The Gould's Belt Distances Survey (GOBELINS) II. Distances and structure towards the Orion Molecular Clouds

astro-ph.SR

/ Authors

Marina Kounkel, Lee Hartmann, Laurent Loinard, Gisela N. Ortiz-León, Amy J. Mioduszewski, Luis F. Rodríguez, Sergio A. Dzib, Rosa M. Torres, Gerardo Pech, Phillip A. B. Galli

and 5 more authors

Juana L. Rivera, Andrew F. Boden, Neal J. Evans, Cesar Briceño, John J. Tobin

/ Abstract

We present the results of the Gould's Belt Distances Survey (GOBELINS) of young star forming regions towards the Orion Molecular Cloud Complex. We detected 36 YSOs with the Very Large Baseline Array (VLBA), 27 of which have been observed in at least 3 epochs over the course of 2 years. At least half of these YSOs belong to multiple systems. We obtained parallax and proper motions towards these stars to study the structure and kinematics of the Complex. We measured a distance of 388$\pm$5 pc towards the Orion Nebula Cluster, 428$\pm$10 pc towards the southern portion L1641, 388$\pm$10 pc towards NGC 2068, and roughly $\sim$420 pc towards NGC 2024. Finally, we observed a strong degree of plasma radio scattering towards $λ$ Ori.