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We investigated ram-pressure effects by an intracluster wind on an inner diskof spiral galaxies by a hydrodynamical simulation. Even if the wind is mild andnot strong enough to strip the gas disk, the ram pressure disturbs orbits ofthe inter-arm gas significantly. This results in asymmetric dense moleculararms in the inner few kpc region of a galaxy. This mechanism would explain theasymmetric CO gas distributions in the central regions often observed in Virgospirals.Comment: To appear in PASJ. 7 pages, 3 gif figure

Ram-Pressure Effects on Dense Molecular Arms in the Central Regions of Spiral Galaxies by Intracluster Medium