Evidence for a 2:3 resonance in Sco X-1 kHz QPOs. Abramowicz, M. A., Bulik, T., Bursa, M., & Kluźniak, W. Astronomy and Astrophysics, 404:L21–L24, June, 2003.
Evidence for a 2:3 resonance in Sco X-1 kHz QPOs [link]Paper  doi  abstract   bibtex   
We find evidence that the two high frequency QPOs in Sco X-1 are, more often than not, approximately in the 2:3 frequency ratio familiar from studies of black hole candidates (e.g., XTE J1550-564, Remillard et al. \cite\Remillard\). This implies that the double kHz QPO phenomenon in neutron stars has its origin in properties of strong-field gravity and has little to do with the rotation of a stellar surface or any magnetic field structure anchored in the star.
@article{abramowiczEvidenceResonanceSco2003,
	title = {Evidence for a 2:3 resonance in {Sco} {X}-1 {kHz} {QPOs}},
	volume = {404},
	issn = {0004-6361},
	shorttitle = {Evidence for a 2},
	url = {https://ui.adsabs.harvard.edu/abs/2003A&A...404L..21A/abstract},
	doi = {10.1051/0004-6361:20030737},
	abstract = {We find evidence that the two high frequency QPOs in Sco X-1 are, more often than not, approximately in the 2:3 frequency ratio familiar from studies of black hole candidates (e.g., XTE J1550-564, Remillard et al. {\textbackslash}cite\{Remillard\}). This implies that the double kHz QPO phenomenon in neutron stars has its origin in properties of strong-field gravity and has little to do with the rotation of a stellar surface or any magnetic field structure anchored in the star.},
	language = {en},
	urldate = {2023-01-08},
	journal = {Astronomy and Astrophysics},
	author = {Abramowicz, M. A. and Bulik, T. and Bursa, M. and Kluźniak, W.},
	month = jun,
	year = {2003},
	pages = {L21--L24},
}

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