO J1655-40. A resonance between polar and radial coordinate frequencies allows additional values for a* above 0.9. There remain serious uncertainties regarding the physical mechanism whereby resonances in coordinate frequencies may produce HFQPOs. We also discuss models for ``diskoseismic'' oscillations. In this case, the concept that the inner disk behaves as a resonance cavity in GR has certain attractions for explaining HFQPOs, but integral harmonics are not predicted for the three types of diskoseismic modes derived for adiabatic perturbations in a thin accretion disk.","urldate":"2021-01-18","journal":"The Astrophysical Journal","author":[{"propositions":[],"lastnames":["Remillard"],"firstnames":["Ronald","A."],"suffixes":[]},{"propositions":[],"lastnames":["Muno"],"firstnames":["Michael","P."],"suffixes":[]},{"propositions":[],"lastnames":["McClintock"],"firstnames":["Jeffrey","E."],"suffixes":[]},{"propositions":[],"lastnames":["Orosz"],"firstnames":["Jerome","A."],"suffixes":[]}],"month":"December","year":"2002","keywords":"Black Hole Physics, Stars: Individual: Alphanumeric: GRO J1655-40, Stars: Individual: Alphanumeric: XTE J1550-564, Stars: Oscillations, X-Rays: Stars","pages":"1030–1042","bibtex":"@article{remillardEvidenceHarmonicRelationships2002,\n\ttitle = {Evidence for {Harmonic} {Relationships} in the {High}-{Frequency} {Quasi}-periodic {Oscillations} of {XTE} {J1550}-564 and {GRO} {J1655}-40},\n\tvolume = {580},\n\tissn = {0004-637X},\n\turl = {http://adsabs.harvard.edu/abs/2002ApJ...580.1030R},\n\tdoi = {10.1086/343791},\n\tabstract = {We continue to investigate the X-ray properties of the black hole binary \nXTE J1550-564. By grouping observations (1998-1999) according to the\ntype of low-frequency quasiperiodic oscillation (LFQPO) identified in a\nprevious paper, we show evidence that two high-frequency QPOs (HFQPOs)\noccur simultaneously near 184 and 276 Hz. We can model the QPO profiles\nwhile assuming that the central frequencies are related by a 3:2 ratio.\nIn one group, there is some evidence of a broad feature at the\nfundamental frequency of 92 Hz. We also investigate the 2000 April\noutburst, and we confirm the suggestion of Miller et al. that a 270 Hz\nQPO is accompanied by a second feature near 180 Hz. The histogram for\nthe 28 individual HFQPO detections in XTE J1550-564 shows two peaks near\n184 and 276 Hz, while there is a notable exception in the 143 Hz QPO\ndetected on 1998 October 15. Similarly, all of the 13 HFQPO detections\nin the black hole binary GRO J1655-40 occur at two frequencies that are\nrelated by a 3:2 ratio. We next investigate all of the energy spectra\nfor XTE J1550-564, and we find a systematic increase in the strength of\nthe power-law component as the stronger of the two HFQPOs shifts from\n276 to 184 Hz. A strikingly similar result is seen in the spectra of GRO\nJ1655-40 when the stronger HFQPO shifts from 450 to 300 Hz. The\nfundamental HFQPO frequencies for the two X-ray sources scale as\nM-1, which is consistent with the hypotheses that these\nHFQPOs represent some kind of oscillation rooted in general relativity\n(GR) and that the two black holes have similar values of the\ndimensionless spin parameter. We discuss physical mechanisms that may\nexplain these HFQPOs. A resonance between orbital and radial coordinate\nfrequencies is one possibility suggested by Abramowicz \\& Kluzniak.\nFor XTE J1550-564, this would imply moderate values for the\ndimensionless spin parameter (0.1*{\\textless}0.6), with similar\nresults for GRO J1655-40. 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