Magnetism and Activity of the Sun and Stars
J. Arnaud and N. Meunier (eds)
EAS Publications Series, Vol. 9, 2003
DOI: 10.1051/eas:2003121

XMM-Newton observation of Oph dark cloud

H. Ozawa¹, T. Montmerle¹ and N. Grosso<sup>2

1</sup>  Service d'Astrophysique, Centre d'Études de Saclay, France Current address: Laboratoire d'Astrophysique de Grenoble, France
²  Max-Planck-Institut für extraterrestrische Physik, Garching bei München, Germany Current address: Laboratoire d'Astrophysique de Grenoble, France

Abstract
We observed the Ophiuchi dark cloud around core F, an active star-forming region, with the XMM-Newton observatory for 30 ks. We detected 107 X-ray sources within the 30' diameter field-of-view of the XMM-Newton observatory. We compared the positions of the XMM-Newton X-ray sources with the Chandra X-ray sources and found 43 X-ray sources detected with both satellites. We had a high rate of X-ray detection of Class I protostars of ~70%. We extracted light curves and spectra from bright 4 Class I sources, YLW16A, EL29, YLW15, and IRS51. They did not show X-ray flare during the observation time of 30 ks. Their X-ray spectra showed high temperature and heavy absorption, which is typical for Class I protostars.

© EAS, EDP Sciences 2003

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