MYStIX: Yesterday and Today

Eric FeigelsonPenn State University

ONC/Paradigm for Star Formation STScI Oct 2013 The ONC and the MYStIX Survey

Massive Young Star-Forming Complex Study in Infrared and X-rayOutlineIntroduction: Orion as a template for rich young clustersThe MYStIX Project a very quick introductionComparison of ONC with other clusters

ConclusionONC is a good template for young stellar clusters

The Orion Nebula: Nearest massive star forming regionOrion Nebula ClusterOB-dominated star clusterage ~1-2 MyrBecklin-NeugebauerSmall cluster of protostarsProtoplanetary disks around Orion stars3

Orion Molecular Cloud complex (IRAS 60mm, left)+ molecular filament in Ori A (SCUBA 850 mm, right)20 pc1 pcComplexity on many scales4

Orion Extended Nebulain X-raysGuedel et al. 2008

4-5 Myr1-2 Myr0 MyrAlves & Bouy 2012Multiple star clusters with age gradientChandra Orion Ultradeep Project All pre-main sequence stars are seen in X-rays

6COUP: The Movie PMS stars exhibit high levels of magnetic flaring

COUP: 22 papers Feigelson, Getman, et al. (2005-07)7During the Chandra mission, we increasingly realizedthat X-ray images were useful for improving the census of young stellar populations.

Chandra resolution and FOV is most effective for star forming regions at 0.5