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arXiv 1107.1373astro-ph.CO
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Herschel/HerMES:z~1恒星形成星系的X射线-红外关联

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. … 展开作者

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

摘要:

利用最近发射的Herschel空间天文台的SPIRE亚毫米观测数据和2 Ms Chandra深场北巡天(CDFN)的深X射线观测数据,首次研究了z~1恒星形成星系的X射线/红外(IR)相关。通过比较z~1 SPIRE探测到的恒星形成星系(SFG)和本地/低红移宇宙中的红外发光(L_IR >10^10 L_sun)样本,研究了软X射线(SX,0.5-2 keV)和硬X射线(HX,2-10 keV)波段的X射线/IR相关性。我们的研究结果表明,SPIRE SFG的X射线/IR特性与其局域SFG的相似,因为我们没有发现LSX/LIR和LHX/LIR比值随红移而演化的证据。然而,我们注意到,在所有的红移中,L_SX/L_IR和L_HX/L_IR都强烈地依赖于红外光度,明亮和超明亮的红外星系(LIRG和ULIRGs,L_IR >10^11 L_sun)的值比正常的红外星系(L_IR <10^11 L_sun)低一个数量级。我们推导出一个L_SX-L_IR关系,并确认现有的L_HX-L_IR关系的本地和遥远的LIRGs和ULIRGs的适用性,符合的情况下,X射线光度与恒星形成率(SFR)。

英文摘要:

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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