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We report on the X-ray evolution over the last ~9 Gyr of cosmic history(i.e., since z = 1.4) of late-type galaxy populations in the Chandra DeepField-North and Extended Chandra Deep Field-South (CDF-N and E-CDF-S,respectively; jointly CDFs) survey fields. Our late-type galaxy sample consistsof 2568 galaxies, which were identified using rest-frame optical colors and HSTmorphologies. We utilized X-ray stacking analyses to investigate the X-rayemission from these galaxies, emphasizing the contributions from normalgalaxies that are not dominated by active galactic nuclei (AGNs). Over thisredshift range, we find significant increases (factors of ~5--10) in theX-ray--to--optical mean luminosity ratio (L_X/L_B) and theX-ray--to--stellar-mass mean ratio (L_X/M*) for galaxy populations selected byL_B and M*, respectively. When analyzing galaxy samples selected via SFR, wefind that the mean X-ray--to--SFR ratio (L_X/SFR) is consistent with beingconstant over the entire redshift range for galaxies with SFR = 1--100 Msolyr^-1, thus demonstrating that X-ray emission can be used as a robust indicatorof star-formation activity out to z = 1.4. We find that the star-formationactivity (as traced by X-ray luminosity) per unit stellar mass in a givenredshift bin increases with decreasing stellar mass over the redshift range z =0.2--1, which is consistent with previous studies of how star-formationactivity depends on stellar mass. Finally, we extend our X-ray analyses toLyman break galaxies at z ~ 3 and estimate that L_X/L_B at z ~ 3 is similar toits value at z = 1.4.

Tracing the Mass-Dependent Star Formation History of Late-Type Galaxies using X-ray Emission: Results from the Chandra Deep Fields