  The intensity of the soft X-Ray background is correlated with the
distribution of galaxies. To demonstrate this, magnitude limited galaxy samples
extracted from bright galaxy catalogues and the Lick counts are utilized.
Significant correlations are detected for all magnitude ranges, i.e. 10<m<18.6.
The local X-ray volume emissivity between 0.5 and 2.0 keV correlated spatially
with the galaxy population falls in the range 8*10^{38} - 10^{39} erg/s/Mpc^3
(H_o = 100 km/s/Mpc). Without evolution, this could account for 30% - 40% of
the total X-ray background, an amount consistent with analogous estimates based
on X-ray experiments at higher energies. The comparison of correlation
amplitudes of the X-ray background with galaxies at different apparent
magnitudes indicates that roughly half of the emission correlated with galaxies
can be produced in extended regions substantially larger than optical extent of
a typical galaxy. A crude estimate for the average size of these sources is 1
Mpc. This extended signal in various correlation functions is possibly produced
by X-ray emission of hot gas in clusters or groups of galaxies, although a
contribution from individual galaxies cannot be ruled out.
