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While clouded in and waiting for knee surgery, I started playing with data from the Liverpool Telescope (http://telescope.livjm.ac.uk/). I downloaded all the NSO data on NGC 2841, a very nice flocculent galaxy in Ursa Major, and started processing in PixInsight. While I couldn't get anywhere with the colour of this galaxy, the luminance created from the combined filters revealed structures that I've never seen before in an image of this galaxy.
I combined a colour image of NGC2841 with an inverted superstretch of the combined SDSS-r, Bessell-V, and Bessell-B filters.
Red: 35 frames SDSS-r' Green: 16 frames Bessell-V Blue: 20 frames Bessell-B L image:
integration of all 71 frames, approximately 100 minutes total exposure time. Field size: roughly 10 x 10 arcminutes.
The arrow points at a weak loop, and the circle shows a slight density increase in the weak structure.
I didn't realise there was data on this in the School's Observatory archive until I posted a question on the forum. It turns out that you have to have a teacher or student account as the data is in the GCSE Astronomy section.
When I looked I found a lot of images, this is just 120 seconds of R, G, And B. I had to do a gradient removal and a DDP followed by a couple of histogram stretches, ending with a lw-pass filter to get rid of the noise.
The rest of the images in the archive are just 60 and 90 sec which might be OK for preserving the cores.
There's more structure in the image, including the tidal tail but it's very noisy.
As many of you probably already know, Göran Nilsson (@gorann) and I have been processing images from the Liverpool Telescope archives this spring/summer.
After we had hoovered most of the archives, Göran contacted the LT management about our effort. As a result, we were offered to publish our images in their gallery. Now they even presented our work as a news item on the LT website.
Just wanted to share this time lapse of the Liverpool Telescope at work.
Note the large number of movements the scope makes during one night. Every time you see it tracking the night sky, is one imaging session. The data captured during such sessions, is representative of what @gorann and I have been working on for the past time.
Also note that the 'obsy' is completely remote controlled. You can see the various instruments being changed in this video.
This image may compete for being one of the worst framings ever.
It is an RGB image that I processed from free data from the Liverpool Telescope, a 2 m RC reflector on La Palma. This time with quite a lot of data, so not much noise and a lot of detail. The "only" problem is that the astronomers requesting the subs must only have cared about NGC 3187 and the beautiful NGC 3190 just happened to be partly included.
Found this nice info about these galaxes on the Canary Islands Astronomical Institute www.iac.es:
Discovered by Sir William Herschel in 1784, NGC 3190 and NGC 3187 are two spiral galaxies seen nearly edge-on. The spiral arms of NGC 3190 are tightly wrapped around its nucleus, and those of NGC 3187 are S-shaped. Both galaxies are located in the constellation Leo and are members of the Hickson 44 galaxy group, located about 70 million light years from Earth. The galaxies in this group are very close to each other so that gravitational interactions are common, resulting in a high degree of shape distortion and a high rate of star formation in many cases. This gravitational dance will eventually end up in many galaxy mergers.
Filters and exposures used (from 2015 01 21 - 2016 04 26).
sdss-r 40 x 90 s (red channel)
Bessell V 23 x 90 s (green channel)
Bessell B + sdss-g 53 x 90 s (blue channel)