VLBA "Movie" Gives Scientists New Insights On Workings of MysteriousMicroquasars (Forwarded)

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Embargoed For Release: 11:00 a.m., EST, Monday, January 5, 2004

VLBA "Movie" Gives Scientists New Insights On Workings of Mysterious
Microquasars

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/ ]