Press Release

VLBA Movie Gives Scientists New Insights On Workings of Mysterious Microquasars

By SpaceRef Editor
January 6, 2004
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VLBA Movie Gives Scientists New Insights On Workings of Mysterious Microquasars
ss433

Astronomers have made a 42-day movie showing unprecedented detail of the inner
workings of a strange star system that has puzzled scientists for more than two
decades. Their work is providing new insights that are changing scientists’
understanding of the enigmatic stellar pairs known as microquasars.

"This once-a-day series of exquisitely-detailed images is the best look anyone
has ever had at a microquasar, and already has made us change our thinking about
how these things work," said Amy Mioduszewski, of the National Radio Astronomy
Observatory (NRAO), in Socorro, New Mexico.

The astronomers used the National Science Foundation’s Very Long Baseline Array
(VLBA), a system of radio telescopes stretching from Hawaii to the Caribbean, to
follow daily changes in a binary-star system called SS 433, some 15,000
light-years from Earth in the constellation Aquila. Mioduszewski worked with
Michael Rupen, Greg Taylor and Craig Walker, all of NRAO. They reported their
findings to the American Astronomical Society’s meeting in Atlanta, Georgia.

SS 433 consists of a neutron star or black hole orbited by a "normal" companion
star. The powerful gravity of the neutron star or black hole is drawing material
from the stellar wind of its companion into an accretion disk of material
tightly circling the dense, central object prior to being pulled onto that
object. This disk propels jets of subatomic particles outward from its poles. In
SS 433, the particles in the jets move at 26 percent of the speed of light; in
other microquasars, the jet material moves at 90-95 percent of light speed. The
disk in SS 433 wobbles like a child’s top, causing its jets to move in a circle
every 164 days.

By imaging SS 433 daily, the astronomers were able to trace individual ejections
of material in these jets as they moved outward from the center. In addition,
they could track the jets’ precession, the movement caused by the disk’s wobble.

In other microquasars, blobs of material shot from the core become fainter, as
seen with radio telescopes, as they move outward. However, in SS 433, blobs
routinely brighten at specific distances from the core. From earlier studies,
researchers had concluded that such brightening always occurs at one specific
distance. The VLBA movie shows, instead, that there are multiple brightening
regions and not all blobs brighten at all the regions.

"We think the ejected material brightens because it’s slamming into something,"
Rupen said. "However, whatever it’s hitting has to be replenished somehow so
that the brightening can occur again when the jet sweeps through that area the
next time," he added.

"It also appears that it isn’t always replenished, because the brightening
doesn’t always happen," Mioduszewski pointed out.

The VLBA movie revealed vital new information about another part of SS 433 —
material moving outward from the core, but not part of the superfast jets. This
material moves outward in a direction not quite perpendicular to the direction
of the jets. Discovered with the VLBA in 2000, this material had been seen only
in one-time snapshots before, but the movie shows its the steady evolution of
its movement for the first time.

That motion was the key to a possible answer to two riddles — the source of the
slower-moving material itself and the source of whatever the jet blobs are
hitting when they brighten.

"What seems most plausible to us is that the accretion disk is putting out a
broad wind," Rupen explained.

That broad wind from the disk hits a denser wind coming from the "normal"
companion star to generate the radio waves seen coming from the nonjet region.
The same disk-generated wind could be the source of the material that
replenishes the regions where the jet blobs brighten, the researchers say.

"The motion we measure for this slower-moving material is fast enough — about
10,000 kilometers per second — to put new material in a brightening region
before the jet circles around to that spot again," Mioduszewski said.

Because accretion disks like that around the dense central star of SS 433 are
known to be unstable, any wind put out by such a disk could vary, putting out
symmetric chunks in opposite directions. This, the scientists think, may explain
why the jet brightening regions don’t always get replenished with the material
needed to cause brightening.

"We still have more questions than answers about this microquasar, but the VLBA
movie shows us that following the system on a daily basis with such
greatly-detailed images is the most powerful tool available so far to understand
these phenomena," Rupen said.

The astronomers now hope to follow SS 433 with the VLBA for an entire, 164-day
cycle of the jet wobble. At the same time, they would like to observe the object
with visible-light telescopes, then follow up with larger-scale images using the
NSF’s Very Large Array (VLA) radio telescope. The VLA images would trace blob
motions in the jets beyond the distances traced with the VLBA.

SS 433 and Microquasars

SS 433 was first noted in the 1960s by astronomers Bruce Stephenson and Nicholas
Sanduleak, who included it in a catalog they published of stars with unusual
features in their spectra. As the 433rd object in Stephenson and Sanduleak’s
catalog, it became known as SS 433.

In 1978, David Clark and Paul Murdin identified SS 433 as the visible-light
counterpart of a small object that had been found to be emitting both radio
waves and X-rays. The small object also sat within a large supernova remnant
called W50. Clark and Murdin, using the Anglo-Australian Telescope in Australia,
also produced a spectrum of SS 433 that showed strange features. In addition,
the object not only varied in its brightness, but features within the spectrum
changed.

By 1979, further research, including work by Bruce Margon and George Abell, had
shown that SS 433 was producing jets of material moving in opposite directions.
The strange stellar system received a wealth of media coverage, dubbed "the star
that is both coming and going" in one story. A 1981 Sky & Telescope article was
entitled, "SS433 — Enigma of the Century."

The late Robert Hjellming of NRAO spearheaded studies of motions within the
radio-emitting jets of SS 433 in the early 1980s.

SS 433 was the first example of what are now termed microquasars, binary systems
with either a neutron star or black hole orbited by another star, and emitting
jets of material at high speeds. With the VLA’s discovery of jets moving at 92
percent of the speed of light in an object called GRS 1915+105 in 1994, such
systems became known as microquasars. Several others have since been discovered
and studied.

Because microquasars in our own Milky Way Galaxy are thought to produce their
high-speed jets of material through processes similar to those that produce jets
from the cores of galaxies, the nearby microquasars serve as a convenient
"laboratory" for studying the physics of jets. The microquasars are closer and
show changes more quickly than their larger cousins.

The Very Long Baseline Array

The VLBA is a system of ten radio-telescope antennas, each with a dish 25 meters
(82 feet) in diameter and weighing 240 tons. From Mauna Kea on the Big Island of
Hawaii to St. Croix in the U.S. Virgin Islands, the VLBA spans more than 5,000
miles, providing astronomers with the sharpest vision of any telescope on Earth
or in space. Dedicated in 1993, the VLBA has an ability to see fine detail
equivalent to being able to stand in New York and read a newspaper in Los Angeles.

The VLBA’s scientific achievements include making the most accurate distance
measurement ever made of an object beyond the Milky Way Galaxy; the first
mapping of the magnetic field of a star other than the Sun; movies of motions in
powerful cosmic jets and of distant supernova explosions; the first measurement
of the propagation speed of gravity; and long-term measurements that have
improved the reference frame used to map the Universe and detect tectonic
motions of Earth’s continents.

The VLBA is operated from the NRAO’s Array Operations Center in Socorro, NM.

The National Radio Astronomy Observatory is a facility of the National Science
Foundation, operated under cooperative agreement by Associated Universities, Inc.

[NOTE: Images supporting this release are available at
http://www.nrao.edu/pr/2004/ss433/ ]

SpaceRef staff editor.