Spiral Galaxy Messier 100 (FORS/VLT)
March 2, 2006
This photo is a composite based on five images taken with FORS1 on Kueyen (VLT) by Dominique Naef, Eric Depagne and Chris Lidman (ESO). The images were taken through different filters: U, V, R, I, and a narrow-band filter centred on the H-alpha line. The exposure time is 60 seconds in the V, R and I filters, 3 minutes in the U-band and 5 minutes in the H-alpha filter. The field of view is 6.8 x 5.1 arcmin2. North is up and East is to the left. The final processing was done by Kristina Boneva, Haennes Heyer and Henri Boffin (ESO).
Topics: Filter theory, Very Large Telescope, Telescopes, H-alpha, Messier 100, Electronic filter, Filter, Spiral galaxies, European Southern Observatory, signal processing