All-Sky Release Readiness Review

Transcription

1 Wide-field Infrared Survey Explorer (WISE) All-Sky Release Readiness Review February 9, 2011

2 Sky Coverage Dominic Benford February 9, 2011

3 The WISE Sky WISE ASRRR - Coverage 3

4 The WISE Sky WISE ASRRR - Coverage 4

5 The WISE Sky WISE ASRRR - Coverage 5

6 Sky Coverage " Refers to the task of determining what WISE pointed towards during the course of the survey. " What is the total sky coverage of the PR? " 41, square degrees uniquely contained in the 18,240 Atlas Tiles = % " More like 44, square degrees non-unique " Valid pixels: Band Square Degrees % of Sky % Valid W1 41, % 99.99% W2 41, % 99.99% W3 41, % 99.95% W4 41, % 99.xx% WISE ASRRR - Coverage 6

7 Sky Coverage " Depth-of-Coverage means number of times and point was recorded as a valid pixel in the image coaddition phase. " Catalog Source Density means the coverage of extracted sources in a given (nominally small) area. WISE ASRRR - Coverage 7

8 Coverage Task 1." Validation of the Level 1 Science Requirement: "!4 coverages over 95% of the sky " (!8 coverages over ~99% of the sky) " (median coverage ~14) 2." Characterization of the All-Sky Data Release sky coverage " Features/Metrics of the dataset " Oddities of coverage " Explanatory Supplement WISE ASRRR - Coverage 8

9 Characterization of the All-Sky Data Release Sky Coverage Features / Metrics of the Dataset

10 WISE By The Numbers 1 All-Sky Data Release 2 Passes of Processing 4 Mid-IR Bands ~14 Observations (Median) Detector Arrays 18,240 Atlas Tiles on the Sky 2,784,184 Framesets during the Mission 16,769,025 Pixels per Tile per Band ~563,896,176 Catalog Sources 3,670,404,192,000 Pixels Total in All-Sky Release WISE ASRRR - Coverage 10

11 Sky Coverage (ab initio) WISE ASRRR - Coverage 11

12 Sky Coverage (post facto) WISE ASRRR - Coverage 12

13 Typical Tile Coverage WISE ASRRR - Coverage 13

14 Typical Tile Coverage 1 W1 Pass WISE ASRRR - Coverage 14

15 Typical Tile Coverage 1 W1 Pass WISE ASRRR - Coverage 15

16 Typical Tile Coverage 2 W2 Pass WISE ASRRR - Coverage 16

17 Typical Tile Coverage 2 W2 Pass WISE ASRRR - Coverage 17

18 Typical Tile Coverage 3 W3 Pass WISE ASRRR - Coverage 18

19 Typical Tile Coverage 3 W3 Pass WISE ASRRR - Coverage 19

20 Typical Tile Coverage 4 W4 Pass WISE ASRRR - Coverage 20

21 Typical Tile Coverage 4 W4 Pass WISE ASRRR - Coverage 21

22 Wavelength Dependence: int! WISE ASRRR - Coverage 22

23 Wavelength Dependence: unc! WISE ASRRR - Coverage 23

24 Wavelength Dependence: cov! WISE ASRRR - Coverage 24

25 Coverage Data Products " MEDCOV Atlas header value for median coverage " MINCOV Atlas header value for min coverage " MAXCOV Atlas header value for max coverage " NOMCOVPC Atlas header value for % nominal cov=8 " LowCovPc Calculated for % coverage <4 requirement " CovMean Robust mean of coverage per frame " CovSigma Robust standard deviation in coverage " CovHist Histogram of pixel coverages (bins=0.125) " CumHist Cumulative histogram of pixel coverages " UncCov Mean uncertainty vs. coverage WISE ASRRR - Coverage 25

