We present the results of a Suzaku observation of Abell 1674 , an optically very rich ( richness class 3 ) cluster cataloged as z = 0.1066 .
We discover the He-like Fe K-shell line from the central region for the first time , and find that the X-ray spectrum yields a high redshift of 0.215 ^ { +0.007 } _ { -0.006 } .
On the other hand , the spectrum of the southwestern region is fitted with a redshift of 0.11 \pm 0.02 by the He-like Fe L-shell lines , consistent with the optically determined value .
The gas temperature , metal abundance , and core radius of the X-ray emission in the central region are 3.8 \pm 0.2 keV , 0.20 \pm 0.05 Z _ { \odot } and 450 \pm 40 kpc , respectively , while those in the southwestern region are 2.0 \pm 0.2 keV , 0.41 ^ { +0.17 } _ { -0.13 } Z _ { \odot } and 220 ^ { +90 } _ { -70 } kpc , respectively .
These parameters are typical for clusters .
We thus conclude that Abell 1674 consists of two independent clusters , A1674-C at z \sim 0.22 and A1674-SW at z \sim 0.11 , overlapping along the line of sight .
The X-ray luminosities of A1674-C within r = 2 Mpc is 15.9 \pm 0.6 \times 10 ^ { 43 } { erg s ^ { -1 } } in the 0.1 - 2.4 keV energy band , while that for A1674-SW is 1.25 \pm 0.07 \times 10 ^ { 43 } { erg s ^ { -1 } } .
Both are consistent with those expected from the L - T relation of clusters within a factor of 2 .
This is another support for our conclusion .