Commit 4a9e9231 authored by Leo Pound Singer's avatar Leo Pound Singer

Add references to the HEALPix paper

Addresses #145.
parent 6ca899d4
......@@ -141,8 +141,8 @@ The sky localization consists of the posterior probability distribution of the
source's sky position and (for :term:`CBC` events only) luminosity distance.
The GCN Notice and Circular will provide a URL for the sky localization file
stored in GraceDB. The sky localization is saved in a :term:`FITS` file as a
:term:`HEALPix` all-sky image. See our :doc:`sample code </tutorial/skymaps>`
for instructions on working with sky localization files.
:term:`HEALPix` [#HEALPixFramework]_ all-sky image. See our :doc:`sample code
</tutorial/skymaps>` for instructions on working with sky localization files.
.. important::
We generally provide localizations in two HEALPix formats, distinguished by
......@@ -407,3 +407,9 @@ Below are some sample VOEvents to illustrate the formatting of the GCN Notices.
.. _`Aladin`: https://aladin.u-strasbg.fr/
.. _`astropy-regions`: https://astropy-regions.readthedocs.io/
.. _`pyregion`: https://pyregion.readthedocs.io/
.. |apj| replace:: *Astrophys. J.*
.. [#HEALPixFramework]
Górski, K.M., Hivon, E., Banday, A.J., et al. 2005, |apj|, 622, 759.
:doi:`https://doi.org/10.1086/427976`
......@@ -5,10 +5,10 @@ Let's take a look at what is inside one of the LIGO/Virgo probability sky maps.
They are FITS image files and can be manipulated and viewed with many
commonplace FITS tools. However, they are a little unusual in two regards.
First, since they are all-sky images, they are stored in the :term:`HEALPix`
projection, a format that is used for Planck_ all-sky CMB maps and by Aladin
for hierarchical, progressively refined, all-sky survey images (HiPS_). Second,
the value stored at each pixel is the probability that the gravitational-wave
source is within that pixel.
[#HEALPixFramework]_ projection, a format that is used for Planck_ all-sky CMB
maps and by Aladin for hierarchical, progressively refined, all-sky survey
images (HiPS_). Second, the value stored at each pixel is the probability that
the gravitational-wave source is within that pixel.
.. figure:: https://healpix.jpl.nasa.gov/images/healpixGridRefinement.jpg
:alt: HEALPix projection
......@@ -409,8 +409,13 @@ bilinear interpolation between pixels. See the :doc:`Healpy tutorial
.. _Planck: https://www.esa.int/Our_Activities/Space_Science/Planck
.. _WCSTools: http://tdc-www.harvard.edu/wcstools/
.. |apj| replace:: *Astrophys. J.*
.. |mnras| replace:: *Mon. Notices Royal Astron. Soc.*
.. [#HEALPixFramework]
Górski, K.M., Hivon, E., Banday, A.J., et al. 2005, |apj|, 622, 759.
:doi:`https://doi.org/10.1086/427976`
.. [#MappingOnHEALPix]
Calabretta, M. R., & Roukema, B. F. 2007, |mnras|, 381, 865.
:doi:`10.1111/j.1365-2966.2007.12297.x`
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