Searching Potential X-Ray Counterparts of GeV Sources J1837-0610
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Searching Potential X-Searching Potential X-Ray Counterparts of GeRay Counterparts of GeV Sources J1837-0610V Sources J1837-0610
盧亭霓盧亭霓 Lu Ting-NiLu Ting-Ni
2006.11.21 2006.11.21
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OutlineOutline• Introduction - Science purpose - GeV J1837-0610 • Data - download data - data reduction - analysis• Results• Conclusion• Reference
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IntroductionIntroduction• Science purpose - try to find next γ-ray pulsar.
• Gev J1837-0610 - an unidentified γ-ray source. - with a X-ray counterpart candidate AX J1837.5-0610 (Roberts M. S. E. et al, 2001, ApJS, 133, 451-456).
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Roberts M. S. E. et al, 2001, ApJS, 133, 451-456
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Roberts M. S. E. et al, 2001, ApJS, 133, 451-456
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IntroductionIntroduction• GeV J1837-0610
Roberts M. S. E. et al, 2001, ApJS, 133, 451-456
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DataData• Download data - constrain: a. center offset < 25 arcmin. b. exposure time > 10 ksec.
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DataData• Download data
Satellite name
ROSAT ASCA BeppoSax
MissionID
RP500204N00
26013000 26013010 21190001 211900011
Obs. date 1993.04.08
1998.04.02 1998.10.18 2001.03.12 2001.04.17
Exposure time (s)
19986 SIS18752
GIS21376
SIS18496
GIS 20256
LECS13494
MECS40060
LECS20039
MECS42605
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DataData• Data reduction - abandon ROSAT data: cannot find any point-like source near the area with RA~18h37m, Dec~-06h10m.
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The green circle is the region with center at (RA, Dec)=(18:37:29.000,-6:09:38.000), radius=90arcsec.
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DataData• Data reduction - abandon SIS data of ASCA: there’s only FAST mode data can be used to do timing analysis, but the FAST mode data isn’t offered by the archieve data.
- abadon LECS data of Beppo-SAX: the exposure time is too short. Also, there’s not any point-like source near the area with RA~18h37m, Dec~-06h10m
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DataData
Satellite name
ASCA BeppoSax
MissionID
26013000 26013010 21190001 211900011
Obs. date 1998.04.02 1998.10.18 2001.03.12 2001.04.17
Exposure time (s)
GIS21376
GIS 20256
MECS40060
MECS42605
Expansion time (s)
~37.3k ~40.1k ~94.5k ~105.1k
• Data reduction
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DataData• Data reduction - filter region and determine position: a. ASCA: *The point spread function (PSF) of GIS alone is a Gaussian with a FWHM of 0.5×(5.9/E 〔 keV 〕 ) arcmin. *The main energy band of the photons is at between 2.3keV and 7.1keV.
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The corresponds of the PI channel of ASCA to the energy band.
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DataData• Data reduction - filter region and determine position: b. BeppoSAX:
Originated from the cookbook for BeppoSAX NFI spectral analysis V1.2
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Originated from the cookbook for BeppoSAX NFI spectral analysis V1.2
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The corresponds of the PI channel of BeppoSAX to the energy band.
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DataData• Data reduction - filter region and determine position: besides, the region need to encloses the most photons of source but least photons of background.
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DataData
• Data reduction - filter energy: a. ASCA:
http://heasarc.gsfc.nasa.gov/docs/asca/gis_sis_effective_area.html
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DataData
• Data reduction - filter energy: b. BeppoSAX:
Originated from the cookbook for BeppoSAX NFI spectral analysis V1.2
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DataData
Satellite name ASCA Beppo-SaxMission ID 26013000 26013010 21190001 211900011
Obs. date 1998.04.02 1998.10.18 2001.03.12 2001.04.17
Position (RA.Dec) (18:37:29.000,-6:09:38.000) (18:37:32.500,-06:09:49.000)
Radius of region (arcsec)
90 210
Energy band 2-10 keV 2-10 keV
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DataData• Data reduction - barycentric time correction: to make the time on satellite be accordance with the time on earth.
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Left: before doing barycentric time correction; Right: after doing barycentric time correction.
Example of ASCA data(1998-04-02)
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DataData• Analysis - a. epoch folding. b. Zm2-Test. c. H-Test.
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DataData
Satellite name ASCA BeppoSaxMission ID 26013000 26013010 21190001 211900011
Obs. date 1998.04.02 1998.10.18 2001.03.12 2001.04.17
Exposure time (s) GIS21376
GIS 20256
MECS40060
MECS42605
Expansion time (s) ~37.3k ~40.1k ~94.5k ~105.1k
Number of photons 205 163 739 770
Search frequency (Hz)
(0.01, 10) (0.01, 10) (0.01, 100) (0.01, 100)
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DataData1998/04/2 2001/03/12 MJD=5.090553135e+04 MJD=5.198125968e+04 T=37.3 (ks) T=94.5 (ks)
ASCA Period (s)
H value r.p. BeppoSAX Period (s) H value r.p.
