ESAC
XMM-Newton EPIC relative
timing analysis
Isabel Caballero
Anne Wellbrock
M.G.F. Kirsch
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 1
ESAC
Outline
1.
2.
3.
4.
5.
6.
Relative timing accuracy
Targets
Processing of data
Radio period of the pulsars
X-Ray period of the pulsars
Final results
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 2
EPIC-pn Relative timing accuracy



ESAC
Fastest instrument on XMMNewton
Highest time resolution reached
in timing and burst modes
Pulsars used in analysis
observed in these modes
X-Ray Period = P
Radio Period = P
X
PR-PX
P
PR
PR
R
Relative Error
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 3
ESAC
Crab pulsar
XMM-Newton performs two observations a year of the Crab
 Distance: ~2.2kPc
 Period: ~33ms
Rev
0056
0234
0411
0411
0411
0411
0698
0700
0874
0874
0955
0955
0955
ID
0122330801
0135730701
0153750201
0153750301
0153750401
0153750501
0160960201
0160960301
0160960401
0160960601
0160960701
0160960801
0160960901
Obs. Time (ks)
22577
9999
4634
8999
8996
8999
28264
10172
14718
3983
8202
5000
8202
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 4
ESAC
PSR 0540
• Pulsar in the Large Magellanic Cloud
• Distance: ~50kPc
• Period: ~50ms
Rev
0085
ID
0125120201
Obs.Time (ks)
17
Chandra, X-ray band, NASA
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 5
ESAC
PSR 1509-58
• Pulsar in the SNR MSH 15-2
• Distance: ~6kPc
• Period: ~150ms
Rev
ID
0137 0128120401
Obs.Time (ks)
10
Chandra, X-ray band, NASA
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 6
ESAC
PSR B1055-52
 One of the ‘three musketeers’ (PSR B1055, B0656,Geminga)
 Distance: 0.5 – 1.5 kPc
 Period: 197ms
Rev
0187
ID
0113050201
Obs.Time (ks)
30
BeppoSax, 1-10keV, NASA
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 7
data processing
ESAC
AIO (XMM-Science Archive)
ODF
epproc
Event File
barycen
Event File Barycentric Corrected
evselect
Source Region
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 8
ESAC
Radio periods of the pulsars
Radio Period
Radio Period
Linear
Interpolation
Extrapolation
Epoch (MJD)
Epoch (MJD)
Crab
B0540, B1509, B1055
Automatic tool
for Crab!
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 9
X-ray period of the pulsars
ESAC
Fold the data over a range of test periods Pi:
Intensity
P3
First trial: radio period
P2
P1
efsearch
Time
For each test period determine 2 of the fit of
the folded light curve vs. a uniform distribution:
Good period
High 2
Bad period
Small 2
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 10
2 distribution
The weighted mean of the periods with
2 gives the best X-ray period
ESAC
FWHM  P2/T
Reduced chi2 vs period for all pulsars
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 11
Folded light curves
ESAC
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 12
P/P
P/P
Relative timing accuracy for the Crab
ESAC
time base (log(sec))
epoch (MJD)
P/P<3.10-8
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 13
P/P
P/P
Relative timing accuracy for all pulsars
ESAC
Period (ms)
Revolution
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 14
Things to do now…
ESAC
 Automatic tool available to check the relative
timing accuracy for future Crab observations
 Future XMM-Newton observation of pulsars
B0540 and B1509 in order to verify relative
timing??
 Absolute timing analysis: create a tool to check
the absolute timing accuracy  geo-centre XMM
data or barycentre radio data
XMM-Newton
Isabel Caballero, Anne Wellbrock
Page 15