WFAU Science Archives surveys.roe.ac.uk WFAU Demonstration Nick Cross, Rob Blake, Ross Collins, Mike Read, Eckhard Sutorius, Mark Holliman, Stellios Voutsinas,
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MWAWFS - RAS
WFAU Science Archivessurveys.roe.ac.uk
WFAU DemonstrationNick Cross, Rob Blake, Ross Collins, Mike Read, Eckhard Sutorius, Mark Holliman,
Stellios Voutsinas, Dave Morris
30/03/2015
Using the WFAU Archives
30/03/2015 MWAWFS - RAS
• Coverage Maps• Archive Listing• GetImage / MultiGetImage• Region• Cross ID (now includes Synoptic Source)• Freeform SQL (enhanced)• ADQL
WFAU Archives - Information• Data Overview• Schema Browser + Glossary• SQL cookbook• Monitor page• Release history• Known Issues• Publications – Hambly et al. (2008), Cross et al. (2009), Cross et al.
(2012)
30/03/2015 MWAWFS - RAS
Cross ID
30/03/2015 MWAWFS - RAS
Survey table parameters
Input file:Novae from Strobe et al. 2010
Suggested formats
Use crossID match file in queries with vvvVariability to get variability stats for VVV light-curves of 16 sources
93 Novae, find 16 good matches to vvvSource.
Freeform SQL Examples• Selecting transients • Viewing light curves• Using X-match tables• Using user generated tables– MAR enhancements
• Use COUNT_BIG(*) – necessary for tables with > 2G rows– e.g. vvvDetection, vvvTilePawprints,
vvvSourceXDetectionBestMatch– vhsDetection, gpsDetection
30/03/2015 MWAWFS - RAS
MWAWFS - RAS
Provenance and data links.• All the data is linked to its antecedants and to the curation processes • Image Provenance:
– Tile –> Stack –> Normal. – DeepTile –> DeepStack –> Stack –> Normal
• Catalogue Provenance– vvvSource –> vvvDetection –> MultiframeDetector -> Multiframe– vvvVariability –> vvvSourceXDetectionBestMatch –> vvvDetection …
• vvvDetection (tiles) -> vvvTilePawprints -> vvvDetection (pawprints)• RequiredTile –> ProgrammeFrame -> Multiframe• vvvSource -> vvvSourceXwise_allskysc -> WISE..wise_allskysc• SchemaBrowser is useful – primary and foreign key constraints.
– Papers discuss data model design, and show ERMs connecting different tables.
30/03/2015
Selecting transients
30/03/2015 MWAWFS - RAS
Use variability stats to select sources with point sources with mag>2 with >=6 epochs, 13<Ks<18 in cleaner pointings. Get mean, ampl, nEpochs, colours.
Load results into TOPCAT
(H-Ks) vs Ks for ~20000 transients
Light curves
30/03/2015 MWAWFS - RAS
Light curve params
Join tables
Variability parameter selection as temporary table
MWAWFS - RAS
X-matching
• Neighbour tables include all matches out to a joinCriterion (see RequiredNeighbours)
• Simple Options:– Nearest match only (out to a particular radius)– All matches in a radius
• SchemaBrowser lists available neighbour tables, e.g. vvvSourceXDR4gpsSource
30/03/2015
Enhanced Queries
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Use CrossID form
Output to VO table/FITS file
Load up table of matches as #userTable – used as a standard table
MWAWFS - RAS
3D Extinction Maps
30/03/2015
Function to get nearest pixelFast CROSS APPLYSOON v.fast matched table
Filter extinction coefficients
Select extinction at 8.5kpc
Select certain variables within 1<l<2.5, -0.5<b<1
30th March 2015 MW Astrophysics from WF Surveys 18
Galactic Plane and Bulge from VISTA and WFCAM
VVV + GPS mosaic ~ 1 billion starshttp://djer.roe.ac.uk/vsa/vvv/iipmooviewer-2.0-beta/lb.html
Useful for finding nebulae / clustersProduce team only ones for VMC.
Not completely automated yet.
MWAWFS - RAS
Suggestions• Understand DB design – see main papers:– Hambly et al. (2008), Cross et al. (2009, 2012)– How the data are linked (ERM diagrams).
• Use the schema browser to understand attributes, and SQL cookbook if new.
• Freeform-SQL and TOPCAT is very powerful.• Ask us at• Range of technical and scientific support.
vsa-support@roe.ac.uk
30/03/2015
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