2013MNRAS.428.1704L


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.16CEST11:25:45

2013MNRAS.428.1704L - Mon. Not. R. Astron. Soc., 428, 1704-1714 (2013/January-2)

The energy dependence of the centroid frequency of the low-frequency quasi-periodic oscillations in XTE J1550-564.

LI Z.B., QU J.L., SONG L.M., DING G.Q. and ZHANG C.M.

Abstract (from CDS):

In this paper, we investigate the energy dependence of the centroid frequency of the low-frequency quasi-periodic oscillations (QPOs; 0.08-20Hz) in XTE J1550-564. We have used the observational data from the Rossi X-ray Timing Explorer during the first half part of the 1998-1999 outburst. We have found that the centroid frequency of the fundamental QPO did not vary with photon energy when its QPO frequency was less than ∼ 0.4-0.8Hz and it did not increase much when its frequency was between ∼ 0.8 and ∼ 3.3Hz. However, it clearly increased with photon energy when it was larger than ∼ 3.3Hz. The most interesting point is that it increased much more quickly with photon energy when its centroid frequency was between ∼ 6 and ∼ 8.5Hz. Subsequently, its rising rate dropped sharply when its frequency was larger than ∼ 8.5Hz. We have also investigated the dependence of the first-harmonic and subharmonic QPO frequency on photon energy. We have found that for more than 70 per cent of the subharmonic QPO observations, the frequency increased with the photon energy, while the rest did not change obviously. Meanwhile, ∼ 60 per cent of the first-harmonic QPOs exhibited a negative correlation between their frequencies and photon energy, while the remaining correlations were irregular. For the amplitudes of the QPOs, complicated dependences on photon energy were also found. The amplitudes of the first-harmonic and subharmonic QPOs have shown a similar correlation with photon energy (i.e. their amplitudes increased with photon energy until ∼ 6-7 keV, beyond which the amplitudes decreased). By contrast, the fundamental QPO amplitude increased until ∼ 10 keV and became saturated toward higher energies. These newly discovered patterns of the dependence of QPOs on photon energy cannot be easily explained in the currently existing frames of QPO models. Therefore, they provide an important insight into our understanding of QPO physics.

Abstract Copyright: © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2012)

Journal keyword(s): accretion, accretion discs - black hole physics - stars: individual: XTE J1550-564 - stars: low-mass - stars: oscillations - X-rays: binaries

VizieR on-line data: <Available at CDS (J/MNRAS/428/1704): table1.dat table2.dat table3.dat>

CDS comments: p.1713, GRS 1915-105 is a probable misprint for GRS 1915+105.

Simbad objects: 8

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Number of rows : 8

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 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1062 0
2 [GHJ2008] 3 HXB 16 50 00.980 -49 57 43.60     11.89     K4V 358 0
3 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1751 1
4 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1826 0
5 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 631 0
6 XTE J1752-223 LXB 17 52 15.090 -22 20 32.36           ~ 168 0
7 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2361 0
8 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3997 0

    Equat.    Gal    SGal    Ecl

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2021.04.16-11:25:45

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