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X-Ray Binary Light-Curve Analysis in optical and x-ray or “the ‘crazy’ LMXB (low mass x-ray binary) EXO “ Trainee: Alexander Kolodzig Origin: HU Berlin, UCM Madrid (Erasmus) Tutor: Maria Diaz Trigo ESA-Stay: 03/ /2008 Background Picture Credits - Binary System: with ESA, NASA and Felix Mirabel - XMM-Newton: ESA (Image by C. Carreau)
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
Overview 1. The Observed Object 2. Light-Curve – Analysis 2.1. My Main Project-Tasks 2.2. Light Curve Creation 2.3. Modeling & Analysis 2.4. Further Analysis , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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1. The Observed Object 1.1. Components of a LMXB (1/2)
Video Credits: D. Klochkov 2008 , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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1.1. Components of a LMXB (2/2)
Video Credits: D. Klochkov 2008 , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
1.2. System Parameters Orbital Period: hours (Parmar et al. 1985) Estimate Distance: kpc (Wolff et al. 2005) Inclination: 75° - 83° (Parmar et al. 1986) , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
1.3. Discovery First Light-Curve (by EXOSAT) Burst Dip Eclipse Credit: Parmar et al. 1986 , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
1.4. Main Features „light curve shows a remarkable amount of structure“ (Parmar et al. 1985) sharp x-ray & broad optical eclipses phase depending analysis strong, irregular & periodic dipping activity frequent x-ray burster with doublets & triplets system remains active since discovery (23 years) , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2. Light-Curve – Analysis 2.1 My Main Project-Tasks
creation and validation of the optical light curves (LC‘s) burst-deleting & folding of x-ray & optical LC‘s comparison of the x-ray & optical LC‘s modeling of bursts & eclipses in x-ray LC‘s modeling the optical LC’s , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.2. Light-Curves Creation 2.2.1. XMM-Newton Satellite
3 independent X-RAY cameras EPIC PN (Array of 12 CCDs) Wavelength - Range: keV 1 independent Optical/UV monitor (OM) , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.2.2. Optical Light-Curves (1/2)
Observation-Date in ‘Image+Fast Mode’ high time resolution White Filter high intensity , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.2.2. Optical Light-Curves (2/2)
Light Curve Extraction SAS (Science Analysis Software) task ’omfchain‘ automatic source & background selection time sampling: 1 second good signal-to-noise ratio inspection of the correct automatic selection SAS task ‘barycen’ time correction to the ‘solar system barycentre’ , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
Observation-Log Observations within 6 days! In all cases the EPIC pn was operated in Small Window Mode with the Medium Filter and the OM in Image+Fast Mode with the White Filter. , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
2.3. Modeling & Analysis 1. Continuum 2. Eclipses x-ray = red optical = blue 3. Bursts 4. Periodicities (Dips, Modulations) , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.3.1.a) x-ray Continuum (1/2)
Flux for all Plots Time/Phase Binning: 60 seconds , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.3.1.a) x-ray Continuum (2/2)
just 24,5 hour time gap between Observations Double Burst Triple Burst Burst Triple Burst Dip Eclipse Binning: 60 seconds , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.3.1.b) optical Continuum (1/2)
Binning: 60 seconds , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.3.1.b) optical Continuum (2/2)
just 24,5 hour time gap between Observations Double Burst Burst Triple Burst Triple Burst Eclipse Binning: 60 seconds , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.3.1.c) optical & x-ray Continuum
just 24,5 hour time gap between Observations Double Burst optical Flux x-ray Flux Burst Triple Burst Triple Burst [0,220] Dip [10,45] Eclipse Binning: 60 seconds , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
2.3.2.a) x-ray Eclipses Ingress Egress (green Number = Eclipse-Number in the Observation) Binning: 1 second , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.3.2.b) Eclipses Results (1/2)
X-ray: Hard-Band (5-10 keV) less Dip affected Flux (Hard-Band): 0.24 0.20 Count/s Ratio of Persistent Flux: 5,5% Eclipses not total evidence of a ‘Corona’ , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.3.2.b) Eclipses Results (2/2)
Period (x-ray): 0.06 s (42 Eclipse in 54 days) (3, 0, hours) Parmar et al 1991: 13766,780 0,002 s (33 Eclipses in 4.1 years; linear Ephemeris) , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
2.3.2.c) optical Eclipses optical Gap optical Flux Binning red & blue: 60 seconds yellow (x-ray): 1 second [7,20] , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
optical LC Modeling simple Model: C - Constant A - Amplitude xo - Phase-Shift p - Period optical Periods: , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
2.3.4.a) Burst Modeling X-Ray: with pile-up correction Binning: 1 second , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
2.3.4.b) Burst Delay , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
2.3.4.c) optical Risetime , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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2.3.5.a) Dips Definition: Example-Video:
“Dips are due to the central x-ray source being obscured by some structure above the disk.” (e.g. Frank et al. 1987) Example-Video: Video Credits: D. Klochkov 2008 , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
2.3.5.b) Folded Light Curve 500 points/Phase same Period for all: seconds , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
Folded Light Curve , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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X-Ray Binary Light-Curve Analysis - A.Kolodzig
2.4. Further Analysis find super-period (around 50 or 27 hours) preccessing, tilted accretion disc ? bursts-decay-modeling phase-decay correlation ? better model for the optical LC’s deeper analysis of periodicities in the system and many many more (still after 23 years!) , ESAC X-Ray Binary Light-Curve Analysis - A.Kolodzig
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Thanks for your Attention!
Background Picture Credits - Binary System: with ESA, NASA and Felix Mirabel - XMM-Newton: ESA (Image by C. Carreau)
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