A research team has published a new study lead by Pat Roche, professor of astrophysics at The University of Oxford, and Chris Packham, associate professor of physics and astronomy at The University of Texas at San Antonio. It reveals a new high resolution map of the magnetic field lines in gas and dust swirling around the supermassive black hole at the center of our galaxy. The team created the map, which is the first of its kind, using the CanariCam infrared camera attached to the Gran Telescopio Canarias on the island of La Palma.
"This collaborative work is an exciting step forward in our collective efforts to gain a greater understanding of our own galaxy and the super-massive black hole at the center of it. It also demonstrates the importance of access to the largest telescopes using advanced cameras/techniques," Packham said.
Black holes are objects with gravitational fields so strong that even light cannot escape their grasp. The center of almost every galaxy appears to host a black hole, including the Milky Way, where we live. Stars move around the black hole at speeds of up to 800 million kilometres an hour, indicating that it has a mass of at least a million times our Sun. Depending on how the material flows, some of it may eventually be captured and engulfed by the black hole.
Visible light from sources in the center of the Milky Way is blocked by clouds of gas and dust. Infrared light, as well as X-rays and radio, more freely passes through this obscuring material, so astronomers use this to see the region more clearly. CanariCam combines this with a polarising device, which preferentially filters light with the particular characteristics associated with magnetic fields.
"This work, in addition to its scientific relevance, is very important to the advancement of the Ph.D. physics and astronomy program here at UTSA, since it involves students in cutting edge research," said Miguel Jose Yacaman, professor and Lutcher Brown Endowed Chair of the UTSA Department of Physics and Astronomy.
Centered on the supermassive black hole, the new infrared map covers a region about one light year on each side. The image shows the intensity of infrared light, and traces magnetic field lines within filaments of warm dust grains and hot gas, which appear here as thin lines reminiscent of brush strokes in a painting.
The filaments, several light years long, appear to meet close to the black hole and may indicate where orbits of streams of gas and dust converge. One prominent feature links some of the brightest stars in the center of the galaxy. Despite the strong winds flowing from these stars, the filaments remain in place, bound by the magnetic field within them. Elsewhere the magnetic field is less clearly aligned with the filaments.
The new observations give astronomers more detailed information on the relationship between the bright stars and the dusty filaments. The origin of the magnetic field in this region is not understood, but it is likely that a smaller magnetic field is stretched out as the filaments are elongated by the gravitational influence of the black hole and stars in the galactic center.
"Big telescopes like GTC, and instruments like CanariCam, deliver real results," Roche said. "We're now able to watch material race around a black hole 25,000 light years away, and for the first time see magnetic fields there in detail."
Joanna Carver | EurekAlert!
Physicists trap light in nanoresonators for record time
23.01.2020 | ITMO University
Colloidal Quantum Dot Photodetectors can now see further than before
21.01.2020 | ICFO-The Institute of Photonic Sciences
Researchers from Dresden and Osaka present the first fully integrated flexible electronics made of magnetic sensors and organic circuits which opens the path towards the development of electronic skin.
Human skin is a fascinating and multifunctional organ with unique properties originating from its flexible and compliant nature. It allows for interfacing with...
Researchers of the Carl Gustav Carus University Hospital Dresden at the National Center for Tumor Diseases Dresden (NCT/UCC), together with an international...
A Duke University research team has identified a new function of a gene called huntingtin, a mutation of which underlies the progressive neurodegenerative...
For years, a new synthesis method has been developed at TU Wien (Vienna) to unlock the secrets of "strange metals". Now a breakthrough has been achieved. The results have been published in "Science".
Superconductors allow electrical current to flow without any resistance - but only below a certain critical temperature. Many materials have to be cooled down...
KIT researchers develop novel composites of DNA, silica particles, and carbon nanotubes -- Properties can be tailored to various applications
Using DNA, smallest silica particles, and carbon nanotubes, researchers of Karlsruhe Institute of Technology (KIT) developed novel programmable materials....
16.01.2020 | Event News
15.01.2020 | Event News
07.01.2020 | Event News
23.01.2020 | Physics and Astronomy
23.01.2020 | Information Technology
23.01.2020 | Trade Fair News