Institute of Astrophysics and Space Sciences | University of Porto | 2018 Nov 21
They are massive, they are very small and they are extremely rare, but may hold the secrets of how galaxies form and evolve. A new study lifts the tip of the veil over the timid life of the massive ultracompact galaxies. ...
Massive ultracompact galaxies have several times more stars than our Milky Way, more than the equivalent to 80 billion suns, and thus are very bright, but their stars are densely packed within a size much smaller than our galaxy’s. The researchers identified a new set of 29 galaxies with these properties, at distances between two and five billion light-years from Earth.
Seven of these shy heavy weights are actually primordial galaxies that remained untouched by others since their formation, more than ten billion years ago. These so-called relic galaxies open windows onto how galaxies looked like and were in the early ages of the Universe, although they are in our galactic neighbourhood. ...
Galaxy and Mass Assembly (GAMA): Accurate number densities and
environments of massive ultracompact galaxies at 0.02 < z < 0.3 ~ F. Buitrago et al
- Astronomy & Astrophysics 619:A137 (Nov 2018) DOI: 10.1051/0004-6361/201833785
arXiv.org > astro-ph > arXiv:1807.0253 > 06 Jul 2018 (v1), 05 Sep 2018 (v2)