Recovering the Spectral and Spatial Information

After the three sets of interferograms have been generated for the single slit aperture, the double slit aperture and the double slit with one of the apertures spectrally Altered, the simulated interferograms are processed to exttact the spatial and spechal informaAon. The next Agures show the results obtained for each of these scenarios for an ideal instmment. 

For comparison, in Fig.5.23 the normalised dirty beam at 21cm (left) and 35 cm (right) is shown. In Fig. 5.22 (left) the width of the detected spatial map is bigger than the width of the dirty beam at 21 cm due to the convolution of the beam with the spatial map. 

For the case of the ideal double slit aperture presented in Fig. 5.24, the spatial position of the two apertures (left) is recovered. Again, the sources are unresolved and so the shape of the spatial map is the sum of the two dirty beams. The recovered spectra (right) for the aperture situated at the negative part of the FOV (blue) and for the aperture at the right part of the FOV (green) is consistent with the input spectrum. The amplitude variation between the 4 pixels that define each aperture is due to the interferometric dirty beam, as in the previous case. 

The results just presented correspond to a simulation where no errors have been introduced, which is the ideal case scenario. The next plots correspond to the same simulations (single slit aperture, double slit aperture and double slit with a low-pass Alter on one of the slits) when instrumental errors are introduced. 

SpeciAcally, the sources of errors implemented are the system NEP extracted from laboratory measurements, with a value of NEP = 2.8 pWthe bolometer time 

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