Which linmos PB correction is right for wide-band data?
Posted: Thu Oct 29, 2015 8:05 pm
Hi all,
I'm trying to understand the two different ways in which linmos performs the primary beam correction. Under the "bw" keyword in the linmos help file, it says:
"Bandwidth of the image in GHz, default 0. If specified the beam response will either be averaged across the frequency band before being applied to the image or, if the input images contain a spectral index plane (created with the mfs option of restor) the images will be evaluated and corrected across the band. Use this for wide band images to improve the accuracy of the correction."
Which correction should I use? I am trying to make a full-band mosaic using the full-band reduction of 471 pointings (which have spectral index planes) imaged at 1-3 GHz (2.0 GHz bandwidth, so delta_nu/nu~1).
Could you please briefly explain the difference between these two different ways that linmos does the primary beam correction and give a recommendation?
Thanks,
Andrew
I'm trying to understand the two different ways in which linmos performs the primary beam correction. Under the "bw" keyword in the linmos help file, it says:
"Bandwidth of the image in GHz, default 0. If specified the beam response will either be averaged across the frequency band before being applied to the image or, if the input images contain a spectral index plane (created with the mfs option of restor) the images will be evaluated and corrected across the band. Use this for wide band images to improve the accuracy of the correction."
Which correction should I use? I am trying to make a full-band mosaic using the full-band reduction of 471 pointings (which have spectral index planes) imaged at 1-3 GHz (2.0 GHz bandwidth, so delta_nu/nu~1).
Could you please briefly explain the difference between these two different ways that linmos does the primary beam correction and give a recommendation?
Thanks,
Andrew