Laevens 1 ( Bowl globular cluster, PSO J174.0675-10.8774 ) is a weak globular star cluster in the constellation Bowl , discovered in 2014.
| Laevens 1 | |
|---|---|
| Star cluster | |
 | |
| Research history | |
| opening date | 2014 |
| Designations | Bowl , PSO J174.0675-10.8774 |
| Observational data ( Age J2000.0 ) | |
| Type of | ball |
| Right ascension | |
| Declination | |
| Distance | 145 pda |
| Visible magnitude (V) | 14.2 |
| Visible Dimensions (V) | 0.46 ' |
| Constellation | Bowl |
Located at a distance of 145 kpc , it is one of the most distant globular clusters of our Galaxy [1] . Located within the halo of the Galaxy. The age of the cluster is estimated at 7.5 billion years. Probably, the cluster appeared in our Galaxy a long time after its formation, possibly as a result of interaction with the Small Magellanic Cloud [2] [3] [4] .
Initially, according to the results of a number of analyzes of the stellar population, this object was assigned to the satellite galaxies of the Milky Way, since the presence of blue stars and a poorly populated region of red condensation indicates recent (within 400 million years) star formation, which is not typical for globular clusters [5] . Recent studies have suggested the erroneous assignment of such objects to a cluster. Repeated analysis, not taking into account these objects, showed that Laevens 1 is a weak globular cluster of intermediate age. [6]
Laevens 1 orbits the galaxy at about the same distance as the ultra-weak dwarf galaxies Leo IV and Leo V. Perhaps all these objects were closely connected with each other before being within the halo of the Milky Way. [5]
Notes
- ↑ 1 2 3 Laevens, Benjamin PM; Nicolas F. Martin, Branimir Sesar, Edouard J. Bernard et al. A New Distant Milky Way Globular Cluster in the Pan-STARRS1 3pi Survey // The Astrophysical Journal : journal. - IOP Publishing , 2014 .-- 1 May ( vol. 786 ). - P. L3 . - ISSN 0004-637X . - DOI : 10.1088 / 2041-8205 / 786/1 / L3 .
- ↑ Weisz, Daniel R .; Koposov, Sergey E .; Dolphin, Andrew E .; Belokurov, Vasily; Gieles, Mark; Mateo, Mario L .; Olszewski, Edward W .; Sills, Alison; Walker, Matthew G. A Hubble Space Telescope Study of the Enigmatic Milky Way Halo Globular Cluster Crater ( journal ) : journal. - 2015. - October 28. - arXiv : 1510.08533 .
- ↑ Thieving Milky Way stole distant star cluster from neighbor , New Scientist (November 19, 2015). Date of treatment January 26, 2016.
- ↑ Kirby, Evan N .; Simon, Joshua D .; Cohen, Judith G. Spectroscopic Confirmation of the Dwarf Galaxies Hydra II and Pisces II and the Globular Cluster Laevens 1 (Eng.) // The Astrophysical Journal : journal. - IOP Publishing 2015 .-- 1 January ( vol. 810 , no. 1 ). - P. 56 . - ISSN 0004-637X . - DOI : 10.1088 / 0004-637X / 810/1/56 . - arXiv : 1506.01021 .
- ↑ 1 2 Belokurov, V .; MJ Irwin, SE Koposov, NW Evans, E. Gonzalez-Solares, N. Metcalfe, T. Shanks. ATLAS lifts the Cup: discovery of a new Milky Way satellite in Crater // Monthly Notices of the Royal Astronomical Society : journal. - Oxford University Press , 2014 .-- 1 July ( vol. 441 , no. 3 ). - P. 2124-2133 . - ISSN 0035-8711 . - DOI : 10.1093 / mnras / stu626 . - . - arXiv : 1403.3406 .
- ↑ Voggel, Karina; Hilker, Michael; Baumgardt, Holger; Collins, Michelle LM; Grebel, Eva K .; Husemann, Bernd; Richtler, Tom & Frank, Matthias J., "Probing the boundary between star clusters and dwarf galaxies: A MUSE view on the dynamics of Crater / Laevens I", arΧiv : 1604.06806 [astro-ph]