Image Details
Caption: Fig. 10.
Histogram distribution of X‐ray hardness ratio for the optically faint X‐ray–bright sources [log(f2–10 keV/fR) > 1), comparing with these sources with 1.0 > log(f2–10 keV/fR) > 0.0. The two distributions are distinguishable according to the K‐S test at the 98.7% significance level.
© 2004. The American Astronomical Society. All rights reserved. Printed in U.S.A.