Wide Field Camera 3 Instrument Handbook for Cycle 19 - Space ...

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22 Chapter 3: Choosing the Optimum HST Instrument Figure 3.3: Discovery efficiencies of optical/infrared HST imaging instruments, including those verified on-orbit for WFC3. Discovery efficiency is defined as the system throughput (plotted in Figure 3.2) multiplied by the area of the field of view. Note that the y-axis is now logarithmic. HST Survey Discovery Efficiency Throughput x Area (arcsec 2 ) 10000 1000 WFC3/UVIS ACS/WFC WFC3/IR NICMOS/NIC3 100 200 300 400 500 700 1000 2000 Wavelength (nm) Figure 3.4: Limiting point-source magnitudes reached by optical/infrared HST imaging instruments in 10 hours. 30 29 HST - Limiting Magnitude in 10 Hours WFC3/UVIS ACS/WFC WFC3/IR ABMAG 28 NICMOS/NIC3 27 Point Sources (Optimal Extraction) 200 300 400 500 700 1000 2000 Wavelength (nm)
Comparison of WFC3 with Other HST Imaging Instruments 23 Figure 3.5: Time needed for optical/infrared HST imaging instruments to survey a wide sky area to a limiting extended (1 arcsec 2 ) ABMAG of 26. HST - Time to Survey 100 arcmin 2 to ABMAG=26 10 4 WFC3/UVIS ACS/WFC WFC3/IR Time (sec) 10 5 10 6 NICMOS/NIC3 Extended Sources (1 arcsec 2 ) 10 7 200 300 400 500 700 1000 2000 Wavelength (nm)
Page 1 and 2: Version 3.0 December 2010 Wide Fiel
Page 3 and 4: Table of Contents Acknowledgments .
Page 5 and 6: Table of Contents v 5.5 The WFC3 IR
Page 7 and 8: Table of Contents vii 7.8 IR Sensit
Page 9 and 10: Table of Contents ix Appendix C: Di
Page 11 and 12: xi Past Science IPT Members Elizabe
Page 13 and 14: CHAPTER 1: Introduction to WFC3 In
Page 15 and 16: WFC3 Quick Reference Guide 3 • UV
Page 17 and 18: Sources of Further Information 5 1.
Page 19 and 20: CHAPTER 2: WFC3 Instrument Descript
Page 21 and 22: Figure 2.1: Schematic optical layou
Page 23 and 24: Spectral Elements 11 elongation of
Page 25 and 26: Spectral Elements 13 Figure 2.3: UV
Page 27 and 28: Detector Read-Out Modes and Ditheri
Page 29 and 30: Choosing Between Instruments 17 3.2
Page 31 and 32: 3.3.2 Field of View Comparison of W
Page 33: Comparison of WFC3 with Other HST I
Page 37 and 38: Preparing a Phase I Proposal 25 4.2
Page 39 and 40: 4.2.3 What Aperture or Subarray? Pr
Page 41 and 42: CHAPTER 5: WFC3 Detector Characteri
Page 43 and 44: The WFC3 UVIS Channel CCD Detectors
Page 45 and 46: WFC3 CCD Readout Formats 33 5.3 WFC
Page 47 and 48: WFC3 CCD Characteristics and Perfor
Page 61 and 62: 5.4.12 Crosstalk WFC3 CCD Character
Page 63 and 64: The WFC3 IR Channel Detector 51 Fig
Page 65 and 66: WFC3 IR Readout Formats 53 Figure 5
Page 67 and 68: WFC3 IR Readout Formats 55 Full-fra
Page 69 and 70: WFC3/IR Detector Characteristics an
Page 77 and 78: Specifying a UVIS Observation 65 6.
Page 79 and 80: UVIS Field Geometry 67 Figure 6.1:
Page 81 and 82: 6.4.4 Subarrays and On-Chip Binning
Page 83 and 84: UVIS Field Geometry 71 target at th
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UVIS Spectral Elements 73 6.5 UVIS
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UVIS Spectral Elements 75 Table 6.2
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Figure 6.3: Integrated system throu
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UVIS Spectral Elements 81 UV Filter
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UVIS Spectral Elements 83 Table 6.3
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UVIS Spectral Elements 85 Figure 6.
