ETC User Manual

• Welcome
• Release Notes for ETC 33.1
  • New Features
    • General
    • ACS
    • COS
    • STIS
    • WFC3
    • Documentation
    • Under the Hood
  • Resolved Issues
  • Known Issues
• Basic Use
  • Examining the Results
    • Detailed Results
    • Plots and Tables
  • Approximating ETC Results in pysynphot
• Calculations
  • SNR
  • Calculating Time
• Imaging
  • Optimal SNR
• Spectroscopy
  • Specifying the Wavelength
  • Extended Sources
• Target Acquisition
  • COS Target Acquisition
    • Imaging Target Acquisition
    • Spectroscopic Target Acquisition
  • STIS Target Acquisition
• Reference
  • Spectral Distributions
    • Castelli & Kurucz Models
    • Pickles Models
    • Kurucz Models
    • Bruzual Spectra
    • HST Standard Star spectra
    • PHOENIX M dwarf Models
    • Non-Stellar Spectra
    • Black-body
    • Power-law
    • Flat continuum
  • Castelli & Kurucz Models
    • The Atlas9 Stellar Atmosphere Models by Castelli and Kurucz 2004
  • Pickles Models
    • A Stellar Spectral Flux Library By A.J. Pickles (1998) (PASP 110, 863)
  • Other Spectra
  • Available Spectra Which Cannot be Used Directly by the ETC
    • The Complete Set of HST Standard Spectra (CALSPEC and CALOBS)
  • User-Supplied Spectra
    • Prepare your file
    • Spectrum File Format
    • Specify your spectrum
  • E(B-V) and the Interstellar Extinction Curves
  • Redshift
  • Normalizing the Source Flux
  • Adding Emission Lines
    • Using pysynphot to modify emission lines
  • SNR/Time Calculations at emission lines
  • Specifying the Appropriate Background
    • External Background
    • Thermal Background and Noise
  • CCD parameters
    • Postflash
    • Gain
    • ACS CCD Parameters
    • Quantum Yield correction for CCD detection of UV photons
    • STIS CCD Parameters
    • WFC3 CCD Parameters
  • Extraction Regions
  • The ETC Request ID
    • Retrieving Previous Calculations
• Appendix B - instruments
  • ACS Filters and Dispersers
    • HRC Filters
    • SBC Filters
    • WFC Filters
    • Ramp Filters
  • COS Dispersers
  • COS Dark current
  • COS FP-POS
  • Calculations with BOA at wavelengths shorter than 1200 Å
  • Wavelength dependence on the Exposure Times and S/N calculated by the ETC for the G130M/1055 and G130M/1096 Settings due to changing resel size.
  • COS Tables
    • Detector Count Rate Restrictions
    • COS Count Rate Screening Limits
    • Detector Dark Background
    • Detector background count rates (per second) for COS
  • STIS Filters and Dispersers
    • Comparisons of Imaging Mode Throughputs
    • Choosing a filter for imaging observations or slitless spectroscopy
  • STIS Brightest Pixel EE table with narrow slits
  • STIS Modes
    • Selecting a Slit/Filter
    • Plate Scales for Different Gratings
    • Detector Countrate Restriction
    • CCD Saturation Limits
    • MAMA Countrate Restrictions for Different Modes
    • Detector Binning
    • Detector Background
    • Selecting a Checkbox Size for STIS Target Acquisitions
  • WFC3IR Minimum Exposure Times and Subarrays
  • WFC3 Filters and Dispersers
    • WFC3 UVIS Filters and Grism
    • WFC3 IR Channel Filters and Grisms
  • WFC3 Scan Mode
• Appendix C - Browser Issues