Physics – Space Physics
Scientific paper
2011-08-30
Physics
Space Physics
Published in the electronic edition of Astronomy & Astrophysics. It is available on http://dx.doi.org/10.1051/0004-6361/201116
Scientific paper
10.1051/0004-6361/201116554
Our main goal is to derive a new extinction map of the OMC-1, obtaining information about the structure of the OMC-1 and the Orion Nebula Cluster. The most recent near-infrared catalog of stars is used to study the distribution of reddening across a ~0.3 deg^2 area covering the Orion Nebula Cluster. On the basis of the observed (H,H-K_S) diagram, we establish a criterion for disentangling contaminants from bona-fide cluster members. For contaminant stars, interstellar reddenings are estimated by comparison with a synthetic galactic model. A statistical analysis is then performed to consistently account for local extinction, reddening and star-counts analysis. We derive the extinction map of the OMC-1 with angular resolution <5'. We also assemble a sample of candidate cluster members, for which we measure the extinction provided by the nebular environment. These extinction measurements are analyzed similarly to the contaminant sample, and an extinction map of the Orion Nebula is derived. The extinction provided by the OMC-1 is variable on spatial scales of a few arcminutes, while showing a general increase from the outskirts (A_V~6) to the direction of the Trapezium asterism (A_V>30). The Orion Nebula extinction map is more irregular and optically thinner, with A_V of the order of a few magnitudes. Both maps are consistent with the optical morphology, in particular the Dark Bay to the north-east of the Trapezium. Both maps also show the presence of a north-south high-density ridge, which confirms the filamentary structure of the Orion molecular complex inside which star formation is still taking place.
Hillenbrand Lynne
Pagano Isabella
Robberto Massimo
Scandariato Gaetano
No associations
LandOfFree
The extinction map of the OMC-1 molecular cloud behind the Orion Nebula does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The extinction map of the OMC-1 molecular cloud behind the Orion Nebula, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The extinction map of the OMC-1 molecular cloud behind the Orion Nebula will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-728821