This VELA SNR image was built as a mosaic out of 4 parts (quarters).
Total exposures: 127 x 5 minutes using H-Alpha filter, and 200 x 5 minutes using OIII filter.
We used the Telescope T8 at i-Telescope in Siding Springs Australia
http://support.itele...911-telescope-8
During image processing i tried to create the RGB image using
OIII images
http://www.werbeagen..._oiii_small.jpg
and H-Alpha images
http://www.werbeagen...c2_ha_small.jpg
Color mixture details:
Ha only into the red channel, OIII with different percentages into the green and blue channel.
More details can be found on Astrobin:
https://www.astrobin...353057/?nc=user
All image processing was done with PixInsight.
The whole project is a Cooperation between
Dr. Franz Gruber
http://www.natscienc...e=sites/galerie.
and me:
http://www.werbeagen...xi/gallery.html
http://www.werbeagentur.org/oldwexi/...a_SNR_576x.jpg
We started the exposure series in November 2017 and took the last pictures of the lower right quarter of the mosaic in June 2018.
Full size image 3781x3865 pixels
http://www.werbeagen...ky/Vela_SNR.jpg
Full size image 3781x3865 with the object labels including Vela SNR Pulsar can be found here:
http://www.werbeagen...R_Annotated.jpg
The Vela SNR within the GUM 12 Nebula
Object description by Dr. Thomas Schröfl:
About 11,000 - 12,300 years ago, in the constellation Vela, at a distance of slightly more than 800 light years, a star exploded as a type II supernova whose expanding gas shells have since then formed the Vela SNR (Supernova Remnant). The Vela Pulsar, the remnant of the starting star, was observed by astronomers at the University of Sydney in 1968 as the first direct evidence of a neutron star as a result of a supernova.. The Vela SNR extends around 100 light years. The most dominant single object there is NGC2736 the so called "pencil nebula" (in the middle left of the image). The Vela SNR overlaps with the SNR of Puppis A which is with a distance of 700 lightyears located far behind the Vela SNR. Both SNR are located within the large GUM nebula (GUM 12) which extend to more than 40 degrees in the constellations Vela and Puppis. The GUM nebula has a spherical extension where the nearer part is 450 lightyears away and the far away part has a distance of 1500 lightyears. Scientists assume that the GUM nebulas creation (Supernova Vela X?) happened more than a million years ago. The visible gaseous rest still extend with a speed of 20km/s. The are different models to explain how one SN can create so much UV-radiation to ionisize such a large extended region.
Very good visible are a lot of fine and crispy OIII structures, but less of this kind in the H-Alpha areas. Could not find explanations for these differences. H-Alpha shows much less sharp shock fronts, they are distributed more diffuse.
There are different formations in the OIII areas, arcs and circles which do not look like beeing born at the same event.
. )
