Abstract
We present results on the physical states of three highredshift
powerful radio galaxies (3C292 atz = 0.7, 3C184 at z= 1, and 3C322 atz = 1.7). They were obtained by combining radio measurements with X-ray
measurements from XMM-Newton that separate spectrally and/or spatially radio-related and hot-gas X-ray emission. Originally observed as part of a program to trace clusters of galaxies at high redshift, none of the
sources is found to lie in a rich X-ray-emitting environment similar to those of some powerful radio galaxies at low redshift, although the estimated gas pressures are sufficient to confine the radio lobes. The weak gas emission is a particularly interesting result for 3C184, where a gravitational arc is seen, suggesting the presence of a very massive cluster. Here Chandra data
complement the XMM-Newton measurements in spatially separating X-ray extended emission from that associated with the nucleus and rather small radio source. 3C292 is the source for which the X-ray-emitting gas is measured with the greatest accuracy, and its temperature of 2 keV and luminosity of 6.5X 1043 erg s-1are both characteristic of a poor cluster. This source allows the most accurate measurement of inverse-Compton X-ray emission associated with the radio lobes. In all structures where the magnetic-field strength can be
estimated through combining measurements of radiosynchrotron
and inverse-Compton X-ray emission, the field strengths are consistent with sources being in a state of minimum total energy
Original language | English |
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Title of host publication | X-Ray and Radio Connections |
Editors | Lorant Sjouwerman, Kristy Dyer |
Volume | 2004 |
Publication status | Published - 2004 |
Event | X-Ray and Radio Connections - Sante Fe, United States Duration: 3 Feb 2004 → 6 Feb 2004 |
Conference
Conference | X-Ray and Radio Connections |
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Country/Territory | United States |
City | Sante Fe |
Period | 3/02/04 → 6/02/04 |