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Foreground Data

Foregrounds: Derived Diffuse Components

The product table below offers maps of individual physical components derived from data through the use of a variety of algorithms. Included in this list are Planck and WMAP estimates of synchrotron, free-free, AME (anomalous microwave emission, often attributed to spinning dust), and thermal dust microwave emission, several reddening estimates and line emission maps. Additional pages related to diffuse emission are also available:

  • An Overview of diffuse astrophysical foreground components typically observed at microwave frequencies.
  • Diffuse Emission survey data of Galactic foregrounds (e.g. Haslam, HI maps).
  • Software which may be used to model diffuse emission
  • Images of some of the survey and derived products.

Click on Product, Component or Release Date to sort by that column.

DERIVED DIFFUSE ASTROPHYSICAL COMPONENT MAPS
Product Component Release
Date
Description
Planck DR2 Astrophysical Component Maps
PLA, ADS
AME, Synchroton, Free-Free, Thermal Dust, Line Emission 2015 Parametric Component Separation using combined Haslam, WMAP and Planck DR2 maps Intensity and Polarization.
Planck DR1 Astrophysical Component Maps
PLA, ADS
AME, Synchroton, Free-Free, Thermal Dust, Line Emission 2013 Parametric Component Separation using combined Haslam, Planck DR1 Intensity maps.
WMAP 9yr Max Entropy Method Foreground Emission Maps
AME, Synchrotron, Free-Free, Thermal Dust 2013 Maps of foreground AME, synchrotron, free-free and dust emission for each of the five frequencies using the maximum entropy method.
WMAP 9yr MCMC-Chain Foreground Maps, Model g
AME, Synchrotron, Free-Free, Thermal Dust 2013 Maps of foreground AME, synchrotron, free-free and dust emission using MCMC chain fitting technique that allows a slightly steepened synchrotron spectral index.
Reddening (E(B-V)) Map (Schlegel, Finkbeiner & Davis)
E(B-V) 2003 Reddening map derived from IRAS and COBE data.
Reddening (E(B-V)) Map(Schlafly et al. 2014)
E(B-V) 2014 Reddening map derived from Pan-STARRS1 stellar photometry.
Reddening (E(B-V)) Map (Green et al. 2015)
E(B-V) 2015 Reddening map derived from Pan-STARRS1 and 2MASS stellar photometry.
Planck Reddening Map, Data Release 1
E(B-V) 2013 Reddening map derived from Planck Data Release 1.
Reddening (E(B_V)) Map (Lenz et al. 2017)
E(B-V) 2017 Reddening map derived from HI4PI data and the SFD 2003 reddening map.
Parkes RRL Survey
Jodrell Bank
Free-Free 2015 Free-free emission in the Galactic plane derived from HIPASS Galactic Plane Radio Recombination Line Survey data. (Alves et al 2015)
DMR Galactic Emission Sky Maps
Synchrotron, Free-Free, Thermal Dust 1998 DMR decomposition, prior to knowledge of anomalous microwave emission (AME).
Model Dust Map (Finkbeiner, Davis & Schlegel)
Thermal Dust 2003 Predicted dust map at 94 GHz.
FIRAS Line and Dust Spectrum Maps
Thermal Dust, Line Emission 1998 FIRAS derived intensity in each of 18 emission lines, maps of Galactic thermal dust temperature and optical depth, dust continuum spectra.
A service of the HEASARC and of the Astrophysics Science Division at NASA/GSFC
Goddard Space Flight Center, National Aeronautics and Space Administration
HEASARC Director: Dr. Alan P. Smale
LAMBDA Director: Dr. Eric R. Switzer
NASA Official: Dr. Eric R. Switzer
Web Curator: Mr. Michael R. Greason