Schwartz, D. A.Silverman, J.Birkinshaw, M.Karovska, MargaritaAldcroft, ThomasBarkhouse, W.Green, P.Kim, D.-W.Wilkes, BelindaWorrall, Diana2017-02-132004Schwartz, D. A., J. Silverman, M. Birkinshaw, M. Karovska, T. Aldcroft, W. Barkhouse, P. Green, D.-W. Kim, B. J. Wilkes, and D. M. Worrall. 2004. “Discovery of a Jetlike Structure at the High-Redshift QSO CXOMP J084128.3+131107.” The Astrophysical Journal 605 (2) (March 29): L105–L108. doi:10.1086/420843.0004-637Xhttp://nrs.harvard.edu/urn-3:HUL.InstRepos:30212164The Chandra Multiwavelength Project has discovered a jetlike structure associated with a newly recognized QSO at redshift z = 1.866. The system was 9farcm4 off-axis during an observation of 3C 207. Although significantly distorted by the mirror point-spread function, we use both a ray trace and a nearby bright point source to show that the X-ray image must arise from some combination of point and extended sources, or else from a minimum of three distinct point sources. We favor the former situation, as three unrelated sources would have a small probability of occurring by chance in such a close alignment. We show that interpretation as a jet emitting X-rays via inverse Compton scattering on the cosmic microwave background is plausible. This would be a surprising and unique discovery of a radio-quiet QSO with an X-ray jet, since we have obtained upper limits of 100 μJy on the QSO emission at 8.46 GHz and limits of 200 μJy for emission from the putative jet.en-USGalaxies: jetsQuasars: generalX-rays: galaxiesJournal Article2017-02-1310.1086/420843