The Origin of T Tauri X-Ray Emission: New Insights from the Chandra Orion Ultradeep Project - Preibisch, Thomas; Kim, Yong-Cheol; Favata, Fabio; Feigelson, Eric D; Flaccomio, Ettore; Getman, Konstantin; Micela, Giusi; Sciortino, Salvatore; Stassun, Keivan; Stelzer, Beate; Zinnecker, Hans (The Astrophysical journal. Supplement series, 2005)