The Chandra Deep Field North Survey. VIII. X-ray Constraints on Spiral Galaxies from 0.4 < z < 1.5

We present a statistical X-ray study of spiral galaxies in the Hubble Deep Field-North and its Flanking Fields using the Chandra Deep Field North 1 Ms dataset. We find that approximately L_star galaxies with 0.4 < z < 1.5 have ratios of X-ray to B-band luminosity similar to those in the local Universe, although the data indicate a likely increase in this ratio by a factor of approximately 2-3. We have also determined that typical spiral galaxies at 0.4 < z < 1.5 should be detected in the 0.5–2 keV band in the flux range 3-6 X 10^-18 erg cm^-2 s^-1.