A 30 ks Chandra ACIS-I observation of Kes 79 reveals rich spatial structures , including many filaments , three partial shells , a loop and a “ protrusion ” .
Most of them have corresponding radio features .
Regardless of the different results from two non-equilibrium ionization ( NEI ) codes , temperatures of different parts of the remnant are all around 0.7 keV , which is surprisingly constant for a remnant with such rich structure .
If thermal conduction is responsible for smoothing the temperature gradient , a lower limit on the thermal conductivity of \sim 1/10 of the Spitzer value can be derived .
Thus , thermal conduction may play an important role in the evolution of at least some SNRs .
No spectral signature of the ejecta is found , which suggests the ejecta material has been well mixed with the ambient medium .
From the morphology and the spectral properties , we suggest the bright inner shell is a wind-driven shell ( WDS ) overtaken by the blast wave ( the outer shell ) and estimate the age of the remnant to be \sim 6 kyr for the assumed dynamics .
Projection is also required to explain the complicated morphology of Kes 79 .