The peculiar radio galaxy 4C 35.06: a case for recurrent AGN activity?

A. Shulevski R. Morganti 1, 2 P. D. Barthel 3 M. Murgia 4 R. J. Van Weeren G. J. White M. Brüggen 5 M. Kunert-Bajraszewska M. Jamrozy P. N. Best 6 H. J. A. Röttgering 7 K. T. Chyzy F. De Gasperin L. Bîrzan G. Brunetti M. Brienza D. A. Rafferty 8 J. Anderson 9 R. Beck 10 A. Deller P. Zarka D. Schwarz E. Mahony E. Orrú 9 M. E. Bell M. J. Bentum G. Bernardi 11 A. Bonafede F. Breitling 12 J. W. Broderick 5, 13 H. R. Butcher D. Carbone B. Ciardi E. De Geus 14 S. Duscha J. Eislöffel 15 D. Engels H. Falcke 16 R. A. Fallows 17 R. Fender 18 C. Ferrari 19 W. Frieswijk M. A. Garrett Jean-Mathias Grießmeier 20, 21 A. W. Gunst G. Heald M. Hoeft J. Hörandel A. Horneffer A. J. Van Der Horst H. Intema E. Juette A. Karastergiou V. I. Kondratiev M. Kramer 22 M. Kuniyoshi G. Kuper P. Maat G. Mann R. Mcfadden 9 D. Mckay-Bukowski 23 J. P. Mckean 9 H. Meulman D. D. Mulcahy H. Munk 9 M. J. Norden H. Paas 24 M. Pandey-Pommier 25 R. Pizzo A. G. Polatidis W. Reich A. Rowlinson A. M. M. Scaife 26 M. Serylak J. Sluman O. Smirnov M. Steinmetz J. Swinbank Michel Tagger 21 Y. Tang C. Tasse 27, 28 S. Thoudam M. C. Toribio 29 R. Vermeulen C. Vocks R. A. M. J. Wijers M. W. Wise O. Wucknitz
Abstract : Using observations obtained with the LOw Fequency ARray (LOFAR), the Westerbork Synthesis Radio Telescope (WSRT) and archival Very Large Array (VLA) data, we have traced the radio emission to large scales in the complex source 4C 35.06 located in the core of the galaxy cluster Abell 407. At higher spatial resolution (~4"), the source was known to have two inner radio lobes spanning 31 kpc and a diffuse, low-brightness extension running parallel to them, offset by about 11 kpc (in projection). At 62 MHz, we detect the radio emission of this structure extending out to 210 kpc. At 1.4 GHz and intermediate spatial resolution (~30"), the structure appears to have a helical morphology. We have derived the characteristics of the radio spectral index across the source. We show that the source morphology is most likely the result of at least two episodes of AGN activity separated by a dormant period of around 35 Myr. The AGN is hosted by one of the galaxies located in the cluster core of Abell 407. We propose that it is intermittently active as it moves in the dense environment in the cluster core. Using LOFAR, we can trace the relic plasma from that episode of activity out to greater distances from the core than ever before. Using the the WSRT, we detect HI in absorption against the center of the radio source. The absorption profile is relatively broad (FWHM of 288 km/s), similar to what is found in other clusters. Understanding the duty cycle of the radio emission as well as the triggering mechanism for starting (or restarting) the radio-loud activity can provide important constraints to quantify the impact of AGN feedback on galaxy evolution. The study of these mechanisms at low frequencies using morphological and spectral information promises to bring new important insights in this field.
Type de document :
Article dans une revue
Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 579 (A27), 10 p. 〈10.1051/0004-6361/201425416〉
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Soumis le : mercredi 1 juillet 2015 - 15:23:34
Dernière modification le : jeudi 7 février 2019 - 16:10:17

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A. Shulevski, R. Morganti, P. D. Barthel, M. Murgia, R. J. Van Weeren, et al.. The peculiar radio galaxy 4C 35.06: a case for recurrent AGN activity?. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 579 (A27), 10 p. 〈10.1051/0004-6361/201425416〉. 〈insu-01170435〉



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