A Chandra Census of C2D YSOS: Evolution of X-ray Emission

(2) University of Illinois at Urbana-Champaign); L.W. Looney (2) ((1) USRA-NASA Ames Research Center; M. Hamidouche (1); M. Jacobson (2)

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A Chandra Census of C2D YSOS: Evolution of X-ray Emission

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arxiv 1010.0724 v1 pith:NEHW4X3I submitted 2010-10-04 astro-ph.SR

M. Hamidouche (1) , M. Jacobson (2) , L.W. Looney (2) ((1) USRA-NASA Ames Research Center , (2) University of Illinois at Urbana-Champaign) This is my paper · ORCID

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keywords x-raydetectedaccretionenergyobjectsx-raysactivityages

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We present an analytical study of a large sample of ~109 young stellar objects in the X-ray. Our objects were detected in X-ray independent of age. Unexpectedly, the X-ray energy is somewhat correlated with the ages. It decreases with time and with column density, while it should increase. We conclude that the youngest protostars, Class 0/I, emit X-rays in the 1-8 keV band. The deeply embedded sources with the strongest accretion activity are detected in the hard-band (> 2keV) only. Due to extinction, their soft X-rays are not detected. To explain the decline in energy, we suggest that within a timescale of few Myrs the corona cools down via the accretion material.

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