An X-ray survey of the 2 Jy sample - II. X-ray emission from extended structures

作者：Mingo B; Hardcastle M J; Ineson J; Mahatma V; Croston J H; Dicken D; Evans D A; Morganti R; Tadhunter C

来源：Monthly Notices of the Royal Astronomical Society, 2017, 470(3): 2762-2779.

DOI：10.1093/mnras/stx1307

• galaxies: active
• radio continuum: galaxies
• X-rays: galaxies

The 2 Jy sample is a survey of radio galaxies with flux densities above 2 Jy at 2.7 GHz. As part of our ongoing work on the southern subset of 2 Jy sources, in paper I of this series we analysed the X-ray cores of the complete 2 Jy sample with redshifts 0.05 < z < 0.7. For this work we focus on the X-ray emission associated with the extended structures (jets, lobes, and environments) of the complete subset of 2 Jy sources with 0.05 < z < 0.2 that we have observed with Chandra. We find that hotspots and jet knots are ubiquitous in Fanaroff-Riley class II (FRII) sources, which also inhabit systematically poorer environments than the Fanaroff-Riley class I (FRI) sources in our sample. Spectral fits of the hotspots with good X-ray statistics invariably show properties consistent with synchrotron emission, and we show that inverse-Compton mechanisms underpredict the X-ray emission we observe by 1-2 orders of magnitude. Inverse-Compton emission is detected from many of the lobes in our sample, and we find that the lobes of the FRII sources show magnetic fields lower by up to an order of magnitude than expected from equipartition extrapolations. This is consistent with previous results, which show that most FRII sources have electron energy densities higher than minimum energy requirements.

• 出版日期2017-9
• 单位中国地震局