Signatures of multiple episodes of AGN activity in the core of Abell 1795
MetadataShow full item record
In this paper we analyze AGN activity signatures in the rich nearby galaxy cluster Abell 1795 aiming to confirm and characterize the long-term feedback history in the system. We combine radio observations at 610 and 235 MHz from the Giant Metrewave Radio Telescope (GMRT) with 3.4 Msec X-ray data from the Chandra Observatory. Extracting radial temperature profiles, as well as X-ray and radio surface brightness profiles in three directions showing major morphological disturbances, we highlight the signatures of activity in the system. For the first time we observe radio emission corresponding to the NW X-ray depression, which provides evidence in favor of the classification of the depression as a cavity. We identify two other X-ray cavities situated NW and SW of the AGN. While the central radio emission corresponding to the inner cavities shows a flatter spectral index, the radio extensions associated with the farthest X-ray cavities consist of aged plasma. All observed signatures both in radio and X-ray are consistent with several consecutive episodes of AGN activity, which gave rise to the observed morphology NW and SW from the core. In the southern region, we confirm the cooling wake hypothesis for the origin of the long tail. The deep X-ray data also allows us to distinguish significant distortions in the tail's inner parts, which we attribute to the activity of the AGN.
Reproduced with permission from Astronomy & Astrophysics, © ESO
Showing items related by title, author, creator and subject.
LOFAR MSSS: The scaling relation between AGN cavity power and radio luminosity at low radio frequenciesKokotanekov, G.; Wise, M.; Heald, G.; McKean, J.; Bîrzan, L.; Rafferty, D.; Godfrey, L.; De Vries, M.; Intema, Hubertus; Broderick, J.; Hardcastle, M.; Bonafede, A.; Clarke, A.; Van Weeren, R.; Röttgering, H.; Pizzo, R.; Iacobelli, M.; Orrú, E.; Shulevski, A.; Riseley, C.; Breton, R.; Nikiel-Wroczynski, B.; Sridhar, S.; Stewart, A.; Rowlinson, A.; Van Der Horst, A.; Harwood, J.; Gürkan, G.; Carbone, D.; Pandey-Pommier, M.; Tasse, C.; Scaife, A.; Pratley, L.; Ferrari, C.; Croston, J.; Pandey, V.; Jurusik, W.; Mulcahy, D. (2017)We present a new analysis of the widely used relation between cavity power and radio luminosity in clusters of galaxies with evidence for strong AGN feedback. We studied the correlation at low radio frequencies using two ...
Jones, S.; McHardy, I.; Moss, D.; Seymour, Nick; Breedt, E.; Uttley, P.; Körding, E.; Tudose, V. (2011)We present intensive quasi-simultaneous X-ray and radio monitoring of the narrow line Seyfert 1 galaxy NGC 4051, over a 16-month period in 2000–01. The X-ray observations were made with the Proportional Counter Array on ...
Rawlings, J.; Page, M.; Symeonidis, M.; Bock, J.; Cooray, A.; Farrah, D.; Guo, K.; Hatziminaoglou, E.; Ibar, E.; Oliver, S.; Roseboom, I.; Scott, D.; Seymour, Nick; Vaccari, M.; Wardlow, J. (2015)© 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. We separate the extragalactic radio source population above~50 µJy into active galactic nuclei (AGN) and star-forming ...