The X-ray emission from Young Stellar Objects in the ρ Ophiuchi dark cloud as seen by XMM-Newton

Details The X-ray emission from Young Stellar Objects in the ρ Ophiuchi dark cloud as seen by XMM-Newton The X-ray emission from Young Stellar Objects in the ρ Ophiuchi dark cloud as seen by XMM-Newton

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..259o&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Astronomy and Astrophysics

Astrophysics

Scientific paper

We observed the dense core F of the rho Ophiuchi dark cloud, an active star-forming region located at ~140 pc, with the XMM-Newton Observatory with an exposure of 33 ks. We detect 87 X-ray sources within the 30' diameter field-of-view of XMM-Newton. We compared the positions of XMM-Newton X-ray sources with previous X-ray and infrared (IR) catalogs: 25 new X-ray sources are found from our observation; 43 X-ray sources are detected with both the XMM-Newton and Chandra observatories; 68 XMM-Newton X-ray sources have near-IR counterparts from comparison with 2MASS catalog. We show that XMM-Newton and Chandra have comparable sensitivity for point source detection when the exposure tie is identical. We detect X-ray emission from 7 Class I sources, 26 Class II sources, and 17 Class III sources. The X-ray detection rate of Class I sources is very high (64 %), which is consistent with previous Chandra results on this area. We show that 15 X-ray sources are new class III candidates, which contributes to the census of YSOs. We also detect X-ray emission from two bona fide brown dwarfs, GY310 and GY141, out of 3. We extracted X-ray light curves and spectra from these YSOs, and find some of them showed weak X-ray flares.

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