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Astronomy and Cosmology
Astronomy and Astrophysics
Can you me with this Hershel telescope beam?
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[QUOTE="laner, post: 5495489, member: 580826"] From the PACS observers manual: "For fast scans in normal and parallel mode, this PSF structure is smeared by detector time constants and data averaging." [URL]http://herschel.esac.esa.int/Docs/PACS/html/ch03.html#sec-characteristics-photometer[/URL] See Table 3.1 in that link. Are you referring to the doubling of the FWHM from 5.26 x 5.61 at 10"/s to 5.75 x 9.0 at 60"/s with the Blue detector? If so then that's only along the spacecraft z-direction, which, as the mention above, is due to the increased scan speed. PACS is a bolometer so it doesn't bin photons, it reads a change in temperature due to those photons as a signal instead. When the spacecraft scans faster the thermal properties of the detector mean it can't respond as fast so you smear the temperature-based signal through time, which translates into spatial resolution. Also that signal comes out as a time series, which must be sampled, so I assume that's what they mean when they refer to data averaging. I don't have a lot of experience directly with Herschel but I've worked with other bolometric imaging systems so this is just my take on their manual. [/QUOTE]
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Astronomy and Astrophysics
Can you me with this Hershel telescope beam?
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