Dust Correction Maps

Retrieve Data

Peek & Graves 2010 correction maps are now online
[Notice of Correction: in Peek & Graves 2010, ApJ, 719, 415, the Figure 6 caption conveys the wrong sense for the map shown. 'subtracted' should instead be 'added'.]
To get corrected extinctions, you need the orginal SFD98 software and maps as well as the software and maps listed on this page. Please e-mail Josh Peek once you download the correction maps and software, so we can then send you information on updates.

Data

There are two additional data products that come from Peek & Graves 2010. The first is the correction map to the SFD98 maps in the northern Galactic cap SDSS DR7 spectroscopic area. The second is the estimated error in that map. The details of these maps are described in the paper. We have also included the simply corrected SFD map for the NGP.

Map File name Description Download file
Correction PG_dust_4096_ngp.fits Correction to SFD E(B-V) map Right click / option-click; choose "Save As..." to download
Errors PG_err_4096_ngp.fits 1-sigma statisitcal errors in the Correction map Right click / option-click; choose "Save As..." to download
Corrected NGP map SFD_dust_4096_ngp_PG10corr.fits A corrected version of SFD_dust_4096_ngp_PG10.fits Right click / option-click; choose "Save As..." to download

Software

There are two ways to access the data. The first is using an IDL code. You must install the orginal SFD98 software and maps before using this code. The code is simply a modified version of dust_getval.pro, with additional keywords available to invoke the Peek and Graves 2010 corrections. The original functionality of the SFD98 dust_getval.pro code is fully maintained. Note that the corrections are by default NOT APPLIED when using this version of dust_getval.pro, and the "PG10" keyword must be set to apply the Peek and Graves 2010 corrections. The simpler, but perhaps more confusing way to implement the corrections is to replace your copy of SFD_dust_4096_ngp_PG10.fits with SFD_dust_4096_ngp_PG10corr.fits, and remove the 'corr' so that that whatever code you are using accesses the corrected data. While this method will work, we do not reccommend using it if you can avoid it. For one thing it is confusing -- you may not remember which version of SFD_dust_4096_ngp_PG10.fits you have. Secondly, you lose the functionality of knowing which sources have been re-corrected by the PG10 corrections. Unfortunately, this is the only way to access our corrections if you do not use IDL: we provide this method because we refuse to learn FORTRAN.

dust_getval.pro

Disclaimer

NB: While every effort has been made by authors Josh Peek and Genevieve Graves to make these data available in such a way as to mesh nicely with the existing SFD98 infrastructure, this should not be taken as an explicit or implicit endorsement of this work by David Schlegel, Douglas Finkbeiner, or Marc Davis.
If this webpage looks like it was designed in 1998, (albeit with new 2010 flair) it's because it was! Many thanks to the original web page designers:
David Schlegel, schlegel@astro.princeton.edu
Douglas Finkbeiner, dfink@astro.berkeley.edu
Adam Krigel, adamk@astro.berkeley.edu
Modified with new content by:
Josh Peek, goldston@gmail.com