Discovery of Extremely Embedded X-ray Sources in the R Coronae Australis Star Forming Core

Details Discovery of Extremely Embedded X-ray Sources in the R Coronae Australis Star Forming Core Discovery of Extremely Embedded X-ray Sources in the R Coronae Australis Star Forming Core

2005-03-02

arxiv.org/abs/astro-ph/0503029v1

Astrophys.J. 623 (2005) 291-301

Astronomy and Astrophysics

Astrophysics

26 pages, 8 figures, To be published in ApJ in April 2005

Scientific paper

10.1086/428434

With the XMM-Newton and Chandra observatories, we detected two extremely embedded X-ray sources in the R Corona Australis (R CrA) star forming core, near IRS 7. These sources, designated as XB and XA, have X-ray absorption columns of ~3e23 cm-2 equivalent to AV ~180 mag. They are associated with the VLA centimeter radio sources 10E and 10W, respectively. XA is the counterpart of the near-infrared source IRS 7, whereas XB has no K-band counterpart above 19.4 mag. This indicates that XB is younger than typical Class I protostars, probably a Class 0 protostar or in an intermediate phase between Class 0 and Class I. The X-ray luminosity of XB varied between 29

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