Chandra X-ray Observation of the Orion Nebula Cluster. I Detection, Identification and Determination of X-ray Luminosities

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dc.creatorFlaccomio, E.
dc.creatorDamiani, F.
dc.creatorMicela, G.
dc.creatorSciortino, S.
dc.creatorHarnden Jr., F. R.
dc.creatorMurray, S. S.
dc.creatorWolk, S. J.
dc.date2002-08-27
dc.date.accessioned2026-07-07T11:46:01Z
dc.date.available2026-07-07T11:46:01Z
dc.descriptionIn this first of two companion papers on the Orion Nebula Cluster (ONC), we present our analysis of a 63 Ksec Chandra HRC-I observation that yielded 742 X-ray detections within the 30'x30' field of view. To facilitate our interpretation of the X-ray image, here we collect a multi-wavelength catalog of nearly 2900 known objects in the region by combining 17 different catalogs from the recent literature. We define two reference groups: an infrared sample, containing all objects detected in the K band, and an optical sample comprising low extinction, well characterized ONC members. We show for both samples that field object contamination is generally low. Our X-ray sources are primarily low mass ONC members. The detection rate for optical sample stars increases monotonically with stellar mass from zero at the brown dwarf limit to ~100% for the most massive stars but shows a pronounced dip between 2 and 10 solar masses. We determine L_X and L_X/L_{bol} for all stars in our optical sample and utilize this information in our companion paper to study correlations between X-ray activity and other stellar parameters.
dc.description36 pages, 10 figures; to be published in ApJ; for online tables see http://www.astropa.unipa.it/~ettoref
dc.identifierhttps://arxiv.org/abs/astro-ph/0208474
dc.identifierhttp://arxiv.org/abs/astro-ph/0208474
dc.identifierAstrophys.J.582:382-397,2003
dc.identifierdoi:10.1086/344535
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/202082
dc.subjectAstrophysics
dc.titleChandra X-ray Observation of the Orion Nebula Cluster. I Detection, Identification and Determination of X-ray Luminosities
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