26 Coverage Depth vs. ELat Pass 1 Pass 2 WISE ASRRR - Coverage 9 February

27 Coverage vs. Ecliptic Latitude Calculated CovMean±CovSigma! +1" Mean -1" WISE ASRRR - Coverage 27

28 Coverage vs. Ecliptic Latitude Max FITS Header MINCOV/MEDCOV/MAXCOV! Median Min WISE ASRRR - Coverage 28

29 Coverage Depth (Differential) W1 WISE ASRRR - Coverage 9 February

30 Coverage Depth (Differential) W1 WISE ASRRR - Coverage 9 February

31 Coverage Histograms W1 W2 W3 W4 WISE ASRRR - Coverage 31

32 Coverage Depth Integrated WISE ASRRR - Coverage 9 February

33 Cumulative Coverage W1 W2 W3 W4 WISE ASRRR - Coverage 33

34 Sky Coverage (%, W1) W1 WISE ASRRR - Coverage 34

35 Percentage Covered (linear) Pass 1 Pass 2 WISE ASRRR - Coverage 9 February

36 Sky Coverage (%, W1) W1 WISE ASRRR - Coverage 36

37 Percentage Covered (log) Pass 1 Pass 2 WISE ASRRR - Coverage 9 February

38 Sky Coverage (%) W1 Median ±0.003 W2 Median ±0.004 W3 Median ±0.002 W4 Median ±0.003 WISE ASRRR - Coverage 38

39 Sky Coverage Percentiles Band W1 W2 W3 W4 99.9%!3.99!2.77!0.96! %!8.80!6.74!3.61! %!9.74!8.81!4.56! %!10.82!10.75!9.78! %!11.64!11.58!10.81! %!12.78!12.74!12.17! %!15.65!15.55!14.84! %!23.53!23.30!21.88! %!33.40!33.34!31.86! %!42.43!42.55!41.63! %!73.91!74.15!71.80! %!95.99!96.34!93.52! %!160.62!161.41!162.39! Require ~14 WISE ASRRR - Coverage 39

40 Sky Coverage Depth Band W1 W2 W3 W4 COV= % 0.013% 0.046% 0.026% ± COV< % 0.210% 0.703% 0.513% COV<5 0.14% 0.32% 1.05% 0.73% COV! % 99.24% 97.12% 97.71% 41, , , ,308 2 COV! % 82.13% 75.51% 77.20% 34, , , ,848 2 Require <5% Require >99% WISE ASRRR - Coverage 40

41 Sky Coverage vs. Position Latitude Ecliptic Galactic Equat. lat " lat " lat " lat " lat " lat " lat " lat " lat " lat " lat " lat " lat " WISE ASRRR - Coverage 41

42 Coverage & Uncertainty WISE ASRRR - Coverage 9 February

43 Coverage vs. Uncertainty W1 W2 W3 W4 WISE ASRRR - Coverage 43

44 WISE Sky in W1 WISE ASRRR - Coverage 9 February

45 National Aeronautics The and WISE All Sky (Galactic) WISE ASRRR - Coverage 45

46 National Aeronautics The and WISE All Sky (Galactic) W1 W2 W3 W4 WISE ASRRR - Coverage 46

47 Characterization of the All-Sky Data Release Sky Coverage Oddities of Coverage

48 Things to Understand " Coverage (and hence sensitivity) varies over sky because of survey strategy " Holes in All-Sky Release Atlas Tile coverage: " Due to torque rod gashes " Where there s severe scattered moonlight " At saturated regions " Atlas and Catalog coverage intentionally attenuated in 41 Tiles near Ecliptic poles (full-depth coadds exist, but source extraction left to the user) " Catalog source density suppressed around very bright stars. WISE ASRRR - Coverage 48

49 Polar Tile Overlaps WISE ASRRR - Coverage 49

50 North Ecliptic Pole Coverage (Left) Pass 2 Atlas tile, depth 0-200; (Right) Full-Depth Pass 2 tile, depth WISE ASRRR - Coverage 9 February

51 North Ecliptic Pole Cutouts (Left) Pass 2 Atlas tile, depth ~160; (Right) Full-Depth Pass 2 tile, depth ~3200 WISE ASRRR - Coverage 9 February

52 North Ecliptic Pole Cutouts (Left) Pass 2 Drizzled Image, depth ~3200 (Right) Full-Depth Pass 2 tile, depth ~3200 WISE ASRRR - Coverage 9 February

53 Confused Regions I Confused regions in Pass 1; below is W234 Pass 1 INT Pass 1 COV WISE ASRRR - Coverage 9 February

54 Confused Regions II Confused regions coverage improved in Pass 2! Pass 2 INT Pass 2 COV WISE ASRRR - Coverage 9 February

55 Heavy Saturation I Heavily saturated images leave extended burned out areas and generally muck things up nearby. This is intrinsic to the raw frames and processing can t help much. Pass 1 INT Pass 1 COV WISE ASRRR - Coverage 55

