Catching Black Holes On The Fly

By  //  October 12, 2013

Share on Facebook Share on Twitter Share on LinkedIn Share on Delicious Digg This Stumble This

Nustar 'bagged' 10 supermassive black holes

An optical color image of galaxies is seen here overlaid with X-ray data (magenta) from NASA's Nuclear Spectroscopic Telescope Array (NuSTAR). (NASA.gov image)

An optical color image of galaxies is seen here overlaid with X-ray data (magenta) from NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR). (NASA.gov image)

NASA.gov – NASA’s black-hole-hunter spacecraft, the Nuclear Spectroscopic Telescope Array, or NuSTAR, has “bagged” its first 10 supermassive black holes.

The Sculptor galaxy is seen in a new light, in this composite image from NASA's Nuclear Spectroscopic Telescope Array (NuSTAR) and the European Southern Observatory in Chile. (NASA.gov image)

The Sculptor galaxy is seen in a new light, in this composite image from NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR) and the European Southern Observatory in Chile. (NASA.gov image)

The mission, which has a mast the length of a school bus, is the first telescope capable of focusing the highest-energy X-ray light into detailed pictures.

The new black-hole finds are the first of hundreds expected from the mission over the next two years. These gargantuan structures — black holes surrounded by thick disks of gas — lie at the hearts of distant galaxies between 0.3 and 11.4 billion light-years from Earth.

David Alexander

David Alexander

“We found the black holes serendipitously,” explained David Alexander, a NuSTAR team member based in the Department of Physics at Durham University in England and lead author of a new study appearing Aug. 20 in the Astrophysical Journal.

“We were looking at known targets and spotted the black holes in the background of the images.”

Additional serendipitous finds such as these are expected for the mission. Along with the mission’s more targeted surveys of selected patches of sky, the NuSTAR team plans to comb through hundreds of images taken by the telescope with the goal of finding black holes caught in the background.

“We were looking at known targets and spotted the black holes in the background of the images.” -David Alexander

Once the 10 black holes were identified, the researchers went through previous data taken by NASA’s Chandra X-ray Observatory and the European Space Agency’s XMM-Newton satellite, two complementary space telescopes that see lower-energy X-ray light. The scientists found that the objects had been detected before. It wasn’t until the NuSTAR observations, however, that they stood out as exceptional, warranting closer inspection.

This new view of spiral galaxy IC 342, also known as Caldwell 5, includes data from NASA's Nuclear Spectroscopic Telescope Array, or NuSTAR. (NASA.gov image)

This new view of spiral galaxy IC 342, also known as Caldwell 5, includes data from NASA’s Nuclear Spectroscopic Telescope Array, or NuSTAR. (NASA.gov image)

By combining observations taken across the range of the X-ray spectrum, the astronomers hope to crack unsolved mysteries of black holes. For example, how many of them populate the universe?

“We are getting closer to solving a mystery that began in 1962,” said Alexander.

“Back then, astronomers had noted a diffuse X-ray glow in the background of our sky but were unsure of its origin. Now, we know that distant supermassive black holes are sources of this light, but we need NuSTAR to help further detect and understand the black hole populations.”

This X-ray glow, called the cosmic X-ray background, peaks at the high-energy frequencies that NuSTAR is designed to see, so the mission is key to identifying what’s producing the light.  NuSTAR can also find the most hidden supermassive black holes, buried by thick walls of gas.

CLICK HERE FOR MORE INFORMATION


Click here to contribute your news or announcements Free