SIMBAD references

2001ApJ...554..734T - Astrophys. J., 554, 734-741 (2001/June-3)

Discovery of X-rays from class 0 protostar candidates in OMC-3.


Abstract (from CDS):

We have observed the Orion Molecular Clouds 2 and 3 (OMC-2 and OMC-3) with the Chandra X-Ray Observatory (CXO). The northern part of OMC-3 is found to be particularly rich in new X-ray features; four hard X-ray sources are located in and along the filament of cloud cores. Two sources coincide positionally with the submillimeter-millimeter dust condensations of MMS 2 and 3 or an outflow radio source VLA 1, which are in a very early phase of star formation. The X-ray spectra of these sources show an absorption column of (1-3)x1023–2. Assuming a moderate temperature plasma, the X-ray luminosity in the 0.5-10 keV band is estimated to be ∼1030 ergs.s–1 at a distance of 450 pc. From the large absorption, positional coincidence, and moderate luminosity, we infer that the hard X-rays are coming from very young stellar objects embedded in the molecular cloud cores.We found another hard X-ray source near the edge of the dust filament. The extremely high absorption of 3x1023–2 indicates that the source must be surrounded by dense gas, suggesting that it is either a young stellar object in an early accretion phase or a Type II AGN (e.g., a Seyfert 2), although no counterpart is found at any other wavelength. In contrast to the hard X-ray sources, soft X-ray sources are found spread around the dust filaments, most of which are identified with IR sources in the T Tauri phase.

Abstract Copyright:

Journal keyword(s): ISM: individual (OMC-2, OMC-3) - Stars: Coronae - Stars: Flare - Stars: Late-Type - Stars: Pre-Main-Sequence - X-Rays: Stars

Nomenclature: Table 1, Fig.1: [TKH2001] NN (Nos 1-13), [TKH2001] a (Nos a-c).

CDS comments: p. 740: H2 flow B and D from 1997ApJ...485L..45Y not in SIMBAD.

Simbad objects: 21

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