2010A&A...515A..65L


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.27CET10:55:59

2010A&A...515A..65L - Astronomy and Astrophysics, volume 515, A65-65 (2010/6-1)

Quasi-periodic oscillations under wavelet microscope: the application of matching pursuit algorithm.

LACHOWICZ P. and DONE C.

Abstract (from CDS):

We zoom in on the internal structure of the low-frequency quasi-periodic oscillation (LF QPO) often observed in black hole binary systems to investigate the physical nature of the lack of coherence in this feature. We show the limitations of standard Fourier power spectral analysis for following the evolution of the QPO with time and instead use wavelet analysis and a new time-frequency technique - Matching Pursuit algorithm - to maximise the resolution with which we can follow the QPO behaviour. We use the LF QPO seen in a very high state of XTE J1550-564 to illustrate these techniques and show that the best description of the QPO is that it is composed of multiple independent oscillations with a distribution of lifetimes but with constant frequency over this duration. This rules out models where there is continual frequency modulation, such as multiple blobs spiralling inwards. Instead it favours models where the QPO is excited by random turbulence in the flow.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - methods: data analysis - techniques: miscellaneous

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 5548 Sy1 14 17 59.5401093128 +25 08 12.600227883   14.35 13.73     ~ 2435 0
2 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1051 0
3 V* V818 Sco LXB 16 19 55.0688745859 -15 38 25.019920749 11.60 12.40 11.1     Oev 1540 0
4 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1803 0

    Equat.    Gal    SGal    Ecl

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2021.01.27-10:56:00

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