The WFIRST Galaxy Survey Exposure Time Calculator

This document describes the exposure time calculator for the Wide-Field Infrared Survey Telescope (WFIRST) high-latitude survey. The calculator works in both imaging and spectroscopic modes. In addition to the standard ETC functions (e.g. background and SN determination), the calculator integrates over the galaxy population and forecasts the density and redshift distribution of galaxy shapes usable for weak lensing (in imaging mode) and the detected emission lines (in spectroscopic mode). The source code is made available for public use.

[1]  Michele Cirasuolo,et al.  A large Hα survey at z = 2.23, 1.47, 0.84 and 0.40: the 11 Gyr evolution of star-forming galaxies from HiZELS , 2012, 1202.3436.

[2]  D. Sobral.  A large, multi-epoch H-alpha survey at z=2.23, 1.47, 0.84 & 0.40: the 11Gyr evolution of star-forming galaxies from HiZELS , 2012 .

[3]  T. Lauer,et al.  Wide-Field Infrared Survey Telescope (WFIRST) Interim Report , 2011, 1108.1374.

[4]  Christopher Hirata,et al.  OPTIMAL LINEAR IMAGE COMBINATION , 2011, 1105.2852.

[5]  Michael J. Sholl,et al.  Science Yield of an Improved Wide Field Infrared Survey Telescope (WFIRST) , 2011, 1105.0959.

[6]  Portsmouth,et al.  Empirical Hα emitter count predictions for dark energy surveys , 2009, 0911.0686.

[7]  Christopher Hirata,et al.  Findings of the Joint Dark Energy Mission Figure of Merit Science Working Group , 2009, 0901.0721.

[8]  M. Halpern,et al.  FIVE-YEAR WILKINSON MICROWAVE ANISOTROPY PROBE OBSERVATIONS: LIKELIHOODS AND PARAMETERS FROM THE WMAP DATA , 2008, 0803.0586.

[9]  Craig Oison.  Lens Performance Budgeting Using the Hopkins Ratio , 2008 .

[10]  N. Barron,et al.  Subpixel Response Measurement of Near‐Infrared Detectors , 2006, astro-ph/0611339.

[11]  J. Brinkmann,et al.  Systematic errors in weak lensing: application to SDSS galaxy-galaxy weak lensing , 2005, astro-ph/0501201.

[12]  Shane Jacobson,et al.  Detectors for the James Webb Space Telescope Near‐Infrared Spectrograph. I. Readout Mode, Noise Model, and Calibration Considerations , 2007, SPIE Astronomical Telescopes + Instrumentation.

[13]  B. Draine.  INTERSTELLAR DUST GRAINS , 2003, astro-ph/0304489.

[14]  B. Draine.  Scattering by Interstellar Dust Grains. I. Optical and Ultraviolet , 2003, astro-ph/0304060.

[15]  G. Bernstein,et al.  Shapes and Shears, Stars and Smears: Optimal Measurements for Weak Lensing , 2001, astro-ph/0107431.

[16]  J. Weingartner,et al.  Dust Grain Size Distributions and Extinction in the Milky Way, LMC, and SMC , 2000, astro-ph/0008146.

[17]  L. Colina,et al.  The 0.12-2.5 micron Absolute Flux Distribution of the Sun for Comparison With Solar Analog Stars , 1996 .

[18]  E. Greisen,et al.  The NRAO VLA Sky Survey , 1996 .