SLIDE 1
Overview
- Observation and Data Reduction
- Results
- Timing analysis
- Spectral analysis
- Connection between timing & spectral analysis
- Discussion and Conclusion
- New Data from 2010-04-03 (hard state)
Timing properties of the black hole candidate XTE J1752-223 during - - PowerPoint PPT Presentation
Timing properties of the black hole candidate XTE J1752-223 during - - PowerPoint PPT Presentation
Timing properties of the black hole candidate XTE J1752-223 during the initial hard state of its 2009-2010 outburst Tao Chen Overview Observation and Data Reduction Results Timing analysis Spectral analysis Connection between
SLIDE 2
SLIDE 3
On 2009-10-23 at 19:55 UT, RXTE discovered a new source while scanning the galactic bulge region, designated XTE J1752-223. Based on the existing PCA scan data, the best fit position is, R.A. = 268.05(16), Dec. = -22.31(4) (J2000). The 2-10 keV flux of the source at that time was about 30 mCrab. (1 mCrab = 2.4e-11 erg/cm/s^2, 2-10 keV)
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Observation interval:MJD 55132 - 55155 Data format: RXTE/PCA Timing: Event and/or Binned Spectral: Standard 2 Software: HEASOFT v. 6.8 (powspec & xspec)
Observation and Data Reduction
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Timing Result
Power Spectra Density were fitted by 2 Lorentzians
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Power Spectrum Density
- f XTE J1752-223
The PDS produced for whole interval ~2000 sec., and averaged for 128 sec., with step of 0.015625 sec.
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The Change of First Lorentzian's
- Char. Frequency
The central frequency of this Lorentzian is frozen to zero
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The Change of Second Lorentzian's
- Char. Frequency
The central frequency of this Lorentzian is free
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The Change of First Lorentzian's RMS
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The Change of Second Lorentzian's RMS
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Spectral Result
Energy Spectra (2.55~45 keV) were fitted by model reflect*phabs(powerlaw+gaussian)
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The Change of Photon Index and Reflection Scaling Factor
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Correlation between timing and spectral
Number 1 means First Lorentzian Number 2 means Second Lorentzian
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Characteristic Frequency 1 & 2
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RMS 1 & Photon Index
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RMS 2 & Photon Index
SLIDE 17
- Increasing of Photon Index
(going to the IS state)
- Increasing of Ch. Freq. (i.e.
the radius of Inner disc is increasing)
- Decreasing of RMS (probably
disc getting brighter)
- Cold disc (from Swift obs.)
Discussion and Conclusion
- Disk sets frequency?
- One of the Lorentzian
linked to Power Law?
- Second Lorentzian has
another origin.
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New Data from 2010-04-03 (hard state)
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PDS
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The change of RMS
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The change of Ch. Freq.
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