Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.1703w&link_type=abstract
American Astronomical Society, HEAD meeting #11, #17.03; Bulletin of the American Astronomical Society, Vol. 41, p.683
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on an XMM-Newton survey of the L1641 region, covering 3.5°x0.5°, just south of the Orion Nebular Cluster. Stars in the early stages of their formation are characterized by strong IR excess and X-rays emission. This survey is a companion to a 3.6-24μm survey of the same region using Spitzer. We observed 7 XMM-Newton fields specifically for this program and are augmenting the X-ray data with XMM-Newton archival data on the region surrounding the ONC including OMC 2/3, ι Ori, L1641N, V833 Ori and V1118 Ori). The full survey, plus archival data, constitute an essentially complete XMM-Newton survey of the Orion A cloud. Through Spitzer we detect over 600 Class I and Class II sources in L1641. From XMM-Newton we identify about 702 PMS stars (Class I, II and III) that emit in X-rays out of a total of 1060 X-ray sources. If we assume the same fraction of X-ray detection for Class III objects and Class III objects we estimate a population comprised between 1800 and 2100 PMS stars. Thus, similar in size to Orion Nebular Cluster -- though without any massive stars. From X-ray spectra we find that plasma temperatures and absorption values decrease from Protostars to CTT stars to WTT stars. Some differences of Lx distributions for the same type of PMS stars are visible in different parts of the surveyed region. Clustering properties and spatial segregation among different PMS stages appear to track the formation history.
This work is supported by NASA contract NAS8-03060 and through the XMM guest investigator program supported this work through grant NNX07AU35G.
Allen Lew
Megeath Thomas S.
Pillitteri Ignazio
SOXS Consortium
Wolk Scott J.
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