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HST Data Handbook for WFC3 Version 1.0 January 2009 HST Data Handbook for WFC3 Space Telescope Science Institute 3700 San Martin Drive Baltimore, Maryland 21218 [email protected] Operated by the Association of Universities for Research in Astronomy, Inc., for the National Aeronautics and Space Administration User Support For prompt answers to any question, please contact the STScI Help Desk. • E-mail: [email protected] • Phone: (410) 338-1082 or 1-800-544-8125 World Wide Web Information and other resources are available on the WFC3 World Wide Web page: • URL: http://www.stsci.edu/hst/wfc3 WFC3 Revision History Version Date Editor 1.0 January 2009 Jessica Kim Quijano, Howard Bushouse, and Susana Deustua HST Introduction (v7.0) Editors: Brittany Shaw, Jessica Kim Quijano, & Mary Elizabeth Kaiser HST Introduction Technical Editors: Susan Rose & Jim Younger Authorship This document is written and maintained by the WFC3 Team in the Instruments Division of STScI, with contributions from former members (Howard Bond, Tom Brown, and Massimo Robberto), as well as the Space Telescope European Coordinating Facility, and Randy Kimble from Goddard Space Flight Center. The WFC3 Team, at the time of this writing, consists of Sylvia Baggett, Tiffany Borders, Howard Bushouse, Michael Dulude, Susana Deustua, Linda Dressel, George Hartig, Bryan Hilbert, Jason Kalirai, Jessica Kim Quijano, John MacKenty, Peter McCullough, Cheryl Pavlovsky, Larry Petro, Vera Khozurina-Platais, Abhijith Rajan, and Adam Riess. In publications, refer to this document as: Kim Quijano, J., et al. 2009, “WFC3 Mini-Data Handbook”, Version 1.0, (Baltimore: STScI). Acknowledgments Former Science IPT Members Wayne Baggett Ron Henry Howard Bond Pat Knezek Tom Brown Ray Kutina Laura Cawley Casey Lisse Ed Cheng (GSFC, now Conceptual Analytics) Olivia Lupie Ilana Dashevsky Neill Reid Don Figer Massimo Robberto Mauro Giavalisco Michael Robinson Shireen Gonzaga Megan Sosey Christopher Hanley Massimo Stiavelli Thanks The editors thank Helmut Jenkner and Jennifer Mack for their contributions. We also thank the Technical Editor, Susan Rose, for her contributions to the editing and production of this Data Handbook. Send comments or corrections to: Space Telescope Science Institute 3700 San Martin Drive Baltimore, Maryland 21218 E-mail:[email protected] iv : Table of Contents Preface .....................................................................................xi Part I: Introduction to Reducing HST Data................................................................................. 1 Chapter 1: Obtaining HST Data ............................................. 1-1 1.1 Archive Overview ....................................................... 1-1 1.1.1 Archive Processing.................................................. 1-2 1.1.2 Archive Registration................................................. 1-4 1.1.3 Archive Documentation and Help ............................ 1-4 1.2 Obtaining Data via the MAST Web........................ 1-5 1.2.1 MAST Overview....................................................... 1-5 1.2.2 Hubble Legacy Archive.......................................... 1-11 1.2.3 High-Level Science Products ................................ 1-16 1.3 Obtaining Data with StarView ............................... 1-17 Chapter 2: HST File Formats............................. 2-1 2.1 HST Data Files ........................................................... 2-1 2.2 Multi-Extension FITS File Format........................... 2-3 2.2.1 Working with Multi-Extension FITS Images in IRAF ......................................................................... 2-4 2.2.2 Working with FITS Table Extensions....................... 2-9 2.3 GEIS File Format...................................................... 2-12 2.3.1 Converting Waiver FITS to GEIS........................... 2-13 2.3.2 GEIS Data Groups................................................. 2-14 2.3.3 Working with GEIS Files........................................ 2-15 2.3.4 The waiver FITS Format........................................ 2-18 v vi Table of Contents Chapter 3: Analyzing HST Data ...................... 3-1 3.1 Analysis Options for HST Data ............................... 3-1 3.1.1 IRAF/STSDAS......................................................... 3-1 3.1.2 PyRAF..................................................................... 3-2 3.1.3 Python...................................................................... 3-2 3.1.4 Interactive Data Language (IDL) ............................. 3-3 3.1.5 Fortran and C........................................................... 3-3 3.1.6 Java ......................................................................... 3-3 3.2 Navigating STSDAS .................................................. 