G127.1+0.5 - THE SHY SNRThe supernova remnant G127.1+0.5 was discovered as early as 1965 and has since been studied mainly in the radio and infrared range, i.e. outside the visible spectrum.
Many years have passed since the discovery until the first attempts were made to detect the emission shell of this SNR in the visible range of the electromagnetic spectrum.
This endeavor poses a great challenge to astrophotographers, as the SNR is hidden behind numerous dark dust clouds and a bright HII nebula that dominates this region.
Due to these blocking influences, hardly any signals penetrate the visible spectrum, which gave the team a headache.
However, with the current image, our team has finally succeeded in making the structures and large parts of the emission shell of this very shy supernova remnant clearly visible for the first time.
The team not only relied on the use of a very narrow-band SII filter, which brought out most of the details, but also developed their own color palette to optically separate the ionized gases H-alpha and SII, which normally both emit red light. In addition, the raw data were processed using special subtraction techniques to remove interfering influences from the narrowband data and to obtain emission lines that were as pure as possible.
How was this image created?
Our team is always looking for challenges and G127.1+0.5 was considered an almost impossible object to image until the end of last year.
But some research and analysis showed that there are ways to capture the timid SNR.
So the team at the Hight Atlas Observatory in Oukaimeden (Morocco) set to work.
The first tests were not very encouraging, as only a part (in the south) of the SNR was visible and the rest was obscured by dust clouds.
Furthermore, we found no trace of [Oiii] in the visible part, but to our great surprise the SNR seemed to show more details in the SII range than in the otherwise very dominant H-alpha.
Comparison between optical and radio :
This color palette is a false color representation that does not reflect the true colors. The team has developed a custom palette to process the picture of this object. It is a palette inspired by HSORGB.
As the SNR is very faint, it took over 62 hours of exposure under the excellent HAO sky of Oukaimeden Observatory to create this image.
Ha :
[Oiii] :
Sii :
RGB :
Find out more here:
https://arxiv.org/pdf/astro-ph/0601487.pdfhttps://www.researchgate.net/publication/234407415_Detection_of_optical_emission_in_the_area_of_G127105 
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