Stars more than eight times the
mass of the Sun are said to be born
inside this "collapsing nebula."
On May 14, 2009, the European Space
Agency (ESA)
launched the Herschel
Space Telescope from the Guiana
Space Centre, Kourou, French Guiana.
Both Herschel and the Planck
spacecraft were onboard the Ariane 5
rocket, since they were both set to
occupy independent orbits around a
stable configuration known as
LaGrange point L2. They
were separated shortly after launch.
Herschel currently occupies a
Lissajous orbit around L2, 1.5
million kilometers from Earth's
night side. The telescope employs a
3.5 meter primary mirror, almost
twice the size of the one on Hubble,
coupled to infrared detectors that
are cooled to temperatures near
absolute zero.
According to a recent
ESA press release,
Herschel has been studying what are
called "high-mass protostars" inside
a nebula dubbed RCW 120. In the
image at the top of the page, a
bubble of gas and dust is seen,
supposedly expanding outward because
of the radiative pressure from a
star in the center, increasing the
density of material in the bubble's
wall. The compression is said to
have allowed new stars to form,
since the increased density causes
increased gravitational attraction
among the particles, initiating the
accepted process of star formation.
Astrophysicists continue to
puzzle over the fact that some stars
accrete more mass during their
gestation than is theoretically
possible. Since the collapsing cloud
of gas and dust that gives birth to
stars is supposed to envelop them in
a fragile shell, a large formation
should generate more radiation as it
condenses than its structure can
survive. In other words, the shell
of gas and dust around those
embryonic stars should blow away
before that much mass can
accumulate.
The most likely reason that the
object Herschel has discovered does
not obey the tenets of conventional
theory is that it is not what
astronomers think it is. The
somewhat concentric filaments prompt
plasma physicists to conclude that
we are not seeing an expanding
bubble in RCW 120, but are looking
down into a Birkeland current
“cable,” pinching itself into an
hourglass form that is creating and
powering the central star. The
instabilities within the nebula are
plasma instabilities that can pull
in material and compress it, as well
as cause it to spin.
The toroidal filaments couple to
the hourglass-shaped current sheets
and are subject to diocotron
instabilities: the current flow
through the plasma will sometimes
form vortices that can evolve into
distorted curlicue shapes. This
phenomenon has been witnessed in
many laboratory experiments, as well
as in the polar aurorae.
The bubble's temperature
(infrared emissions) is also open to
question. Most observable radiation
in the cosmos is synchrotron
radiation. Thermal radiation comes
from random atomic collisions. Its
peak wavelength corresponds to the
temperature of the atoms.
Synchrotron radiation is created by
electrons moving in a magnetic
field.
Since moving electrons constitute
an electric current, and that
current travels along a magnetic
field, it is a “field-aligned
current,” otherwise known as a
Birkeland current. Therefore, a
Universe composed almost entirely of
plasma, organized into Birkeland
currents, will primarily emit
synchrotron radiation and not
thermal radiation. Synchrotron
radiation provides no temperature
information. Since it comes from a
nonrandom process, “temperature”
should not even enter into the
equation.
The "massive protostars" in RCW
120 are most likely massive electric
currents flowing through plasma.
Stephen Smith
Hat tip to James Parker