Web based spectrum databases and utilities László Dobos Tamás Budavári István Csabai MAGPOP...

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