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A 3.5 million Solar masses black hole in the centre of the ultracompact dwarf galaxy fornax UCD3статья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 16 января 2019 г.
- Авторы: Afanasiev Anton V., Chilingarian Igor V., Mieske Steffen, Voggel Karina T., Picotti Arianna, Hilker Michael, Seth Anil, Neumayer Nadine, Frank Matthias, Romanowsky Aaron J., Hau George, Baumgardt Holger, Ahn Christopher, Strader Jay, den Brok Mark, McDermid Richard, Spitler Lee, Brodie Jean, Walsh Jonelle L.
- Журнал: Monthly Notices of the Royal Astronomical Society
- Том: 477
- Номер: 4
- Год издания: 2018
- Издательство: Oxford Journals, Oxford University Press
- Местоположение издательства: Oxford, UK, England
- Первая страница: 4856
- Последняя страница: 4865
- DOI: 10.1093/mnras/sty913
- Аннотация: The origin of ultracompact dwarfs (UCDs), a class of compact stellar systems discovered two decades ago, still remains a matter of debate. Recent discoveries of central supermassive black holes in UCDs likely inherited from their massive progenitor galaxies provide support for the tidal stripping hypothesis. At the same time, on statistical grounds, some massive UCDs might be representatives of the high luminosity tail of the globular cluster luminosity function. Here we present a detection of a3.3+1.4−1.2×10^6M⊙ black hole (1σ uncertainty) in the centre of the UCD3 galaxy in the Fornax cluster, which corresponds to 4 per cent of its stellar mass. We performed isotropic Jeans dynamical modelling of UCD3 using internal kinematics derived from adaptive optics-assisted observations with the SINFONI spectrograph and seeing limited data collected with the FLAMES spectrograph at the ESO VLT. We rule out the zero black hole mass at the 3σ confidence level when adopting a mass-to-light ratio inferred from stellar populations. This is the fourth supermassive black hole found in a UCD and the first one in the Fornax cluster. Similarly to other known UCDs that harbour black holes, UCD3 hosts metal rich stars enhanced in α-elements that support the tidal stripping of a massive progenitor as its likely formation scenario. We estimate that up to 80 per cent of luminous UCDs in galaxy clusters host central black holes. This fraction should be lower for UCDs in groups, because their progenitors are more likely to be dwarf galaxies, which do not usually host black holes massive enough to be detected.
- Добавил в систему: Чилингарян Игорь Владимирович