We present X-ray observations of the northern outskirts of the relaxed galaxy cluster A1413 with Suzaku , whose XIS instrument has the low intrinsic background needed to make measurements of these low surface brightness regions .
We excise 15 point sources superimposed on the image above a flux of 1 \times 10 ^ { -14 } erg cm ^ { -2 } s ^ { -1 } ( 2–10 keV ) using XMM-Newton and Suzaku images of the cluster .
We quantify all known systematic errors as part of our analysis , and show our statistical errors encompasses them for the most part .
Our results extend previous measurements with Chandra and XMM-Newton , and show a significant temperature drop to about 3 keV at the virial radius , r _ { 200 } .
Our entropy profile in the outer region ( > 0.5 r _ { 200 } ) joins smoothly onto that of XMM-Newton , and shows a flatter slope compared with simple models , similar to a few other clusters observed at the virial radius .
The integrated mass of the cluster at the virial radius is approximately 7.5 \times 10 ^ { 14 } M _ { \odot } and varies by about 30 % depending on the particular method used to measure it .