We present Chandra gas temperature profiles at large radii for a sample of 13 nearby , relaxed galaxy clusters and groups , which includes A133 , A262 , A383 , A478 , A907 , A1413 , A1795 , A1991 , A2029 , A2390 , MKW4 , RXJ1159+5531 , and USGC S152 .
The sample covers a range of average temperatures from 1 to 10 keV .
The clusters are selected from the archive or observed by us to have sufficient exposures and off-center area coverage to enable accurate background subtraction and reach the temperature accuracy of better than 20–30 % at least to r = 0.4 - 0.5 r _ { 180 } , and for the three best clusters , to 0.6 - 0.7 r _ { 180 } .
For all clusters , we find cool gas in the cores , outside of which the temperature reaches a peak at r \sim 0.15 r _ { 180 } and then declines to \sim 0.5 of its peak value at r \simeq 0.5 r _ { 180 } .
When the profiles are scaled by the cluster average temperature ( excluding cool cores ) and the estimated virial radius , they show large scatter at small radii , but remarkable similarity at r > 0.1 - 0.2 r _ { 180 } for all but one cluster ( A2390 ) .
Our results are in good agreement with previous measurements from ASCA by Markevitch et al .
and from Beppo-SAX by DeGrandi & Molendi .
Four clusters have recent XMM-Newton temperature profiles , two of which agree with our results , and we discuss reasons for disagreement for the other two .
The overall shape of temperature profiles at large radii is reproduced in recent cosmological simulations .