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The Starving Ellipticals of Fossil Groups
(Turun yliopisto, 2018-09-05)
Fossil Groups (FGs) are unique galaxy systems with extensive X-ray halos and large magnitude gaps between members. It has been theorized that they are old and dynamically relaxed systems formed by multiple galaxy mergers. ...
Late-time near-infrared evolution of the ejecta and the equatorial ring of Supernova 1987A
(Turun yliopisto, 2018-05-23)
Supernova 1987A, located 50 kpc away in the Large Magellanic Cloud, is the closest supernova (SN) observed in the time of modern astronomy. The circumstellar medium of SN 1987A is characterised by a system of three rings ...