The SKADS sky and databases

F. Levrier, R. Wilman, D. Obreschkow, H.-R. Klöckner, S. Rawlings(Oxford Astrophysics)

D. Olteanu, S. Young(Oxford e-Research Center)

DS2-T1 MEETINGLISBON

JANUARY 7, 2008

• ASCII files

• large quantities of data (~45 Gb)

Output from continuum and line simulations

Source type Sources ComponentsRadio-quiet

AGN36,132,566 1

FRI 23,853,134 3FRII 2,354 5

“Normal” galaxies

168,046,330 1

Starburst galaxies

7,267,382 1

Example: continuum simulations - 235,301,766 sources

Data distribution and map making• Query data based on position, source type, flux limit...

• Requires database structure (MySQL / PostgreSQL)

• Continuum simulations database + HI line simulations database

• For each database : source tables + cluster table

Example: continuum simulations databaseSource table Cluster table

• Unique source index per substructure

• NULL values for Q,U,V fluxes

• Max. number of entries per table: 1,000,000

Making the SKADS continuum sky

Read structure Read structure informationinformation

position - size - orientation - reference fluxes

Input map parametersInput map parametersregion - source types - resolution - frequency -

flux limit

Query databasesQuery databases

Build template imageBuild template image Compute fluxCompute flux

Scale template imageScale template image

Paste into full mapPaste into full map

Making the SKADS HI line sky (I)First approach @ low resolution :

synthetic spectra

HI flux

Synthetic double-peaked shape

• Galaxy models made of “clouds”

• Placed according to density profile

• Orbiting according to velocity curve

• 5 galaxy types (spirals and irregulars)

• 46 inclination values (0-90 degrees)

• 5 asymptotic velocities

Making the SKADS HI line sky (II)Second approach @ high resolution : template cubes from

R. Boomsma

S0-Sab

scale / rotate / paste

QuickTime™ and aAnimation decompressor

are needed to see this picture.

Map Maker

• Standalone application in Python / IDL

• SQL/Python interface

• FITS output

Central square degree of the continuum simulations

Radio-quiet AGN FR I FR II

“Normal” galaxies Starburst

Where we stand, where we’re going

• Database implementation

• IDL to python conversion of Map Maker

• Release of central square degree data in the test phase (~100 Mb) http://webmail.jb.man.ac.uk/skadswiki/ContsimVersion4

• Testing of simulation output (T. Mauch, F. Abdalla, T. Kitching)

• Hosting of the database server by OeRC

• Implementation of web interface for database and imaging queries

• Release of Map Maker

• Release of the full simulations

• Interface with a MeqTrees sky model

MeqTrees interfaces with AIPS++ Measurement Sets, but it doesn’t build them from scratch

Local MS generator: python interface to a glish script from T. Willis

Can use existing configurations or generate random ones

Measurement Set Generator