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2001ApJ...557..747I - Astrophys. J., 557, 747-760 (2001/August-3)

Chandra observation of the ρ Ophiuchi cloud.


Abstract (from CDS):

We observed a 17'x17' region of the ρ Oph molecular cloud, using the ACIS-I array on board the Chandra X-Ray Observatory. A 100 ks exposure observation revealed ∼100 X-ray sources above the detection limit of ∼1028 ergs.s–1. About two-thirds of the X-ray sources are identified with an optical and/or IR counterpart, including significant numbers of class I, II, and III sources and a few brown dwarfs. The X-ray detection rate of class I sources is a surprisingly high 70%. Many X-ray flares, possibly because of the magnetic activity, are found from all of the classes. We make systematic spectral studies of the quiescent and flare X-rays for all the X-ray sources. The X-ray temperatures and absorptions of class I sources are generally larger than those of class II and III sources. In addition, X-ray flares from class I sources show slightly higher duty ratio, temperature, and luminosity than those of more evolved classes. We further give brief results on brown dwarfs, sources in a younger phase than class I, unclassified, and unidentified sources. Details for several selected young stellar objects, including the first detection of a neutral iron line (6.4 keV) from a class I source (YLW 16A), are separately addressed.

Abstract Copyright:

Journal keyword(s): ISM: Clouds - ISM: Individual: Name: ρ Ophiuchi Cloud - Stars: Formation - Stars: Pre-Main-Sequence - X-Rays: Stars

Nomenclature: Table 1: [IKT2001] NN (Nos 1-87).

Errata: erratum vol. 579, p. 920 (2002)

Simbad objects: 90

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