The multi-wavelength quasar survey - IV. Quasars in the Leo cluster

Abstract

We aim to provide a quasar sample that is more complete than any previous surveys by using a combined selection technique to reduce the selection effects. Here we present the observational results for the X-ray candidates in the field of the Leo Cluster. We found 33 X-ray AGNs in this field of which 10 are new discoveries. The X-ray data and optical spectra of these AGNs are given. We also study the near-IR properties of the X-ray-selected AGNs by using the data from 2MASS. Most of the AGNs in our sample span the color range 0.0 <  B − J  < 2.5, 1.0 <  J − K s  < 2.0 and 0.5 <  H − K s  < 1.2.