Andrew Yee[_1_]
January 8th 08, 05:54 PM
National Radio Astronomy Observatory
P.O. Box O
Socorro, NM 87801
http://www.nrao.edu
Contact:
Dave Finley, Public Information Officer
(505) 835-7302
EMBARGOED For Release: 9:30 a.m., CST, Tuesday, January 8, 2008
VLBA Movies Reveal New Details of Cosmic Jets
Astronomers have known for decades that supermassive black holes at the
cores of galaxies can shoot out jets of subatomic particles at tremendous
speeds. However, details about the physics of such jets, including how they
are generated, how the high-speed flows are shaped into jets, and how fast
the particles are moving, among many others, have remained elusive.
An international team of researchers now is making an unprecedented
long-term study of the motions of these giant jets, using the super-sharp
imaging capabilities of the National Science Foundation's Very Long Baseline
Array (VLBA). "We're making images of 200 galactic jets at regular
intervals, tracking their motions and studying their magnetic-field
properties. This is making major contributions to our understanding of such
jets," said Matthew Lister, of Purdue University.
The research team has produced time-lapse movies of 100 of the jets,
allowing measurement of the speed and direction of motion. "The results of
these VLBA observations are going into a rich and still-growing set of data
that is available to the entire astronomical research community as a tool
for understanding the many unresolved questions we have about these jets,"
Lister said.
The jet study is called MOJAVE -- Monitoring Of Jets in Active galactic
nuclei with VLBA Experiments -- and began in 2002. It is a successor to an
earlier VLBA study that regularly made images of nearly 200 jets from 1994
to 2002.
The jets are powered by the gravitational energy of black holes containing
hundreds of millions times more mass than the Sun. Black holes are
concentrations of mass so dense that not even light can escape them. As
these monsters draw material toward them, the material falls into a circular
disk orbiting the black hole. The jets are propelled outward along the poles
of the disk.
The MOJAVE movies have given astronomers some surprises and also have
spurred follow-on studies of individual objects. "Before the VLBA was built,
we were hindered in our studies of extragalactic jets by the lack of a
facility that could do high-quality, regularly-spaced images showing very
great detail. The VLBA's capabilities have made it a premier facility for
studying these objects out to very large distances, and thus getting a large
sample," Lister said.
The MOJAVE observations are showing new details about the structures of
magnetic fields in the jets. This is important, because magnetic fields are
thought to play vital roles in the acceleration of the particles and in
shaping the jets.
The time-lapse movies have revealed a variety of interesting behavior in the
jets. For example, the powerful radio galaxy called 3C279 emitted a bright
feature that moved along a straight path for 15 years, then suddenly
brightened, showed a change in its magnetic field, and sped off in a new
direction. Other jets shoot successive bright features that move outward in
curved paths. Some features in jets are seen to break apart.
"These detailed movies of complex motions are real-world data that allow
researchers to refine their computer simulations of the jets, leading to a
far better understanding of the physics involved in such impressive cosmic
particle accelerators," Lister said.
The MOJAVE data will prove valuable for comparison with the gamma-ray
information to be collected by NASA's upcoming GLAST satellite. "Using the
MOJAVE data along with data from other ground-based and orbiting
observatories at different wavelengths is bringing the studies of galactic
jets into a new era," Lister concluded.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation, operated under cooperative agreement by Associated
Universities, Inc.
Additional Information:
* MOJAVE home page
http://www.physics.purdue.edu/MOJAVE
* MOJAVE movies
http://www.physics.purdue.edu/MOJAVE/movies.html
* 3c279 Movie
http://www.nrao.edu/pr/2008/mojave2/3c279.mpg [4.6MB]
P.O. Box O
Socorro, NM 87801
http://www.nrao.edu
Contact:
Dave Finley, Public Information Officer
(505) 835-7302
EMBARGOED For Release: 9:30 a.m., CST, Tuesday, January 8, 2008
VLBA Movies Reveal New Details of Cosmic Jets
Astronomers have known for decades that supermassive black holes at the
cores of galaxies can shoot out jets of subatomic particles at tremendous
speeds. However, details about the physics of such jets, including how they
are generated, how the high-speed flows are shaped into jets, and how fast
the particles are moving, among many others, have remained elusive.
An international team of researchers now is making an unprecedented
long-term study of the motions of these giant jets, using the super-sharp
imaging capabilities of the National Science Foundation's Very Long Baseline
Array (VLBA). "We're making images of 200 galactic jets at regular
intervals, tracking their motions and studying their magnetic-field
properties. This is making major contributions to our understanding of such
jets," said Matthew Lister, of Purdue University.
The research team has produced time-lapse movies of 100 of the jets,
allowing measurement of the speed and direction of motion. "The results of
these VLBA observations are going into a rich and still-growing set of data
that is available to the entire astronomical research community as a tool
for understanding the many unresolved questions we have about these jets,"
Lister said.
The jet study is called MOJAVE -- Monitoring Of Jets in Active galactic
nuclei with VLBA Experiments -- and began in 2002. It is a successor to an
earlier VLBA study that regularly made images of nearly 200 jets from 1994
to 2002.
The jets are powered by the gravitational energy of black holes containing
hundreds of millions times more mass than the Sun. Black holes are
concentrations of mass so dense that not even light can escape them. As
these monsters draw material toward them, the material falls into a circular
disk orbiting the black hole. The jets are propelled outward along the poles
of the disk.
The MOJAVE movies have given astronomers some surprises and also have
spurred follow-on studies of individual objects. "Before the VLBA was built,
we were hindered in our studies of extragalactic jets by the lack of a
facility that could do high-quality, regularly-spaced images showing very
great detail. The VLBA's capabilities have made it a premier facility for
studying these objects out to very large distances, and thus getting a large
sample," Lister said.
The MOJAVE observations are showing new details about the structures of
magnetic fields in the jets. This is important, because magnetic fields are
thought to play vital roles in the acceleration of the particles and in
shaping the jets.
The time-lapse movies have revealed a variety of interesting behavior in the
jets. For example, the powerful radio galaxy called 3C279 emitted a bright
feature that moved along a straight path for 15 years, then suddenly
brightened, showed a change in its magnetic field, and sped off in a new
direction. Other jets shoot successive bright features that move outward in
curved paths. Some features in jets are seen to break apart.
"These detailed movies of complex motions are real-world data that allow
researchers to refine their computer simulations of the jets, leading to a
far better understanding of the physics involved in such impressive cosmic
particle accelerators," Lister said.
The MOJAVE data will prove valuable for comparison with the gamma-ray
information to be collected by NASA's upcoming GLAST satellite. "Using the
MOJAVE data along with data from other ground-based and orbiting
observatories at different wavelengths is bringing the studies of galactic
jets into a new era," Lister concluded.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation, operated under cooperative agreement by Associated
Universities, Inc.
Additional Information:
* MOJAVE home page
http://www.physics.purdue.edu/MOJAVE
* MOJAVE movies
http://www.physics.purdue.edu/MOJAVE/movies.html
* 3c279 Movie
http://www.nrao.edu/pr/2008/mojave2/3c279.mpg [4.6MB]