I get excited when I see astronomers using novel techniques to study more distant and more difficult problems in astronomy. In this case, we have a galaxy cluster acting as a lens and some high-resolution spectroscopy to get a 3-dimensional view of a quasar.
A typical quasar is dominated by a point of light coming from the very center of the distant galaxy, specifically from the accretion disk around a supermassive black hole that is pulling matter into it. That bright central quasar can often act as a background light for probing what is in front of that quasar along our line of sight, including the structures within the very same galaxy.
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For this study, a group led by Toru Misawa looks at the broad absorption line features in the spectra of one such quasar, J1029+2623. Such features are not uncommon in quasar spectra as they are a result of some outflow of material away from the accretion disk. Yes, there are things falling in AND things flowing away from the black hole; it's a very turbulent place. In fact, these outflows are key to transporting angular momentum away from the black hole so that more material can fall in. They also can have the side effect of shutting down star formation in other parts of the galaxy. So, they are quite important to understanding the whole evolution of a quasar.