Compton-y Map from Planck HFI Data (v1)
We provide a map of the Compton-y parameter over roughly one-quarter
of the sky, constructed using data from the nominal mission maps
of the Planck High-Frequency Instrument.
The methodology is described
in Hill & Spergel (2014).
Brief notes (see the paper for full details):
The Internal Linear Combination (ILC) techniques used to make the map
explicitly remove contamination from the CMB and preserve the thermal
SZ signal. Amongst the various other sources
of contamination, the ILC is primarily focused on removing
contamination due to extragalactic dust emission from the Cosmic
Infrared Background, which is the largest contaminant to our CMB
lensing cross-correlation measurement. Galactic dust
emission and some level of emission from unresolved radio and infrared
sources will also be present in this map (note that the associated
mask covers essentially all resolved Planck sources). Keeping these
caveats in mind, we anticipate that this map could be useful for
additional cross-correlation studies, as long as potential
contamination and leakage issues are carefully treated. Thus, we make
the Compton-y map and its associated mask available here
in HEALPix format (these are
FITS files at HEALPix resolution Nside=2048) under the condition that
you cite the above paper when using the map in any scientific analyses.
Compton-y map
y-map mask (unapodized)
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contact: jch at ias dot edu
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