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We present Chandra ACIS-I and ACIS-S observations ($\sim$200 ks in total) ofthe X-ray luminous elliptical galaxy NGC 4636, located in the outskirts of theVirgo cluster. A soft band (0.5-2 keV) image shows the presence of a brightcore in the center surrounded by an extended X-ray corona and two pronouncedquasi-symmetric, 8 kpc long, arm-like features. Each of this features definesthe rimof an ellipsoidal bubble. An additional bubble-like feature, whosenorthern rim is located $\sim2$ kpc south of the north-eastern arm, is detectedas well. We present surface brightness and temperature profiles across the rimsof the bubbles, showing that their edges are sharp and characterized bytemperature jumps of about 20-25%. Through a comparison of the observedprofiles with theoretical shock models, we demonstrate that a scenario wherethe bubbles were produced by shocks, probably driven by energy depositedoff-center by jets, is the most viable explanation to the X-ray morphologyobserved in the central part of NGC 4636.

The unusual X-ray morphology of NGC4636 revealed by deep Chandra observations: cavities and shocks created by past AGN outbursts