compute_fwhm

stellarphot.photometry.source_detection.compute_fwhm(ccd, sources, fwhm_estimate=5, x_column='xcenter', y_column='ycenter', fit=True, sky_per_pix_avg=0)

Computes the FWHM in both x and y directions of sources in an image.

Parameters:

ccdastropy.nddata.CCDData

The CCD Image array.

sourcesastropy.table.Table

An astropy table of the positions of sources in the image.

fwhm_estimatefloat, optional (default=5)

The initial guess for the FWHM of the sources in the image.

x_columnstr, optional (default=’xcenter’)

The name of the column in sources that contains the x positions of the sources.

y_columnstr, optional (default=’ycenter’)

The name of the column in sources that contains the y positions of the sources.

fitbool, optional (default=True)

If True, fit a 2D Gaussian to each source to estimate its FWHM. If False, estimate the FWHM of each source by computing the second moments of its light distribution using photutils.

sky_per_pix_avgfloat or array-like of float, optional (default=0)

Sky background to subtract before centroiding.

Returns:

fwhm_x, fwhm_ytuple of np.array float

The FWHM of each source in the x and y directions.