Fitting

WHAT'S NEW | WATCH OUT

Top | All | Intro | Scripts | Fitting | Plotting | Statistics | Simulations | Miscellaneous || CIAO | ChIPS | PSFs with ChaRT | Proposal

Sherpa provides extensive facilities for modeling and fitting data. The topics here range from basic fits using source spectra and responses to more advanced areas, such as simultaneous fits to multiple data sets, accounting for the effects of pileup, and fitting spatial and grating data.

Before fitting ACIS spectral data sets with limited pulse-height ranges, please read the CIAO caveat "Spectral analyses of ACIS data with a limited pulse-height range."

Spectral (1-D) Data
- Introduction to Fitting PHA Spectra
- Changing the grouping scheme of a data set within Sherpa (15 Dec 2011)
- Introduction to Fitting ASCII Data with Errors: Single-Component Source Models
- Simultaneously Fitting Two Data Sets
- Fitting a PHA Data Set with Multiple Responses (6 Jan 2012)
- Simulating X-ray Spectral Data (PHA): the fake_pha command (14 Mar 2012)
- Simulating Chandra ACIS-S Spectra with Sherpa (15 Dec 2011)
- Simulating Chandra ACIS-S LETG Spectra with Sherpa (15 Dec 2011)
- Simulating IXO/CAT Spectra with Sherpa (15 Dec 2011)
- Simulating NuSTAR X-Ray Spectra with Sherpa (15 Dec 2011)
- Fitting PHA Data with Multi-Component Source Models
- Calculating Uncertainties by Simulating Flux Distributions (15 Dec 2011)
- Simultaneously Fitting Source and Background Spectra (15 Dec 2011)
- Using A Pileup Model
- Sherpa User Models
- Sherpa Table Models (15 Dec 2011)
- Sherpa Template Models (17 Jan 2012)
- Creating an Input Spectrum for Running MARX Simulations
- Bayesian Analysis in Sherpa (15 Dec 2011)
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 (08 Feb 2012)
- 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.
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 (15 Dec 2011)

Fitting

Spectral (1-D) Data

Spatial (2-D) Data

Grating Data

Generic Data