Unprecedented Galactic Cosmic Rays Are Accelerating

REMINDER: “In the center of our Galaxy, there is a huge double star, the source of Light and life fo...

REMINDER: “In the center of our Galaxy, there is a huge double star, the source of Light and life for this Galaxy, the Galactic Goddess, the Pleroma, the Galactic Central Sun.

“It breathes and pulses with a regular rhythm, each heartbeat taking 26,000 years to complete.

“Every time the Galactic heart beats, the Galactic center sends a wave of highly charged physical and non-physical particles throughout the Galaxy… We are approaching a Galactic wave right now and it will culminate in the Event.” ~ Cobra, Galactic Wave of Love

A source accelerating Galactic cosmic rays to unprecedented energy discovered at the center of the Milky Way

For more than 10 years the H.E.S.S. observatory in Namibia, run by an international collaboration of 42 institutions in 12 countries, has been mapping the center of our galaxy in very-high-energy gamma rays.

These gamma rays are produced by cosmic rays from the innermost region of the galaxy.

A detailed analysis of the latest H.E.S.S. data, published on 16 March 2016 in Nature, reveals for the first time a source of this cosmic radiation at energies never observed before in the Milky Way: the supermassive black hole at the center of the galaxy, likely to accelerate cosmic rays to energies 100 times larger than those achieved at the largest terrestrial particle accelerator, the LHC at CERN.

The Earth is constantly bombarded by high-energy particles (protons, electrons and atomic nuclei) of cosmic origin, particles that comprise the so-called “cosmic radiation.”

These “cosmic rays” are electrically charged, and are hence strongly deflected by the interstellar magnetic fields that pervade our galaxy.

Their path through the cosmos is randomized by these deflections, making it impossible to directly identify the astrophysical sources responsible for their production.

Thus, for more than a century, the origin of the cosmic rays remains one of the most enduring mysteries of science.

Fortunately, cosmic rays interact with light and gas in the neighborhood of their sources, producing gamma rays. These gamma rays travel in straight lines, undeflected by magnetic fields, and can therefore be traced back to their origin.

When a very-high-energy gamma ray reaches the Earth, it interacts with a molecule in the upper atmosphere, producing a shower of secondary particles that emit a short pulse of “Cherenkov light.”

By detecting these flashes of light using telescopes equipped with large mirrors, sensitive photo-detectors, and fast electronics, more than 100 sources of very-high-energy gamma rays have been identified over the past three decades.

The H.E.S.S. (High Energy Stereoscopic System) observatory in Namibia represents the latest generation of such telescope arrays.

It is operated by scientists from 42 institutions in 12 countries, with major contributions by MPIK Heidelberg, Germany, CEA and CNRS, France.

Today we know that cosmic rays with energies up to approximately 100 teraelectronvolts (TeV) are produced in our galaxy, by objects such as supernova remnants and pulsar wind nebulae.

Theoretical arguments and direct measurements of cosmic rays reaching the Earth indicate, however, that the cosmic-ray factories in our galaxy should be able to provide particles up to one petaelectronvolt (PeV) at least.

While many multi-TeV accelerators have been discovered in recent years, the search for the sources of the highest energy galactic cosmic rays has, so far, been unsuccessful.

Detailed observations of the galactic center region, made by H.E.S.S. over the past 10 years, and published today in the journal Nature, finally provide direct indications for such PeV cosmic-ray acceleration.

During the first three years of observations, H.E.S.S. uncovered a very powerful point source of gamma rays in the galactic-center region, as well as diffuse gamma-ray emission from the giant molecular clouds that surround it in a region approximately 500 light-years across.

These molecular clouds are bombarded by cosmic rays moving at close to the speed of light, which produce gamma rays through their interactions with the matter in the clouds.

A remarkably good spatial coincidence between the observed gamma rays and the density of material in the clouds indicated the presence of one or more accelerators of cosmic rays in that region.

However, the nature of the source remained a mystery.

Deeper observations obtained by H.E.S.S. between 2004 and 2013 shed new light on the processes powering the cosmic rays in this region.
According to Aion Viana (MPIK, Heidelberg), “the unprecedented amount of data and progress made in analysis methodologies enables us to measure simultaneously the spatial distribution and the energy of the cosmic rays.”
With these unique measurements, H.E.S.S. scientists are for the first time able to pinpoint the source of these particles:
“Somewhere within the central 33 light-years of the Milky Way there is an astrophysical source capable of accelerating protons to energies of about one petaelectronvolt, continuously for at least 1,000 years,” says Emmanuel Moulin (CEA, Saclay).
In analogy to the “Tevatron,” the first human-built accelerator that reached energies of 1 TeV, this new class of cosmic accelerator has been dubbed a “Pevatron.”
“With H.E.S.S. we are now able to trace the propagation of PeV protons in the central region of the galaxy,” adds Stefano Gabici (CNRS, Paris).
The center of our galaxy is home to many objects capable of producing cosmic rays of high energy, including, in particular, a supernova remnant, a pulsar wind nebula, and a compact cluster of massive stars.
However, “the supermassive black hole located at the center of the galaxy, called Sgr A*, is the most plausible source of the PeV protons,” says Felix Aharonian (MPIK, Heidelberg and DIAS, Dublin), adding that, “several possible acceleration regions can be considered, either in the immediate vicinity of the black hole, or further away, where a fraction of the material falling into the black hole is ejected back into the environment, thereby initiating the acceleration of particles.”
The H.E.S.S. measurement of the gamma-ray emission can be used to infer the spectrum of the protons that have been accelerated by the central black hole—revealing that Sgr A* is very likely accelerating protons to PeV energies.

Currently, these protons cannot account for the total flux of cosmic rays detected at the Earth.
“If, however, our central black hole was more active in the past,” the scientists argue, “then it could indeed be responsible for the bulk of the galactic cosmic rays that are observed today at the Earth.”
If true, this would dramatically influence the century old debate concerning the origin of these enigmatic particles.

More information: A. Abramowski et al. Acceleration of petaelectronvolt protons in the Galactic Centre, Nature (2016). DOI: 10.1038/nature17147

Journal reference: Nature search and more info website | Provided by: CNRS via Phys.org

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