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Welcome to our web site dedicated to spectrum related VO services developed at the
Johns Hopkins University . On these pages you will
find tools and tutorials on how to access more than 1,000,000 spectra
from the Sloan Digital Sky Survey (SDSS DR6).
The services are open
to everyone to publish their own spectra in the same framework. Reading the tutorials
on XML Web Services, you can learn how to integrate the spectrum and passband
database with your programs with few lines of code.
Version 3.1 only contains SDSS DR6 spectra, but we are
working on upgrading older datasets:
The spectrum catalog has a growing selection of spectra data from several surveys.
It currently contains the complete SDSS DR1, DR2, DR3, 2dFGRS spectrum catalog.
The collection is expandable: you can add your own spectra using the web site or
the web services.
The search tools include simple ones e.g. select a redshift range as well as more
advanced ones, where the selection of spectra may be refined. Keeping with the VO
standard ConeSearch, one can also select objects in a given virtual pointing allowing
to find objects by their RA, Dec coordinates.
This website is intended to provide an easy to use interface to access the catalogs.
All the basic tasks can be done on the forms. The site provides several visualisation
and computational tools, for example building a composite spectrum from the results
of a selection, which may be downloaded as well in several standard formats such
as plain ascii, XML and VOTable.
Every tool published on these pages may be also accessed programmatically via XML
Web Services. We recommend you try the VO way and test drive our webservices and
take advantage of them to automate (for example) the upload of large amount of filter
profiles and spectra. Read the tutorial here to get started. For more details visit
The website is 770 pixels wide. To print on a Letter or A/4 size sheet, you should
set the printing margins on both sides to 0.4 inch or 1 cm in Internet Explorer
You can query the database and use webservices without being a registered
user. If you want to post your own filter profiles or spectra to the database,
please use the register link on the top of the page to get your username,
password and WebServiceId (required for using the webservices via SOAP).
Please reference the following paper if you're doing science using Spectrum Services:
Dobos, L., Budavári, T., Csabai, I., & Szalay, A.S. 2004, "Spectrum and Bandpass
Services for the Virtual Observatory", Astronomical Data Analysis Software and Systems
(ADASS) XIII, 314, 185
This work was partly supported by:
OTKA-T047244, MSRC-2005-038 and MRTN-CT-2004-503929