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We present a $Chandra$ study of the hot intragroup medium (hIGM) of thegalaxy group NCG2563. The $Chandra$ mosaic observations, with a total exposuretime of ~430 ks, allow the gas density to be detected beyond $R_{200}$ and thegas temperature out to 0.75 $R_{200}$. This represents the first observationalmeasurement of the physical properties of a poor groups beyond $R_{500}$. Bycapitalizing on the exquisite spatial resolution of $Chandra$ that is capableto remove unrelated emission from point sources and substructures, we are ableto radially constrain the inhomogeneities of gas ("clumpiness"), gas fraction,temperature and entropy distribution. Although there is some uncertainty in themeasurements, we find evidences of gas clumping in the virialization region,with clumping factor of about 2 - 3 at $R_{200}$. The gas clumping-correctedgas fraction is significantly lower than the cosmological baryon budget. Theseresults may indicate a larger impact of the gas inhomogeneities with respect tothe prediction from hydrodynamic numerical simulations, and we discuss possibleexplanations for our findings.

The galaxy group NGC2563