Abstract
I review some of the applications of spatially resolved spectroscopy of multiple QSO lines of sight, including gravitationally lensed quasars, binaries and projected pairs. I focus on size constraints that have been determined for classes of absorbers that range from the intergalactic medium up to damped Lyman alpha systems. I also briefly discuss some insights that can be gained into the QSO environment and its physical properties by using projected pairs with disparate redshifts.
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Ellison, S.L. (2008). Spectroscopy of QSO Pairs. In: Santos, N.C., Pasquini, L., Correia, A.C.M., Romaniello, M. (eds) Precision Spectroscopy in Astrophysics. ESO Astrophysics Symposia. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-75485-5_17
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DOI: https://doi.org/10.1007/978-3-540-75485-5_17
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