Volume 404, Number 1, June II 2003
|Page(s)||L21 - L24|
|Published online||26 May 2003|
Letter to the Editor
Evidence for a 2:3 resonance in Sco X-1 kHz QPOs
Visiting Professor, Institut d'Astrophysique de Paris, 98bis Bld. Arago, 75014 Paris, France
2 Université Pierre & Marie Curie (Paris VI), France
3 Department of Astrophysics, Chalmers University, 412-96 Göteborg, Sweden, e-mail: firstname.lastname@example.org
4 Copernicus Astronomical Centre, ul. Bartycka 18, 00-716 Warszawa, Poland, e-mail: email@example.com
5 Astronomical Institute, Charles University Prague, V Holešovičkách 2 CZ-180 00 Praha 8, Czech Republic e-mail: firstname.lastname@example.org
6 Institute of Astronomy, Zielona Góra University, Lubuska 2, 65-265 Zielona Góra, Poland, e-mail: email@example.com
7 Centre d'Étude Spatiale des Rayonnements, 9 Av. Colonel-Roche, 31028 Toulouse Cedex 4, France
Corresponding author: W. Kluźniak, firstname.lastname@example.org
Accepted: 25 April 2003
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]). 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.
Key words: dense matter / general relativity / stars: neutron / stars: Sco X-1 / X-rays: stars
© ESO, 2003
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