Fermi Maps an Active Galaxy’s ‘Smokestack Plumes’

If our eyes could see radio waves, the nearby galaxy Centaurus A (Cen A) would be one of the biggest and brightest objects in the sky, nearly 20 times the apparent size of a full moon. What we can’t see when looking at the galaxy in visible light is that it lies nestled between a pair of giant radio-emitting gas plumes ejected by its supersized black hole. Each plume is nearly a million light-years long.

NASA’s Fermi Gamma-Ray Space Telescope maps gamma rays, radiation that typically packs 100 billion times the energy of radio waves. Nevertheless, and to the surprise of many astrophysicists, Cen A’s plumes show up clearly in the satellite’s first 10 months of data. The study appears in Thursday’s edition of Science Express.

“This is something we’ve never seen before in gamma rays,” said Teddy Cheung, a Fermi team member at the Naval Research Laboratory in Washington. “Not only do we see the extended radio lobes, but their gamma-ray output is more than ten times greater than their radio output.” If gamma-ray telescopes had matured before their radio counterparts, astronomers would have instead classified Cen A as a “gamma-ray galaxy.”

Also known as NGC 5128, Cen A is located about 12 million light-years away in the constellation Centaurus and is one of the first celestial radio sources identified with a galaxy. “A hallmark of radio galaxies is the presence of huge, double-lobed radio-emitting structures around otherwise normal-looking elliptical galaxies,” said Jürgen Knödlseder, a Fermi collaborator at the Center for the Study of Space Radiation in Toulouse, France. “Cen A is a textbook example.”

Astronomers classify Cen A as an “active galaxy,” a term applied to any galaxy whose central region exhibits strong emissions at many different wavelengths. “What powers these emissions is a well-fed black hole millions of times more massive than our sun,” said Yasushi Fukazawa, a co-author of the study at Hiroshima University in Japan. “The black hole somehow diverts some of the matter falling toward it into two oppositely directed jets that stream away from the center.”

Fueled by a black hole estimated at hundreds of millions of times the sun’s mass, Cen A ejects magnetized particle jets moving near the speed of light. Over the course of tens of millions of years, these jets puffed out two giant bubbles filled with magnetic fields and energetic particles — the radio lobes we now see. The radio waves arise as high-speed electrons spiral through the lobes’ tangled magnetic fields.

But where do gamma rays — the highest-energy form of light — come from?

The entire universe is filled with low-energy radiation — radio photons from the all-pervasive cosmic microwave background, as well as infrared and visible light from stars and galaxies. The presence of this radiation is the key to understanding Cen A’s gamma rays.

“When one of these photons collides with a super-fast particle in the radio lobes, the photon receives such an energy boost, it becomes a gamma ray,” explained co-author Lukasz Stawarz at the Japan Aerospace Exploration Agency in Sagamihara, Japan.

Although it sounds more like billiards than astrophysics, this process, called inverse Compton scattering, is a common way of making cosmic gamma rays. For Cen A, an especially important aspect is the case where photons from the cosmic microwave background ricochet off of the highest-energy particles in the radio lobes.

In dozens of active galaxies, this process has been shown to produce X-rays. But the Cen A study marks the first case where astronomers have solid evidence that microwave photons can be kicked up to gamma-ray energies.

Fermi cataloged hundreds of blazars and other types of active galaxies in its first year. Before its mission ends, that number may reach several thousand. But because Cen A is so close, so large and so vigorous, it may be the only active galaxy Fermi will view this way.

With Centaurus A, Fermi hit the jackpot.

Proof  of  Global Warming:Then why denial?

Ice loss from the Greenland ice sheet, which has been increasing during the past decade over its southern region, is now moving up its northwest coast, according to a new international study.

Led by the Denmark Technical Institute’s National Space Institute in Copenhagen and involving the University of Colorado at Boulder, the study indicated the ice-loss acceleration began moving up the northwest coast of Greenland starting in late 2005. The team drew their conclusions by comparing data from NASA’s Gravity and Recovery Climate Experiment satellite system, or GRACE, with continuous GPS measurements made from long-term sites on bedrock on the edges of the ice sheet.

Watch the video

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About bruceleeeowe
An engineering student and independent researcher. I'm researching and studying quantum physics(field theories). Also searching for alien life.

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