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Web basedspectrum databasesand utilities
László DobosTamás BudaváriIstván Csabai
MAGPOP kick-off meeting, January 2005. Cassis
Main goal
Develop easy-to-use software for further scientific application (photo-z)
Uniformed web interface Web Services Virtual Observatory compliant
Advantages of web based tools
Databases are 100s of Gbytes Database and tools are on the same high
performance server Only results pushed through the network No local installation No local storage required No high network traffic
Tasks to do
Convert legacy datasets into hierarchical databases
Create wrappers for existing software tools to provide web service interface
Create easy-to-use web sites to test tools and access all documentation you need
Write web service client programs in minutes to access data and use the tools
Spectrum Database
Developed at JHU for the SDSS spectra More than 1,000,000 spectra, 150Gb SDSS, 2dF
Users can upload their own spectra and store in the database
Spectrum search
Cone search by celestial coordinates Advanced search:
Object classRedshiftWavelength coverageEtc.
SQL search for complex queries
Search results
Plot them on a graph Perform on-the-fly operations:
Put into restframe Normalize flux Generate composite spectra
Save them to ‘my spectra’ Download them in several formats
ASCII, XML, VOTable
‘My spectra’
Password protected part of the database You can save results of computations here Run queries on them, such on the large
database Publish them to other users
Filter profile service
Central repository of optical filter profile curves Advanced search possibilities Users can upload their own filter profiles
Can be user with the spectrum database to calculate synthetic magnitudes (still in development)
Bruzual & Charlot Models
Wrapper interface for the Fortran program Provides similar web interface as the
Spectrum Service Run modelling with few mouse clicks
Not all program features are available via the interface
BC Modelling Results
Display the result on a graph Download in several formats
XMLVOTable
Upload to a remote database,to ‘my spectra’
Color-space visualization tool
Plot 2D and 3D histograms of the distribution of galaxies in the color space
Plot the color-index curve of spectra by redshift
Still in development
Web addresses
Spectrum service:http://voservices.net/spectrum
Filter profile service:http://voservices.net/filter
Bruzual-Charlot Galaxev 2003http://redshift.elte.hu/bc03ws