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

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6 Chapter 1: Introduction to WFC3 1.6 The WFC3 Instrument Team at STScI STScI’s team of Instrument Scientists, Data Analysts, Engineers, and Scientific Programmers support the design, development, operation, calibration, and documentation of WFC3. STScI also maintains a “Help Desk” to provide answers quickly to any WFC3- and HST-related questions. Please refer all questions regarding WFC3 and HST to the Help Desk, as follows: • E-mail: help@stsci.edu • Phone: (410) 338-1082 The Team Lead for WFC3 is John Mackenty: • E-mail: mackenty@stsci.edu • Phone: (410) 338-4559 Additional STScI contact info can be found in the Cycle 19 Call for Proposals.
CHAPTER 2: WFC3 Instrument Description In this chapter . . . 2.1 Optical Design and Detectors / 7 2.2 Field of View and Geometric Distortions / 10 2.3 Spectral Elements / 11 2.4 Detector Read-Out Modes and Dithering / 15 2.1 Optical Design and Detectors The optical design of WFC3 was driven by the need to provide a large field of view and high sensitivity over a broad wavelength range, excellent spatial resolution, and stable and accurate photometric performance. WFC3 features two independent imaging cameras: the UV/Visible channel (UVIS) and the near-infrared channel (IR). Figure 2.1 shows a schematic diagram of the instrument’s optical and mechanical layout. On-axis light coming from the HST optical telescope assembly (OTA) is intercepted by the flat 45° WFC3 pick-off mirror (POM) and is directed into the instrument. For IR observations, the channel select mechanism (CSM) then diverts the light into the IR channel; for UVIS observations, the CSM mirror is simply removed, which allows the light to enter the UVIS channel. Because of this design, only a single channel, either UVIS or IR, can be used at any one time, although it is possible to switch between them fairly quickly. Optical elements in each channel (anamorphic aspherical correctors) correct separately for the ~1/2 wave spherical aberration of the HST primary mirror. Both channels also have internal flat-field illumination sources. WFC3 uses two different types of detectors. The UVIS channel uses two butted 4096×2051 thinned, back-illuminated e2v Ltd. (formerly Marconi) CCD detectors to support imaging between 200 and 1000 nm. The IR channel uses a 1024×1024 7
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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: Sources of Further Information 5 1.
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
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
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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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