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

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Authors
Symeonidis, M.
Georgakakis, A.
Seymour, Nick
Auld, R.
Bock, J.
Brisbin, D.
Buat, V.
Burgarella, D.
Chanial, P.
Clements, D.
Cooray, A.
Eales, S.
Farrah, D.
Franceschini, A.
Glenn, J.
Griffin, M.
Hatziminaoglou, E.
Ibar, E.
Ivison, R.
Mortier, A.
Oliver, S.
Page, M.
Papageorgiou, A.
Pearson, C.
Pérez-Fournon, I.
Pohlen, M.
Rawlings, J.
Raymond, G.
Rodighiero, G.
Roseboom, I.
Rowan-Robinson, M.
Scott, D.
Smith, A.
Tugwell, K.
Vaccari, M.
Vieira, J.
Vigroux, L.
Wang, L.
Wright, G.
Date
2011
Type
Journal Article

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Symeonidis, M. and Georgakakis, A. and Seymour, N. and Auld, R. and Bock, J. and Brisbin, D. and Buat, V. et al. 2011. Herschel/HerMES: The X-ray-infrared correlation for star-forming galaxies at z~1. Monthly Notices of the Royal Astronomical Society. 417 (3): pp. 2239-2252.
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Monthly Notices of the Royal Astronomical Society
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Department of Physics and Astronomy
Remarks

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2011 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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Abstract

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; 0.5-2keV) and hard X-ray (HX; 2-10keV) bands by comparing our z~ 1 SPIRE-detected SFGs to equivalently IR-luminous (LIR < 1010 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 LSX/LIR and LHX/LIR ratios with redshift. We note, however, that at all redshifts, both LSX/LIR and LHX/LIR are strongly dependent on IR luminosity, with luminous and ultraluminous IR galaxies (LIRGs and ULIRGs; LIR < 1011 L☉) having up to an order of magnitude lower values than normal IR galaxies (LIR < 1011 L☉). We derive a LSX-LIR relation and confirm the applicability of an existing LHX-LIR relation for both local and distant LIRGs and ULIRGs, consistent with a scenario where X-ray luminosity is correlated with the star formation rate.