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

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xii Acknowledgments John T. Trauger, Jet Propulsion Laboratory Alistair R. Walker, Cerro Tololo Interamerican Observatory Bradley C. Whitmore, Space Telescope Science Institute Rogier A. Windhorst, Arizona State University Erick T. Young, University of Arizona Thanks The editor thanks the authors who prepared major revisions regarding on-orbit performance evaluation and provided information to support proposal preparation: Sylvia Baggett (Chapter 5), Howard Bushouse (Chapters 7, 8), Ron Gilliland (Chapters 5, 6), Knox Long (Chapters 7, 9, Appendix D), and Larry Petro (Chapters 6, 7). Many others provided valuable assistance. Contributions to earlier editions were made by past and present members of the Science IPT and by ECF scientists Martin Kümmel, Harald Kuntschner, and Jeremy Brett. The contributions of Susan Rose (Senior Technical Editor) to the editing and production of this Instrument Handbook are greatly appreciated.
CHAPTER 1: Introduction to WFC3 In this chapter . . . 1.1 Overview / 1 1.2 Key Features of WFC3 / 2 1.3 WFC3 Quick Reference Guide / 3 1.4 Special Considerations for Cycle 19 / 4 1.5 Sources of Further Information / 5 1.6 The WFC3 Instrument Team at STScI / 6 1.1 Overview The Wide Field Camera 3 (WFC3) is a fourth-generation imaging instrument. It was installed in the Hubble Space Telescope (HST) during Servicing Mission 4 (SM4) in May 2009. WFC3 saw first light on June 24, 2009, following the cooling of its detectors. Servicing Mission 4 Observatory Verification (SMOV) activities were completed in late August 2009, and were followed by the Cycle 17 calibration and science programs. This WFC3 Instrument Handbook has been prepared by the WFC3 team at STScI. It is the basic technical reference manual for WFC3 observers. The information in this Handbook is intended to be useful for Cycle 19 Phase I proposers, for the subsequently selected General Observers (GOs) as they prepare their Phase II specifications, and for those analyzing WFC3 data. The HST Primer and the HST Call for Proposals also contain valuable information for proposers, and the Call for Proposals is the final authority on HST policy. This edition of the WFC3 Instrument Handbook (Version 3) was written at the end of the execution of the Cycle 17 calibration plan. It supersedes Version 2.1, and includes results from analysis of the first year of on-orbit performance. The WFC3 instrument occupies HST’s radial scientific-instrument bay, from where it obtains on-axis direct images. During SM4 the shuttle astronauts installed WFC3 in place of the long-serving Wide Field Planetary Camera 2 (WFPC2). WFPC2, in turn, was installed during SM1 in December 1993, to replace the original Wide 1
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: xi Past Science IPT Members Elizabe
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 and 34: Comparison of WFC3 with Other HST I
Page 35 and 36: 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
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The WFC3 IR Channel Detector 51 Fig
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WFC3 IR Readout Formats 53 Figure 5
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WFC3 IR Readout Formats 55 Full-fra
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WFC3/IR Detector Characteristics an
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Specifying a UVIS Observation 65 6.
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UVIS Field Geometry 67 Figure 6.1:
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6.4.4 Subarrays and On-Chip Binning
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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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