NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-27 T03:53:54 PDT
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For refcode 2001MNRAS.326.1127W:
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NED Abstract

Copyright by Royal Astronomical Society. 2001MNRAS.326.1127W Chandra measurements of the X-ray core and cluster of 3C 220.1 D.M. Worrall, M. Birkinshaw, M.J. Hardcastle and C.R. Lawrence Accepted 2001 May 9. Received 2001 May 2; in original form 2001 January 22 ABSTRACT We report results of an 18-ks exposure with the ACIS instrument on Chandra of the powerful z = 0.62 radio galaxy 3C 220.1. The X-ray emission separates into cluster gas of emission-weighted kT ~ 5 keV, 0.7-12 keV luminosity (to a radius of 45 arcsec) of 5.6 x 10^44^ erg s^-1^ and unresolved emission (coincident with the radio core). While the extended X-ray emission is clearly thermal in nature, a straightforward cooling-flow model, even in conjunction with a point-source component, is a poor fit to the radial profile of the X-ray emission. This is despite the fact that the measured properties of the gas suggest a massive cooling flow of ~130 M_sun_ yr^-1^, and the data show weak evidence for a temperature gradient. The central unresolved X-ray emission has a power-law spectral energy index {alpha} ~ 0.7 and 0.7-12 keV luminosity of 10^45^ erg s^-1^, and any intrinsic absorption is relatively small. The two-point spectrum of the core emission between radio and X-ray energies has {alpha}_rx_ = 0.75. Since this is a flatter spectrum than seen in other sources where the X-ray emission is presumed to be radio-related, regions close to the active galactic nucleus (AGN) in this source may dominate the central X-ray output, as is believed to be the case for lobe-dominated quasars. Simple unification models would be challenged if this were found to be the case for a large fraction of high-power radio galaxies. Keywords: radiation mechanisms: non-thermal - galaxies: active - galaxies: clusters: individual: 3C 220.1 - galaxies: individual: 3C 220.1 - X-rays: galaxies.
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