APOD: The Edge of Space (2021 Jul 24)

Comments and questions about the APOD on the main view screen.
User avatar
Posts: 1030
Joined: Fri Oct 16, 2020 10:25 pm

Re: APOD: The Edge of Space (2021 Jul 24)

Post by VictorBorun » Mon Aug 02, 2021 7:22 pm

neufer wrote: Sat Jul 31, 2021 1:26 am
https://en.wikipedia.org/wiki/IC_342/Maffei_Group wrote: <<The IC 342/Maffei Group (also known as the IC 342 Group or the Maffei 1 Group) is the nearest group of galaxies to the Local Group. The group can be described as a binary group; the member galaxies are mostly concentrated around either IC 342 or Maffei 1, both of which are the brightest galaxies within the group. The group is part of the Virgo Supercluster. As seen from Earth, the group lies near the plane of the Milky Way (a region sometimes called the Zone of Avoidance). Consequently, the light from many of the galaxies is severely affected by dust obscuration within the Milky Way. This complicates observational studies of the group, as uncertainties in the dust obscuration also affect measurements of the galaxies' luminosities and distances as well as other related quantities

Since the IC 342/Maffei Group and the Local Group are located physically close to each other, the two groups may have influenced each other's evolution during the early stages of galaxy formation. An analysis of the velocities and distances to the IC 342/Maffei Group as measured by M. J. Valtonen and collaborators suggested that IC 342 and Maffei 1 were moving faster than what could be accounted for in the expansion of the universe. They therefore suggested that IC 342 and Maffei 1 were ejected from the Local Group after a violent gravitational interaction with the Andromeda Galaxy during the early stages of the formation of the two groups.

However, this interpretation is dependent on the distances measured to the galaxies in the group, which in turn is dependent on accurately measuring the degree to which interstellar dust in the Milky Way obscures the group. More recent observations have demonstrated that the dust obscuration may have been previously overestimated, so the distances may have been underestimated. If these new distance measurements are correct, then the galaxies in the IC 342/Maffei Group appear to be moving at the rate expected from the expansion of the universe, and the scenario of a collision between the IC 342/Maffei Group and the Local Group would be implausible.>>
Too bad. I was wrong. Maffei I is not on the line of the spin of Milky Way disk.
Here are the objects on simbad&cds infrared sky
You do not have the required permissions to view the files attached to this post.