Identifying quasars with astrometric and mid-infrared methods from APOP and ALLWISE⋆

Author： Lattanzi Mario G.   Bucciarelli Beatrice   Lattanzi Mario G.   Lattanzi Mario G.   Lattanzi Mario G.   Lattanzi Mario G.   Lattanzi Mario G.   Lattanzi Mario G.  

Publisher： Edp Sciences

E-ISSN： 1432-0746|618|issue|A144-A144

ISSN： 0004-6361

Source： Astronomy & Astrophysics, Vol.618, Iss.issue, 2018-10, pp. : A144-A144

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Abstract

Context. Quasars are spatially stationary, and they are essential objects in astrometry when defining reference frames. However, the census of quasars is far from complete. Mid-infared colors can be used to find quasar candidates because active galactic nuclei (AGNs) show a peculiar appearance in mid-infrared color, but these methods are incapable of separating quasars from AGNs.

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