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A Supernova remnant near P Cyg?

NGC6888 Supernova Remnant NGC Objects Deep Sky Nebula
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Frank Tschepke avatar
Frank Tschepke avatar
In my image of NGC6888 and the Soap bubble nebula:  https://www.astrobin.com/fugn8c/0/

I see quite a lot of ha- and OIII-filaments near P Cyg (to the left of the bubble) that remind me of parts of the Veil nebula. They are most clearly visible in the starless HOO version:
https://www.astrobin.com/full/6qi618/0/?mod=&real=

Is this (part of) some supernova remnant?  Or something entirely different? Does someone have and/or can point me to information about it? 

Doing an quick search on astrobin I could not find similar images. Googling "supernova remnants in Cygus" I found  a list of supernova remnants catalogued as x-ray sources; this list has  CTB87 or G074.9+01.2 roughly in this area, but I could not find any images or information of Veil-like structures in ha and OIII. 

Any information/hints much appreciated!

Best regards,

Frank
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Tony Gondola avatar
Tony Gondola avatar
Why not try "what's in my image?" I think it's available on PI. It's also in the free Seti Astro Suite program. It's a must have and really fun to play with. I would be surprised if it didn't help you with identification of what you're seeing.
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andrea tasselli avatar
andrea tasselli avatar
There are several SNRs in Cygnus, usually only visible in the X/Radio band but a few have an optical counterpart. In your case this is the catalogued counterpart, I believe (not guaranteed is a SNR though):

[GS55] 194

It may have been observed before by professional astronomers though…
Taman avatar
Taman avatar
The OIII nebulosity also shows clearly in my own image: https://app.astrobin.com/i/842tap?r=B

Here's a link to another image of it: https://cxielo.ch/project/p-cygni-nebula/

and the discovery paper at: https://www.aanda.org/articles/aa/pdf/2006/37/aa6039-06.pdf

Hope this helps, CS, Tony.
Frank Tschepke avatar
Frank Tschepke avatar
Thanks a lot, Tony, Andrea and Tony!  That made for a lot of interesting reading!

I had indeed looked at the P Cyg area using SetiAstros fabulous WhatsInMyImage-tool  (and before that TypeCat, which also uses SIMBAD data). No SNR are shown in this area, and I also didn't find information on the nebula around P Cyg.

Reading about the Gaze and Shajn catalogue from 1955 was interesting (I had not heard of it before), but unfortunately I could not access their original catalogue and did not find out a lot about [GS55] 194.  Stellarium shows its position very close to P Cyg but does not give much information about its nature or properties.

Tony's link to the paper by Boumis et al.  and the group's earlier paper https://www.aanda.org/articles/aa/pdf/2004/29/aa0096-04.pdf  quoted there really cleared things up:  The two papers are making the case (by spectroscopically measuring the Doppler shifts of the emission lines) that the filaments near P Cyg, in particular those seen in OIII, are not (part of) a SNR but are associated with P Cyg itself: The lobe of nebulosity seen  in OIII images consists of gas emitted by P Cyg in the last couple of thousand (or ten thousand) years. 

So no catalogue entry to be found for a SNR near P Cyg, and the OIII lobe also does not seem to have a catalogue number.

Best regards,

Frank
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Taman avatar
Taman avatar
Frank Tschepke:
Reading about the Gaze and Shajn catalogue from 1955 was interesting (I had not heard of it before), but unfortunately I could not access their original catalogue and did not find out a lot about [GS55] 194.  Stellarium shows its position very close to P Cyg but does not give much information about its nature or properties.

Hi Frank, I did a bit more digging and found what looks to be the catalogue here: https://clearskies.eu/csog/downloads/nebulae/#gazeshajn There are also a lot of other catalogues available, but the website requires you to register and make a "donation" before you can download anything. CS, Tony.
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Kay Ogetay avatar
Kay Ogetay avatar
Frank, I noticed this and imaged the area for 50 hours in Oiii. You can also find some information at the time I had: https://app.astrobin.com/u/OgetayKayali?i=6cxlhx#gallery

Unfortunately, I could not find time to dig further. There are certainly publications that mention filament-like structures around it, but the mentioned structures aren't this big. There is also another bowshock-like object in the area that I was not able to identify.