A Ghanian national in the country illegally who is charged with raping a woman in his Uber car before absconding to his native country was placed on an immigration detainer following his arrest, federal authorities said.Frederick Q. Amfo, 30, who lived in Quincy, was arraigned Friday for the alleged rape of Emily Murray during the early morning hours of April 8.Amfo was released from custody after posting $10,000 bail.