3-4 3.2.1 STSDAS Structure................................................... 3-4 3.2.2 Packages of General Interest .................................. 3-6 3.3 Displaying HST Images ............................................ 3-7 3.3.1 The Display Task..................................................... 3-7 3.3.2 Working with Image Sections ................................ 3-11 3.4 Analyzing HST Images ........................................... 3-13 3.4.1 Basic Astrometry.................................................... 3-13 3.4.2 Examining and Manipulating Image Data.............. 3-15 3.4.3 Working with FITS Imsets...................................... 3-16 3.4.4 Photometry ............................................................ 3-19 3.4.5 Combining Dithered HST Datasets with MultiDrizzle ......................................................... 3-24 3.5 Displaying HST Spectra ......................................... 3-25 3.5.1 Specview ............................................................... 3-25 3.5.2 COS and STIS Spectra ......................................... 3-26 3.5.3 FOS and GHRS Spectra........................................ 3-28 3.5.4 Producing Hardcopy .............................................. 3-29 3.6 Analyzing HST Spectra........................................... 3-31 3.6.1 Preparing COS and STIS Spectra for Analysis in IRAF or PyRAF and STSDAS................................ 3-31 3.6.2 Preparing FOS and GHRS Data............................ 3-34 3.6.3 Photometry ............................................................ 3-37 3.6.4 General Tasks for Spectra..................................... 3-37 3.6.5 STSDAS Fitting Package ...................................... 3-41 3.6.6 Specfit.................................................................... 3-43 3.7 References ................................................................ 3-44 3.7.1 Available from STScI ............................................. 3-44 3.7.2 Available from NOAO ............................................ 3-44 3.7.3 Other References Cited in This Chapter ............... 3-45 Table of Contents vii Part II: WFC3 Data Handbook......................................... 1 Introduction ......................................................................... 3 Chapter 1: WFC3 Overview................................. 1-1 1.1 Instrument Overview ................................................. 1-1 1.1.1 The UVIS Channel................................................... 1-4 1.1.2 The IR Channel ....................................................... 1-5 Chapter 2: WFC3 Data Structure ................... 2-1 2.1 Types of WFC3 Files................................................. 2-1 2.1.1 Data Files and Suffixes............................................ 2-2 2.1.2 Auxiliary Data Files.................................................. 2-4 2.2 WFC3 File Structure.................................................. 2-6 2.2.1 UVIS Channel File Structure ................................... 2-6 2.2.2 IR Channel File Structure ........................................ 2-8 2.2.3 Contents of Individual Arrays................................. 2-11 2.3 Data Storage Requirements.................................. 2-13 2.4 Headers and Keywords .......................................... 2-14 Chapter 3: WFC3 Basic Calibration ............ 3-1 3.1 Calibration Overview ................................................. 3-1 3.1.1 Image Processing Summary.................................... 3-2 3.2 Overview of calwf3..................................................... 3-3 3.2.1 Structure and Processing Flow................................ 3-3 3.2.2 UVIS Processing...................................................... 3-6 3.2.3 IR Processing .......................................................... 3-8 3.2.4 Running calwf3 ........................................................ 3-9 3.3 Keyword Usage ........................................................ 3-11 3.4 Description of Calibration Steps ........................... 3-13 3.4.1 wf3ccd.................................................................... 3-14 3.4.2 wf32d ..................................................................... 3-19 3.4.3 wf3ir ....................................................................... 3-23 3.4.4 wf3rej ..................................................................... 3-31 3.5 Calibration of WFC3 Spectroscopic Data........... 3-35 viii Table of Contents Chapter 4: WFC3 Images: Distortion Correction and MultiDrizzle .......................... 4-1 4.1 WFC3 Geometric Distortion..................................... 4-1 4.1.1 The UVIS Channel................................................... 4-2 4.1.2 The IR Channel ......................................................
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