Figure 17 from Efficient Photometric Selection of Quasars from the Sloan Digital Sky Survey. II. ∼1,000,000 Quasars from Data Release 6

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Efficient Photometric Selection of Quasars from the Sloan Digital Sky Survey. II. ∼1,000,000 Quasars from Data Release 6

Authors: Gordon T. Richards, Adam D. Myers, Alexander G. Gray, Ryan N. Riegel, Robert C. Nichol, Robert J. Brunner, Alexander S. Szalay, Donald P. Schneider, and Scott F. Anderson

RICHARDS et al. 2009 The Astrophysical Journal Supplement Series 180 67.

Provider: AAS Journals

Caption: Figure 17.

Histogram of measured proper motions for the entire catalog (solid), known quasars (dashed), and known stars (dotted). Due to measurement errors, stationary objects can have nonzero proper motion. Thus, we adopt a value of 20 mas/year as the cutoff for "moving" objects. For bright objects, a less conservative cutoff can be used.

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