M77 and NGC1055 (Mark Mabry)

M77 and NGC1055

M77 is a barred spiral galaxy, with quite a set of spiral arms. It was thought to be a star cluster when discovered about 1780 by Mechain and added to Messier's catalog. Later reclassified as a spiral galaxy with tightly wound arms. Finally, infrared images of the inner part of the galaxy reveal a prominent bar not seen in visual light, and for this reason it is now considered a barred spiral.

M77 is a prime example of a Seyfert galaxy, or a galaxy with an intensely active center that is obscured by gas and dust in visible light.

One cool and very recent fact: In November 2022, the IceCube collaboration announced the detection of a neutrino source emitted by the active galactic nucleus of Messier 77. This is only the 4th known source of neutrinos, including our Sun.

NGC 1055 is an edge-on galaxy. It has a prominent nuclear bulge crossed by a wide, knotty, dark lane of dust and gas. It is slightly larger than our Milky Way galaxy, 100,000 light years across.

NGC 1055 has a boxy halo that extends far above and below the central bluge and disk of NGC 1055. The halo itself is laced with faint, narrow structures, and could represent the mixed and spread out debris from a satellite galaxy disrupted by the larger spiral some 10 billion years ago.

NGC 1055 and M77 form a binary galactic system. They are the largest galaxies of a small galactic cluster that included 6 other galaxies. I read on Wikipedia that they are approximately 442,000 light years apart, but this must only the distance that they appear apart in an image, since NGC 1055 is about 7 Million light years farther from Earth than M77.

subs:
L 86 x 120s
R 15 x 300s
G 13 x 300s
B 10 x 300s

Total integration time: 6 hr

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M77 and NGC1055

M77 and NGC1055

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M77 and NGC1055

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