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Source Detection with the Perugia Wavelet code (PGWave)

Gamma-ray Large Area Space Telescope. Source Detection with the Perugia Wavelet code (PGWave). G. Tosti, G. Discepoli, D.Impiombato Physics Dept. & INFN - Perugia. Backg_1. Backg_. Backg_. Backg_n. list_1. List_. List. List_n. Source Detection Pipeline. DC2 FT1 v1. DC2 FT2 v1.

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Source Detection with the Perugia Wavelet code (PGWave)

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  1. Gamma-ray Large Area Space Telescope Source Detection with the Perugia Wavelet code (PGWave) G. Tosti, G. Discepoli, D.Impiombato Physics Dept. & INFN - Perugia

  2. Backg_1 Backg_ Backg_ Backg_n list_1 List_ List List_n Source Detection Pipeline DC2 FT1 v1 DC2 FT2 v1 Region_1 Region_ Region_ 2 gtcntsmap Region_n 3 Bkg Events File PGWave2D.exe 1 gtobssim Source catalog mergelist.py 4 clean_cat.py 5

  3. INPUT DATA • DC2 FT1 & FT2 v1 files, all events used • Sky coverage: 0<=RA<=360, -80<=DEC<=+80 • Counts and Bkg maps: • 40x40 deg (px size=0.25 deg) for -55<=DEC<=+55 • 30x30 deg (px size =0.25 deg) for -80<=DEC<-50 and 50<DEC<=80 • Overlapping among maps: 5 deg. • Projection: CAR (see Calabretta & Greisen, 2002,A&A 395, 1077) • Energy range: 100MeV<E<20GeV

  4. PGWave Code • PGWave is the “a priori” source detection code which implement a medley of several methods: • Wavelet Transform (Mexican Hat)-Sliding Cell - Threshold and Find algorithms

  5. PGWave input options In order to detect the maximum number of sources: • We used 8 Wavelet scales: 1.5 2.5 3.5 4.5 6 9 (in pixels). • We set the threshold k-significance of the detection at the minimum (equivalent to about 2 sigma, see Damiani et al. 1997). • We disabled the more than one scale detection option. • We disabled the S/N ratio threshold option

  6. PGWave output source list

  7. The Crab region gtcntsmap Counts Map gtobssim Background Map

  8. The Crab region Boxcircle = PGW Box = 3EG Cross = LAT_DC2_v1 Wavelet Transformed Map

  9. Significance map Boxcircle = PGW Box = 3EG Cross = LAT_DC2_v1 k-Significance Map

  10. DC2 PGWave Catalog 934 Sources detected

  11. PGWave Catalog at ASDC • http://www.asdc.asi.it/glast/gino_dc2/ (the on-line catalog was obtained applying cuts on the S/N & k-sign value)

  12. Catalog statistics k=2.5 k-sign

  13. DC2 v1 LAT_cat & 3EG Matching

  14. DC2 v1 LAT_cat & 3EG Matching 329 LAT_Cat_v1 sources detected 229 3EG sources detected

  15. 3c279 region False detection gtcntsmap Counts Map gtobssim Background Map

  16. RA=35 -- DEC=-35 gtcntsmap Counts Map gtobssim Background Map

  17. RA=245 –DEC=0 gtcntsmap Counts Map gtobssim Background Map

  18. The Moon and Sun Paths Sun Moon 01/01/208

  19. The Moon

  20. Conclusion • We have created a catalog of 934 sources (including the false ones) • 339/934 are in common with The LAT v1 • 229/934 are in common with the 3EG Catalog Next step: comparison with the ‘true’ simulated sources catalog

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