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We present results from Chandra observations of the X-ray starburst galaxiesNGC 3310 and NGC 2276. We detect 27 discrete sources in NGC 3310, and 19discrete sources in NGC 2276 with luminosities above $\mathrm{1.0\times10^{38}\ erg\ s^{-1}}$. The majority of the sources have photon indices of1.7-2.0, typical for X-ray binaries. Both galaxies have large numbers ofultra-luminous X-ray sources (ULXs; sources with $\mathrm{L(0.3-10.0\keV)>10^{39}\ erg\ s^{-1}}$), 14 for NGC 3310 concentrated on the circumnuclearstar-forming ring and north spiral arm and 11 for NGC 2276 with the brighterones on the west side of the galaxy which is compressed due to harassment bythe intra-group medium it is moving into. We find for both galaxies that theULX-hosting areas are located above the general Lx-SFR scaling relations whileother areas either follow or fall below the scaling relations. This indicatesthat sub-galactic regions follow the galaxy-wide scaling relations but withmuch larger scatter resulting from the age (and possibly metallicity) of theirlocal stellar populations in agreement with recent theoretical andobservational results. Such differences in age could be the origin of thescatter we observe in the low SFR regime in the Lx-SFR scaling relations.

Do sub-galactic regions follow the galaxy-wide X-ray scaling relations? The example of NGC 3310 and NGC 2276