The SKADS sky and databases F. Levrier, R. Wilman, D. Obreschkow, H.-R. Klöckner, S. Rawlings...
-
Upload
louisa-hood -
Category
Documents
-
view
235 -
download
0
Transcript of The SKADS sky and databases F. Levrier, R. Wilman, D. Obreschkow, H.-R. Klöckner, S. Rawlings...
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.
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