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Hard X-ray emission from the eastern jet of SS 433 powering the W50 `Manatee' nebula: Evidence for particle re-acceleration by Safi-Harb, Samar; Mac Intyre, Brydyn; Zhang, Shuo; Pope, Isaac; Zhang, Shuhan; Saffold, Nathan; Mori, Kaya; Gotthelf, Eric V.; Aharonian, Felix; Band, Matthew; Braun, Chelsea; Fang, Ke; Hailey, Charles; Nynka, Melania; Rho, Chang D. is a scholarly article available to read on EtoBox.

What is Hard X-ray emission from the eastern jet of SS 433 powering the W50 `Manatee' nebula: Evidence for particle re-acceleration about?

We present a broadband X-ray study of W50 (`the Manatee nebula'), the complex region powered by the microquasar SS 433, that provides a test-bed for several important astrophysical processes. The W50 nebula, a Galactic PeVatron candidate, is classified as a supernova remnant but has an unusual double-lobed morphology likely associated with the jets from SS 433. Using NuSTAR, XMM-Newton, and Chandra observations of the inner eastern lobe of W50, we have detected hard non-thermal X-ray emission up to $\sim$30 keV, originating from a few-arcminute size knotty region (`Head') located $\lesssim$ 18$^{\prime}$ (29 pc for a distance of 5.5 kpc) east of SS 433, and constrain its photon index to 1.58$\pm$0.05 (0.5-30 keV band). The index gradually steepens eastward out to the radio `ear' where thermal soft X-ray emission with a temperature $kT$$\sim$0.2 keV dominates. The hard X-ray knots mark the location of acceleration sites within the jet and require an equipartition magnetic field of the order of $\gtrsim$12$\mu$G. The unusually hard spectral index from the `Head' region challenges classical particle acceleration processes and points to particle injection and re-acceleration in the sub

Author

Safi-Harb, Samar; Mac Intyre, Brydyn; Zhang, Shuo; Pope, Isaac; Zhang, Shuhan; Saffold, Nathan; Mori, Kaya; Gotthelf, Eric V.; Aharonian, Felix; Band, Matthew; Braun, Chelsea; Fang, Ke; Hailey, Charles; Nynka, Melania; Rho, Chang D.

Published

2022

Language

EN