Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 1 Pulsar Blind search on DC2 data Gamma-ray Large Area Space Telescope Marcus Ziegler Bill Atwood Brian Baughman.

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Presentation transcript:

Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 1 Pulsar Blind search on DC2 data Gamma-ray Large Area Space Telescope Marcus Ziegler Bill Atwood Brian Baughman Robert Johnson

Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 2 Basic Idea take only differences with  t < max_diff max_diff used for DC2 data = s Calculate the Fourier-Transform of the time differences of the photon arrival times  t n.

Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 3 Data Selection As input all sources listed in the LATSourceCatalog_v1 were used (=> 380 sources) James Chiang and Johann Cohen helped to write a Python script to: - Pick a source from the catalog - Select all photons within a 2° radius around the source (no energy dependent cut yet!) - Correct the photon arrival time - Output the data into a text file -> Calculate differences and Perform the FFT

Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 4 Finding a Pulsar Candidate -> Calculate differences and Perform the FFT Source MRF0035 Look for frequency with the highest power Found F0 = /s DC2 Catalog = /s -> Scan takes about 5s

Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 5 Scan in Frequency derivative No F1 correction F1 corrected for Crab Found 2x Crab F0 = /s F1 = E-10 -> 1x Crab F0 = /s F1 = E-10 DC2 Catalog F0 = /s F1 = E-10 -> Scan takes about 15 min

Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 6 Source_IDLBFrequency_F0Best_F1Significance deg 1/s1/s*sPower/RMSIdentified asName MRF E ? MRF E PSR_B0833m45Vela MRF E PSR_J0633p1746Geminga MRF E PSR_J0633p1746**Geminga MRF E PSR_J2229p6114 MRF E-12839? MRF E-13821PSR_J1739m2903 MRF E-11423PSR_J1420m6048 MRF E-12417PSR_J1739m2903* MRF E-13404PSR_J1741m3927 MRF E-12326? MRF E-12312PSR_J1015m5719 MRF E-13242PSR_J1739m2903* MRF E-13224? MRF E-12198PSR_J1638m5226 MRF E-10129PSR_B0531p212xCrab MRF E-1393PSR_J1638m5226 MRF E-1284PSR_J1015m5719* MRF E-1279PSR_J1637m4642 MRF E-1173PSR_B0833m45**Vela MRF E-1070? MRF E-1267PSR_J1637m4642* MRF E-1360PSR_J1104m6103 MRF E-1154? MRF E-1153PSR_J1420m6048* MRF E-1047? MRF E-1247PSR_J1015m5719* MRF E-1047?

Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 7 The most significant sources MRF0054

Marcus Ziegler SCIPP/UCSCPulsar VRVS Meeting 8 Summary + Future plans - Scan found 12 Pulsars that were listed in the DC2 pulsar database - The scan found one unknown high significance pulsing source Things to improve - Use photon selection criteria based on the GLAST PSF - Use a longer integration time (increase the maximum difference) to increase the sensitivity.