VOSA. A VO Spectral Energy Distribution Analyzer. Carlos Rodrigo Blanco 1,2 Amelia Bayo Arán 3 Enrique Solano 1,2 David Barrado y Navascués 1
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1 VOSA A VO Spectral Energy Distribution Analyzer Carlos Rodrigo Blanco 1,2 Amelia Bayo Arán 3 Enrique Solano 1,2 David Barrado y Navascués 1 1 CAB,INTA-CSIC 2 Spanish Virtual Observatory 3 European Southern Observatory IVOA interoperability meeting Napoli, May 16-20, 2011
2 Introduction VOSA (VO Sed Analyzer) a web tool: designed to automatically determine physical parameters from comparison of observed photometry with collections of theoretical models. for several objects at the same time. ( 1000 objects) Much easier using VO tools.
3 A science case: Collinder 69 The case of the young cluster Collinder 69 (Bayo et al, 2008 A&A 429,277B) IRAC photometry for 167 candidate members of C69. VO archival data research (multi-wavelength range). Four different collections of theoretical models (with TSAP and S3). Determination of the best physical parameters for the objects and the association (T eff, gravity, mass and age)
4 Workflow Build object SEDs. Object properties: name resolution, distance, extinction. User photometry tables + VO catalogs. Analyze object SEDs. Fit observed data with theoretical spectra models from the VO and estimate physical parameters for the objects. (Chi-square test + Bayes analysis) Generate a Hertzsprung-Russel diagram using the estimated parameters, obtaining isochrones and evolutionary tracks from the VO (only stars). Save results as VOTable, ASCII, png, eps...
5 Workflow Build object SEDs. Object properties: name resolution, distance, extinction. User photometry tables + VO catalogs. Analyze object SEDs. Fit observed data with theoretical spectra models from the VO and estimate physical parameters for the objects. (Chi-square test + Bayes analysis) Generate a Hertzsprung-Russel diagram using the estimated parameters, obtaining isochrones and evolutionary tracks from the VO (only stars). Save results as VOTable, ASCII, png, eps... C. Rodrigo Blanco VOSA
6 Two different workflows
7 Improving VOSA We often receive suggestions and/or requests to improve the tool in different aspects from several sources Euro-VO Science Advisory Commitee. VO schools feedback. VOSA users. Scientific projects with special needs.
8 Object properties The user can specify, in the input file, some important object properties:
9 New: object properties More and better information about object properties: More flexibility with object names. Names with spaces, like the one for the variable star R Aql, can be used now just as R Aql. Object distance from VO catalogues. Object extinction properties (R v, E(B-V),A v ) from VO catalogues. (SAC, VO schools, users)
10 Object properties: Distance The object distance is important to calculate bolometric luminosities in the model fit. build the HR diagram to infer masses and ages.
11 Object properties: Extinction Having the right value for the extinction is very important because it changes the SED, specially for hot objects.
12 Object properties: Extinction
13 New: More catalogues with VO photometry More catalogues with VO photometry. (It s not just querying the catalogues. We need the filters, zero points, the synthetic photometry for all the theoretical models and a careful correspondence with the catalogue data) AKARI FIS/IRC GLIMPSE IRAS MSX 20 catalogues. Request by Euro-VO SAC to extend queries to IR photometric catalogues
14 New: More collections of theoretical spectra More collections of theoretical spectra. Hot stars: TLUSTY OSTAR2002+BSTAR2006 Grid Husfeld et al non-lte models for Helium-rich stars. (scientific projects)
15 New: Model fit Model fit Better plots. Option to include the theoretical spectra together with the photometry in the fit plots. Bayes analysis of parameter space. A different approach to estimate the best values for the physical parameters, assigning probabilities to the different possible values. (Users + Scientific projects)
16 Chi-square fitting (galaxies)
17 Bayes analysis (galaxies)
18 Bayes analysis (galaxies)
19 VOSA in action VOSA has been important for some scientific projects. At least 2 papers in Presented and used in SVO and Euro-VO schools. 4 schools in
20 VOSA in action VOSA has been important for some scientific projects. At least 2 papers in Presented and used in SVO and Euro-VO schools. 4 schools in
21 VOSA in action VOSA has been important for some scientific projects. At least 2 papers in Presented and used in SVO and Euro-VO schools. 4 schools in
22 VOSA in action VOSA has been important for some scientific projects. At least 2 papers in Presented and used in SVO and Euro-VO schools. 4 schools in
23 VOSA in action VOSA has been important for some scientific projects. At least 2 papers in Presented and used in SVO and Euro-VO schools. 4 schools in
24 Work in progress Adding new functionalities when needed for scientific projects. More filters. Other theoretical models. k-correction: taking into account the effect of red-shift in the photometry (galaxies). Global search of object properties (extinction, distance, redshift) in VO catalogues. VO photometry: search by quality flag....
25 THANK YOU!
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