Intermittent jet activity in the radio galaxy 4C 29.30? |
| |
Authors: | M. Jamrozy,C. Konar,D. J. Saikia, . Stawarz,K.-H. Mack, A. Siemiginowska |
| |
Affiliation: | Obserwatorium Astronomiczne, Uniwersytet Jagielloński, ul. Orła 171, PL-30244 Kraków, Poland;National Centre for Radio Astrophysics, TIFR, Pune University Campus, Post Bag 3, Pune 411 007, India;Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305, USA;Stanford Linear Accelerator Center, Menlo Park, CA 94025, USA;Istituto Nazionale di Astrofisica, Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, Italy;Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA |
| |
Abstract: | We present radio observations at frequencies ranging from 240 to 8460 MHz of the radio galaxy 4C 29.30 (J0840+2949) using the Giant Metrewave Radio Telescope (GMRT), the Very Large Array (VLA) and the Effelsberg telescope. We report the existence of weak extended emission with an angular size of ∼520 arcsec (639 kpc) within which a compact edge-brightened double-lobed source with a size of 29 arcsec (36 kpc) is embedded. We determine the spectrum of the inner double from 240 to 8460 MHz and show that it has a single power-law spectrum with a spectral index of ∼0.8. Its spectral age is estimated to be ≲33 Myr. The extended diffuse emission has a steep spectrum with a spectral index of ∼1.3 and a break frequency ≲240 MHz. The spectral age is ≳200 Myr, suggesting that the extended diffuse emission is due to an earlier cycle of activity. We re-analyse archival X-ray data from Chandra and suggest that the X-ray emission from the hotspots consists of a mixture of non-thermal and thermal components, the latter being possibly due to gas which is shock heated by the jets from the host galaxy. |
| |
Keywords: | galaxies: active galaxies: individual: 4C 29.30 galaxies: nuclei radio continuum: galaxies |
|
|