Celestial hemisphere:  Northern  ·  Constellation: Ursa Major (UMa)  ·  Contains:  Bode's Galaxy  ·  Cigar Galaxy  ·  M 81  ·  M 82  ·  NGC 2959  ·  NGC 2961  ·  NGC 2976  ·  NGC 3031  ·  NGC 3034  ·  NGC 3077  ·  PGC 139216  ·  PGC 166101  ·  PGC 213630  ·  PGC 2703724  ·  PGC 2703987  ·  PGC 2705790  ·  PGC 2705812  ·  PGC 2706439  ·  PGC 2706525  ·  PGC 2706916  ·  PGC 2707214  ·  PGC 2708107  ·  PGC 2708570  ·  PGC 2708671  ·  PGC 2709184  ·  PGC 2709520  ·  PGC 2711212  ·  PGC 2717858  ·  PGC 2719634  ·  PGC 2720339  ·  And 126 more.
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M81 & Co among a lot of IFN, Göran Nilsson
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M81 & Co among a lot of IFN

Getting plate-solving status, please wait...
M81 & Co among a lot of IFN, Göran Nilsson
Powered byPixInsight

M81 & Co among a lot of IFN

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This is an area well known for its Integrated Flux Nebulosity (Galactic Cirrus), but rarely this much is seen. Thanks to the new XTerminator procedures (BlurXT, StarXT and NoiseXT) I could bring out quite a lot of it from this data, and @Wim van Berlo  kindly gave me Ha data (caught with his MN190) to add to M81. The Ha flares in M82 was actually strong enough to be picket up buy the RASA8 - ASI2600MC combo without a filter.

In response to this post @Alan Brunelle PM-ed me some interesting information about the dust close to M81. Arp initially thought that it was galactic material (so it became known as Arp's loop) but it was later dismissed as IFN. Alan suggests it may be a mix of both, and I am inclined to agree. Especially the bluish areas in Arp's loop could be from M81. He pointed at this interesting paper (https://iopscience.iop.org/article/10.3847/1538-4357/aad557#apjaad557s3) and in it this figure reveals some clear interactions between there galaxies:
apjaad557f6_lr.jpg

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