an international team of astronomers that includes texas a&m universitys benjamin boizelle and jonelle walsh has obtained the clearest view to date of cold gas rotation around a supermassive black hole using the national radio astronomy observatorys atacama large millimeter/submillimeter array (alma) a huge highly sophisticated radio telescope array situated at an altitude of 16 500 feet in the high desert of chile the team zeroed in on a cosmic behemoth at the center of the giant elliptical galaxy ngc 3258 located about 100 million light-years from earth they then calculated the mass of this supermassive black hole the largest ever measured with alma to be a whopping 225 billion times the mass of our sun observing the orbital motion of material as close as possible to a black hole is vitally important when accurately determining the black holes mass said boizelle a postdoctoral researcher in texas a&ms george p and cynthia woods mitchell institute for fundamental physics and astronomy and lead author on the teams study published wednesday (aug 7) in the astrophysical journal and also available via arxiv these new observations of ngc 3258 demonstrate almas amazing power to map the rotation of cold gaseous disks around supermassive black holes in stunning detail according to the official press release alma has pioneered a new method to study black holes in giant elliptical galaxies during the past few years about 10 percent of elliptical galaxies contain regularly rotating disks of cold dense gas at their centers by measuring the doppler shift of emission from molecules like carbon monoxide (co) with millimeter-wavelength radio telescopes astronomers can trace the motion of orbiting gas clouds given the nature of its configuration and capabilities alma is uniquely suited to resolve rapidly rotating gas at the centers of galaxies alma has made the most precise measurements of cold gas swirling around a supermassive black hole the cosmic behemoth at the center of the giant elliptical galaxy ngc 3258 the multi-color ellipse reflects the motion of the gas orbiting the black hole with blue indicating motion toward us and red motion away from us the inset box represents how the orbital velocity changes with distance from the black hole (credit: alma (eso/naoj/nrao) b boizelle; nrao/aui/nsf s dagnello; hubble space telescope (nasa/esa); carnegie-irvine galaxy survey) images taken by nasas hubble space telescope reveal a dusty disk at the center of ngc 3258 that is nearly 1 000 light-years across making this galaxy a promising target for alma observations as a part of his phd dissertation at the university of california irvine boizelle obtained alma co observations of ngc 3258 in august 2017 that showed the gas is in nearly perfect rotation from the outer edge of the disk down to just 65 light-years from the supermassive black hole by carefully modeling the gas rotation speed he was able to measure the black holes mass with unprecedented precision previous studies have demonstrated almas ability to detect rotating gas disks near a black hole and even to measure black hole masses in a few cases boizelle said for the first time however these observations highly resolve cold gas rotation within what is called the sphere of influence the innermost region of the galaxy where a black holes gravity is the dominant force dr benjamin boizelle dr jonelle walsh while alma observations have traced out cold gas rotation in dusty disks at the centers of other massive galaxies boizelle notes they do not frequently reveal rapid gas rotation within the sphere of influence he describes ngc 3258 as an extraordinarily uncommon case and says that finding more examples like this one will help astronomers better understand the growth of black holes and galaxies over cosmic time the teams paper a precision measurement of the mass of the black hole in ngc 3258 from high-resolution alma observations of its circumnuclear disk can be viewed online along with related figures and captions and also via arxiv for additional information about boizelle walsh and astronomy at texas a&m visit http://mitchelltamuedu/research/astronomy/ this story contains excerpts from a national radio astronomy observatory brief authored by public information officers charles blue and suzy gurton # # # # # # # # # # about research at texas a&m university: as one of the worlds leading research institutions texas a&m is at the forefront in making significant contributions to scholarship and discovery including that of science and technology research conducted at texas a&m represented annual expenditures of more than $922 million in fiscal year 2018 texas a&m ranked in the top 20 of the national science foundations higher education research and development survey (2017) based on expenditures of more than $9054 million in fiscal year 2017 texas a&ms research creates new knowledge that provides basic fundamental and applied contributions resulting in many cases in economic benefits to the state nation and world to learn more visit http://researchtamuedu/ -atm- contact: shana k hutchins (979) 862-1237 or shutchins@sciencetamuedu or dr benjamin boizelle (979) 845-7778 or bboizelle@emailtamuedu the post astronomers capture orbital motion around a black hole with unprecedented clarity appeared first on college of science share: