Download PPT

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 MEETING
LISBON
JANUARY 7, 2008
Output from continuum and line simulations
•
•
ASCII files
large quantities of data (~45 Gb)
Example: continuum simulations - 235,301,766 sources
Source type
Sources
Components
Radio-quiet AGN
36,132,566
1
FRI
23,853,134
3
FRII
2,354
5
“Normal” galaxies
168,046,330
1
Starburst galaxies
7,267,382
1
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 database
Source 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
Input map parameters
region - source types - resolution - frequency - flux limit
Query databases
Read structure
information
position - size - orientation - reference fluxes
Build template image
Compute flux
Scale template image
Paste into full map
Making the SKADS HI line sky (I)
First approach @ low resolution : synthetic
spectra
HI flux
Synthetic double-peaked shape
Making the SKADS HI line sky (II)
Second approach @ high resolution : template cubes from R.
Boomsma
•
•
•
•
•
•
Galaxy models made of “clouds”
Placed according to density profile
Orbiting according to velocity curve
5 galaxy types (spirals and irregulars)
QuickTime™ and a
Animation decompressor
are needed to see this picture.
46 inclination values (0-90 degrees)
5 asymptotic velocities
scale / rotate / paste
S0-Sab
Map Maker
•
•
•
Standalone application in Python /
IDL
SQL/Python interface
FITS output
Central square degree of the continuum
simulations
Radio-quiet AGN
“Normal” galaxies
FR I
FR II
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
Measurement Set Generator
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