Distribution of Kilohertz QPO Frequencies and Their Ratios in the Atoll Source 4U 1636-53

@article{42092,
   author = {Abramowicz, Marek and Bakala, Pavel and Stuchlík, Zdeněk and Török, Gabriel},
   article_location = {PL - Polská republika},
   article_number = {1},
   keywords = {QPO, frequency ratio},
   issn = {0001-5237},
   journal = {Acta Astronomica},
   title = {Distribution of Kilohertz QPO Frequencies and Their Ratios in the Atoll Source 4U 1636-53},
   year = {2008}
}

TY  - JOUR
ID  - 42092
AU  - Abramowicz, Marek - Bakala, Pavel - Stuchlík, Zdeněk - Török, Gabriel
PY  - 2008
TI  - Distribution of Kilohertz QPO Frequencies and Their Ratios in the Atoll Source 4U 1636-53
JF  - Acta Astronomica
IS  - 1
SN  - 00015237
KW  - QPO, frequency ratio
N2  - We find that the distribution of the ratio of actually observed pairs of kHz QPO frequencies is peaked close to the 3/2 value, and possibly also close to the 5/4 ratio. To resolve the apparent contradiction between the two studies, we examine in detail the frequency distributions of the lower kHz QPO and the upper kHz QPO detected in our data set. We demonstrate that for each of the two kHz QPOs (the lower or the upper), the frequency distribution in all detections of a QPO differs from the distributionof frequency of the same QPO in the subset of observations where both the kHz QPOs are detected. We conclude that detections of individual QPOs alone should not be used for calculation of the distribution of the frequency ratios.
ER  - 

ABRAMOWICZ, Marek, Pavel BAKALA, Zdeněk STUCHLÍK a Gabriel TÖRÖK. Distribution of Kilohertz QPO Frequencies and Their Ratios in the Atoll Source 4U 1636-53. \textit{Acta Astronomica}. PL - Polská republika, 2008, č.~1, 7 s. ISSN~0001-5237.