THE X-RAY STAR FORMATION STORY AS TOLD BY LYMAN BREAK GALAXIES IN THE 4 Ms CDF-S

摘要: We present results from deep X-ray stacking of {gt}4000 high-redshift galaxies z {ap} 1 to 8 using the 4 Ms Chandra Deep Field-South data, deepest survey extragalactic sky date. The galaxy samples were selected Lyman break technique based primarily on recent Hubble Space Telescope ACS and WFC3 observations. Based such high specific star formation rates (sSFRs): log SFR/M $_{*}$ {gt} -8.7, we expect that observed properties these (LBGs) are dominated by young stellar populations. emission in LBGs, eliminating individually detected sources (potential active galactic nucleus), is expected be powered binaries hot gas. find, for first time, evidence evolution X-ray/SFR relation. analyses {lt} LBGs (covering ~{}90% universe's history), find 2-10 keV luminosity evolves weakly with redshift (z) SFR as L $_X$ = 0.93log (1 + z) 0.65log 39.80. By comparing our observations sophisticated binary population synthesis models, interpret $_X$/SFR driven metallicity mass binaries, likely dominant sSFR galaxies. also compare models density (total per Mpc$^{3}$) excellent agreement. While there no significant stacked detections at {gt}~{} 5, use upper limits 5 {lt}~{} constrain supermassive black hole accretion history universe around epoch reionization.