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6.5.3 Ghosts UVIS Spectral Elements
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UVIS Optical Performance 89 Table 6
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UVIS Optical Performance 91 Figure
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UVIS Optical Performance 93 Table 6
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UVIS Optical Performance 95 Figure
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UVIS Exposure and Readout 97 (1.0,
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UVIS Sensitivity 99 contains 1402×
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6.9.3 Charge-Transfer Efficiency Ot
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UVIS Observing Strategies 103 6.10
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CHAPTER 7: IR Imaging with WFC3 In
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IR Field Geometry 107 The WFC3 IR d
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IR Field Geometry 109 The POS TARG
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IR Spectral Elements 111 Table 7.1:
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IR Spectral Elements 115 Wide-band
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IR Optical Performance 117 Table 7.
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IR Optical Performance 119 Figure 7
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IR Optical Performance 121 Table 7.
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IR Exposure and Readout 123 Inter-p
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IR Exposure and Readout 125 • the
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Table 7.8: Sample times of 1024×10
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IR Sensitivity 129 Table 7.9: Suppo
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Other Considerations for IR Imaging
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IR Observing Strategies 137 sub-pix
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IR Observing Strategies 139 Table 7
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CHAPTER 8: Slitless Spectroscopy wi
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Slitless Spectroscopy with the UVIS
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Slitless Spectroscopy with the IR G
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Slitless Spectroscopy with the IR G
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Sensitivities and Exposure-Time Est
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CHAPTER 9: WFC3 Exposure-Time Calcu
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Calculating Sensitivities from Tabu
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Calculating Sensitivities from Tabu
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Count Rates (Imaging) 157 Table 9.2
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9.4.2 Diffuse Sources Count Rates (
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The S/N ratio Σ achieved in exposu
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Sky Background 163 • I λ is the
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Sky Background 165 Figure 9.1: Sky
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Sky Background 167 Table 9.4: Appro
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Exposure-Time Calculation Examples
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Exposure-Time Calculation Examples
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Observatory Overheads 173 activitie
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Instrument Overheads 175 Table 10.1
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Instrument Overheads 177 IR paralle
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Orbit Use Examples 179 In the IR ch
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Orbit Use Examples 181 Table 10.4:
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Orbit Use Examples 183 Table 10.6:
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APPENDIX A: WFC3 Filter Throughputs
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Throughputs and S/N Ratio Data 187
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% Throughput 30 25 20 15 UVIS/F200L
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% Throughput UVIS/F225W Description
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% Throughput UVIS/F280N Description
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% Throughput UVIS/F350LP Descriptio
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% Throughput UVIS/F390M Description
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% Throughput UVIS/F475X Description
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% Throughput UVIS/F763M Description
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% Throughput UVIS/F850LP Descriptio
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% Throughput UVIS/FQ232N Descriptio
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% Throughput UVIS/FQ422M Descriptio
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% Throughput IR/F098M Description B
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% Throughput IR/F110W Description W
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% Throughput IR/F126N Description [
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% Throughput IR/F128N Description P
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% Throughput IR/F132N Description P
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% Throughput IR /F167N Description
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APPENDIX B: Geometric Distortion In
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UVIS Channel 277 See http://www.sts
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IR Channel 279 Figure B.3: Linear c
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APPENDIX C: Dithering and Mosaickin
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WFC3 Patterns 283 special-purpose m
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WFC3 Patterns 285 Table C.3:Steps i
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APPENDIX D: Bright-Object Constrain
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IR Channel 289 available. To use th
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IR Channel 291 Table D.4: Count Rat
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The STScI Reduction and Calibration
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The STScI Reduction and Calibration
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The SMOV Calibration Plan 297 Propo
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The Cycle 17 Calibration Plan 299 P
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The Cycle 18 Calibration Plan 301 P
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Glossary 303 FGS: Fine Guidance Sen
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Index A ACCUM mode UVIS 96 Aperture
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Index 307 UVIS/FQ634N 242 UVIS/FQ67
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Index 309 comparing HST instruments
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