Study of an interaction between the jet and an interstellar medium of M87 with a spectral analysis by using Chandra

Abstract

Both a thermal component and a non thermal component as an interaction between the jet and an interstellar medium are studied with an exposure time of 800 ks of Chandra. It is confirmed that an X ray energy spectra for the nucleus and the knot D is well described with a power law model as synchrotron emission. It is found that a power law model is rejected statistically for HST-1 and the knot A and an X ray energy spectra is well described with a combination model of a power law and a thermal bremsstrahlung of temperature of 0.2 keV and metal abundance of 0.00. There is a possibility that gas in a jet is heated by a shock as interaction between the jet and an interstellar medium and it is observed as thermal emission. The flux of a non thermal bremsstrahlung from the jet as an interaction between accelerated electrons and an interstellar medium is calculated from an X ray result and it is found that there is no contribution from both nucleus and the knot HST-1 to the observed flux with Fermi.