A Chandra ACIS-S observation of PKS 2152-699 reveals thermal emission from a diffuse region around the core and a hotspot located 10″ northeast from the core .
This is the first detection of thermal X-ray radiation on kiloparsec scales from an extragalactic radio source .
Two other hotspots located 47″ north-northeast and 26″ southwest from the core were also detected .
Using a Raymond-Smith model , the first hotspot can be characterized with a thermal plasma temperature of 2.6 \times 10 ^ { 6 } K and an electron number density of 0.17 cm ^ { -3 } .
These values correspond to a cooling time of about 1.6 \times 10 ^ { 7 } yr .
In addition , an emission line from the hotspot , possibly Fe xxv , was detected at rest wavelength 10.04Å . The thermal X-ray emission from the first hotspot is offset from the radio emission but is coincident with optical filaments detected with broadband filters of HST /WFPC2 .
The best explanation for the X-ray , radio , and optical emission is that of a ‘ jet-cloud ’ interaction . The diffuse emission around the nucleus of PKS 2152-699 can be modeled as a thermal plasma with a temperature of 1.2 \times 10 ^ { 7 } K and a luminosity of 1.8 \times 10 ^ { 41 } erg s ^ { -1 } .
This emission appears to be asymmetric with a small extension toward Hotspot A , similar to a jet .
An optical hotspot ( EELR ) is seen less than an arcsecond away from this extension in the direction of the core .
This indicates that the extension may be caused by the jet interacting with an inner ISM cloud , but entrainment of hot gas is unavoidable .
Future observations are discussed .