create_test_image_from_s3
- create_test_image_from_s3(npixel=16384, polarisation_frame=<ska_sdp_datamodels.science_data_model.polarisation_model.PolarisationFrame object>, cellsize=1.5e-05, frequency=array([1.e+08]), channel_bandwidth=array([1000000.]), phasecentre=None, fov=20, flux_limit=0.001) Image [source]
Create MID test image from S3
- The input catalog was generated using the following query::
Database: s3_sex SQL: select * from Galaxies where (pow(10,itot_151)*1000 > 1.0) and (right_ascension between -5 and 5) and (declination between -5 and 5);;
Number of rows returned: 29966
For frequencies < 610MHz, there are three tables to use:
data/models/S3_151MHz_10deg.csv, use fov=10 data/models/S3_151MHz_20deg.csv, use fov=20 data/models/S3_151MHz_40deg.csv, use fov=40
For frequencies > 610MHz, there are three tables:
data/models/S3_1400MHz_1mJy_10deg.csv, use flux_limit>= 1e-3 data/models/S3_1400MHz_100uJy_10deg.csv, use flux_limit < 1e-3 data/models/S3_1400MHz_10uJy_10deg.csv, use flux_limit < 1e-4 data/models/S3_1400MHz_1mJy_18deg.csv, use flux_limit>= 1e-3 data/models/S3_1400MHz_100uJy_18deg.csv, use flux_limit < 1e-3
The component spectral index is calculated from the 610MHz and 151MHz or 1400MHz and 610MHz, and then calculated for the specified frequencies.
If polarisation_frame is not stokesI then the image will a polarised axis but the values will be zero.
- Parameters:
npixel – Number of pixels
polarisation_frame – Polarisation frame (default PolarisationFrame(“stokesI”))
cellsize – cellsize in radians
frequency –
channel_bandwidth – Channel width (Hz)
phasecentre – phasecentre (SkyCoord)
fov – fov 10 | 20 | 40
flux_limit – Minimum flux (Jy)
- Returns:
Image