| Autor: |
Schwartz, D. A., Siemiginowska, A., Snios, B., Worrall, D. M., Birkinshaw, M., Cheung, C. C., Marshall, H., Migliori, G., Wardle, J. F. C., Gobeille, Doug |
| Předmět: |
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| Zdroj: |
Astrophysical Journal; 11/20/2020, Vol. 904 Issue 1, p1-7, 7p |
| Abstrakt: |
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 to 30 keV would be of order 1045 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. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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