Supermassive blackhole detector ready for business

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Supermassive Black Hole Detector Ready for Business

The Sierra Negra volcano in the central Mexican state of Puebla is the site of an ambitious astrophysical project which houses the largest gamma ray observatory ever built on the planet.

After five years of construction, scientists in Mexico say the High Altitude Water Cherenkov Experiment or HAWC, is operating at full capacity. The facility has been hunting cosmic rays in a limited fashion since 2013.

Funded by both public and private money from Mexico and the United States, HAWC hopes to trap gamma ray particles coming from space. The particles are considered the most energetic in the universe and scientists want to learn more about their cosmic origin.

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Supermassive blackhole detector ready for business
SPACE - UNDATED: A Computer Simulated Image released by the NASA shows the gas from a star that is ripped apart by tidal forces as it falls into a black hole in Space. Some of the gas also is being ejected at high speeds into space. Using observations from telescopes in space and on the ground, astronomers gathered the most direct evidence yet for this violent process: a supermassive black hole shredding a star that wandered too close. NASA's orbiting Galaxy Evolution Explorer (GALEX) and the Pan-STARRS1 telescope on the summit of Haleakala in Hawaii were used to help to identify the stellar remains. A flare in ultraviolet and optical light revealed gas falling into the black hole as well as helium-rich gas that was expelled from the system. When the star is torn apart, some of the material falls into the black hole, while the rest is ejected at high speeds. The flare and its properties provide a signature of this scenario and give unprecedented details about the stellar victim. To completely rule out the possibility of an active nucleus flaring up in the galaxy instead of a star being torn apart, the team used NASA's Chandra X-ray Observatory to study the hot gas. Chandra showed that the characteristics of the gas didn't match those from an active galactic nucleus. The galaxy where the supermassive black hole ripped apart the passing star in known as PS1-10jh and is located about 2.7 billion light years from Earth. Astronomers estimate the black hole in PS1-10jh has a mass of several million suns, which is comparable to the supermassive black hole in our own Milky Way galaxy. PHOTOGRAPH BY NASA / Barcroft Media /Barcoft Media via Getty Images
This artist's conception illustrates one of the most primitive supermassive black holes known (central black dot) at the core of a young, star-rich galaxy. (Photo by: Universal History Archive/UIG via Getty Images)
The Herschel Space Observatory has shown that galaxies with the most powerful, active, supermassive black holes at their cores produce fewer stars than galaxies with less active black holes. (Photo by: Universal History Archive/UIG via Getty Images)
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The observatory is made up of 300 tanks each holding 50,000 gallons (190,000 liters) of pure water, as well as detectors capable of sensing and recording Chernakov radiation, a flash of light made up of charged particles produced when they impact the tanks after coming through Earth atmosphere slightly faster than the speed of light.

By measuring the angle and intensity at which these particles hit all 300 sensors over time, the scientists can figure out where the gamma rays originated. The researchers hope that at an elevation of 4,100 meters and sensors arranged over 30 square meters, HAWC will provide the best environment to detect gamma and cosmic rays.

Dr. Jordan Goodman, from the University of Maryland, explained the importance of the observatory.

"We've been interested for a long time in gamma rays. They are meant to point back at space differently. Gamma ray points go straight, they're light, but they're highest energy light so they let us understand where the highest energy particles in the universe come from. So our idea is to build this observatory to give us a wide field view of the sky at the highest energy," said Dr. Goodman.

Thanks to the Earth's rotation, HAWC will be able to hunt gamma rays from two thirds of the sky within a 24-hour period. The scientists hope that by determining the origin of the gamma rays, they can learn more about great cosmic events such as supernovas and black holes that produce them.

Along with mapping the highest producers of energy in distant galaxies, HAWC will also help researchers learn more about our solar system by studying the Sun.

"HAWC looks at the whole sky overhead all the time as the earth turns, so right now we're pointing there but later as the earth turns we're going to be pointing over there. So we survey more than half of the sky all the time and this technique is unusual because somebody yesterday at the conference we had said we should look at gamma rays from the sun, very high energy, no one who does not have a telescope can look at the sun but we can look at the sun because we don't use daylight, we use the gamma rays," added Dr. Goodman.

The observatory is also home to the Large Millimetre Telescope (LMT) - the world's largest single-dish steerable millimeter-wavelength telescope.

Sierra Negra, an extinct volcano to the east of the city of Puebla in central Mexico, was chosen because of its height and mild climate. While oblivious to light pollution, millimeter telescopes work best at altitudes where the level of water vapor in the air is low.

The observatory will work for 10 years, a time frame agreed with the environmental authorities at the Peak of Orizaba. Afterwards the observatory will be dismantled at the natural reserve.

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