Table 1
Applied scan map parameters for the input maps of the PSF fitting step.
| Filter | FWHMPSF | outpix | HPF radius (a) | pixfrac |
|---|---|---|---|---|
| (μm) | (″) | (″) | ||
| 70 | 5.6 | 1.1 | 15, 20, 35 | 0.1, 0.5, 1.0 |
| 100 | 6.8 | 1.4 | 15, 20, 35 | 0.1, 0.5, 1.0 |
| 160 | 10.7 | 2.1 | 30, 40, 70 | 0.1, 0.5, 1.0 |
Notes. FWHMPSF is the average full width at half maximum of the PSF for a point-like source in the corresponding filter. “Outpix” marks the output pixel size in the final map. This was kept constant, which means a sampling of the PSF FWHM by 5 pixels in each filter. “HPF” is the abbreviation for the high-pass filter, “pixfrac” is the ratio of drop size to input pixel size used for the drizzling algorithm (Fruchter & Hook 2002) within the photProject() mapper. (a) This parameter determines the elementary section of a scan over which the high-pass filter algorithm computes a running median value. Its unit is “number of read-outs”. The spatial interval between two readouts is
. For the standard νro = 10 Hz read-out scheme in PACS prime mode, and a scan speed vscan = 20" s−1, the spatial interval αro between two read-outs corresponds to 2". The entire width of the HPF window (") = [(2 × HPF radius) + 1] × αro.
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