photometric calibration
DESCRIPTION
Photometric Calibration. Jorge F. Garc í a Yus GEMINI Observatory Barolo 2001. GSC-II Photometric Calibration. Calibrators: GSPC-I B, V magnitudes and brighter than 15 th TYCHO B Tycho , V Tycho magnitudes and brighter than 11.5 th GSPC-II B, V, R magnitudes and fainter as 20 th - PowerPoint PPT PresentationTRANSCRIPT
GSC-II Photometric Calibration
Calibrators: GSPC-I
B, V magnitudes and brighter than 15th
TYCHO BTycho, VTycho magnitudes and brighter than 11.5th
GSPC-II B, V, R magnitudes and fainter as 20th
Color transformations: One pair for each pass band available Range of validate
Cont….
Photographic plate material and filters: IIIaJ+GG385, IIIaF+RG610, IIIaJ+GG395, IIIaF+OG590……
Scanning and digitalization: GAMMA 1 and GAMMA 2, laser and white light
Pipeline data processing: SKYPROCESSOR INVENTORY DEBLENDER FINDCAT PHOTOSOL APPLY_CALYB
GSC 2 Photometric Calibration: from GSH files
S (blue suthern survey)
0
5
10
15
20
25
30
35
40
45
50
10 50 90 130
170
210
250
290
330
370
410
450
490
530
570
610
650
690
730
770
810
850
890
930
970
Number of calibrators
Number of calibrators per field
ER (red southern survey)
0
10
20
30
40
50
60
70
80
10 50 90 130
170
210
250
290
330
370
410
450
490
530
570
610
650
690
730
770
810
850
890
930
970
Number of calibrators
Statistic are over estimated by known problems.Stars with more than one color, calibrators with poor astrometry and multiple observations.
XJ (blue northern survey)
0
5
10
15
20
25
30
35
40
45
10 50 90 130
170
210
250
290
330
370
410
450
490
530
570
610
650
690
730
770
810
850
890
930
970
Number of calibrators
Inconsistence in early reference catalogs version.
XP (red northern survey)
0
10
20
30
40
50
60
10 50 90 130
170
210
250
290
330
370
410
450
490
530
570
610
650
690
730
770
810
850
890
930
970
Number of calibrators
UKST southern hemisphere material: IIIaJ+GG395 (blue) and IIIaF+OG590 (red)
S plates
0
50
100
150
200
250
12.25 12.75 13.25 13.75 14.25 14.75 15.25 15.75 16.25 16.75 17.25 17.75 18.25 18.75 19.25 19.75 20.25 20.75 21.25 21.75
magnitude limit
ER(XS) plates
0
20
40
60
80
100
120
140
160
180
200
12.25 12.75 13.25 13.75 14.25 14.75 15.25 15.75 16.25 16.75 17.25 17.75 18.25 18.75 19.25 19.75 20.25 20.75 21.25 21.75
magnitude limit
POSS-II northern hemisphere material: IIIaJ+GG385 (blue) and IIIaF+RG610 (red)
XJ plates
0
50
100
150
200
250
300
12.25 12.75 13.25 13.75 14.25 14.75 15.25 15.75 16.25 16.75 17.25 17.75 18.25 18.75 19.25 19.75 20.25 20.75 21.25 21.75
magnitude limit
XP plates
0
50
100
150
200
250
12.25 12.75 13.25 13.75 14.25 14.75 15.25 15.75 16.25 16.75 17.25 17.75 18.25 18.75 19.25 19.75 20.25 20.75 21.25 21.75
magnitude limit