56 Heavy Saturation II Heavily saturated images leave extended burned out areas and generally muck things up nearby. This is intrinsic to the raw frames and processing can t help much. Pass 2 INT Pass 2 COV WISE ASRRR - Coverage 56

57 Moon Gaps I W4, stretched: Moon glow significant; produces gaps in coverage. WISE ASRRR - Coverage 57

58 Moon Gaps II Moon avoidance regions include far-off-axis removal. WISE ASRRR - Coverage 58

59 Moon Gaps III Moon avoidance regions imprint on coverage up to ~30 off ecliptic, in small areas. Pass 1 INT Pass 1 COV WISE ASRRR - Coverage 59

60 Moon Gaps IV Moon avoidance regions imprint on coverage up to ~30 off ecliptic, in small areas. Pass 1 Pass WISE ASRRR - Coverage 60

61 Moon Gaps V Moon avoidance improved! Pass 1 Pass WISE ASRRR - Coverage 9 February

62 Moon Coverage VI Moon avoidance improved! Pass 1 Pass WISE ASRRR - Coverage 9 February

63 Moon Gaps VII W1 W2 Moon avoidance has improved W3 W WISE ASRRR - Coverage 63

64 Moon Gaps VIII W1 W2 Moon avoidance has improved W3 W4 but there is still degradation in some Atlas tiles in a wavelengthdependent way WISE ASRRR - Coverage 64

65 Moon Gaps IX Moon avoidance results in spurious sources (no outlier detection) and gaps, depending on band. INT COV linear WISE ASRRR - Coverage 65

66 Moon Gaps X Moon avoidance results in spurious sources (no outlier detection) and gaps, depending on band. INT COV sqrt WISE ASRRR - Coverage 66

67 Torque Gashes I Low coverage resulting from minor operational issue; occurs near Ecliptic latitude of ±45. 4-band INT 4-band COV Near 95, +45 Ecl WISE ASRRR - Coverage 9 February

68 Torque Gashes II Low coverage = gaps in W1/W2, some outliers pass through. W1 INT W1 COV Near 95, +45 Ecl WISE ASRRR - Coverage 9 February

69 Torque Gashes III Low coverage = more unpleasant effects on background in W3/W4. W3 INT W3 COV Near 95, +45 Ecl WISE ASRRR - Coverage 9 February

70 Bright Stars! I Areas around Bright Stars WISE ASRRR - Coverage 70

71 Areas around Bright Stars Bright Stars II 4-band INT 4-band COV WISE ASRRR - Coverage 9 February

72 Areas around Bright Stars Bright Stars III 4-band INT w/ spatial filter 4-band COV WISE ASRRR - Coverage 9 February

73 Bright Stars IV Area around Betelgeuse W1: catalog sources suppressed within ~1 (less under most lenient selection criteria; more under most draconian); diameter is magnitude-dependent. W1; ccflags=???? W1; ccflags= WISE ASRRR - Coverage 9 February

74 Bright Stars V Area around Betelgeuse W3: catalog sources suppressed within ~1 (less under most lenient selection criteria; more under most draconian); diameter is magnitude-dependent. W3; ccflags=???? W3; ccflags= WISE ASRRR - Coverage 9 February

75 Bright Stars VIII! Area around Betelgeuse, from W2 Pass 1 and W1 Pass 2 showing a clear change in the effect of refined flagging parameters. W2 Pass 1; ccflags=0000 W1 Pass 2; ccflags= WISE ASRRR - Coverage 75

76 Bright Stars VI Done for Pass 1; still to be completed for Pass 2. W1 W2 W3 W4 WISE ASRRR - Coverage 9 February

77 Coverage & Deblending Work Deblending by Nick of sources: Bond, Ken threshold Marsh, set such et al. that <10 separation typically yields 1 source in catalog. Pass 1 Pass 2 WISE ASRRR - Coverage 9 February

78 Explanatory Supplement Very Similar to What You See Here.

79 Sky Coverage Backups on Requirements Verification

80 Sky Coverage (%, W1) W1 WISE ASRRR - Coverage 80

81 Verification of Requirement WISE ASRRR - Coverage 81

82 Verification of Requirement Yes! ~50x margin at W1 WISE ASRRR - Coverage 82

83 Verification of Requirement Yes! ~50x margin at W1 WISE ASRRR - Coverage 83