They occur when charged space particles, typically from the sun, stream along a planet's magnetic field lines and interact with atmospheric atoms, producing not only optical light but
also radio emissions.
Not exact matches
Discovered initially by lighthouse - like beams of
radio emission, more recent research has found that energetic pulsars
also produce beams of high energy gamma rays.
A blazar, a galaxy that kicks out fluctuating X-rays, might
also have been responsible, but blazars are easily identified by their strong
radio emissions, something not apparent in this source (Nature, DOI: 10.1038 / nature08083).
Now, astronomers have overcome that problem by tracking bright spots of
radio emission from the Triangulum Galaxy —
also known as M33 — which the new study locates at 2.4 million light years from Earth.
Also, the
radio observation results of molecular line
emission of methanol revealed in vivid detail an hourglass structure created by gas outflows spreading outward while thrusting the ambient gas cloud away.
In the next few years, the array will
also scan for artificial
radio emissions as part of the search for extraterrestrial intelligence (SETI) at lower, neglected frequencies than past SETI missions.
We know that for energies of modest to intermediate energy, the culprit or the source of the acceleration appears to be the shock front that surrounds a [an] expanding supernova blast wave; that is to say, we have a star that undergoes a massive cosmic explosion [and] drives a strong shock wave out into the surrounding interstellar medium, and the gas around the shock wave, and all the magnetic fields associated with it are capable of accelerating particles to very high energies; and
also incidentally magnifying and amplifying the magnetic field associated with that shock front and giving a lot of x-ray
emission and
radio emission and so on, and so we've understood that.
Astronomers
also discovered weak, long - lasting
radio emissions coming from within 130 light - years of FRB 121102, suggesting the two are related — though we don't know how, if at all.
Later, some other blue star - like objects at large redshifts were discovered to have no
radio emission, but they are
also called quasars.
In addition to detecting the bright bursts from FRB 121102, the VLA observations
also revealed an ongoing, persistent source of weaker
radio emission in the same region.
«Many sources that emit transient X-ray flares, such as black hole binary star systems,
also have associated
radio emission.
Massive planets — «super Jupiters» circling stars beyond the Sun —
also might reveal themselves through bursts of
radio emission at the frequency of this survey, the astronomers speculated.
They
also plan to keep monitoring the steady
radio emission from the vicinity of the Spitler burst to see if its properties change in time, as expected based on that theory.
For comparison, this pulsar's
radio emission is some 250 times weaker than that from the famous pulsar in the Crab Nebula (the remnant of an explosion in the year 1054 recorded by Chinese astronomers and possibly
also by Native Americans of the Anasazi tribe in modern - day Arizona and New Mexico).
By detecting this pulsar in the
radio spectrum, astronomers may now follow its evolution with greater ease and flexibility than with X-ray telescopes on satellites, study the pulsar
emission mechanisms, and
also characterize the dynamic interstellar medium between the Earth and the pulsar.
The team
also observed
radio emission from carbon sulfide (CS) and silicon monoxide (SiO) to reveal the detailed structure of the molecular outflow from the baby star.
That same year, another team made an even more - detailed image of the region that showed not only the mini-spiral but
also a distinct, separate point of
radio emission corresponding to the exact center of the Galaxy.
The
radio emission rose and fell several times, and the relative intensity at different
radio wavelengths
also changed.
As it turns out,
radio observations of this source have
also reported monotonically brightening
emission.
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