Signatures of multiple episodes of AGN activity in the core of Abell
  1795
  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 flatter spectral index, the radio extensions associated with the
furthest 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.
