Other fields contain enough sources for astrometric calibration, but problems arise at the SWarp stage.
The images are then shifted (according to the astrometric calibration) and scaled (according to photometric calibration) and stacked using SWarp.
A pixel grid that contains all the images is set up by running SWarp once to generate a header.
Several of the tools that go into MegaPipe (AstroGwyn, SExtractor, SWarp) were originally developed for use for high galactic latitude fields.
If the extended emission has sharp variations (such as the spiral arm of a nearby galaxy), SWarp's background subtraction can produce peculiar results.
A breeder of chickens Australian Allan Swarp, called "Swampy" has decided to try to defend the colony of penguins to Middle Island of Warrnambool's using some shepherds Maremmano Abruzzesi...
If the extended emission varies smoothly and slightly (as in a large nebula) SWarp's background subtraction removes the extended emission at the same time as it removes the sky background, leaving a blank field.
Other fields contain enough sources for astrometric calibration, but problems arise at the SWarp stage.
The images are then shifted (according to the astrometric calibration) and scaled (according to photometric calibration) and stacked using SWarp.
A pixel grid that contains all the images is set up by running SWarp once to generate a header.
Several of the tools that go into MegaPipe (AstroGwyn, SExtractor, SWarp) were originally developed for use for high galactic latitude fields.
If the extended emission has sharp variations (such as the spiral arm of a nearby galaxy), SWarp's background subtraction can produce peculiar results.
A breeder of chickens Australian Allan Swarp, called "Swampy" has decided to try to defend the colony of penguins to Middle Island of Warrnambool's using some shepherds Maremmano Abruzzesi...
If the extended emission varies smoothly and slightly (as in a large nebula) SWarp's background subtraction removes the extended emission at the same time as it removes the sky background, leaving a blank field.
Requêtes fréquentes français :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
Requêtes fréquentes anglais :1-200, -1k, -2k, -3k, -4k, -5k, -7k, -10k, -20k, -40k, -100k, -200k, -500k, -1000k,
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