POSS-II special constrains: location of original photometric calibrators are vignetted
XJ plates
0
50
100
150
200
250
300
350
400
450
500
0.125 0.375 0.625 0.875 1.125 1.375 1.625 1.875 2.125 2.375 2.625 2.875 3.125 3.375
distance from the center (deg)
XP plates
0
50
100
150
200
250
300
350
400
0.125 0.375 0.625 0.875 1.125 1.375 1.625 1.875 2.125 2.375 2.625 2.875 3.125 3.375
distance from the center (deg)
GSC 2.2.01 data: photometric analyze
From 1715 square degrees (full sky coverage) Rejected 77 southern fields where J magnitude
are not present (+/- 10° galactic latitude, SMC and LMC) ~5%
Founded and rejected 32, plates with suspicious photometry. (mainly large color residuals)
Total for analyze 1606 plates or 1606 square degrees
Faint Art. #s #cal dis err Plate Date Comment19.5 19.6 3 805 0.7 0.10 XJ005 7-JAN-200018.7 18.7 4 855 0.6 0.11 XP005 23-NOV-199919.8 19.7 1 578 0.1 0.11 XJ007 19-DEC-200019.1 18.7 1 406 0.1 0.13 XP007 7-JAN-200017.2 16.9 1 515 0.2 0.11 XJ016 7-JAN-2000 No faint GSPC216.2 15.9 1 541 0.2 0.13 XP016 7-JAN-2000 No faint GSPC217.1 16.8 1 413 0.1 0.09 XJ017 20-DEC-1999 No faint GSPC217.7 17.5 2 293 0.1 0.13 XP017 14-OCT-1999 No faint GSPC219.8 19.8 1 404 0.3 0.10 XJ020 7-JAN-200018.5 18.4 1 424 0.3 0.13 XP020 7-JAN-200020.8 20.7 3 699 0.2 0.17 XJ057 20-DEC-199918.6 18.7 3 806 0.1 0.13 XP057 17-JAN-200020.2 20.1 1 698 0.2 0.15 XJ074 6-SEP-200010.9 11.3 1 86 0.0 0.14 XP074 1-NOV-1999 No GSPC220.6 20.7 1 627 0.0 0.11 XJ219 19-DEC-200019.8 19.9 1 356 0.1 0.11 XP219 18-JUL-200121.0 21.2 3 958 2.5 0.15 XJ288 28-OCT-199917.4 17.2 2 77 0.3 0.18 XP288 27-DEC-2000 No faint GSPC219.2 19.3 6 775 0.1 0.12 XJ340 8-MAR-2000 low galactic latitude17.6 17.5 0 1174 0.0 0.19 XP340 21-JUN-2000 No faint GSPC220.3 20.5 1 280 1.2 0.18 XJ428 6-JAN-200019.7 19.7 1 504 1.0 0.14 XP428 6-DEC-199920.4 20.2 4 675 0.1 0.10 XJ493 23-AUG-200019.2 19.3 2 610 0.0 0.11 XP493 20-OCT-199920.8 20.8 2 324 0.2 0.10 XJ533 7-JAN-200018.7 18.7 2 272 0.3 0.13 XP533 7-DEC-199920.3 20.4 1 166 0.4 0.11 XJ599 11-JAN-200018.4 18.3 1 177 0.4 0.12 XP599 16-JAN-200118.4 18.1 2 134 0.2 0.08 XJ653 1-FEB-200017.4 17.2 2 150 0.2 0.12 XP653 16-DEC-1999 No faint GSPC220.0 20.0 1 195 0.4 0.12 XJ660 6-JAN-200011.6 11.8 0 132 0.0 0.16 XP660 16-DEC-1999 No GSPC220.7 20.6 2 246 1.3 0.16 XJ669 7-JAN-200019.0 18.8 1 201 1.9 0.12 XP669 2-DEC-200020.2 20.1 5 2021 0.4 0.12 XJ701 18-DEC-2000 bad matching?17.9 17.7 1 762 0.7 0.08 XP701 28-OCT-199919.4 19.2 1 1181 0.1 0.10 XJ773 5-OCT-2000 bad matching?18.4 18.4 2 209 0.6 0.13 XP773 24-JAN-2000
