Find period for SGR 1627-41 - PowerPoint PPT Presentation

find period for sgr 1627 41 n.
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Find period for SGR 1627-41

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  1. Find period for SGR 1627-41

  2. Outline • SGR 1627-41 • RXTE(Rossi X-ray Timing Explorer) • Data Reduction and Analysis • Result

  3. SGR 1627-41 • First observation: Ulysses on 1998 June 17 • RA, DEC 163552.00,-473514.0J2000 • associate with nearby SNR : SNR G337.0-0.1

  4. HEARSARC BrowseSearch Results :Target id max status start time end time num ober PI Lname 70137-03 accepted 1 WOODS 80149-03 accepted 1 WOODS 80150-02 accepted 1 IBRAHIM 50145-01 archived 2001-08-10 2001-08-11 3 IBRAHIM 15:25:55.2 02:09:48.1

  5. RXTE • RXTE(Rossi X-ray Timing Explorer) • Launch date: Dec. 30, 1995 • Delta II rocket • Orbit: low-earth orbit (about 600 km and 23 deg inclination) • Weight: 3,045 kg • The RXTE is maneuverable (6 deg/minute)

  6. Instrument • PCA (Proportional Counter Array) • HEXTE (The High Energy X-ray Timing Experiment) • ASM (All-Sky Monitor) • EDS (Experiment Data System)

  7. PCA • The PCA is an array of five proportional counters with a total collecting area of 6500 square cm. The instrumental properties are: • Energy range: 2 - 60 keV • Energy resolution: < 18% at 6 keV • Time resolution: 1 microsec • Spatial resolution: collimator with 1 degree FWHM • Detectors: 5 proportional counters • Collecting area: 6500 square cm • Layers: 1 Propane veto; 3 Xenon, each split into two; 1 Xenon veto layer • Sensitivity: 0.1 mCrab • Background: 2 mCrab • Events detected by the PCA will be processed on board by the EDS before insertion into the telemetry stream

  8. Download Data • [50145-01] • [50145-01-00-00] • [50145-01-00-00A] • [50145-01-00-00Z] • [50145-01-00-01] • [50145-01-00-010] • [50145-01-00-01A] • [50145-01-00-01Z] • [50145-01-00-02] • [50145-01-00-02A] • [50145-01-00-02Z]

  9. [50145-01-00-02] • 3.944k sec • 637k events

  10. Data reduction • Use XDF to find your Event-mode datafiles • Convert GoodXenon1&2 into FITS • Examine the filter file • Create a bitmask • Extract a light curve • Correct for deadtime

  11. Use XDF to find your Event-mode datafiles >XDF >put GoodXenon1_xx, GoodXenon2_xx >make file list ==>fits_files.xdf

  12. Convert GoodXenon1&2 into FITS >make_se >fits_files.xdf ==>event_gx0

  13. Examine the filter file • PCUn_ON • NUM_PCU_ON • ELV • OFFSET • TIME_SINCE_SAA • ELECTRONn

  14. Create a bitmask >sefilter M-token [M[1]{1}]> E[VPR]>n D[0:4]{3}>n E[0:63]{6}>1,2 • ==>event_gx0.bit, event_gx0.fits

  15. Extract a light curveCorrect for deadtime • the dead time per event is approximately 10 microseconds for good xenon, propane and coincident events => it need not to do deadtime correction, when count rates << 10^5 count/sec

  16. Data Analysis >faxbary >powspec Newbin Time or negative Rebinning>-N Number of Newbins/Interval>N1 Number of Interval/Frame>N2 Rebin Results? (>1 Const rebin, <-1 geom. rebin, 0 none)>

  17. >efsearch period> Phasebins/Period> Number of Newbins/Interval>INDEF Resolution for period search>0.00001 Number of Periods to search>

  18. Powspec Newbin Time>-100 # of Newbins/Interval>65536 # of Interval/Frame>521Rebin >0PLT>error on

  19. Powspec Newbin Time>-100 # of Newbins/Interval>65536 # of Interval/Frame>521Rebin >0PLT>error off

  20. Powspec Newbin Time>-100 # of Newbins/Interval>65536 # of Interval/Frame>521Rebin >-1.01PLT>error on

  21. Powspec Newbin Time>-1000000# of Newbins/Interval>4096 # of Interval/Frame>1Rebin >0PLT>error on

  22. Powspec Newbin Time>-1000000 # of Newbins/Interval>4096 # of Interval/Frame>1Rebin >0PLT>error off

  23. Powspec Newbin Time>-1000000 # of Newbins/Interval>4096 # of Interval/Frame>1Rebin >0PLT>error on

  24. Powspec Newbin Time>-1000000 # of Newbins/Interval>4096 # of Interval/Frame>1Rebin >0PLT>error off

  25. Powspec Newbin Time>-1000000 # of Newbins/Interval>512# of Interval/Frame>7Rebin >0PLT>error on

  26. Powspec Newbin Time>-1000000 # of Newbins/Interval>512 # of Interval/Frame>7Rebin >0PLT>error off

  27. Powspec Newbin Time>-100 # of Newbins/Interval>512 # of Interval/Frame>7Rebin >0PLT>error off

  28. Efsearchperiod>12.84Phasebins/Period>20# of Newbins/Interval>INDEFResolution >0.00001# of Periods to search>1000