Two Candidate High-Redshift X-ray Jets Without Coincident Radio Jets

Kavli Affiliate: Herman Marshall

| First 5 Authors: Daniel Schwartz, Aneta Siemiginowska, Brad Snios, Diana Worrall, Mark Birkinshaw

| Summary:

We report the detection of extended X-ray emission from two high-redshift
radio quasars. These quasars, J1405+0415 at $z$=3.208 and J1610+1811 at
$z$=3.118, were observed in a Chandra snapshot survey selected from a complete
sample of the radio-brightest quasars in the overlap area of the VLA-FIRST
radio survey and the Sloan Digital Sky Survey. The extended X-ray emission is
located along the line connecting the core to a radio knot or hotspot, favoring
the interpretation of X-ray jets. The inferred rest frame jet X-ray
luminosities from 2–30 keV would be of order 10$^{45}$ erg~s$^{-1}$ if emitted
isotropically and without relativistic beaming. In the scenario of inverse
Compton scattering of the cosmic microwave background (CMB), X-ray jets without
a coincident radio counterpart may be common, and should be readily detectable
to redshifts even beyond 3.2 due to the (1+$z$)$^4$ increase of the CMB energy
density compensating for the (1+$z$)$^{-4}$ cosmological diminution of surface
brightness. If these can be X-ray confirmed, they would be the second and third
examples of quasar X-ray jets without detection of underlying continuous radio
jets.

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