J/A+A/547/A115 ASPECT - A spectra clustering tool (in der Au+, 2012)
ASPECT - A spectra clustering tool for exploration of large spectral surveys
in der Au A., Meusinger H., Schalldach P. F., Newholm M.
<Astron. Astrophys. vol, page (2012)>
=2012A&A...547A.115I 2012A&A...547A.115I
ADC_Keywords: Galaxies, spectra ; Spectroscopy ; MK spectral classification
Keywords: methods: data analysis - surveys - white dwarfs - stars: carbon -
quasars: general
Abstract:
We present the novel, semi-automated clustering tool ASPECT for
analysing voluminous archives of spectra. The heart of the program
is a neural network in form of Kohonen's self-organizing map. The
resulting map is designed as an icon map suitable for the inspection
by eye. The visual analysis is supported by the option to blend in
individual object properties such as redshift, apparent magnitude, or
signal-to-noise ratio. In addition, the package provides several tools
for the selection of special spectral types, e.g. local difference
maps which reflect the deviations of all spectra from one given
input spectrum (real or artificial). ASPECT is able to produce a
two-dimensional topological map of a huge number of spectra. The
software package enables the user to browse and navigate through a
huge data pool and helps him to gain an insight into underlying
relationships between the spectra and other physical properties and
to get the big picture of the entire data set. We demonstrate the
capability of ASPECT by clustering the entire data pool of 0.6 million
spectra from the Data Release 4 of the Sloan Digital Sky Survey
(SDSS). To illustrate the results regarding quality and completeness
we track objects from existing catalogues of quasars and carbon stars,
respectively, and connect the SDSS spectra with morphological
information from the GalaxyZoo project.
Description:
C++ source code package for the clustering tool. It can be compiled under
Windows using Visual Studio 2010 with support for 32 and 64 bit machines.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
aspect.zip . . ASPECT C++ source code package
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(End) Aick in der Au [Thueringer Landessternwarte Tautenburg] 13-Oct-2012