GAVO after one year H M Adorf the

GAVO – after one year H. -M. Adorf & the GAVO team

GAVO’s Pillars Publication and federation of datasets n including theoretical ones Spatial matching & classification & visualization (NGSE) Grid computing ADA III - 29 -04 -2004

The GAVO Team PI: Wolfgang Voges, MPE, Garching Co. I: Matthias Steinmetz, AIP, Potsdam Hans-Martin Adorf, MPE Harry Enke, AIP Gerard Lemson, MPE ADA III - 29 -04 -2004

Collaborations MPE, Garching (Peter Schuecker) AIP Potsdam Canadian Virtual Obs. (CVO), Victoria Universitaetssternw. Muenchen (USM) MPA, Garching (Planck, …) ADA III - 29 -04 -2004

GAVO Work Areas Publication of ROSAT datasets n n REST-based SCS service (HTTP GET in; XML, CSV, HTML out) SOAP-based SCS service MCMCS Download Manager Fuzzy spatial matcher Grid-based detection of galaxy clusters ROSAT matcher/classifier service ADA III - 29 -04 -2004

ROSAT All-Sky Survey (RASS) BSC, FSC & Photons VO-compatibility: n n Input: Simple cone search Output: VOTable, … New features n n n Exposure times Galactic & Cartesian coordinates Healpix indices ADA III - 29 -04 -2004

SCS ADA III - 29 -04 -2004

Result ADA III - 29 -04 -2004

VOTable ADA III - 29 -04 -2004

MCMCS Download Manager Tool … n … accesses registry at JHU User … n n … selects up to 70 distributed catalogues … specifies one or more sky-locations Tool … n n … queries remote catalogues … retrieves datasets (VOTables) for further processing ADA III - 29 -04 -2004

MCMCS Download Manager ADA III - 29 -04 -2004

MCMCS Download Manager ADA III - 29 -04 -2004

Workflow ADA III - 29 -04 -2004

Fuzzy spatial matcher Essential for data mining Prototype features w Performs “fuzzy” match between pairs of source lists from different catalogues w Computes probability of real match based on astrometric uncertainties Moving matcher into production use w Currently exported to Canadian Virtual Observatory w Feeding matches to Class. X classifier Long-term goal: assemble an SED ADA III - 29 -04 -2004

Fuzzy spatial matcher (ctd) ADA III - 29 -04 -2004

Grid computing What is Grid-computing? n n Globus Toolkit, SGE, EJBs Web. Services Detection of galaxy clusters n using RASS photons, SDSS RASS source classification n using RASS B/FSC, SUMSS, NVSS, USNO ADA III - 29 -04 -2004

Workflow ADA III - 29 -04 -2004

Galaxy-cluster detection Search for galaxy clusters in heterogeneous databases n n RASS photons SDSS Software n n n FORTRAN 90 code (data analysis) Perl scripts (data/grid management) Globus Toolkit ADA III - 29 -04 -2004

Galaxy-cluster detection Components n Setup script w Sets up the directory structure w Distributes the software across the grid n Execution script w Triggers the parallel execution on the compute nodes n Data collection script w Retrieves the results from the compute nodes ADA III - 29 -04 -2004

GAVO Mini-GRID ADA III - 29 -04 -2004

Status Perl scripts Upgrading the RASS Photon DB Soon integrate the SDSS mirror copy ADA III - 29 -04 -2004

RASS-source classifier Class. X: international collaboration w T. A. Mc. Glynn, A. A. Suchkov, E. L. Winter, R. J. Hanisch, R. L. White, F. Ochsenbein, S. Derriere, W. Voges, M. F. Corcoran Requires data from several sky-surveys w w X-ray: ROSAT BSC+FSC Optical: USNO, (SDSS) Infrared: (2 MASS) Radio: FIRST, NVSS, SUMSS Distributed multi-wavelength VO-application ADA III - 29 -04 -2004

Data Flow ADA III - 29 -04 -2004

Pose. Query ADA III - 29 -04 -2004

Display. Query. Result ADA III - 29 -04 -2004

Display. Match. Result ADA III - 29 -04 -2004

The matching problem ADA III - 29 -04 -2004

Display. XMatch. Result ADA III - 29 -04 -2004

Display. Class. XResult ADA III - 29 -04 -2004

RASS-source classifier State & session management n n Using Java Servlet session mechanism Internal abstract state machine Strong points n n n End-to-end VO-application Works with lists of objects / sky-coordinates Accesses several distributed databases Uses deterministic matcher (at Vizier and SDSS) Uses probabilistic matcher (at GAVO) Uses data analysis service (at NASA) ADA III - 29 -04 -2004

RASS-source classifier Future work n Use IVOA-standards or protocols w VOTable w WSDL, SOAP-based Web Services w Add graphics n n Multi-threaded Modularize, generalize and make S/W configurable ADA III - 29 -04 -2004

RASS-source classifier Open questions n n n Is an HTML form-based GUI sufficiently powerful to control a complex grid application? What are the user expectations wrt the workflow? Is there a standard workflow that one could use / agree upon? ADA III - 29 -04 -2004

Conclusion GAVO is a small, but ambitious project Two Grid applications n Detection of galaxy clusters w Globus Toolkit n Classification of ROSAT sources w Based on Web. Services ADA III - 29 -04 -2004

References n n n GAVO Mid-Term Report, 90 pages, http: //www. g-vo. org (soon) Detection of X-ray Clusters of Galaxies by Matching RASS Photons and SDSS Galaxies within GAVO, P. Schuecker, H. Boehringer, W. Voges, A&A (submitted) Automated classification of ROSAT sources using heterogeneous multiwavelength catalogs, T. A. Mc. Glynn et al. , Ap. J (submitted) ADA III - 29 -04 -2004