Discovery of the TeV Emission from the JetInteraction Regions of SS 433 with HAWC. (arXiv:1908.06429v1 [astro-ph.HE])
<a href="http://arxiv.org/find/astro-ph/1/au:+Rho_C/0/1/0/all/0/1">Chang Dong Rho</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Zhou_H/0/1/0/all/0/1">Hao Zhou</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+BenZvi_S/0/1/0/all/0/1">Segev BenZvi</a> (for the HAWC Collaboration)
The High Altitude Water Cherenkov (HAWC) observatory recently published the
discovery of SS 433 as a TeV source, reporting the observation of multi-TeV
gamma-ray emission from the jet interaction regions e1 and w1, suggesting
in-situ particle acceleration. This showed the first direct evidence of
acceleration in jets at energies greater than a few TeV. SS 433 was the first
microquasar to be discovered and is still considered special in that the
accretion is supercritical and the luminosity of the system is very high
($sim10^{40}$ erg s$^{-2}$). The lobes of the supernova remnant W 50 in which
the jets terminate, about 40 parsecs from the central binary, are expected to
accelerate charged particles, and indeed radio and X-ray emission consistent
with electron synchrotron emission in a magnetic field have been observed. SS
433 has also been a strong candidate for hadronic acceleration due to
spectroscopic evidence of ionized nuclei in the inner jets. However,
multiwavelength fits including the HAWC measurements favor the leptonic
production of the observed gamma rays. Here, we present new follow-up
measurements of the jet interaction regions of SS 433 using the most recent
data from HAWC.
The High Altitude Water Cherenkov (HAWC) observatory recently published the
discovery of SS 433 as a TeV source, reporting the observation of multi-TeV
gamma-ray emission from the jet interaction regions e1 and w1, suggesting
in-situ particle acceleration. This showed the first direct evidence of
acceleration in jets at energies greater than a few TeV. SS 433 was the first
microquasar to be discovered and is still considered special in that the
accretion is supercritical and the luminosity of the system is very high
($sim10^{40}$ erg s$^{-2}$). The lobes of the supernova remnant W 50 in which
the jets terminate, about 40 parsecs from the central binary, are expected to
accelerate charged particles, and indeed radio and X-ray emission consistent
with electron synchrotron emission in a magnetic field have been observed. SS
433 has also been a strong candidate for hadronic acceleration due to
spectroscopic evidence of ionized nuclei in the inner jets. However,
multiwavelength fits including the HAWC measurements favor the leptonic
production of the observed gamma rays. Here, we present new follow-up
measurements of the jet interaction regions of SS 433 using the most recent
data from HAWC.
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