Table 1
FWHM of the PACS PSF for several important cases.
| Mode | AMA | BS 70 μm | BS 100 μm | R 160 μm | |||
|---|---|---|---|---|---|---|---|
| FWHM | PA | FWHM | PA | FWHM | PA | ||
| ° | ″ | ° | ″ | ° | ″ | ° | |
| Prime 10″s−1 | +63 | 5.20× 5.56 | 6.54 × 6.78 | 10.38 × 11.97 | 6.1 | ||
| Prime 20″s−1 | +63 | 5.41 × 5.72 | 6.66 × 6.89 | 10.55 × 12.08 | 9.1 | ||
| Prime 60″s−1 | +63 | 5.70 × 9.05 | 61.7 | 6.84 × 9.81 | 61.8 | 11.39 × 13.37 | 41.2 |
| Parallel 20″s−1 | +42 | 5.44 × 6.51 | 30.8 | 6.62 × 7.44 | 31.1 | 10.29 × 12.20 | 8.5 |
| Parallel 20″s−1 | −42 | 5.31 × 6.68 | −26.5 | 6.53 × 7.56 | −27.0 | 10.37 × 12.27 | −3.4 |
| Parallel 60″s−1 | +42 | 5.85 × 12.58 | 43.7 | 6.99 × 13.15 | 43.9 | 10.90 × 14.09 | 27.7 |
| Parallel 60″s−1 | −42 | 5.69 × 12.74 | −36.9 | 6.87 × 13.41 | −37.1 | 11.01 × 14.53 | −23.7 |
| Parallel 20″s−1 | +42,−42 | 5.74 × 6.26 | 0.4 | 6.98 × 7.42 | −2.9 | 10.46 × 12.27 | 3.1 |
| Parallel 60″s−1 | +42,−42 | 8.80 × 9.60 | −4.4 | 9.73 × 10.69 | −3.8 | 11.51 × 13.65 | 5.3 |
Notes. Two-dimensional Gaussian fits were used to derive the FWHM for the small and large axes. For noticeably non-round PSF cores, the position angle east of the spacecraft Z direction is noted. The array to map angle (AMA) of the scan is also specified. The maps used to derive the FWHM were created by photProject with a map pixel size 1″ and pixfrac=1. Entries above the line refer to single direction scans, showing the in-scan elongation for fast scan and for Parallel mode. Entries below the line refer to co-added Parallel mode crossed scans, where a cross-like PSF emerges from co-adding the two elongated PSFs.
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