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In this work, we use two gas mass fraction samples of galaxy clustersobtained from their X-ray surface brightness observations jointly with recent$H(z)$ data in a flat $\Lambda$CDM framework to impose limits on cosmicopacity. It is assumed that the galaxy clusters are in hydrostatic equilibriumand their gas mass fraction measurement is constant with redshift. We show thatthe current limits on the matter density parameter obtained from X-ray gas massfraction test are strongly dependent on the cosmic transparency assumption evenfor a flat scenario. Our results are consistent with a transparent universewithin $1\sigma$ c.l. in full agreement with other analyses which used type Iasupernovae, gamma ray burst and $H(z)$ data.

X-ray surface brightness observations of galaxy clusters, cosmic opacity and the limits on the matter density parameter