Gino Tosti – INFN Perugia 1DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
Source Detection with the Source Detection with the Perugia Wavelet code Perugia Wavelet code
(PGWave)(PGWave)
Gamma-ray Large AreaGamma-ray Large AreaSpace TelescopeSpace Telescope
G. Tosti, G. Discepoli, D.Impiombato
Physics Dept. & INFN - Perugia
Gino Tosti – INFN Perugia 2DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
Source Detection PipelineSource Detection Pipeline
gtcntsmap
PGWave2D.exe
mergelist.py
clean_cat.py
Region_1Region_
Region_Region_n
Backg_1Backg_
Backg_Backg_n
list_1
List_
List
List_n
Source catalog
gtobssim
Bkg Events File
DC2 FT2 v1DC2 FT1 v1
1
4
3
2
5
Gino Tosti – INFN Perugia 3DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
INPUT DATAINPUT 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
Gino Tosti – INFN Perugia 4DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
PGWave CodePGWave 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
Gino Tosti – INFN Perugia 5DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
PGWave input optionsPGWave 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
Gino Tosti – INFN Perugia 6DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
PGWave output source listPGWave output source list
crab.fits
[ID] [X] [Y] [RA] [DEC] [SNR] [K-signf] [Counts] [SigC] [BKG] [SigBkg]
1 40 9 93.283 3.767 7.576 7.824 473 62 321 19
2 111 13 76.308 4.903 7.54 6.017 365 48 154 13
3 22 22 97.869 6.658 11.075 10.823 836 75 424 22
4 11 23 100.561 6.631 11.484 12.501 848 74 385 21
5 149 31 66.717 8.645 1.079 3.16 44 41 188 14
6 126 40 72.206 11.412 20.229 23.734 1612 80 208 18
7 84 47 82.739 13.582 11.929 6.702 848 71 332 20
8 147 49 66.708 13.172 4.032 2.921 206 51 253 16
9 134 59 69.769 15.982 8.046 7.947 502 62 310 18
10 24 67 98.464 17.904 73.944 115.476 15793 214 93 35
11 149 67 65.67 17.587 19.205 19.266 1600 83 294 20
12 30 70 96.964 18.787 0 5.809 0 0 0 0
13 81 81 83.495 22.085 34.872 46.569 4565 131 536 29
14 41 84 94.326 22.491 18.511 21.289 1769 96 528 25
15 75 93 85.146 25.078 8.524 6.596 718 84 660 26
16 129 95 70.25 25.057 14.016 24.098 1025 73 302 19
Gino Tosti – INFN Perugia 7DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
The Crab regionThe Crab region
gtobssim Background Mapgtcntsmap Counts Map
Gino Tosti – INFN Perugia 8DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
The Crab regionThe Crab region
Boxcircle = PGWBox = 3EGCross = LAT_DC2_v1
Wavelet Transformed Map
Gino Tosti – INFN Perugia 9DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
Significance mapSignificance map
Boxcircle = PGWBox = 3EGCross = LAT_DC2_v1
k-Significance Map
Gino Tosti – INFN Perugia 10DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
DC2 PGWave CatalogDC2 PGWave Catalog934 Sources detected
Gino Tosti – INFN Perugia 11DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
PGWave Catalog at ASDCPGWave 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)
Gino Tosti – INFN Perugia 12DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
Catalog statisticsCatalog statistics
k=2.5
k-sign
Gino Tosti – INFN Perugia 13DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
DC2 v1 LAT_cat & 3EG MatchingDC2 v1 LAT_cat & 3EG Matching
Gino Tosti – INFN Perugia 14DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
DC2 v1 LAT_cat & 3EG MatchingDC2 v1 LAT_cat & 3EG Matching
329 LAT_Cat_v1 sources detected
229 3EG sources detected
Gino Tosti – INFN Perugia 15DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
3c279 region3c279 region
False detection
gtobssim Background Mapgtcntsmap Counts Map
Gino Tosti – INFN Perugia 16DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
RA=35 -- DEC=-35RA=35 -- DEC=-35
gtobssim Background Mapgtcntsmap Counts Map
Gino Tosti – INFN Perugia 17DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
RA=245 –DEC=0RA=245 –DEC=0
gtobssim Background Mapgtcntsmap Counts Map
Gino Tosti – INFN Perugia 18DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
The Moon and Sun PathsThe Moon and Sun Paths
Sun
Moon
01/01/208
Gino Tosti – INFN Perugia 19DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
The Moon The Moon
Gino Tosti – INFN Perugia 20DC2 Closeout Meeting - GSFC May 31 –June 2, 2006
ConclusionConclusion
• 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
