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An X-Ray Survey of the Young Stellar Population of the Lynds 1641 and Iota Orionis Regions

Pillitteri, I. and Wolk, S. J. and Megeath, S. T. and Allen, L. and Bally, J. and Gagné, M. and Gutermuth, R. A. and Hartmann, L. and Micela, G. and Myers, P. and Oliveira, J. M. and Sciortino, S. and Walter, F. and Rebull, L. and Stauffer, J. (2013) An X-Ray Survey of the Young Stellar Population of the Lynds 1641 and Iota Orionis Regions. Astrophysical Journal, 768 (2). Art. No. 99. ISSN 0004-637X.

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We present an XMM-Newton survey of the part of the Orion A cloud south of the Orion Nebula. This survey includes the Lynds 1641 (L1641) dark cloud, a region of the Orion A cloud with very few massive stars and hence a relatively low ambient UV flux, and the region around the O9 III star ι Orionis. In addition to proprietary data, we used archival XMM data of the Orion Nebula Cluster (ONC) to extend our analysis to a major fraction of the Orion A cloud. We have detected 1060 X-ray sources in L1641 and the ι Ori region. About 94% of the sources have Two Micron All Sky Survey and Spitzer counterparts, 204 and 23 being Class II and Class I or protostar objects, respectively. In addition, we have identified 489 X-ray sources as counterparts to Class III candidates, given they are bright in X-rays and appear as normal photospheres at mid-IR wavelengths. The remaining 205 X-ray sources are likely distant active galactic nuclei or other galactic sources not related to Orion A. We find that Class III candidates appear more concentrated in two main clusters in L1641. The first cluster of Class III stars is found toward the northern part of L1641, concentrated around ι Ori. The stars in this cluster are more evolved than those in the Orion Nebula. We estimate a distance of 300-320 pc for this cluster showing that it is in the foreground of the Orion A cloud. Another cluster rich in Class III stars is located in L1641 South and appears to be a slightly older cluster embedded in the Orion A cloud. Furthermore, other evolved Class III stars are found north of the ONC toward NGC 1977.

Item Type:Article
Related URLs:
URLURL TypeDescription
Wolk, S. J.0000-0002-0826-9261
Megeath, S. T.0000-0001-7629-3573
Bally, J.0000-0001-8135-6612
Gutermuth, R. A.0000-0002-6447-899X
Hartmann, L.0000-0003-1430-8519
Micela, G.0000-0002-9900-4751
Walter, F.0000-0003-4793-7880
Rebull, L.0000-0001-6381-515X
Stauffer, J.0000-0003-3595-7382
Additional Information:© 2013 American Astronomical Society. Received 2012 October 24; accepted 2013 March 15; published 2013 April 18. The XMM-Newton guest investigator program supported I.P. through grant NNX09AP46G. S.J.W. was supported by NASA contract NAS8-03060 to the Chandra Science Center. This work is based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA, and in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. Facilities: XMM (EPIC), Spitzer (IRAC, MIPS).
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:stars: formation; stars: individual (Orion A, L1641, Iota Orionis, V380 Ori, V883 Ori)
Issue or Number:2
Record Number:CaltechAUTHORS:20130604-133947018
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Official Citation:An X-Ray Survey of the Young Stellar Population of the Lynds 1641 and Iota Orionis Regions I. Pillitteri, S. J. Wolk, S. T. Megeath, L. Allen, J. Bally, M. Gagné, R. A. Gutermuth, L. Hartman, G. Micela, P. Myers, J. M. Oliveira, S. Sciortino, F. Walter, L. Rebull, and J. Stauffer doi:10.1088/0004-637X/768/2/99
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:38786
Deposited By: Ruth Sustaita
Deposited On:04 Jun 2013 21:03
Last Modified:14 Nov 2019 00:21

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