The coronavirus pandemic provided a pair of astronomers the free time to travel back through archives of old 1997 data from W. M. Keck Observatory on Mauankea in Hawaii and old X-ray data from NASA’s Chandra X-ray Observatory to unlock a mystery 10-billion light years away surrounding an extremely rare, bright, gravitationally-lensed quasar–the first discovered, spectacularly luminous Einstein ring, named MG 1131+0456, an early universe galaxy– obscured by a feeding black hole stirring up gas and dust, cloaking the ancient object.
The Keck Observatory reports that finding a a quasar that is gravitationally lensed, making it appear brighter and larger, is exceptionally exciting. While slightly over 200 lensed obscured quasars are currently known, the number of lensed obscured quasars discovered is in the single digits.
MG 1131+0456, which was observed in 1987 with the Very Large Array network of radio telescopes in New Mexico. Remarkably, though widely studied, the quasar’s distance or redshift remained a question mark. “This whole paper was a bit nostalgic for me, making me look at papers from the early days of my career, when I was still in graduate school. The Berlin Wall was still up when this Einstein ring was first discovered, and all the data presented in our paper are from the last millennium,” said Daniel Stern, senior research scientist at NASA’s Jet Propulsion Laboratory.
The Lens as a Probe for Dark Matter
“As we dug deeper, we were surprised that such a famous and bright source never had a distance measured for it,” said Stern, senior author of the study. “Having a distance is a necessary first step for all sorts of additional studies, such as using the lens as a tool to measure the expansion history of the universe and as a probe for dark matter.”
Stern and co-author Dominic Walton, an STFC Ernest Rutherford Fellow at the University of Cambridge’s Institute of Astronomy (UK), are the first to calculate the quasar’s distance, a redshift of z = 1.849.
Coronavirus pandemic provided free time to probe old archives
At the time of their research, telescopes around the planet were shuttered due to the coronavirus pandemic (Keck Observatory has since reopened as of May 16); Stern and Walton took advantage of their extended time at home to creatively keep science going by combing through data from NASA’s Wide-field Infrared Survey Explorer (WISE) to search for gravitationally lensed, heavily obscured quasars. While dust hides most active galaxies in visible light surveys, that obscuring dust makes such sources very bright in infrared surveys, such as provided by WISE.
Though quasars are often extremely far away, astronomers can detect them through gravitational lensing, a phenomenon that acts as nature’s magnifying glass. This occurs when a galaxy closer to Earth acts as a lens and makes the quasar behind it look extra bright. The gravitational field of the closer galaxy warps space itself, bending and amplifying the light of the quasar in the background. If the alignment is just right, this creates a circle of light called an Einstein ring, predicted by Albert Einstein in 1936. More typically, gravitationally lensing will cause multiple images of the background object to appear around the foreground object.
Its Distance a Mystery
Once Stern and Walton rediscovered MG 1131+0456 with WISE and realized its distance remained a mystery, they meticulously combed through old data from the Keck Observatory Archive (KOA) and found the Observatory observed the quasar seven times between 1997 and 2007 using the Low Resolution Imaging Spectrometer (LRIS) on the Keck I telescope, as well as the Near-Infrared Spectrograph (NIRSPEC) and the Echellette Spectrograph and Imager (ESI) on the Keck II telescope.
Harvard CfA image of MG 1131+0456
“We were able to extract the distance from Keck’s earliest data set, taken in March of 1997, in the early years of the observatory,” said Walton. “We are grateful to Keck and NASA for their collaborative efforts to make more than 25 years of Keck data publicly available to the world. Our paper would not have been possible without that.”
The team also analyzed NASA’s archival data from the Chandra X-ray Observatory in 2000, in the first year after the mission launched.
With MG 1131+0456’s distance now known, Walton and Stern were able to determine the mass of the lensed galaxy with exquisite precision and use the Chandra data to robustly confirm the obscured nature of the quasar, accurately determining how much intervening gas lies between us and its luminous central regions.
“We can now fully describe the unique, fortuitous geometry of this Einstein ring,” said Stern. “This allows us to craft follow-up studies, such as using the soon-to-launch James Webb Space Telescope to study the dark matter properties of the lensing galaxy.”
“Our next step is to find lensed quasars that are even more heavily obscured than MG 1131+0456,” said Walton. “Finding those needles is going to be even harder, but they’re out there waiting to be discovered. These cosmic gems can give us a deeper understanding of the universe, including further insight into how supermassive black holes grow and influence their surroundings,” says Walton.
The Daily Galaxy, Max Goldberg, via W.M. Keck Observatory