create_low_test_image_from_gleam

create_low_test_image_from_gleam(npixel=512, polarisation_frame=<ska_sdp_datamodels.science_data_model.polarisation_model.PolarisationFrame object>, cellsize=1.5e-05, frequency=array([1.e+08]), channel_bandwidth=None, phasecentre=None, kind='cubic', applybeam=False, flux_limit=0.1, flux_max=inf, flux_min=-inf, radius=None, insert_method='Nearest') → Image[source]

Create LOW test image from the GLEAM survey

Stokes I is estimated from a cubic spline fit to the measured fluxes. The polarised flux is always zero.

See http://www.mwatelescope.org/science/gleam-survey The catalog is available from Vizier.

VIII/100 GaLactic and Extragalactic All-sky MWA survey (Hurley-Walker+, 2016)

GaLactic and Extragalactic All-sky Murchison Wide Field Array (GLEAM) survey. I: A low-frequency extragalactic catalogue. Hurley-Walker N., et al., Mon. Not. R. Astron. Soc., 464, 1146-1167 (2017), 2017MNRAS.464.1146H

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)

  • kind – Kind of interpolation (see scipy.interpolate.interp1d) Default: linear

  • radius – radius of search area in radians (Default is half-width of the diagonal)

Returns:

Image