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How to use the GALEX SkyNode *

Explore how to efficiently utilize the GALEX SkyNode with SkyQuery for spatial matching in astronomical archives. Learn to build and run queries to extract relevant data from various surveys with easy steps and customization options. Discover the power of federated databases in revolutionizing astronomical data analysis.

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How to use the GALEX SkyNode *

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  1. How to use the GALEX SkyNode* A quick tutorial by the MAST/GALEX Team at STScI *SkyNode was developed and is maintained by JHU staff 1.1

  2. What is SkyNode? • SkyNode is the interface to a prototype of a “federated” database application called SkyQuery. • At the heart of SkyQuery is spatial matching, which means we want to find the same objects listed in different catalogs. • Astronomical archives double every year. Increasingly, data are stored in on-line archives. Instrumental surveys covering a large fraction of the sky are a major part of this revolution. SkyQuery relies on surveys stored at different geographic locations.

  3. SkyQuery: Interface • The SkyQuery interface window is divided in 2 parts: • The list of SkyNodes can be queried by marking checkboxes • A SQL-like text box is used to submit queries

  4. SkyQuery: consult a SkyNode’sparameters. Step 1 The contents of each SkyNode can be browsed. • Select a survey and its list of tables or functions. Click Search. • From the entries returned, enter any column/function of interest in Argument. Click Search.

  5. SkyQuery: consult a SkyNode’sparameters. Step 2 • To build a query, we need to know what keywords to use in table e.g. PhotoPrimary, so select Columns(TableName). • Now run Steps 1 and 2 for another SkyNode(s). Columns from PhotoPrimary Now we are ready to run the query…

  6. Run an ADQL (SQL-like) query • Running a query is simple. Write it in the SQL-like query box or … • Click and customize any of 4 sample queries, #1, #2 … • See also “tutorial” http://www.skyquery.net/ tutorial.html • To submit query, click Submit. Cross correlation results appear! (ra,dec,radius)

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