0.468115 3.77E+0
19.58E-
071.921297
4.36E+01
1.91E-07
1.133890 3.51E+0
12.05E-
0628.453860
4.46E+01
1.48E-07
3.835480 3.59E+0
11.62E-
0632.594138
4.12E+01
3.61E-07
4.098285 3.99E+0
15.16E-
0739.523627
4.63E+01
9.67E-08
6.487490 3.95E+0
15.76E-
0755.713702
4.13E+01
3.52E-07
6.487495 3.60E+0
11.57E-
0656.907721
4.54E+01
1.21E-07
1998/10/18 2001/04/17 MJD=5.110510478e+04 MJD=5.201665630e+04 T=40.1 (ks) T=105.1 (ks)
ASCA Period (s)
H value r.p. BeppoSAX Period (s) H value r.p.
3.745875 4.27E+0
12.42E-
075.4447178
4.32E+01
2.12E-07
6.964355 4.07E+0
14.14E-
0727.8330645
4.33E+01
2.07E-07
8.000580 5.15E+0
14.00E-
0849.4017113
4.37E+01
1.87E-07
55.5315288 4.32E+0
12.12E-07
69.1390553 4.38E+0
11.82E-07
98.2426908 4.68E+0
18.55E-08
Trial periods at which H value is larger than about 35
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DataData• Analysis - search counterpart periods of data: use the condition that the age of a pulsar should be larger than 1000 years to find possible periods in other data (which is observed at different time).
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ResultResult
date period (s)H value
date
counterpart
period (s)
H value
dp/dt (10-13 s/
s)
P1
2001/04/17
0.0144636052
43.82001/03
/120.0144630
248 23.6 1.898
P2
2001/03/12
0.0306803632
41.22001/04
/170.0306809
504 21.7 1.920
P3
1998/04/02
0.2607236 35.92001/04
/170.2607847
1 23.5 6.369
P4
1998/10/18
0.2669603 42.72001/04
/170.2672506
622.4 36.864
P5
2001/03/12
0.5204817 43.61998/10
/180.5200600 20.1 55.699
P6
1998/04/02
2.13623 37.72001/04
/172.139328 19.1
323.046
Tentative counterpart periods in ASCA and BeppoSAX data
Periods are reported with digits accurate to about one tenth of corresponding Fourier widths. The random probability (r.p.) is for one single trial only.
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ResultResult
period (s)Τc (year)
dp/dt (10-13 s/s)
S.P.E.
(erg s-1)B field
(G)
P10.01446360
52 1207 1.898
2.48E+39
1.68E+12
P20.03068036
32 2531 1.920
2.63E+38
2.46E+12
P3 0.2607236 6486 6.369 1.42E+3
61.30E+1
3
P4 0.2669603 1148 36.864 7.64E+3
63.18E+1
3
P5 0.5204817 1480 55.699 1.56E+3
65.45E+1
3
P6 2.13623 1048 323.04
6 1.31E+3
52.66E+1
4
Properties of the six tentative counterpart periods
Periods are reported with digits accurate to about one tenth of corresponding Fourier widths. Here used the period that has larger H value. The Τc is the characteristic age and equals to P/2P’. S.P.E. is the spin downenergy .
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Comparison between the six tentative counterpart periods and the high energy pulsar
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ConclusionConclusion• Age: the age of Crab is about 1300 years, but P1, P4 and P6 is young than Crab.• Period: the period of existent γ-ray pulsar is at the scale of millisecond, but P6 has period of 2 seconds.• S.P.E.: the S.P.E. of existent γ-ray pulsar is about 1034~1038 (erg s-1), but the S.P.E. of P1 is about 1039 (erg s-1).• Compare with existent γ-ray pulsar, I thought P2 is
more possible period within the six case, and infered from above that Gev J1837-0610 may be a crab-like pulsar.
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ReferenceReference• Roberts M. S. E., et al, 2001, ApJS, 133, 451-456• Gottfried Kanbach, 2002, 2002nsps. Conference• P. M. Wallace and N. J. Griffis, et al, 2000, APJ, 540: 184-191• M. Tavani, et al, 1997, APJ, 479: L109-L112• Takanori Sakamoto, 2001, 2001ASPC, Vol. 251• http://www.atnf.csiro.au/research/pulsar/psrcat/• http://heasarc.gsfc.nasa.gov/docs/asca/gis_sis_effective_ar
ea.html
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THANK YOU VERY
MUCH~~~!!