Source parameters

enum sourcefinder.utility.sourceparams.SourceParams(value)

Enumeration of source parameters that can be measured and stored.

Member Type:

str

Valid values are as follows:

PEAK = <SourceParams.PEAK: 'peak'>

Peak spectral brightness of the source (Jy/beam)

PEAK_ERR = <SourceParams.PEAK_ERR: 'peak_err'>

1-sigma uncertainty in the peak spectral brightness of the source (Jy/beam)

FLUX = <SourceParams.FLUX: 'flux'>

Flux density of the source, calculated as ‘pi * peak spectral brightness * semi- major axis * semi-minor axis / beamsize’ (Jy)

FLUX_ERR = <SourceParams.FLUX_ERR: 'flux_err'>

1-sigma uncertainty in the flux density (Jy)

X = <SourceParams.X: 'x'>

x-position (float) of the barycenter of the source, correponding to the row index of the Numpy array with image data. After loading a FITS image, the data is transposed such that x and y are aligned with ds9 viewing, except for an offset of 1 pixel, since the bottom left pixel in ds9 has x=y=1

X_ERR = <SourceParams.X_ERR: 'x_err'>

1-sigma uncertainty in the x-position (float) of the barycenter of the source, corresponding to the row index of the Numpy array with image data

Y = <SourceParams.Y: 'y'>

y-position (float) of the barycenter of the source, correponding to the column index of the Numpy array with image data. After loading a FITS image, the data is transposed such that x and y are aligned with ds9 viewing, except for an offset of 1 pixel, since the bottom left pixel in ds9 has x=y=1

Y_ERR = <SourceParams.Y_ERR: 'y_err'>

1-sigma uncertainty in the y-position (float) of the barycenter of the source, corresponding to the column index of the Numpy array with image data

SMAJ = <SourceParams.SMAJ: 'smaj'>

Semi-major axis of the Gaussian profile, not deconvolved from the clean beam (pixels)

SMAJ_ERR = <SourceParams.SMAJ_ERR: 'smaj_err'>

1-sigma uncertainty in the semi-major axis, not deconvolved from the clean beam (pixels)

SMIN = <SourceParams.SMIN: 'smin'>

Semi-minor axis of the Gaussian profile, not deconvolved from the clean beam (pixels)

SMIN_ERR = <SourceParams.SMIN_ERR: 'smin_err'>

1-sigma uncertainty in the semi-minor axis, not deconvolved from the clean beam (pixels)

THETA = <SourceParams.THETA: 'theta'>

Position angle of the major axis of the Gaussian profile, measured from the positive y-axis towards the negative x-axis (radians)

THETA_ERR = <SourceParams.THETA_ERR: 'theta_err'>

1-sigma uncertainty in the position angle of the major axis of the Gaussian profile, measured from the positive y-axis towards the negative x-axis (radians)

SMAJ_DC = <SourceParams.SMAJ_DC: 'smaj_dc'>

Semi-major axis of the Gaussian profile, deconvolved from the clean beam (pixels)

SMAJ_DC_ERR = <SourceParams.SMAJ_DC_ERR: 'smaj_dc_err'>

1-sigma uncertainty in the semi-major axis, deconvolved from the clean beam (pixels)

SMIN_DC = <SourceParams.SMIN_DC: 'smin_dc'>

Semi-minor axis of the Gaussian profile, deconvolved from the clean beam (pixels)

SMIN_DC_ERR = <SourceParams.SMIN_DC_ERR: 'smin_dc_err'>

1-sigma uncertainty in the semi-minor axis, deconvolved from the clean beam (pixels)

THETA_DC = <SourceParams.THETA_DC: 'theta_dc'>

Position angle of the major axis of the Gaussian profile, deconvolved from the clean beam, measured from the positive y-axis towards the negative x-axis (degrees)

THETA_DC_ERR = <SourceParams.THETA_DC_ERR: 'theta_dc_err'>

1-sigma uncertainty in the position angle of the major axis of the Gaussian profile, deconvolved from the clean beam, measured from the positive y-axis towards the negative x-axis (degrees)

RA = <SourceParams.RA: 'ra'>

Right ascension of the source (degrees)

RA_ERR = <SourceParams.RA_ERR: 'ra_err'>

1-sigma uncertainty in right ascension (degrees)

DEC = <SourceParams.DEC: 'dec'>

Declination of the source (degrees)

DEC_ERR = <SourceParams.DEC_ERR: 'dec_err'>

1-sigma uncertainty in declination (degrees)

SMAJ_ASEC = <SourceParams.SMAJ_ASEC: 'smaj_asec'>

Semi-major axis of the Gaussian profile, not deconvolved from the clean beam (arcseconds)

SMAJ_ASEC_ERR = <SourceParams.SMAJ_ASEC_ERR: 'smaj_asec_err'>

1-sigma uncertainty in the semi-major axis, not deconvolved from the clean beam (arcseconds)

SMIN_ASEC = <SourceParams.SMIN_ASEC: 'smin_asec'>

Semi-minor axis of the Gaussian profile, not deconvolved from the clean beam (arcsecond)

SMIN_ASEC_ERR = <SourceParams.SMIN_ASEC_ERR: 'smin_asec_err'>

1-sigma uncertainty in the semi-minor axis, not deconvolved from the clean beam (arcseconds)

THETA_CELES = <SourceParams.THETA_CELES: 'theta_celes'>

Position angle of the major axis of the Gaussian profile, measured east from local north (degrees)

THETA_CELES_ERR = <SourceParams.THETA_CELES_ERR: 'theta_celes_err'>

1-sigma uncertainty in the position angle of the major axis of the Gaussian profile, measured east from local north (degrees)

THETA_DC_CELES = <SourceParams.THETA_DC_CELES: 'theta_dc_celes'>

Position angle of the major axis of the Gaussian profile, deconvolved from the clean beam, measured east from local north (degrees)

THETA_DC_CELES_ERR = <SourceParams.THETA_DC_CELES_ERR: 'theta_dc_celes_err'>

1-sigma uncertainty in the position angle of the major axis of the Gaussian profile, deconvolved from the clean beam, measured east from local north (degrees)

ERROR_RADIUS = <SourceParams.ERROR_RADIUS: 'error_radius'>

The absolute angular error on the position of the source (arcseconds). This is a pessimistic estimate, because we try all possible combinations of the x and y errors, and take the maximum for the four combinations.

SIG = <SourceParams.SIG: 'sig'>

The significance of a detection (float) is defined as the maximum signal-to-noise ratio across the island. Often this will be the ratio of the maximum pixel value of the source divided by the noise at that position.

CHISQ = <SourceParams.CHISQ: 'chisq'>

The chi-squared value of the Gaussian model relative to the data (float). Can be a Gaussian model derived from a fit or from moments. See the measuring.goodness_of_fit docstring for some important notes.

REDUCED_CHISQ = <SourceParams.REDUCED_CHISQ: 'reduced_chisq'>

The reduced chi-squared value of the Gaussian model relative to the data (float). Can be a Gaussian model derived from a fit or from moments. See the measuring.goodness_of_fit docstring for some important notes.