GSCII Project

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GSCII Project
Gauging the quality of the GSCII DB with
QA_2plates First results
R. Pennons, R. Morbidelli, A Spagna, M.
G.Lattanzi
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Diagram of QA_2plates procedures
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QA_2PlatesFirst level procedures (connection
with CIQA)
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QA_2Plates second level procedures
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QA_2PlatesThird level procedures
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Star counts
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Magnitude equation
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D(mag) vs mag
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Positional error as function of plate position
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Magnitude error as function of plate position
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The sample of processed plates

• NUMBER OF SOURCE PLATES 067
• NUMBER OF PLATE PAIRS QAed 840
• PAIRS OF GSC I-II/GSCII PLTS WITH RELIABLE
  RESULTS 708 335
• PAIRS OF GSC I-II /GSCII PLTS WITH SAME
  COL.DIFF.AREA 127 059
• PAIRS OF GSC I-II /GSCII PLTS WITH SAME AREA
  DIFF.COL. 091 064
• PAIRS OF GSC I-II /GSCII PLTS WITH DIFF.COL.-
  DIFF.AREA 479 212
• PAIRS OF GSC I-II /GSCII WITH SAME COL. AND SAME
  AREA 011 000

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GALACTIC REPRESENTATION OF THE GSCII PLATES AT
OATO
Source () Overlap (?)
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Results from GSCII plate pairs
STARS-STARS NON STARS - NON
STARS D? ? D? ?
D mag ? D? ? D?
? D mag ? MEAN VAL.GSCII ALL
DATA 0.00 0.55 -0.00 0.49 0.01 0.47 0.00
0.72 -0.00 0.69 0.01 0.59 ? GSCII ALL
DATA 0.42 0.20 0.23 0.17 1.01 0.20 0.38
0.18 0.19 0.17 1.00 0.23 MEAN VAL. GSCII
SAME COL. 0.02 0.50 -0.00 0.44 0.04 0.27
0.02 0.67 -0.01 0.61 0.03 0.32 ? OF GSCII
SAME COL. 0.51 0.18 0.22 0.15 0.27 0.08
0.48 0.20 0.26 0.17 0.34 0.12 MEAN
VAL.GSCII SAME AREA 0.00 0.38 0.00 0.36 0.00
0.54 0.00 0.64 0.00 0.63 -0.00 0.61 ? OF
GSCII SAME AREA 0.15 0.16 0.17 0.15 1.30
0.20 0.13 0.20 0.15 0.20 1.27 0.18 MEAN
VAL.GSCII DIFF.AREA - COL 0.00 0.61 -0.00 0.54
-0.00 0.51 0.00 0.76 -0.00 0.72 0.00
0.65 ? OF GSCII DIFF. AREA - COL. 0.44 0.17
0.24 0.16 1.04 0.19 0.39 0.15 0.19 0.16
1.03 0.20
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Results of generic pair of plates
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Percentage of outliers
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Comparison GSCI GSCII and GSCII plates ( sDx
case ) stars stars
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Comparison GSCI GSCII and GSCII plates ( sDh
case ) stars stars
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Comparison GSCI GSCII and GSCII plates ( sDx
case ) nostars nostars
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Comparison GSCII plates ( sDx case ) stars/stars
and non stars/non stars
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Comparison GSCII ( sDx sDh )star-star case
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Comparison GSCII ( sDx sDh )non star-non star
case
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Comparison GSCII ( sDx sDh )star-star case,
same color
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Comparison GSCII ( sDx )star/star and
non-star/non-star case same color
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Comparison GSCII ( sDx ) star/star case same
area/diff. color and same color/diff. area
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Comparison GSCII ( sDx ) non-star/non-star case
same area/diff. color and same color/diff. area
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Comparison GSCII ( sDx ) star/star and
non-star/non-star same area/diff. color
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Comparison GSCI GSCII and GSCII plates ( sD
magnitude) starstar
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Comparison GSCI GSCII and GSCII plates ( sD
magnitude) non-star/non-star
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Comparison GSCII plates ( sD magnitude)
star/star and non-star/non-star
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Comparison GSCII ( sD mag.) star/star case same
color/diff. area and same area/diff. color
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Comparison GSCII ( sD mag.) non-stars/non-stars
case same color/diff. area and same area/diff.
color
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Comparison GSCII plates( sD mag ) star/star and
non-star/non-star same color diff. area
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Comparison GSCII plates( sD mag ) star/star and
non-star/non-star diff. color same area
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Comparison GSCII plates(Dx ) star/star and
non-star/non-star
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Comparison GSCII plates (Dx and Dh ) star/star
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Comparison GSCII plates(Dx ) star/star and
non-star/non-star same color and different area
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Comparison GSCII plates(Dx ) star/star and
non-star/non-star different color and same area
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Comparison GSCII plates(Dx ) star/star diff.
color/same area and same color/diff. area
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Comparison GSCII plates(Dx ) non-star/non-star
diff. color/same area and same color/diff. area
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Comparison GSCII plates( D mag ) star/star and
non-star/non-star
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Comparison GSCII plates( D mag ) star/star same
color/diff. area diff. Color/same area
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Comparison GSCII plates( D mag )
non-star/non-star same color/diff. area diff.
Color/same area
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Summary Notes

• THIS IS A FIRST SYSTEMATIC ASSESSMENT OF GSCII
  DATA QUALITY BASED ON A LIMITED NUMBER OF PLATES.
  THESE ARE DISTRIBUTED AROUND THE GALACTIC PLANE
  AND THE GALACTIC POLES.
• AS EXPECTED, THE ASTROMETRY IN BOTH COORDINATES
  IS BETTER FOR THE STAR/STAR CASES THAN FOR THE
  NON-STAR/NON-STAR ONES
• THE ?(??) IS ON AVERAGE BETTER THAN ?(??)
  IRRESPECTIVE OF CLASSIFICATION
• THE ASTROMETRY IS GENERALLY BETTER FOR PLATE
  PAIRS HAVING SAME AREA AND DIFFERENT COLOR
  IRRESPECTIVE OF OBJECT CLASSIFICATION
• THE PHOTOMETRY APPEARS VERY CONSISTENT
  IRRESPECTIVE OF CLASSIFICATION. ON PAIRS OF
  EQUAL-BANDPASS PLATES THE AVERAGE ERROR (IN THE
  DIFFERENCE) IS 0.3 MAG

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Summary Notes (continues)

• AS EXPECTED, THE MEAN VALUES IN ??, ?? AND (?
  mag) ARE CENTERED AROUND THE NULL VALUE
• MORE INTERESTING, THE DEVIATIONS OF ??, ?? AND
  (? mag) FROM THEIR MEAN VALUES SHOW THE EXPECTED
  BEHAVIORS FOR THE DIFFRENT CLASSES OF PLATE PAIRS
  (SAME AREA, DIFFERENT AREA, SAME BANDPASS, DIFF.
  BANDPASS, ETC.)
• THIS GLOBAL QA DOES ALLOW THE DETECTION OF
  ANOMALOUS PLATES, AS IT WAS THE CASE FOR G039
  (S020)
• THIS TYPE OF ANALYSIS NEEDS TO BE RE-RUN ON A
  REPRESENTATIVE SET OF PLATES IN THE PRODUCTION DB
  AT ST ScI

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2Mass GSCII Export
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