PetroFit

PetroFit is a package for calculating Petrosian properties, such as radii and concentration indices, as well as fitting galaxy light profiles. This package includes tools for performing accurate photometry, segmentations, Petrosian properties and fitting. This documentation is intended to serve as a description and guide to the petrofit module.

PetroFit is built on the Photutils package.

Fundamentals

• Installation
  • pip
  • Conda
  • Docker
  • For Developers
• Introduction
  • Sersic Profiles
    • Ellipticity and Elongation
    • Input Raidus
    • Sersic Index
    • Effective Radius and Intensity
    • Curve of Growth
  • Petrosian Profiles
    • Discrete Computation
    • Petrosian Radius and Eta
    • Petrosian Total Flux Radius and Epsilon
    • Petrosian Half Light Radius
    • Concentration Index
    • Petrosian Corrections
  • List of Galaxy Properties
  • References
• Photometry
  • Loading Example Data
    • Estimate data noise at dark area
  • Catalogs
    • Make Catalog
    • Plotting Segmentation Maps
  • Photometry on Single Source
    • Source Selection
    • Aperture Radii
    • Photometry Calculation
    • Save Photometry Arrays
• Petrosian
  • Construct Petrosian from Photometry
  • Petrosian Radii
    • Petrosian Radius
    • Petrosian Total Flux Radius
    • Petrosian Half-Light Radius
    • Fraction of Flux Radius
    • Concentration Index
    • Total Petrosian Flux
  • Petrosian Plots
    • Profile Plot
    • Image Overplot
    • Change eta and epsilon
  • Petrosian Corrections
    • Load Correction Grid
    • Estimate Sersic Index
    • Estimate Corrected Epsilon
    • Corrected Petrosian
    • Corrected Petrosian Total Flux
• Fitting
  • Loading Example Data
    • Loading Image
  • Make Source Catalog
  • Single Source Photometry
  • Petrosian Profile
  • Estimating Sersic Parameters
    • Center Pixel
    • Ellipticity and Elongation
    • Source Orientation
    • Sersic Index
    • Half-Light Radius (r_eff)
    • Amplitude at r_eff
  • Zoom and Mask Image
  • AstroPy Sersic Model
  • PSFModel
    • PSF
    • Oversampling
    • Create PetroFit Model
    • PSF Rotation
    • Accessing the Underlying Model
  • Fitting Models
  • Generate Model Image
  • Estimated vs. Fitted Parameters
  • Galaxy vs. Model Profiles
    • Petrosian Radii Comparison
    • Total Flux Comparison

Advanced

• Multi-object Photometry
  • Loading Example Data
  • Make Source Catalog
  • Photometry Loop
  • Compute Total Mags
  • Photometry Catalog
• Simultaneous Fitting
  • Make Individual Models
  • Make Compound Model
  • Make PSFModel
  • Fit Model to Data
  • Generate Model Image
  • Analysis of Background

Developer

• API
• Correction Girds
• Release Procedure