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AstroGrid RVO as a community center. Distant galaxy discovery problem

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Put into operation, AstroGrid RVO is considered to be one of the first steps in ... CrossMatch the results, obtained on pervious steps. Step4. ... – PowerPoint PPT presentation

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Title: AstroGrid RVO as a community center. Distant galaxy discovery problem


1
AstroGrid RVO as a community center.Distant
galaxy discovery problem
  • Alexey Vovchenko (CMC MSU)
  • RVO Workshop
  • 10.04.2006

2
AstroGrid RVO as a community center
  • AstroGrid RVO is organized as a community center
    intended for solving different astronomical
    problems over distributed repositories of
    astronomical data accumulated around the world
    (observations data, problem solution results,
    services of data and information analysis).
  • Put into operation, AstroGrid RVO is considered
    to be one of the first steps in reaching the
    objectives of Russian Virtual Observatory
    informational infrastructure (RVOII).
  • The Center has become operational at IPI RAS
    since October 2005 on the base of the AstroGrid
    system, developed at the UK and generously
    granted by the authors to be used for the RVO.

3
Basic facilitiesof the AstroGrid RVO
  • Facilities for problem solving by scientists over
    information accumulated in the VO (including
    tools for workflow management, tools for managing
    common data spaces for the group work, special
    tools for astronomical data analysis)
  • Tools for creating new services for information
    analysis
  • Facilities for setting data management systems
    and data sets supported by such systems at the
    community center
  • Tools for searching in the catalogues of the
    International Virtual Observatory based on the
    IVOA standards
  • Tools for publishing astronomical observations
    results, problem solving results, software
    services for the RVO Metadata Registries in
    compliance with the IVOA standards.

4
The first trial of the AstroGrid RVO installation
at IPI RAS
  • In August - September 2005 applying the AstroGrid
    RVO installation at IPI RAS, as the joint effort
    of the Special Astrophysical Observatory of RAS
    (SAO RAS) and IPI RAS, the information processing
    facilities have been developed and tested for
    solving the Distant galaxy discovery problem
  • The problem statement has been provided by Olga
    Zhelenkova (SAO RAS)

5
The problem overview
  • The first astronomical problem that has been
    designed by IPI RAS together with the Special
    Astrophysical Observatory of RAS (SAO RAS)
    applying AstroGrid and Aladin is a distant
    galaxy discovery in the sky strip investigated in
    the Cold deep survey with the RATAN-600 (large
    Russian radio telescope).
  • For the beginning we used RCcatalogue as a list
    of radio sources.
  • The approach applied looks fairly simple.
  • We need to select optical sources with certain
    properties taken from DR 3 SDSS and crosssmatch
    them with the RCcatalogue.
  • The result of the crossmatch may contain
    candidates for distant galaxies that should be
    analyzed further applying their images and Aladin
    capabilities.

6
Information processing steps at distant galaxy
search
  • Radio sources search in RCcatalogue in the given
    sky area
  • Optical sources search in SDSS DR3 catalogue in
    the given sky area
  • Optical sources selection on the base of
    predicates taking into account color values of
    sources
  • CrossMatch of the radio and optical sources,
    obtained at the previous steps
  • Download the respective images from FIRST and
    SDSS images archives, and provide their
    superposition. Analyze the result

7
CEA-application, MySpace and DSA
  • CEA-interface provides access from the AstroGrid
    system to the external applications
  • Application, accessed from the AstroGrid system
    by the CEA-interface, is known as CEA-Application
  • MySpace is a storage file system for a user data
    queries, workflows, intermadiate results and
    final results
  • DSA provides access from the AstroGrid system to
    local data bases (PostgreSQL and MySQL)

8
Information processing steps in AstroGrid system
and Aladin
  • AstroGrid Workflow
  • Step1. RCcatalogue Query
  • Step2. SDSS Query
  • Step3. CrossMatch the results, obtained on
    pervious steps
  • Step4. Download images and provide superposition
    of them
  • Aladin
  • Step5. Image analysis by a specialist

9
Step1. RCcatalogue Query
  • CEA-Application is launched which execute the
    ADQL query to the data base, containing the
    RCcatalogue
  • The local copy of RCcatalogue has been created at
    PostgreSQL, and formed as an AstroGrid DSA
    component
  • Result obtained in the VOTable format has been
    automatically placed into the MySpace

10
Step1. RCcatalogue Query
11
Step1 Example of the ADQL query
  • SELECT crd.ra, crd.de, cat.name
  • FROM RCCatalog as cat, CoordEQJ as crd
  • WHERE cat.coord_id crd.coord_id

12
Step1 Example of a result
13
Step2. SDSS Query
  • CEA-Application is launched, which, applying the
    web-service provided by SDSS (CasService
    http//voservices.net/CasService/ws_v1_0/CasServic
    e.asmx ), executes the query
  • Result obtained in the VOTable format has been
    automatically placed into the MySpace

14
Step2 Example of a query
  • SELECT
  • racast(ra as real), deccast(dec as real),
    objid, u, g, i, r, z, colorIndexURG(ur)/
    2.0-g
  • FROM PhotoPrimary
  • WHERE ra BETWEEN 225.0 AND 225.5
  • AND dec BETWEEN 4.0 AND 5.61
  • AND r BETWEEN 15.0 AND 23.0

15
Step2. SDSS Query
16
Step3. CrossMatch the results
  • CrossMatch the result of two previous steps using
    CrossMatcher provided by AstroGrid
    (ivo//org.astrogrid/CrossMatcher).
  • Result obtained in VOTable format has been
    automatically placed into the MySpace
  • The result of the CrossMatch may contain
    candidates for distant galaxies

17
Step3. CrossMatch the results
18
Step4. Downloading images and providing
superposition of them
Script (ra,dec)
Aladin stack
19
Aladin Script
  • reset grid
  • get DSS.ESO(DSS1,14.1,14.1) adress 5' sync
  • get NVSS(0.2,15.0,Stokes I,Sine) adress 5'
  • sync contour 4
  • get FIRST(10) adress 5'
  • sync contour 4
  • get SDSSDR3cat adress 1'
  • sync
  • get VizieR(2mass) adress 1'
  • sync
  • show 1 hide NVSS FIRST
  • backup st.aj

20
Step4. Downloading images and providing
superposition of them
21
Step5. Image analysis by a specialist
  • Launching Aladin (version 3.030_votech)
  • Launching Workbench
  • Opening Aladin stack, saved in MySpace on a
    previous step
  • Viewing, analyzing, probably editing obtained
    images using Aladin tools

22
Step5 An example of MySpace access from Aladin
23
Step5 An example of images obtained by Aladin
24
Step5 An example of images obtained by Aladin
25
  • Distant galaxy discovery tools (reported in the
    talk) applying the AstroGrid RVO and Aladin will
    be demonstrated tomorrow at the demo session
    (starts at 1150)

26
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27
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