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For the first time, we investigate the X‐ray/infrared (IR) correlation for star‐forming galaxies (SFGs) at  z ∼ 1, using SPIRE submm data from the recently launched  Herschel Space Observatory  and deep X‐ray data from the 2‐Ms  Chandra Deep Field ‐North survey. We examine the X‐ray/IR correlation in the soft X‐ray (SX; 0.5–2 keV) and hard X‐ray (HX; 2–10 keV) bands by comparing our  z ∼ 1 SPIRE‐detected SFGs to equivalently IR‐luminous ( L  IR  &gt; 10 10  L ⊙ ) samples in the local/low‐redshift Universe. Our results suggest that the X‐ray/IR properties of the SPIRE SFGs are on average similar to those of their local counterparts, as we find no evidence for evolution in the  L  SX / L  IR  and  L  HX / L  IR  ratios with redshift. We note, however, that at all redshifts, both  L  SX / L  IR  and  L  HX / L  IR  are strongly dependent on IR luminosity, with luminous and ultraluminous IR galaxies (LIRGs and ULIRGs;  L  IR  &gt; 10 11  L ⊙ ) having up to an order of magnitude lower values than normal IR galaxies ( L  IR  &lt; 10 11  L ⊙ ). We derive a  L  SX – L  IR  relation and confirm the applicability of an existing  L  HX – L  IR  relation for both local and distant LIRGs and ULIRGs, consistent with a scenario where X‐ray luminosity is correlated with the star formation rate.

Herschel /HerMES: the X‐ray–infrared correlation for star‐forming galaxies at z ∼ 1