Volume 619, November 2018
|Number of page(s)||6|
|Published online||09 November 2018|
Focusing on the extended X-ray emission in 3C 459 with a Chandra follow-up observation
Dipartimento di Fisica, Universitydegli Studi di Cagliari, Complesso Universitario di Monserrato, S. P. Monserrato-Sestukm 0.700, 09042 Monserrato CA, Italy
2 Harvard – Smithsonian Astrophysical Observatory, Cambridge, MA 02138, USA
3 Dipartimento di Fisica, University degli Studi di Torino. via Pietro Giuria 1, 10125 Torino, Italy
4 Istituto Nazionale di Fisica Nucleare, Sezione di Torino, 10125, Torino, Italy
5 Istituto Nazionale di Astrofisica, Sezione di Torino, 10125 Torino, Italy
6 Consorzio Interuniversitario per la Fisica Spaziale (CIFS), via Pietro Giuria 1, 10125 Torino, Italy
7 School of Physics, Astronomy and Mathematics, University of Hertfordshire, College Lane, Hatfield AL10 9AB, UK
Accepted: 25 August 2018
Aims. We investigated the X-ray emission properties of the powerful radio galaxy 3C 459 revealed by a recent Chandra follow-up observation carried out in October 2014 with a 62 ks exposure.
Methods. We performed an X-ray spectral analysis from a few selected regions on an image obtained from this observation and also compared the X-ray image with a 4.9 GHz VLA radio map available in the literature.
Results. The dominant contribution comes from the radio core but significant X-ray emission is detected at larger angular separations from it, surrounding both radio jets and lobes. According to a scenario in which the extended X-ray emission is due to a plasma collisionally heated by jet-driven shocks and not magnetically dominated, we estimated its temperature to be ∼0.8 keV. This hot gas cocoon could be responsible for the radio depolarization observed in 3C 459, as recently proposed also for 3C 171 and 3C 305. On the other hand, our spectral analysis and the presence of an oxygen K edge, blueshifted at 1.23 keV, cannot exclude the possibility that the X-ray radiation originating from the inner regions of the radio galaxy could be intercepted by some outflow of absorbing material intervening along the line of sight, as already found in some BAL quasars.
Key words: galaxies: active / galaxies: clusters: individual: 3C 459 / radio continuum / galaxies: X-rays: general
© ESO 2018
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.