Herschel/HerMES: The X-ray - Infrared correlation for star-forming galaxies at z~1
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).
Keywords
Cite
@article{arxiv.1107.1373,
title = {Herschel/HerMES: The X-ray - Infrared correlation for star-forming galaxies at z~1},
author = {M. Symeonidis and A. Georgakakis and N. Seymour and R. Auld and J. Bock and D. Brisbin and V. Buat and D. Burgarella and P. Chanial and D. L. Clements and A. Cooray and S. Eales and D. Farrah and A. Franceschini and J. Glenn and M. Griffin and E. Hatziminaoglou and E. Ibar and R. J. Ivison and A. M. J. Mortier and S. J. Oliver and M. J. Page and A. Papageorgiou and C. P. Pearson and I. Pérez-Fournon and M. Pohlen and J. I. Rawlings and G. Raymond and G. Rodighiero and I. G. Roseboom and M. Rowan-Robinson and Douglas Scott and A. J. Smith and K. E. Tugwell and M. Vaccari and J. D. Vieira and L. Vigroux and L. Wang and G. Wright},
journal= {arXiv preprint arXiv:1107.1373},
year = {2015}
}
Comments
16 pages, 6 figures, accepted for publication in MNRAS