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The galaxy's name stems from the area of Earth's sky in which it appears, the constellation of Andromeda, which itself is named after the princess who was the wife of Perseus in Greek mythology. [8] The virial mass of the Andromeda Galaxy is of the same order of magnitude as that of the Milky Way, at 1 trillion solar masses (2.0 × 10 42 ...
Sagittarius A*, abbreviated as Sgr A* (/ ˈ s æ dʒ ˈ eɪ s t ɑːr / SADGE-AY-star [3]), is the supermassive black hole [4] [5] [6] at the Galactic Center of the Milky Way.Viewed from Earth, it is located near the border of the constellations Sagittarius and Scorpius, about 5.6° south of the ecliptic, [7] visually close to the Butterfly Cluster (M6) and Lambda Scorpii.
Some of the most notable galaxies with supermassive black hole candidates include the Andromeda Galaxy, M32, M87, NGC 3115, NGC 3377, NGC 4258, NGC 4889, NGC 1277, OJ 287, APM 08279+5255 and the Sombrero Galaxy. [194] It is now widely accepted that the centre of nearly every galaxy, not just active ones, contains a supermassive black hole. [195]
Black holes have no consistent naming conventions. Supermassive black holes receive the designation of the galaxy whose core they reside in. Examples are NGC 4261, NGC 4151 and M31, which derive their designation from the New General Catalogue and the list of Messier objects.
OJ 287 core black holes — a BL Lac object with a candidate binary supermassive black hole core system [23] PG 1302-102 – the first binary-cored quasar — a pair of supermassive black holes at the core of this quasar [24] [25] SDSS J120136.02+300305.5 core black holes — a pair of supermassive black holes at the centre of this galaxy [26]
At the center of the Milky Way galaxy resides a supermassive black hole four million times the mass of our sun called Sagittarius A* that some scientists have called a gentle giant because of its ...
List of most massive black holes Host or black hole name Mass (M ☉) Notes (Maximal Theoretical Limit) 2.7 × 10 11: This is the maximum mass of a black hole that models predict, at least for luminous accreting SMBHs. At around 10 10 M ☉, effects of both intense radiation and star formation in the accretion disc slow down black hole growth.
The Black Hole at the Center of the Milky Way. London: Imperial College Press. ISBN 978-1-86094-567-0. Melia, Fulvio (2003). The Black Hole in the Center of Our Galaxy. Princeton: Princeton University Press. ISBN 978-0-691-09505-9. Melia, Fulvio (2007). The Galactic Supermassive Black Hole. Princeton: Princeton University Press. ISBN 978-0-691 ...