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Absolute and Relative Timing with the EPIC-pn Camera

M. Kuster, E. Kendziorra, S. Benlloch W. Becker

Institut fЭr Astronomie und Astrophysik, TЭbingen

Max-Planck-Institut fЭr Extraterrestrische Physik, Garching/MЭnchen

U. Lammers, G. Vacanti, E. Serpell

ESA / ESTEC, Astrophysics Division (SA), Noordwijk

New Vision of the X-ray Universe, Nov. 2001

M. Kuster, IAAT


EPIC-pn Readout Modes
Live Time [%] 99.94 99.98 71.01 94.86 99.12 2.98 47.66 0.0296 0.0072 5.67 199.19 73.36 0.7 N.A. 11 1.1 146 6.3 · 103 Time Resolution [ms] Pile-up Limit [mCrab]

Mode

Full Frame

ext. Full Frame

Small Window

Large Window

Timing

Burst

New Vision of the X-ray Universe, Nov. 2001

M. Kuster, IAAT


Observations
RXTE Int. Time 9.6 ksec 10 ksec 7 ksec Additional radio data (Jodrell Bank) 17 ksec 40 ksec PSR 1509 data provided by A. Rots Crab PSR B1509 Object Int. Time 2.0 ksec 0.9 ksec

XMM-Newton Mode Timing Timing Burst Timing

Object

Rev.

PSR B1509

137

(P » 150 ms)

137

Small Win

Crab

56

(P » 33 ms)

56

Small Win

234

PSR B0540

85

(P » 50 ms)

85

Small Win

New Vision of the X-ray Universe, Nov. 2001

M. Kuster, IAAT


XMM Fast Modes RXTE PCA

Pulse Profile Crab Pulsar (Rev. 0056) XMM: TM

t = 7.0 ksec el. Chopper 25 teff 0.3 ksec t = 7.0 ksec

BM

RXTE:

teff = 0.9 ksec

Light curves are binned with t = 1 m s XMM fast modes: only central emission region used less non pulsed flux
M. Kuster, IAAT

New Vision of the X-ray Universe, Nov. 2001


Timing Mode Small Window Mode
XM M Timing Mode teff = 9.6 ksec t = 1 m s

Pulse Profile PSR B1509 (Rev. 137)

SW Mode

teff = 9.6 ksec t = 6 m s

RXTE PCA teff = 2.0 ksec t = 1 ms

New Vision of the X-ray Universe, Nov. 2001

M. Kuster, IAAT


EPIC pn MOS Timing Mode
EPIC MOS / PSR 1509

EPIC pn / PSR 1509

We get consistent results in both cameras for:

Pulse Shape Pulse Period
M. Kuster, IAAT

New Vision of the X-ray Universe, Nov. 2001


Crab - Timing Mode
Resulting Pulse Period XMM Timing Mode P = 33.50842 ± 0.00004 ms XTE PCA P = 33.50824 ± 0.00012 ms P/P = 5.7 · 10
-6

2-Distribution

New Vision of the X-ray Universe, Nov. 2001

M. Kuster, IAAT


Readout Noise Timing Mode
Using time resolution higher than frame time in fast modes Aliasing effect of the readout window Simulation: Poissonian Noise + Readout Window Average of 2500 PSD ! Time resolution 29.5 µs

(Kuster et al., Proc. SPIE '99) M. Kuster, IAAT

New Vision of the X-ray Universe, Nov. 2001


QPO Detection
Burst Mode

Timing Mode

Simulation:

kHz QPO (AR[2]) folded with readout window

No detection in Bust Mode above Critical Frequency = Frame Time

Time res.:

TM BM

29.5 µs 7.2 µs

New Vision of the X-ray Universe, Nov. 2001

M. Kuster, IAAT


Influence of Detector Configuration
Counting Mode

Electronic Chopper

Integration time t = 7.0 ks teff = 0.3 ks (Chopper=25)

Integration time t = 9.2 ks Check telemetry constraints !

New Vision of the X-ray Universe, Nov. 2001

M. Kuster, IAAT


Status of the callibration / Conclusions

Frequencies above 500 Hz should be handled with care. Inconsistencies in the relative and absolute time

under investigation will be solved soon

Relative time accuracy ±4 µs deviation in pulse periods (P/P 10-6 )

The EPIC-pn camera allows:

Pulse phase resolved spectral analysis Pulse analysis

The EPIC-pn camera is the fastest X-ray CCD available at the moment !
M. Kuster, IAAT

New Vision of the X-ray Universe, Nov. 2001