Faint Art. #s #cal dis err Plate Date Comment20.6 20.7 1 402 0.2 0.16 XJ847 7-FEB-200020.2 20.1 1 328 0.3 0.15 XP847 22-NOV-199920.9 21.0 1 97 0.5 0.10 XJ880 14-JAN-200119.8 19.8 1 71 0.0 0.15 XP880 11-NOV-199919.9 19.8 2 272 0.3 0.13 XS016 12-JAN-200020.8 20.4 1 579 0.0 0.13 S016 30-JAN-200119.8 19.6 1 432 0.1 0.15 XS162 10-DEC-199921.0 21.1 1 1003 0.1 0.16 S162 21-DEC-2000 bad matching?20.1 19.9 1 260 0.2 0.12 XS192 10-DEC-199920.8 20.4 2 492 0.0 0.19 S192 20-SEP-200019.6 19.5 2 1485 0.1 0.14 XS372 6-FEB-2001 bad matching?18.1 17.8 1 137 0.0 0.17 S372 8-SEP-199921.1 20.9 9 206 0.1 0.15 S430 15-NOV-1999 No red plate20.6 20.5 1 914 0.1 0.17 S452 5-OCT-2000 No red plate16.9 16.7 3 155 0.3 0.13 XS468 11-DEC-1999 No faint GSPC217.9 17.3 3 473 0.1 0.11 S468 21-SEP-2000 No faint GSPC217.4 17.6 6 679 0.0 0.27 S522 1-DEC-1999 * large error20.1 20.1 1 981 0.1 0.16 ER633 2-FEB-2001 bad matching?20.9 21.2 1 603 0.1 0.11 S633 29-NOV-200018.1 17.8 2 194 0.4 0.19 ER703 6-FEB-200118.8 18.9 1 823 0.2 0.12 S703 28-NOV-2000 bad matching?20.3 20.5 2 1417 0.1 0.15 ER774 12-FEB-2001 bad matching?21.0 21.1 2 818 0.2 0.13 S774 4-JAN-2001 bad matching?
Star completeness for 1606 pair of plates
Completeness for Star type objects
0
5
10
15
20
25
30
35
40
16.15 16.45 16.75 17.05 17.35 17.65 17.95 18.25 18.55 18.85
F magnitude
% of fields
All object completeness for 1606 pair of plates
Completness for all objects
0
5
10
15
20
25
30
16.15 16.45 16.75 17.05 17.35 17.65 17.95 18.25 18.55 18.85
F magnitude
% of fields
J - F color
13 < F < 14
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
-100 -80 -60 -40 -20 0 20 40 60 80 100
Galactic latitude
J - F color
14 < F < 15
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
-100 -80 -60 -40 -20 0 20 40 60 80 100
Galactic latitude
J - F color
15 < F < 16
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
-100 -80 -60 -40 -20 0 20 40 60 80 100
Galactic latitude
J - F color
16 < F < 17
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
-100 -80 -60 -40 -20 0 20 40 60 80 100
Galactic latitude
J - F color
17 < F < 18
-1.5
-1
-0.5
0
0.5
1
1.5
2
2.5
3
-100 -80 -60 -40 -20 0 20 40 60 80 100
Galactic latitude
GSC 2 color distribution as a galactic latitude function
Stellar in red and non stellar in blue
-2
-1
0
1
2
3
4
-100 -80 -60 -40 -20 0 20 40 60 80 100
Galactic latitude
Conclusions
GSC 2.2.01 provide at least 1 calibrated star (photometrical (J,F) and astrometrical) in a 2.5x2.5 minute squares. Dense enough for the telescope operation
The number of fields that need photometric recalibration are less than 5%
The major effort for the next release will be improving the accuracy for the faint end, providing an even product with a very good data quality for astrophysical research
An effort still needs is in the pass band characterization, specially oriented for the final users (Observing tools, proposals planning, etc.) …….may be my homework…