Virtual Observatory publication of interferometry simulations

Transcription

1 Virtual Observatory publication of interferometry simulations Anita Richards, Paul Harrison JBCA, University of Manchester Francois Levrier LRA, ENS Paris Nicholas Walton, Eduardo Gonzalez-Solarez IoA, Cambridge p1

2 VO usage and brief explanation VO access to simulated data e.g. SKADS Simulated Skies (S3) How the VO query works (UK AstroGrid interface) Manipulate results in TopCat Compare with observed Deep Field On-the-fly interferometry image extraction Exchange data between analysis tools Publishing data to VOs: Metadata, Registry Data publishing tools from AstroGrid User scripting IVOA: Interoperability standards Useful links ALMA applications p2

3 3 SKADS Simulated Skies (S ) (thanks to Levrier; see Heywood talk) Semi-Analytic extragalactic Obreschkow et al. Semi-Empirical extragalactic Wilman et al. MN 2008 Radio-quiet AGN, FRI, FR2, SFG, SB 150, 610, 1400, 4860, MHz continuum HI cubes, clusters, halos... Continuum sensitivity 10 njy, z 20 ~300 million sources in 400 square degrees Web access to catalogues, images, cubes ox.ac.uk Tabular data published to VO More services, PULsar simulation under dev. p3

4 Central square degree of S-cubed SEX Radio-quiet AGN Normal galaxies FR I FR II Starburst p4 Courtesy of F. Levrier s-cubed.physics. ox.ac.uk

5 How the VO query works VO harvests data providers' standard descriptions Publishing registries at Cambs, CDS, HEASARC etc. VOExplorer searches Registry of resources Chose SKADS Simulated Sky Catalogues stored in database in Cambridge Content description contains 'SKA' and 'simulated' Browse/sort details of columns etc. User types query in SQL-like ADQL or uses tree GUI Query sent to database Results returned as standard xml-like VOTable Examine, process, convert to ascii e.g. in TopCat p5

6 AstroGrid 'desktop' access to S 3 VOExplorer Task Runner Search for 'SKA' - 53 data sets Refine: Content includes 'simulated' Select ADQL interface p6

7 AstroGrid 'desktop' access to S 3 VOExplorer Task Runner Execute Search for 'SKA' - 53 data sets query Refine: Content includes 'simulated' Find sub-mjy galaxies within 0.25 deg box Select ADQL interface Select * From sources as a where a.right_ascension> and a.i_151 < -3 p7 Validation/diagnostics

8 Manipulate results in TopCat Astronomical spreadsheet Co-ord/format conversions, maths, publishable plots... Scripting/library STILTS p8

9 Manipulate results in TopCat Astronomical spreadsheet Add ( , ) to RA, Co-ord/format conversions, maths, publishable plots... Dec to allow overlay on HDF(N) Scripting/library STILTS p9

10 Compare with observed Deep Field MERLIN+VLA HDF (GOODS North) on-line at JBCA (8.5 x 8.5) arcmin ~ 67 million pixels AstroGrid service extracts cut-outs at 0."2-2" resolution Similar to MERLINImager access to MERLIN Archive Calibrated visibility data imaged on demand Position Image size Resolution p10

11 MERLINImager User IVOA Registry No radio jargon nor domainspecific software Managed via AstroGrid Universal Worker Service Python wrapper to AIPS Download VOExplorer Task Launcher MERLINImager Position, size,, resoln, date AstroGrid UWS MERLIN archive RadioNet Parseltongue p11 Aladin, GAIA VOSpace FITS images VOTable description

12 Exchange data between analysis tools Send edited table (90 k sources) to Aladin from TopCat IVOA SAMP protocol lets applications communicate Use Aladin filter to plot simulated source sizes Load table of 92 publishedp12sources >40 Jy from Vizier Overlay on cut-out radio image

13 Aladin and TopCat Select point in Aladin Same point Simulations with ALMA Sep 2008 AMS Richards highlighted in TopCat Make new column on the fly Spectral index = (i_151 - i_18000)/log(18000/151) p13

14 Aladin and TopCat Select point in Aladin Same point Simulations with ALMA Sep 2008 AMS Richards highlighted in TopCat Make new column on the fly Spectral index = (i_151 - i_18000)/log(18000/151) p14

15 Publishing data to VOs: Descriptions VOTable METADATA Uniform Content Descriptors Data Models 'Simple' Image etc. Access Protocols S*AP: also *=Spectral Table Line... DATA Astronomical or description, URL for images etc. Ensure consistent queries and results p15

16 Publishing to VOs: Registry Publish standard description to Registry Service type, capabilities, content, waveband etc. Find data and services anywhere Database queries written in ADQL Translate at DB into local SQL dialect Or simple cone seach p16

17 Publishing to VOs: Registry Publish standard description to Registry Service type, capabilities, content, waveband etc. Find data and services anywhere Database queries written in ADQL Translate at DB into local SQL dialect Or simple cone seach p17

18 Publishing to VOs cont. courtesy Nic Walton p18

19 Data publishing tools from AstroGrid Data Set Access (DSA) Translates between VO protocols and common DBs Universal Worker Service (ex-cea) Manages web services (Tomcat) Wrap any command-line script Pass parameters from GUI or other UI Returns results as appropriate Directly to user's cache Via VOTable description + URLs for bulky data User side Astro Runtime API for Desktop & scripting Enables SAMP (Plastic) message passing p19

20 User-scripted workflows Astro Runtime provides environment Easiest/commonest for Python Download AstroGrid module Full documentation and examples Search Registry for data or tools Send queries Manipulate results Use Stilts library to work on VOTables Use your own local programs Launch PLASTICised display packages Also available for java, IDL etc. (in progress) p20

21 User-scripted workflows Astro Runtime provides environment Easiest/commonest for Python Download AstroGrid module Full documentation and examples Search Registry for data or tools Send queries Manipulate results Use Stilts library to work on VOTables Use your own local programs Launch PLASTICised display packages Also available for java, IDL etc. (in progress) p21

22 IVOA: Interoperability Standards The International Virtual Observatory Alliance Forum for national/continental VOs Projects represent astronomy data & service providers Forum for interoperability standards VO projects build on these standards Bi-annual meetings Mailing lists p22

23 VO links AstroGrid On-line help, downloads AstroGrid services to enable VO data publishing EuroVO, AIDA Tools to organise metadata, construct registry entries Workshops, possible local support International Virtual Observatory Alliance Documents, xml schemata, discussion/development WGs incl. Data Access, Applications, Theory... p23

24 ALMA applications ALMA data 'VO compatible' ALMA SDM v. VO data models? Start with simplest end-products 'Josie astronomer' use cases Remote user-steered pipelines? VO spectral line standards under development Simulations of general interest Planning observations Analysing data Ideas from this workshop: TopCat convert tables to CC? SAMP for ALMASimmos ObsPrep? Extract/refine FITS metadata > DB p24 Peretto et al 2007 Star formation with varying turbulence