Journal Article

<i>Herschel</i>/HerMES: the X-ray–infrared correlation for star-forming galaxies at <i>z</i>∼<i>1</i>

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 and G. Wright

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 417, issue 3, pages 2239-2252
Published in print November 2011 | ISSN: 0035-8711
Published online October 2011 | e-ISSN: 1365-2966 | DOI:
Herschel/HerMES: the X-ray–infrared correlation for star-forming galaxies at z∼1

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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 (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 LSXLIR relation and confirm the applicability of an existing LHXLIR relation for both local and distant LIRGs and ULIRGs, consistent with a scenario where X-ray luminosity is correlated with the star formation rate.

Keywords: galaxies: general; galaxies: high-redshift; galaxies: starburst; infrared: galaxies; X-rays: galaxies

Journal Article.  10656 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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