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The NVO Data Discovery Portal Tom McGlynn NASA/GSFC

Date post:27-Mar-2015
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The NVO Data Discovery Portal Tom McGlynn NASA/GSFC Slide 2 Purpose of the Portal Get to science right away without worrying about protocols and such. Quick and convenient Integrate Web and CLI analysis Slide 3 Issues Complexity of the VO Different kinds of questions users have Our solution: Make the portal a suite of interacting services rather than a single monolithic task. Slide 4 Portal elements What kind of data is there? (registry) Poke around in a resource. (simple query) What resources are there at my positions? (inventory) Everything known about a given source (DataScope) How can I use my data in the VO ?(table converter and wizard)? How can I combine information from multiple resources? (Vim) But I dont want to have to use the web! (voclient) Slide 5 Portal home Slide 6 Portal Home (contd) http://heasarc.gsfc. nasa.gov/vo/portalhttp://heasarc.gsfc. nasa.gov/vo/portal Move to us-vo.org (or successor) later. Little bit of help documentation in the tutorial Slide 7 What kind of data is out there? Slide 8 Search Filter Page Save Sort Requery Select The active response page Slide 9 Registry Advanced Search Slide 10 Poke around. Pick searchable service and click search button. Do all sky search if appropriate, or limited positional search. Filter results Slide 11 Send results to the table viewer (SimpleQuery) Slide 12 Another active results screen Slide 13 Chromospherically Active Binaries with G stars brighter than v=8 Slide 14 Plotting Slide 15 Whats nearby? Go to inventory as result of search. Slide 16 Inventory Correlation radius New inputs Limit services to be checked Look at matches Slide 17 Inventory results Select for examination Size of catalog Number of inputs matched Slide 18 View matches Slide 19 Build up information on a list of sources: VIM Actions Current table Slide 20 Cross-correlate with USNOB Number of matches for each entry Slide 21 Compare tables Some rows match more than one input entry. Slide 22 Larger scale requests Status box Slide 23 Image gallery with VIM Slide 24 Whats known about a given source? Slide 25 Some DataScope windows Slide 26 Handling user input lists User created lists Lists downloaded from non-VO sources Slide 27 Table Wizard Slide 28 Slide 29 The table wizard creates the VOTable for you, but currently you need to manually stripe it into a file or other service to use it. Slide 30 Table converter Slide 31 Converter outputs Slide 32 Wizard versus converter Wizard is interactive lets user see how conversion is done requires data to be striped in and out. Converter uses files can send data to other services will do name resolution of target names. no interactive input, may get confused by complex files Slide 33 Off the Web: VOClient Three main tasks: VORegistry: query the registry for data resources VOData: Query the data resources VOSesame: Convert names to coordinates Can interchange lists of sources and data resources with portal Web pages. Slide 34 and it can be used from the Web too! Slide 35 VORegistry Example Slide 36 VOData example Slide 37 VOClient usage Use Web pages to see examples and try out usage. Use on the command line for repeated and operational use Long commands VOClient can create lists for use in simple query, inventory or VIM. Download your own copy from : http://iraf- nvo.noao.edu/vo-cli/downloads/index.html Slide 38 After starting in the portal TOPCAT or VOPLOT: Display and manipulate tables of results Aladin: Compare images and tables Use specialized features of discovered resources Data mining in VIM, OpenSkyQuery, WESIX or other tools Publish results Slide 39 Summary Portal is a set of services which each specialize in one area, but have a lot of overlap More than one way to do things Transition from one service to another can happen at different locations Services communicate by passing: Lists of sky positions the user is interested in Lists of data resources the user might wish to search Quick response to allow users to refine and augment queries. Slide 40 Scavenger hunt Using the portal services can you answer these: 1. Find how many image services currently provide data for the GOODS survey? 2. Find where can you get an HST 4350A image of the center of the Hubble Deep Field? [Note that the GOODS fields include HDF and Hubble Deep Field is recognized by Simbad as a valid name.] 3. Determine how many Bautz-Morgan type II Abell clusters are within 20 degrees of the south pole? 4. See how many of them are in the ROSAT FSC (within 10') 5. A burst goes off at 01 23 45, -54 32 10. Whats known about that location? 6. Learn how many chromospherically active binaries are EUV sources ? 7. See how many stars with known exoplanets have been observed by ST? [see data link on schedule for a list of exoplanets]. 8. Write a script that will show you the rough number of HST, Chandra and Spitzer observations at a given location. Slide 41 Caveats: Limited bandwidth to hotel. Some VO resources may not handle ~50 simultaneous requests

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