Dying Radio Galaxies In Clusters
| dc.creator | Murgia, M. | |
| dc.creator | Parma, P. | |
| dc.creator | de Ruiter, H. R. | |
| dc.creator | Mack, K. -H. | |
| dc.creator | Fanti, R. | |
| dc.date | 2004-05-05 | |
| dc.date | 2004-05-26 | |
| dc.date.accessioned | 2026-07-07T02:13:07Z | |
| dc.date.available | 2026-07-07T02:13:07Z | |
| dc.description | We report the recent discovery of three `dying' radio galaxies belonging to the WENSS minisurvey sample: WNB1734+6407, WNB1829+6911 and WNB1851+5707. These sources have been selected on the basis of their extremely steep broad-band radio spectra, which is a strong indication that these objects either belong to the rare class of dying radio galaxies or that we are observing `fossil' radio plasma remaining from a previous nuclear activity. Deep spectral index images obtained with the Very Large Array confirmed that in these sources the central engine has ceased to be active for a significant fraction of their lifetime although their extended lobes have not yet completely faded away. In one case, WNB1829+6911, fossil radio lobes are seen in conjunction with newly restarting jets. We found that each source is located (at least in projection) at the center of an X-ray emitting cluster. We argue that their intriguing association with clusters implies that the pressure of the dense intracluster medium, perhaps a cooling flow, prevents quick liquidation of a fossil radio lobe through adiabatic expansion. On statistical ground we deduce that the duration of the dying phase for a radio source in cluster is one order of magnitude higher with respect to that of a radio galaxy in the field. | |
| dc.description | Conference proceeding: X-Ray and Radio Connections Santa Fe, New Mexico, 3-6 February 2004; 5 pages, 2 figures; Corrected typos in table 1 and some text changes made in section 5 | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0405091 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0405091 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/7700 | |
| dc.subject | Astrophysics | |
| dc.title | Dying Radio Galaxies In Clusters | |
| dc.type | text |