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Recent studies have highlighted the potential significance of intraclustermedium (ICM) clumping and its important implications for cluster cosmology andbaryon physics. Many of the ICM clumps can originate from infalling galaxies,as stripped interstellar medium (ISM) mixing into the hot ICM. However, adirect connection between ICM clumping and stripped ISM has not beenunambiguously established before. Here we present the discovery of the firstand still the only known isolated cloud (or orphan cloud, OC) detected in bothX-rays and H$\alpha$ in the nearby cluster Abell 1367. With an effective radiusof 30 kpc, this cloud has an average X-ray temperature of 1.6 keV, a bolometricX-ray luminosity of $\sim 3.1\times 10^{41}$ erg s$^{-1}$ and a hot gas mass of$\sim 10^{10}\ {\rm M}_\odot$. From the MUSE data, the OC shows an interestingvelocity gradient nearly along the east-west direction with a low level ofvelocity dispersion of $\sim 80$ km/s, which may suggest a low level of the ICMturbulence. The emission line diagnostics suggest little star formation in themain H$\alpha$ cloud and a LI(N)ER-like spectrum, but the excitation mechanismremain unclear. This example shows that the stripped ISM, even long time afterthe initial removal from the galaxy, can still induce the ICM inhomogeneities.We suggest that magnetic field can stabilize the OC by suppressing hydrodynamicinstabilities and thermal conduction. This example also suggests that at leastsome ICM clumps are multi-phase in nature and implies that the ICM clumps canalso be traced in H$\alpha$. Thus, future deep and wide-field H$\alpha$ surveycan be used to probe the ICM clumping and turbulence.

An H$\alpha$/X-ray orphan cloud as a signpost of the intracluster medium clumping