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

0313326 - ASÚ 2009 RIV PL eng J - Journal Article
Török, G. - Abramowicz, M. A. - Bakala, P. - Bursa, Michal - Horák, Jiří - Kluzniak, W. - Rebusco, P. - Stuchlík, Z.
Distribution of Kilohertz QPO Frequencies and Their Ratios in the Atoll Source 4U 1636-53.
[Rozložení poměrů frekvencí QPO ve zdroji 4U 1636-53.]
Acta Astronomica. Roč. 58, č. 1 (2008), s. 15-21. ISSN 0001-5237. E-ISSN 0001-5237
R&D Projects: GA MŠMT(CZ) LC06014
Institutional research plan: CEZ:AV0Z10030501
Keywords : X-rays * binaries stars * accretion disks
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 1.778, year: 2008

A recently published study on long term evolution of the frequencies of the kilohertz quasi-periodic oscillations (QPOs) in the atoll source 4U 1636-53 concluded that there is no preferred frequency ratio in a distribution of twin QPOs that was inferred from the distribution of a single frequency alone. However, 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.

Ukazujeme, že rozložení poměrů frekvencí párů QPO upřednostňuje poměr 3/2 a možná i 5/4. Vzhledem k protikladným tvrzením ve dvou nedávno publikovaných článcích, provádíme detailní rozbor rozložení párů ve frekvenčním prostoru.
Permanent Link: http://hdl.handle.net/11104/0164182