We present a \approx 20 ks Chandra ACIS-S observation of the strongly lensed z = 2.285 ultra-luminous infrared galaxy FSC 10214+4724 .
Although this observation achieves the equivalent sensitivity of an up-to \approx 4 Ms Chandra exposure ( when corrected for gravitational lensing ) , the rest-frame 1.6–26.3 keV emission from FSC 10214+4724 is weak ( L _ { X } \approx 2 \times 10 ^ { 42 } erg s ^ { -1 } for a lensing boost of \approx 100 ) ; a significant fraction of this X-ray emission appears to be due to vigorous star-formation activity .
If FSC 10214+4724 hosts a quasar , as previously suggested , then it must be obscured by Compton-thick material .
We compare FSC 10214+4724 to high-redshift SCUBA galaxies and discuss the X-ray identification of Compton-thick AGNs at high redshift .