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Published November 2011 | Accepted Version + Published
Journal Article Open

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


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) > 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) > 10^(11) L_⊙) having up to an order of magnitude lower values than normal IR galaxies (L_(IR) < 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.

Additional Information

© 2011 The Authors. Monthly Notices of the Royal Astronomical Society © 2011 RAS. Accepted 2011 July 6. Received 2011 June 7; in original form 2011 March 8. Article first published online: 1 Sep 2011. MS is grateful for MSSL/UCL support. The team is also extremely grateful to Héctor Otí-Floranes, Kazushi Iwasawa and Bret Lehmer, for useful discussions and for providing us with models and data essential for the various comparisons made in this paper. This paper uses data from Herschel's submm photometer SPIRE. SPIRE has been developed by a consortium of institutes led by Cardiff University (UK) and including University of Lethbridge (Canada); NAOC (China); CEA, LAM (France); IFSI, University of Padua (Italy); IAC (Spain); Stockholm Observatory (Sweden); Imperial College London, RAL, UCL-MSSL, UKATC, University of Sussex (UK); Caltech, JPL, NHSC, University of Colorado (USA). This development has been supported by national funding agencies: CSA (Canada); NAOC (China); CEA, CNES, CNRS (France); ASI (Italy); MCINN (Spain); SNSB (Sweden); STFC (UK) and NASA (USA).

Attached Files

Published - Symeonidis2011p16459Mon_Not_R_Astron_Soc.pdf

Accepted Version - 1107.1373.pdf


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