The goal of <img src="logo_type.png" alt="ANCHORS" align=center> is to provide a uniform (not necessarily optimal)
database for the comparison of data from different clusters.
<br><br>

The following tools are used directly or indirectly in the creation
or presentation of the catalog:<br>
<br>
CHaSeR <a href="http://cda.harvard.edu/chaser/mainEntry.do" target="new">
http://cda.harvard.edu/chaser/mainEntry.do</a><br>
Chandra Search and Retrieve is used to find available archival
data.  There is also a java-based version included in CIAO
distributions which can return an ASCII list of observations
satisfying search parameters.<br><br>

CIAO <a href="http://cxc.harvard.edu/ciao/" target="new">
http://cxc.harvard.edu/ciao/</a><br>
CIAO is used by the standard Chandra data processing pipeline.
It is used directly by the catalog prep pipeline to copy and
filter event files and to make exposure maps and aspect histograms.<br><br>

PWdetect <a href="http://www.astropa.unipa.it/progetti_ricerca/PWDetect/" target="new">
http://www.astropa.unipa.it/progetti_ricerca/PWDetect/</a><br>
PWdetect is used for source detection in place of celldetect.  Produces 
list of source positions, count rates, significance.<br><br>

Acis_extract <a href="http://www.astro.psu.edu/xray/docs/TARA/ae_users_guide.html" target="new">
http://www.astro.psu.edu/xray/docs/TARA/ae_users_guide.html</a><br>
Acis_extract is the main analysis engine for the catalog, 
from Patrick Broos et.al. at Penn State University.<br><br>

XSPEC <a href="http://heasarc.gsfc.nasa.gov/docs/xanadu/xspec/" target="new">
http://heasarc.gsfc.nasa.gov/docs/xanadu/xspec/</a><br>
XSPEC is the spectral fitting tool called by acis_extract.<br><br>

Sherpa <a href="http://cxc.harvard.edu/sherpa/index.html" target="new">
http://cxc.harvard.edu/sherpa/index.html</a><br>
Sherpa is the CXC-based spectral fitting tool.  We will
use this tool in place of XSPEC to run APEC (<a href="http://cxc.harvard.edu/atomdb/sources_apec.html" target="new">
http://cxc.harvard.edu/atomdb/sources_apec.html</a>) modelling.<br><br>

Yaxx<br>
Yaxx is a Perl package by Tom Aldcroft to automate Sherpa fitting.<br><br>

Bayesian Blocks <a href="http://space.mit.edu/CXC/analysis/SITAR/" target="new">
http://space.mit.edu/CXC/analysis/SITAR/</a><br>
We run a suite of S-Lang (<a href="http://www.s-lang.org/" target="new">
http://www.s-lang.org/</a>) scripts
to create Bayesian block light curve analysis.<br><br>

Spectral Quantiles <a href="http://hea-www.harvard.edu/ChaMPlane/quantile/" target="new">
http://hea-www.harvard.edu/ChaMPlane/quantile/</a><br>
Quantiles are indicated as another spectral metric, especially
in low-count sources.  Created with IDL and Perl code by Jaesub Hong.<br><br>

SkyView <a href="http://skyview.gsfc.nasa.gov/" target="new">
http://skyview.gsfc.nasa.gov/</a><br>
SkyView provides images from many telescopes across all wavelengths.
Batch execution is available for use in scripts.<br><br>

ADS <a href="http://adswww.harvard.edu/" target="new">
http://adswww.harvard.edu/</a><br>
NASA's Astronomical Data System is THE bibliography of published 
Astronomy and Astrophysics, Instrumentation, Physics and Geophysics.<br><br>

SIMBAD <a href="http://simbad.u-strasbg.fr/Simbad" target="new">
http://simbad.u-strasbg.fr/Simbad</a><br>
SIMBAD provides basic data, cross-identifications and bibliography 
for astronomical objects outside the solar system.<br><br>

<br>
<a href="about.html">Science background</a>&#160 &#160
<a href="about_notes.html">Processing info</a>&#160 &#160
<a href="versions.html">Versioning scheme</a>
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