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Reading a Spectrum's FITS
Algorithms
Overview
Reading Image files
Object Detection & Classification on Direct Images
NICMOSlook
Calnic C
SExtractor
Verify Object Significance
Grism Image Object Identification
Background Subtraction
Variations in Background
Interpolated Background Subtraction
Pre-Defined Background Subtraction
Pre-launch model of Background
Current Background Estimates
Spectra Extraction
Wavelength Calibration and distortions
Description of grisms
Dispersion Relation
Distortion Model
Flux and Error Bars
Extraction Weights
Weights for Point Sources
Weights for Extended Objects
Flatfielding of Spectra
Flux Calibration
Method
Response Files
Deblending Overlapping Objects
Identification of overlapping spectra
Computation of Contamination
Correction for Contamination
Error estimates
Unsolvable cases
Example
Using Deblending
Total Error Estimate
Correction of Spectra for the Pixel Response Function
The Location of Spectra and the Response Function
Correction of Extracted Spectra
Characterization of extracted Spectra
Introduction
Line Searches
Continuum
Broad Absorption Features
Spectral FITS files Format
Wolfram Freudling
5/29/1999
