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

Symeonidis, M., Georgakakis, A., Seymour, N., Auld, Robbie Richard, Bock, J., Brisbin, D., Buat, V., Burgarella, D., Chanial, P., Clements, D. L., Cooray, A., Eales, Stephen ORCID:, Farrah, D., Franceschini, A., Glenn, J., Griffin, Matthew Joseph ORCID:, Hatziminaoglou, E., Ibar, E., Ivison, R. J., Mortier, A. M. J., Oliver, S. J., Page, M. J., Papageorgiou, Andreas, Pearson, C. P., Pérez-Fournon, I., Pohlen, Michael, Rawlings, J. I., Raymond, Gwenifer, Rodighiero, G., Roseboom, I. G., Rowan-Robinson, M., Scott, Douglas, Smith, A. J., Tugwell, K. E., Vaccari, M., Vieira, J. D., Vigroux, L., Wang, L. and Wright, G. 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. 10.1111/j.1365-2966.2011.19405.x

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

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Uncontrolled Keywords: galaxies: general; galaxies: high-redshift; galaxies: starburst; infrared: galaxies; X-rays: galaxies
Publisher: Wiley
ISSN: 0035-8711
Last Modified: 20 Oct 2022 09:16

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