Fitting

Spectral (1-D) Data

• Introduction to Fitting PHA Spectra
• Changing the grouping scheme of a data set within Sherpa
• Simultaneously Fitting Two Data Sets
• Fitting a PHA Data Set with Multiple Responses
• Simulating X-ray Spectral Data (PHA): the fake_pha command
• Simulating Chandra ACIS-S Spectra with Sherpa
• Simulating Chandra ACIS-S LETG Spectra with Sherpa
• Simulating NuSTAR X-Ray Spectra with Sherpa
• Fitting PHA Data with Multi-Component Source Models
• Calculating Uncertainties by Simulating Flux Distributions
• Calculating Model Flux and Flux Uncertainty
• Simultaneously Fitting Source and Background Spectra
• Using A Pileup Model
• Sherpa User Models
• Sherpa Table Models
• Sherpa Template Models
• Creating an Input Spectrum for MARX and ChaRT Simulations
• Bayesian Analysis in Sherpa
• Using XSpec User Models in Sherpa

Spatial (2-D) Data

• Fitting FITS Image Data
• Radial and elliptical profiles of Image Data
• Using an Exposure Map in Fitting Image Data
• Accounting for PSF Effects in 2D Image Fitting
• Fitting Image Data with Convolved and Unconvolved Model Components
• See also: the Obtain and Fit a Radial Profile CIAO thread
• Sherpa User Models

Grating Data

Users interested in conducting wavelength analysis are encouraged to learn the limitations associated with the set_analysis command before doing so with the information contained in these threads.

• Fitting Grating Data
• Fitting Multiple Orders of HRC-S/LETG Data
• Measuring Line Parameters with an HETG/ACIS-S Spectrum
• Measuring Line Parameters with an LETG/ACIS-S Spectrum

Generic Data

These threads involve data analysis which is not specific to X-ray spectral or spatial modeling, therefore they can be followed using simple ASCII files as input, or other non-X-ray data.

• Introduction to Fitting ASCII Data with Errors: Single-Component Source Models
• CIAO thread: Obtain and Fit a Radial Profile
• Sherpa User Models
• Sherpa Table Models