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20-23 Feb-17 Andy Casely

NGC1760 complex - 3 ways

Loftus, NSW

NGC1760 is a giant star-forming complex in the Large Magellanic Cloud, a satellite galaxy of our Milky Way. It is about 1,000 light-years across, and is one of the biggest objects of its kind (for comparison, the Great Orion Nebula is only 24 light-years wide, but is much closer to us). It is a huge ring of gas, the centre has been hollowed out by a cluster of hot blue supergiant stars, and more star-formation is happening in the bright knots of gas around the ring. There are some other interesting features, including some other star clusters, an unusual tadpole-shaped bubble of gas (supernova remnant?), and even a few background galaxies.

I had an unusually good run of clear skies in Sydney, giving me the chance to image the same object over 3 separate nights, this is an amalgamation of about 6 hours of data across all CCD filters.

There are 3 versions of this image:
* LRGB roughly corresponds to the visual appearance - the hot blue stars and clusters dominate the scene along with millions of other stars in the LMC - and the deep red of the hydrogen is relatively dim except in the brightest knots of nebulosity.
* Hydrogen Alpha captures the emission of the hydrogen gas, using a 12nm hydrogen alpha filter. This shows the structures of the gas rings and bubbles much more clearly.
* Ha-LRGB is a combination of all the data. It's a compromise between the brilliance of the hot blue stars, and highlighting the gas clouds, and it creates a colourful scene.

Ha-LRGB combination (100,140,40,40,40) @ 5min exposures - 6 hours total integration. Atik 460EX, Astronomik deep sky LRGB filters, Astronomik 12nm H-alpha filter, flats & bias corrected. 200mm f/5 Newtonian, HEQ5Pro, processed in PixInsight. full exif

other sizes: small medium large original auto
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