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A Distant Supermassive Black Hole Emits Giant “Death Rays” Larger Than Our Galaxy

Astronomers have released a new X-ray/radio composite image of the distant galaxy Pictor A, showing a huge jet of high-energy particles produced by a super-massive black hole.  They were also able to determine how this jet, over three times the size of the Milky Way galaxy, produces such powerful X-ray emissions. 

In the 2014 film Interstellar, Matthew McConaughey and friends were shown exploring a series of planets orbiting a super-massive (but relatively benign) black hole in a distant galaxy.

The black hole, called “Gargantua,” was supposed to have an event horizon—that is, a point of no return—about as large as the Earth’s orbit; nevertheless, Gargantua was depicted as fairly quiescent and neighborly.

But the reality of these colossal cosmic nightmares, as a recent image from NASA’s Chandra X-ray Observatory shows, is something very different.

The newly released picture shows the terrifying power of an actual super-massive black hole located in the galaxy Pictor A, some 500 million light years distant.  This black hole is about 40 million times the mass of the Sun (that’s about 10 times larger than the black hole at the center of our own galaxy), and if it were to replace the Sun within our Solar System, its event horizon would swallow the orbits of both Mercury and Venus.

So it’s pretty big.

Unlike Gargantua, however, the Pictor A black hole is an energetic and ferocious beast, lashing out at the universe with all the considerable power at its disposal.  The new image shows how the material being consumed by the black hole—stars, planets, interstellar gas, unwary astronauts (kidding)—releases a tremendous surplus of energy as it swirls around the event horizon in a massive accretion disk.

All of this unbridled energy is channeled into two immense jets of particles that pierce the intergalactic medium at nearly the speed of light.  In fact, these particle beams are so powerful that the observed jet—which is pointed roughly in the direction of the Earth—maintains its integrity for a distance of nearly 300,000 light years.

That’s over three times the length of our own Milky Way galaxy!

Which just serves to underscore the unfathomable energies involved.  The new image—which was compiled over 15 years from Chandra data, and is combined with radio imagery from the Australia Telescope Compact Array—also betrays a fainter “counterjet.”  Because it is on the opposite side of the Pictor A galaxy, moving away from Earth, this counterjet is far less visible.

The radio data, which is red in the image (blue represents the Chandra data), also show two huge “radio lobes,” each many times larger than the Milky Way, caused by the jet interacting with intergalactic gas, and a blue X-ray “hotspot” on the far right, the result of shock waves produced by the jet.

Annotated image of the Pictor A galaxy and jets. Credit: X-ray: NASA/CXC/Univ of Hertfordshire/M.Hardcastle et al., Radio: CSIRO/ATNF/ATCA

The researchers who studied the new data were able to determine that the X-rays generated by the jets of the Pictor A super-massive black hole are most likely caused by what is called “synchrotron emission.”  In this mechanism, X-rays are emitted by electrons caught up and spiraling around in powerful magnetic fields.

The process is not well understood, but it is believed that super-massive black holes also possess enormous magnetic fields, along which subatomic particles are accelerated to fantastic speeds, producing the polar jets so often observed emanating from quasars, radio galaxies, and other forms of active galactic nuclei.

They were also able to rule out a competing theory: the notion that electrons flung at near light-speed from the central black hole collide with photons from the cosmic microwave background (CMB).  Theoretically, such a collision should boost the CMB photons into the X-ray part of the spectrum.  But the X-ray signatures did not match this scenario, effectively eliminating it from contention.

Whatever the case, it’s safe to assume there aren’t any inhabitable planets circling the super-massive black hole of Pictor A, and that even Matthew McConaughey would think twice before exploring the environment of this monster.



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