In space, it sometimes happens that two galaxies are aligned in just the right way that the closer galaxy distorts and magnifies the appearance of the one behind it. For astronomers, finding these alignments is like coming across giant, cosmic magnifying glasses.
Now, a team of astronomers, including Daniel Stern from NASA's Jet Propulsion Laboratory in Pasadena, California, has found several rare examples of this phenomenon, called gravitational lensing, in which the foreground galaxy hosts an actively accreting supermassive black hole.
Such feeding black holes, called quasars, are among the brightest objects in the universe, far outshining the total starlight of their host galaxies. Because they are so bright, it is hard for astronomers to measure the mass of their host galaxies. However, gravitational lenses are invaluable for estimating the mass of a quasar's host galaxy. The amount of the background galaxy's distortion can be used to accurately measure the lensing galaxy's mass.
The team hopes to build an even bigger catalog of these quasar lenses, and to use these data to better understand the interplay between black hole feeding and star formation in galaxy evolution.
Photo credit: NASA, ESA, EPFL (Switzerland); text credit: NASA/JPL.
Note: For more information, see Astronomers Using NASA's Hubble Discover Quasars Acting as Gravitational Lenses; for more images, see PIA15418: Quasar Lenses.
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