Astronomers normally observe galaxies by observing light these objects emit, but some tricky galaxies require a different approach.
, and different telescopes are able to observe these cosmic objects in different wavelengths of light to form a full picture.
But, when a galaxy is located along the same line of sight as another, more distant, source of bright light, there's another way to go about these galactic observations. As light passes through a background galaxy toward a foreground galaxy, for instance, gas and dust in the foreground galaxy will absorb some of the background one's wavelengths.
He and his team have spotted several absorbing galaxies by parsing light from reddened quasars, but once this is done, they are faced with a much more challenging task: hunting for light emitted by the absorbing galaxy itself. When situated exactly behind a galaxy, quasars tend to disrupt our view of foreground galaxies because they are so immensely bright. So much so that they essentially overwhelm the combined light of every star in an entire galaxy.
This makes spotting an absorbing galaxy with its own light output akin to trying to spot a firefly perched on the lamp of a lighthouse while standing onshore. While this might prove too intimidating a challenge for many, however, Fynbo and colleagues relish it. Unfortunately, the scientists haven’t yet identified the light coming from their recently-uncovered, 11-billion-year-old absorbing galaxy, but the absorption patterns this object has revealed are remarkable. The galaxy, seen as it was when our 13.
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