X-RAY BURSTS FROM THE TERZAN 5 TRANSIENT IGR J17480-2446: NUCLEAR RATHER THAN GRAVITATIONAL

被引：14
作者：
Chakraborty, Manoneeta [1 ]
Bhattacharyya, Sudip [1 ]
机构：
[1] Tata Inst Fundamental Res, Bombay 400005, Maharashtra, India
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 730卷 / 02期
关键词：
accretion; accretion disks; stars: neutron; X-rays: binaries; X-rays: bursts; X-rays: individual (IGR J17480-2446); X-rays: stars; RAPID BURSTER;
D O I：
10.1088/2041-8205/730/2/L23
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The 2010 outburst of the transient neutron star low-mass X-ray binary IGR J17480-2446 has exhibited a series of unique X-ray bursts as well as millihertz (mHz) quasi-periodic oscillations (QPOs) related to these bursts. It has been recently proposed that these are type-II bursts, powered by the gravitational energy. This implies that the current nuclear-burning-based model of mHz QPOs is not correct, and this timing feature cannot be used as a tool to measure the neutron star parameters. We report the analysis of the Rossi X-Ray Timing Explorer data of IGR J17480-2446 to show that the burst properties of this source are quite different from the properties of the type-II bursts observed from the rapid burster and GRO J1744-28. For example, the inferred ratio (similar to 50-90) of the non-burst fluence to burst fluence is consistent with the thermonuclear origin of IGR J17480-2446 bursts and is significantly different from this ratio (less than or similar to 4) for type-II bursts. Our results suggest that the bursts and the mHz QPOs from IGR J17480-2446 are powered by the nuclear energy.
引用
收藏
页数：4
相关论文
共 27 条
  • [11] GALLOWAY DK, 2010, ATEL, V3000
  • [12] THERMONUCLEAR (TYPE I) X-RAY BURSTS OBSERVED BY THE ROSSI X-RAY TIMING EXPLORER
    Galloway, Duncan K.
    Muno, Michael P.
    Hartman, Jacob M.
    Psaltis, Dimitrios
    Chakrabarty, Deepto
    [J]. ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 2008, 179 (02) : 360 - 422
  • [13] Millihertz quasi-periodic oscillations from marginally stable nuclear burning on an accreting neutron star
    Heger, Alexander
    Cumming, Andrew
    Woosley, S. E.
    [J]. ASTROPHYSICAL JOURNAL, 2007, 665 (02) : 1311 - 1320
  • [14] Faint X-ray sources in the globular cluster Terzan 5
    Heinke, C. O.
    Wijnands, R.
    Cohn, H. N.
    Lugger, P. M.
    Grindlay, J. E.
    Pooley, D.
    Lewin, W. H. G.
    [J]. ASTROPHYSICAL JOURNAL, 2006, 651 (02) : 1098 - 1111
  • [15] A new type of transient high-energy source in the direction of the Galactic Centre
    Kouveliotou, C
    vanParadijs, J
    Fishman, GJ
    Briggs, MS
    Kommers, J
    Harmon, BA
    Meegan, CA
    Lewin, WHG
    [J]. NATURE, 1996, 379 (6568) : 799 - 801
  • [16] Photospheric radius expansion X-ray bursts as standard candles
    Kuulkers, E
    den Hartog, PR
    in't Zand, JJM
    Verbunt, FWM
    Harris, WE
    Cocchi, M
    [J]. ASTRONOMY & ASTROPHYSICS, 2003, 399 (02): : 663 - 680
  • [17] Lewin W.H. G., 1995, XRAY BINARIES, P175
  • [18] Lewin WHG, 1996, ASTROPHYS J, V462, pL39, DOI 10.1088/1538-4357/462/1/L39
  • [19] LINARES M, 2010, ATEL, V2958
  • [20] LINARES M, 2011, ARXIV11021455
123