When NASA agreed to help Assistant Professor of Physics Aleksandar Diamond-Stanic observe a distant galaxy, the agency threw in a bonus: seats for the professor and his students aboard the world鈥檚 largest airborne observatory.
Known as the Stratospheric Observatory for Infrared Astronomy, or SOFIA, the repurposed Boeing 747 carries a 2.5-meter telescope capable of detecting infrared radiation from billions of light-years away.
Flying at 40,000 feet, SOFIA is able to rise above many of the infrared emissions from Earth鈥檚 atmosphere that might interfere with readings from such a faraway galaxy.
Assistant Professor of Physics Aleksandar Diamond-Stanic snaps a selfie with his students, Jose Ruiz 鈥�19 and Becca Minsley 鈥�20, in front of SOFIA, the world’s largest airborne observatory.
A powerful telescope at a great height was what Diamond-Stanic needed to observe the galaxy J1613+2834, which is 4.7 billion light-years away and has a black hole at the center.
Ultimately, he wants to parse out 鈥渢he ultimate power source of the light produced by such galaxies, in particular the balance between light from newly formed stars and light from a supermassive black hole,鈥� he says.
Part of a consortium, led by Christy Tremonti of the University of Wisconsin鈥揗adison, that studies such galaxies to understand star formation, Diamond-Stanic works closely with 乐播传媒 students on these questions. He invited two of them along for the ride: Jos茅 Ruiz 鈥�19 of Lawrence, Mass., and Becca Minsley 鈥�20 of New York City.
Before takeoff, Becca Minsley 鈥�20 and Jose Ruiz 鈥�19 pose in front of SOFIA’s 2.5-meter telescope, which can detect infrared emissions from billions of light-years away. (Courtesy of Aleksandar Diamond-Stanic)
Ruiz and Minsley had both spent summers in Diamond-Stanic鈥檚 Galaxies Lab. And both had traveled with Diamond-Stanic to New Mexico鈥檚 Apache Point Observatory. Minsley has worked alongside other students in the lab analyzing data from the Hubble Space Telescope.
鈥淚t鈥檚 cool to see the ways to try to get any data, any information about these types of galaxies from all of these different sources,鈥� Minsley says.
“In reality the telescope was not moving. The airplane was moving around the telescope.鈥�
To get data from this particular source, Diamond-Stanic, Ruiz, and Minsley traveled to Palmdale, Calif., where SOFIA is based, on Sept. 21. On the day of the flight, Minsley was unable to go along, but after safety and scientific briefings, Diamond-Stanic and Ruiz boarded the plane.
SOFIA took off with some uncertainty 鈥� though its telescope is one of the most powerful around, detecting a galaxy 4.7 billion light-years away was 鈥減ushing the limits of what anyone鈥檚 actually tried with SOFIA,鈥� Diamond-Stanic said.
Assistant Professor of Physics Aleksandar Diamond-Stanic (center) and his research students Becca Minsley 鈥�20 and Jos茅 Ruiz 鈥�19 pose outside the college’s Stephens Observatory just before heading off to California. (Theophil Syslo/乐播传媒 College)
As the sun set, SOFIA flew from Palmdale over Los Angeles and off the coast. Over the next 10 hours, the plane crisscrossed the Pacific Ocean, turning whenever the telescope needed to point to a different part of the sky. Surrounded by computer monitors that display the data it collects, the telescope sticks out an open door near the back of the aircraft.
鈥淚 noticed that the telescope was moving,鈥� Ruiz said, 鈥渂ut in reality the telescope was not moving. The airplane was moving around the telescope.鈥�
鈥淭hat鈥檚 our galaxy!鈥�
For the first few hours, the 乐播传媒 team tried to catch up on schoolwork and listened to the chatter between the pilots and air traffic control and among the NASA scientists aboard. Then, midway through the flight, SOFIA turned northeast toward British Columbia so that the telescope pointed at Diamond-Stanic鈥檚 target galaxy.
Ruiz and Diamond-Stanic watched the monitors as the data came in, looking for any sign of the galaxy. Soon, a shape appeared. A technician drew a circle around it. Diamond-Stanic snapped a picture.
鈥淭hat鈥檚 our galaxy!鈥� he said. To a lay person, it looked like a white blob. But 鈥渋t鈥檚 beautiful to me,鈥� Diamond-Stanic said.
SOFIA will make a total of five observations of J1613+2834 over the next month. NASA scientists will then process the data, subtracting the infrared emissions of the sky near Earth so that the galaxy will be easier to observe. Diamond-Stanic, along with colleagues at several universities and students in his own lab, will further analyze the data.
Data from the SOFIA telescope feeds into a computer monitor on the aircraft, allowing Aleksandar Diamond-Stanic and Jose Ruiz 鈥�19 to 鈥漵ee鈥� their target galaxy. (Courtesy of Aleksandar Diamond-Stanic)
But in addition to collecting valuable data, Diamond-Stanic hopes the trip exposed his students to a 鈥渓arger astronomical community.鈥�
鈥淚t鈥檚 an opportunity for students to see what these research-class facilities look like and what it might be like to work at one,鈥� he says.
Minsley said that seeing the SOFIA data gave her a more comprehensive sense of how astronomers and astrophysicists gather information, whether it鈥檚 from the Hubble Space Telescope or a mountaintop observatory or 40,000 feet in the air.
鈥淭he coolest part was realizing the connection between all these other projects,鈥� she says. 鈥淚t鈥檚 like trying to collect puzzle pieces, or scraps of clues, to try and create a composite image of what鈥檚 really happening.鈥�
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