title: Iron emission lines from extended x-ray jets in SS 433: reheating of atomic nuclei.
abstract: Powerful relativistic jets are among the most ubiquitous and energetic observational consequences of accretion around supermassive black holes in active galactic nuclei and neutron stars and stellar-mass black holes in x-ray binary (XRB) systems. But despite more than three decades of study, the structure and composition of these jets remain unknown. Here we present spatially resolved x-ray spectroscopy of arc second-scale x-ray jets from XRB SS 433 analyzed with the Chandra advanced charge-coupled device imaging spectrometer. These observations reveal evidence for a hot continuum and Doppler-shifted iron emission lines from spatially resolved regions. Apparently, in situ reheating of the baryonic component of the jets takes place in a flow that moves with relativistic bulk velocity even more than 100 days after launch from the binary core.
authors.affiliation: Astronomical Institute "Anton Pannekoek," University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, Netherlands. migliari@astro.uva.nl
authors.forename: Simone
authors.initials: S
authors.lastname: Migliari
authors.forename: Rob
authors.initials: R
authors.lastname: Fender
authors.forename: Mariano
authors.initials: M
authors.lastname: Méndez