Julius Helgesen i Chicago

I hunt for a Julius Helgesen (b. 1832 in Rygge Norway). He traveled to the United States in 1869 with destination Chicago. His wife, Marte Oline Anonsdatter (born 1828 in Våler Norway) traveled with the same destination in 1870. She is also called Amundsen. They had the children Helge (b. 1864), Maren (b. 1866) and Julia (b. 1869). Are there any traces of them?