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17 September 2014
Big surprises can come in small packages
Artist’s concept of supermassive black hole within M60-UCD1
Astronomers using the NASA/ESA Hubble Space Telescope have found a monster lurking in a very unlikely place. New observations of the ultracompact dwarf galaxy M60-UCD1 have revealed a supermassive black hole at its heart, making this tiny galaxy the smallest ever found to host a supermassive black hole. This suggests that there may be many more supermassive black holes that we have missed, and tells us more about the formation of these incredibly dense galaxies. The results will be published in the journal Nature on 18 September 2014.
Hubble image of Messier 60 and M60-UCD1
Lying about 50 million light-years away, M60-UCD1 is a tiny galaxy with a diameter of 300 light-years — just 1/500th of the diameter of the Milky Way. Despite its size it is pretty crowded, containing some 140 million stars. While this is characteristic of an ultracompact dwarf galaxy (UCD) like M60-UCD1, this particular UCD happens to be the densest ever seen [1].
Ultracompact dwarf galaxy M60-UCD1 as viewed by Hubble
Despite their huge numbers of stars, UCDs always seem to be heavier than they should be. Now, an international team of astronomers has made a new discovery that may explain why — at the heart of M60-UCD1 lurks a supermassive black hole [2] with the mass of 20 million Suns.
Hubble image of galaxy pair Arp 116
"We've known for some time that many UCDs are a bit overweight. They just appear to be too heavy for the luminosity of their stars," says co-author Steffen Mieske of the European Southern Observatory in Chile. "We had already published a study that suggested this additional weight could come from the presence of supermassive black holes, but it was only a theory. Now, by studying the movement of the stars within M60-UCD1, we have detected the effects of such a black hole at its centre. This is a very exciting result and we want to know how many more UCDs may harbour such extremely massive objects."
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Hubble image of Arp 116 (annotated)
The supermassive black hole at the centre of M60-UCD1 makes up a huge 15 percent of the galaxy's total mass, and weighs five times that of the black hole at the centre of the Milky Way. "That is pretty amazing, given that the Milky Way is 500 times larger and more than 1000 times heavier than M60-UCD1," explains Anil Seth of the University of Utah, USA, lead author of the international study. "In fact, even though the black hole at the centre of our Milky Way galaxy has the mass of 4 million Suns it is still less than 0.01 percent of the Milky Way's total mass, which makes you realise how significant M60-UCD1's black hole really is."
Ground-based image of Arp 116 and its surroundings
The team discovered the supermassive black hole by observing M60-UCD1 with both the NASA/ESA Hubble Space Telescope and the Gemini North 8-metre optical and infrared telescope on Hawaii's Mauna Kea, USA. The sharp Hubble images provided information about the galaxy's diameter and stellar density, whilst Gemini was used to measure the movement of stars in the galaxy as they were affected by the black hole's gravitational pull. These data were then used to calculate the mass of the unseen black hole.
Video simulation showing artist’s impression of dwarf galaxy M60-UCD1's formation
The finding implies that there may be a substantial population of previously unnoticed black holes. In fact, the astronomers predict there may be as many as double the known number of black holes in the local Universe.
Additionally, the results could affect theories of how such UCDs form. "This finding suggests that dwarf galaxies may actually be the stripped remnants of larger galaxies that were torn apart during collisions with other galaxies, rather than small islands of stars born in isolation," explains Seth. "We don't know of any other way you could make a black hole so big in an object this small."
Zoom into galaxy pair Arp 116
One explanation is that M60-UCD1 was once a large galaxy containing 10 billion stars, and a supermassive black hole to match. "This galaxy may have passed too close to the centre of its much larger neighbouring galaxy, Messier 60," explains co author Remco van den Bosch of the Max Planck Institute for Astronomy in Heidelberg, Germany. "In that process the outer part of the galaxy would have been torn away to become part of Messier 60, leaving behind only the small and compact galaxy we see today."
Pan across galaxy pair Arp 116
The team believes that M60-UDC1 may one day merge with Messier 60 to form a single galaxy. Messier 60 also has its own monster black hole an amazing 4.5 billion times the size of our Sun and more than 1000 times bigger than the black hole in our Milky Way. A merger between the two galaxies would also cause the black holes to merge, creating an even more monstrous black hole.
Notes:
[1] In fact, if you lived inside this galaxy the night sky would dazzle with the light of at least a million stars, all visible to the naked eye. On Earth, a comparatively measly 4000 stars are visible.
[2] Black holes are ultracompact objects with a gravitational pull so strong that even light cannot escape. Supermassive black holes — those with the mass of at least 1 million stars like our Sun — are thought to be at the centres of many galaxies.
Notes for editors:
The Hubble Space Telescope is a project of international cooperation between ESA and NASA.
The international team of astronomers in this study consists of A.C. Seth (University of Utah, USA); R. van den Bosch (Max Planck Institute for Astronomy, Heidelberg, Germany); S. Mieske (European Southern Observatory, Chile); H. Baumgardt (University of Queensland, Australia); M. den Brok (University of Utah, USA); J. Strader (Michigan State University, USA); N. Neumayer (European Southern Observatory, Germany); I. Chilingarian (Smithsonian Astrophysical Observatory, USA; Moscow State University, Russia); M. Hilker (European Southern Observatory, Germany); R. McDermid (Australian Astronomical Observatory, Australia; Macquarie University, Australia); L. Spitler (Australian Astronomical Observatory, Australia; Macquarie University, Australia); J. Brodie (University of California, USA); M. J. Frank (Heidelberg University, Germany); J. L. Walsh (The University of Texas at Austin, USA).
Links:
Images of Hubble: http://www.spacetelescope.org/images/archive/category/spacecraft/
NASA press release: http://hubblesite.org/newscenter/archive/releases/2014/41
Science paper in Nature: http://dx.doi.org/10.1038/nature13762
Images, Text, Credits: NASA/ESA/D. Coe/G. Bacon (STScI)/A. Seth (University of Utah, USA)/Hubble Heritage(STScI/AURA)/Digitized Sky Survey 2 (Acknowledgement: Davide De Martin)/Videos: NASA/ESA/H. Baumgardt (University of Queensland)/A. Fujii, Digitized Sky Survey 2. Music: R. Vreeland (disasterpeace.com).
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