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arXiv · 1107.1373

Herschel/HerMES: The X-ray - Infrared correlation for star-forming galaxies at z~1

M. Symeonidis·A. Georgakakis·N. Seymour·R. Auld·J. Bock·D. Brisbin·V. Buat·D. Burgarella·P. Chanial·D. L. Clements·A. Cooray·S. Eales·D. Farrah·A. Franceschini·J. Glenn·M. Griffin·E. Hatziminaoglou·E. Ibar·R. J. Ivison·A. M. J. Mortier·S. J. Oliver·M. J. Page·A. Papageorgiou·C. P. Pearson·I. Pérez-Fournon·M. Pohlen·J. I. Rawlings·G. Raymond·G. Rodighiero·I. G. Roseboom·M. Rowan-Robinson·Douglas Scott·A. J. Smith·K. E. Tugwell·M. Vaccari·J. D. Vieira·L. Vigroux·L. Wang·G. Wright
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Abstract

For the first time, we investigate the X-ray/infrared (IR) correlation for star-forming galaxies at z~1, using SPIRE submm data from the recently-launched Herschel Space Observatory and deep X-ray data from the 2Ms Chandra deep field north (CDFN) 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 star-forming galaxies (SFGs) to equivalently IR-luminous (L_IR >10^10 L_sun) 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 infrared galaxies (LIRGs and ULIRGs,L_IR >10^11 L_sun) having up to an order of magnitude lower values than normal infrared galaxies (L_IR <10^11 L_sun). 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 (SFR).

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M. Symeonidis, A. Georgakakis, N. Seymour, R. Auld, J. Bock, D. Brisbin, V. Buat, D. Burgarella, P. Chanial, D. L. Clements, A. Cooray, S. Eales, D. Farrah, A. Franceschini, J. Glenn, M. Griffin, E. Hatziminaoglou, E. Ibar, R. J. Ivison, A. M. J. Mortier, S. J. Oliver, M. J. Page, A. Papageorgiou, C. P. Pearson, I. Pérez-Fournon, M. Pohlen, J. I. Rawlings, G. Raymond, G. Rodighiero, I. G. Roseboom, M. Rowan-Robinson, Douglas Scott, A. J. Smith, K. E. Tugwell, M. Vaccari, J. D. Vieira, L. Vigroux, L. Wang, G. Wright. 2011-07-07. Herschel/HerMES: The X-ray - Infrared correlation for star-forming galaxies at z~1. https://doi.org/10.1111/j.1365-2966.2011.19405.x

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