![]() ![]() 1998) and two protrusions, the so-called ears. By convention, one discerns in W 50 a spherical component of radius ~ 29′ ( Dubner et al. The torque and elongated appearance of W 50 might be due to the jets, which, however, are not explicitly resolved at the scales of W 50 ( 1° × 2°). W 50 looks like it consists of coils, narrowing to the tips of the nebula like a pyramid. The radio morphology of W 50 closely resembles an achatina, the giant African snail ( Dubner et al. 2016, for a comprehensive review of the origin of W 50). The role of the jets of SS 433 in the formation of the peculiar W 50 is unknown (see Farnes et al. Moreover, this may indicate a region, where the jets decelerate and transmit energy to the nebula, in the interior of W 50, rather than at the nebula shell. (2015), located within the W 50 area, points to one more element in the energy losses of the jets: up to 10s of percent of the jets energy might transform into relativistic particles. The gamma-ray emission revealed by Bordas et al. These jets are radiatively inefficient, which suggests that their huge kinetic energy, of flux L j0 ~ 10 39 erg/s, transforms into the thermal and mechanical energies of W 50. The powerful jets of SS 433 ( Abell & Margon 1979) are so intimately interconnected with the surrounding shell-type radio nebula W 50 that the nebula is thought to be not entirely of supernova origin. Key words: ISM: bubbles / ISM: supernova remnants / ISM: individual objects: W50 / X-rays: individuals: W50 / ISM: jets and outflows / turbulenceĪstrophysical jets derive a significant part of their energy from accretion disks and radically influence their environment. The entrainment model comes to the viscous stress in a jet of a form σ = αP, where the viscosity parameter α is predefined by the model. In this case, the age of the jet should be ≪27 000 yr so as to satisfy the sphericity of W 50. Also, this pressure in our entrainment model gives a deceleration of the jet by ~60% in the bounds of the spherical component of W 50, of radius ~40 pc. In the frame of a theory of the dynamics of radiative supernova remnants and stellar wind bubbles, in combination with other known parameters this pressure restricts the origin of W 50 to a supernova occuring ~100 000 yr ago. From the thermal emission of the eastern X-ray lobe, we determine a pressure of P ~ 3 × 10 -11 erg/cm 3 inside W 50. ![]() X-ray observations suggest that the eastern jet is hollow, persists through W50, and is recollimated to the opening angle of ~30 °. This model fits mass entrainment from the ambient medium into the jets of the radio galaxy 3C 31, the well-studied case of continuously decelerating jets. In order to estimate deceleration of this jet, we devised a simplistic model of the viscous interaction of a jet, via turbulence, with the ambient medium. ![]() We analysed the morphology and parameters of the interior of W 50 using the available observations of the eastern X-ray lobe, which trace the jet. To disentangle the roles of these components, we study the physical conditions of the propagation of the jets of SS 433 inside W 50 and determine the deceleration of the jets. The evolution of the jets of SS 433 on the scale of the nebula W 50 is a Rosetta stone for its origin.Īims. The origin of W 50 is wrapped in the interplay of the wind, supernova remnant, and jets. The radio nebula W 50 harbours the relativistic binary system SS 433, which is a source of powerful wind and jets. Institute of Mathematics, Physics and Information Technologies (IMFIT), Togliatti State University, Belorusskaya 14, 445667 Togliatti, RussiaĬontext. ![]()
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