UTSA-led team finds black hole affecting galactic climate
(Jan. 5, 2016) -- A team of researchers led by Eric Schlegel, Vaughan Family Endowed Professor in Physics at The University of Texas at San Antonio (UTSA), has discovered a powerful galactic blast produced by a giant black hole about 26 million light years from Earth. The black hole is the nearest supermassive black hole to Earth that is currently undergoing such violent outbursts.
Schlegel’s team used NASA’s Earth-orbiting Chandra X-ray Observatory to find the black hole blast in the famous Messier 51 system of galaxies. The system contains a large spiral galaxy, NGC 5194, colliding with a smaller companion galaxy, NGC 5195.
“Just as powerful storms here on Earth impact their environments, so too do the ones we see out in space,” Schlegel said. “This black hole is blasting hot gas and particles into its surroundings that must play an important role in the evolution of the galaxy.”
Schlegel and his colleagues, including Fisk University graduate student and UTSA alumna Laura Vega ’14, detected two X-ray emission arcs close to the center of NGC 5195, where the supermassive black hole is located.
“We think these arcs represent artifacts from two enormous gusts when the black hole expelled material outward into the galaxy,” said co-author Christine Jones, astrophysicist and lecturer at the Harvard-Smithsonian Center for Astrophysics (CfA). “We think this activity has had a big effect on the galactic landscape.”
Just beyond the outer arc, the researchers detected a slender region of hydrogen gas emission, suggesting that X-ray emitting gas displaced the hydrogen gas from the center of the galaxy.
Moreover, the properties of the gas around the arcs suggest that the outer arc has swept up enough material to trigger the formation of new stars. This type of phenomenon, where a black hole affects its host galaxy, is called “feedback.”
“We think that feedback keeps galaxies from becoming too large,” said co-author Marie Machacek, astrophysicist at CfA. “But at the same time, it can be responsible for how some stars form, showing that black holes can be creative, not just destructive.”
The astronomers believe the black hole’s outbursts may have been triggered by the interaction of NGC 5195 with its larger companion, NGC 5194, causing gas to be funneled toward the black hole. The team estimates that it took about one to three million years for the inner arc to reach its current position, and three to six million years for the outer arc.
“The black hole’s behavior may be a local example of events that commonly took place when the universe was much younger. That makes this observation potentially very important,” Schlegel said.
The researchers presented their findings today at the 227th meeting of the American Astronomical Society meeting in Kissimmee, Fla. They have also described their work in a paper submitted to The Astrophysical Journal.
NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program for NASA's Science Mission Directorate in Washington. The Smithsonian Astrophysical Observatory in Cambridge, Massachusetts, controls Chandra's science and flight operations.
Learn more about the UTSA Department of Physics and Astronomy.
Students are invited to a semi-formal, dinner banquet with an awards presentation and dancing. Keynote speaker will be San Antonio City Councilman William Cruz Shaw. Tickets must be purchased by Feb 19 at Roadrunner Express. UTSA students are $15 and guests are $20.H-E-B Student Union Ballroom (HSU 1.104/1.106), Main Campus
Dr. Don Jenkins from UT Health SA will lead this event UTSA with up to 30 certified STB trainers, and train up to 300 UTSA students and personnel in stop the bleed methods.H-E-B Student Union Ballroom (HSU 1.106), Main Campus
Get to know more about the Bexar County Criminal District Court candidates' stance on the issues before voting in the primary election on March 6.Buena Vista Street Building, Aula Canaria (BVB 1.328), Downtown Campus
As part of RecycleMania,UTSA will provide sensitive document shredding services for the UTSA community. Bring documents to the parking lot between Student Union & Ximenes Avenue Garage. Document pick up also available for the Downtown and Hemisfair Campuses.H-E-B Student Union parking lot, Main Campus
Lt. Gen. (Ret.) Koichiro Bansho will speak the importance of the Japan-U.S. relations from the historical and security perspectives. He will go over the history and future of the alliance between the two countries.H-E-B Student Union, Travis Room (HSU 2.202), Main Campus
This panel discussion includes professionals from various careers and fields talking about maintaining a black identity in professional spaces.Student Union Denman Room (SU 2.01.28), Main Campus
The Faculty Center presents geneticist, anthropologist, author & entrepreneur Spencer Wells. Join us for a talk about how our DNA informs the way our ancestors populated the planet and how research can change industry and perceptions.Student Union Retama Auditorium (SU 2.02.02), Main Campus
Come hear this geneticist, anthropologist, author and entrepreneur speak about "The Human Journey: A Genetic Odyssey." The lecture is free and open to the public.Student Union, Retama Auditorium (SU 2.02.02), Main Campus