In this article, we will delve into the fascinating world of Galaxy X (galaxy), exploring its multiple facets and meanings. _Var1 has been the object of interest and debate throughout history, awakening the curiosity and study of experts in various disciplines. From its impact on contemporary society to its ancestral origins, Galaxy X (galaxy) has become a topic of unquestionable relevance. Through a detailed analysis, we will analyze the different perspectives that exist around Galaxy X (galaxy), seeking to shed light on its true meaning and its influence in today's world.
Galaxy X[1][2] is a postulated dark satellite dwarf galaxy of the Milky Way Galaxy. If it exists, it would be composed mostly of dark matter and interstellar gas with few stars.[1][3] Its proposed location is some 90 kpc (290 kly) from the Sun,[1][3][4] behind the disk of the Milky Way,[1] and some 12 kpc (39 kly) in extent.[4] Galactic coordinates would be (l= -27.4°,b=-1.08°).[4]
Observational evidence for this galaxy was presented in 2015,[5] based on the claimed discovery of four Cepheid variable stars by Sukanya Chakrabarti (RIT) and collaborators.[4] Search for the stars was motivated by an earlier study [6] that linked a warp in the HI (atomic hydrogen) disk of the Milky Way Galaxy to the tidal effects of a perturbing galaxy.[3][7] The unseen perturber's mass was calculated to be about 1%[NB 1] of that of the Milky Way,[8] which would make it the third heaviest satellite of the Milky Way, after the Magellanic Clouds (Large Magellanic Cloud and Small Magellanic Cloud, each some 10x larger than Galaxy X).[1] In this hypothetical model, the putative satellite galaxy would have interacted with the Milky Way some 600 million years ago, coming as close as 5–10 kpc (16–33 kly), and would now be moving away from the Milky Way.[4][7][8]
The name "Galaxy X" was coined in 2011 in analogy to Planet X.[2] [9]
In November 2015, a group led by P. Pietrukowicz published a paper arguing against the existence of Galaxy X. These authors argued that the four stars were not actually Cepheid variable stars and that their distances might be very different than claimed in the discovery paper of Chakrabarti et al. On this basis, the authors stated that "there is no evidence for a background dwarf galaxy".[10] However the galaxy is still regarded to exist by others, with the stars being examined to be actual Cepheids.[11]
List of claimed components of Galaxy X
| Component | Type | Notes | |
|---|---|---|---|
| VVV J162559.36-522234.0 | Cepheid variable | about 100 million years old | [4] |
| VVV J162328.18-513230.4 | Cepheid | about 100 million years old | [4] |
| VVV J162119.39-520233.3 | Cepheid | about 100 million years old | [4] |
| VVV J161542.47-494439.0 | Cepheid | about 100 million years old | [4] |