Analysing all Galaxy And Mass Assembly (GAMA) galaxies within a factor of 2 (±0.3 dex) of the stellar mass of the Milky Way (MW), there is a 11.9 per cent chance that one of these galaxies will have a close companion (within a projected separation of 70 kpc and radial separation of 400 km s−1) that is at least as massive as the Large Magellanic Cloud (LMC). Two close companions at least as massive as the Small Magellanic Cloud (SMC) are rare at the 3.4 per cent level. Two full analogues to the MW–LMC–SMC system were found in GAMA (all galaxies late-type and star-forming), suggesting that such a combination of close together, late-type, star-forming galaxies is rare: only 0.4 per cent of MW mass galaxies (in the range where we could observe both the LMC and SMC) have such a system. In summary, the MW–LMC–SMC system is a 2.7σ event (when recast into Gaussian statistics).
Using cross-correlation comparisons we find that there is a preference for SMC–LMC binary pair analogues to be located within 2 Mpc of a range of different luminosity groups. There is a particular preference for such binaries to be located near Local Group luminosity systems. When these groups are subdivided into small magnitude gap and large magnitude gap subsets, the binaries prefer to be spatially associated with the small magnitude gap systems. These systems will be dynamically less evolved, but still offer the same amount of gravitational dark matter. This suggests that binaries such as the SMC–LMC might be transient systems, usually destroyed during vigorous merger events. Details of a particularly striking analogue to the MW–SMC–LMC and M31 complex are included.
Summary: The Milky Way galaxy is a typical galaxy, but finding an identical one is difficult. In fact it is a rare. But scientists have found a few others, most significantly GAMA202627 (pictured above). But scientists say we should enjoy it while we can since it only has a "short" lifespan, only a few billion years.
What is the significance of this discovery? 1. Possibility of similar planetary system 2. Clue on the formation of stars and galaxies. 3. Clue on the origin of the universe
Last edit: 2012-08-24 00:26:49
PassiveAce United States. August 24 2012 00:28. Posts 4683
also is there any significance to having two satellite galaxies? I mean, it's rare and kinda interesting, but did they affect planet formation or something? otherwise I don't really get what the big deal is.
Last edit: 2012-08-24 00:39:03
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ZeroCartin Costa Rica. August 24 2012 00:31. Posts 2151
On August 24 2012 00:26 VY Canis Majoris wrote: there is a 11.9 per cent chance that one of these galaxies will have a close companion
:/ Isn't that a very low chance of it being there then?
Not at all, in astronomy anything above a 0.1% is considered rather high lol, 11.9% chance is extremely high probability.
I think that chance is just for there being a similar age, similar mass, similar type Galaxy as ours. Having the other small galaxies/clouds around it is what makes it rare if I understood the OP correctly.
On August 07 2012 12:43 Coagulation wrote: that crumb tray looks optimal
Pandemona England. August 24 2012 00:39. Posts 10408
Pretty cool, much better than the candy scandal i came in expecting. Science ftw!
Sounds like your relationships suck, although probably not literally.- kwark Best part of waking up, KwarK banning rape apologists in my cup! I guess you could say... *puts on sunglasses* ... they were asking for it. colaboy and Kasaraki