Large Scale Cavities Surrounding Microquasars Inferred from Evolution of their Relativistic Jets - Astrophysics > High Energy Astrophysical Phenomena

Large Scale Cavities Surrounding Microquasars Inferred from Evolution of their Relativistic Jets - Astrophysics > High Energy Astrophysical Phenomena - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: The black hole X-ray transient XTE J1550-564 has undergone a strong outburstin 1998 and two relativistic X-ray jets have been detected years later with the$\it Chandra$ X-ray observatory; the eastern jet was found previously to havedecelerated after its first detection. Here we report a full analysis of theevolution of the western jet; significant deceleration is also detected in thewestern side. Our analysis indicates that there is a cavity outside the centralsource and the jets first traveled with constant velocity and then were sloweddown by the interactions between the jets and the interstellar medium ISM.The best fitted radius of the cavity is $\sim$0.31 pc on the eastern side and$\sim$0.44 pc on the western side, and the densities also show asymmetry, of$\sim$0.034 cm$^{-3}$ on the east to $\sim$0.12 cm$^{-3}$ on the west. The bestfitted magnetic fields on both sides are $\sim$0.5 mG. Similar analysis is alsoapplied to another microquasar system, H 1743-322, and a large scale lowdensity region is also found. Based on these results and the comparison withother microquasar systems, we suggest a generic scenario for microquasar jets,classifying the observed jets into three main categories, with different jetmorphologies and sizes corresponding to different scales of vacuousenvironments surrounding them. We also suggest that either continuous jets oraccretion disk winds, or both may be responsible for creating these cavities.Therefore X-ray jets from microquasars provide us with a promising method ofprobing the environment of accreting black holes.

Autor: J. F. Hao, S. N. Zhang

Fuente: https://arxiv.org/