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Issue A&A
Volume 448, Number 2, March III 2006
Page(s) L29 - L32
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200600004

A&A 448, L29-L32 (2006)
DOI: 10.1051/0004-6361:200600004

Letter

X-rays from HH 210 in the Orion nebula

N. Grosso1, E. D. Feigelson2, K. V. Getman2, J. H. Kastner3, J. Bally4 and M. J. McCaughrean5, 6

1  Laboratoire d'Astrophysique de Grenoble, Université Joseph-Fourier, 38041 Grenoble Cedex 9, France
    e-mail: Nicolas.Grosso@obs.ujf-grenoble.fr
2  Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802, USA
3  Center for Imaging Science, Rochester Institute of Technology, Rochester, New York 14623-5604, USA
4  Center for Astrophysics and Space Astronomy, University of Colorado at Boulder, CB 389, Boulder, CO 80309, USA
5  School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, Devon, UK
6  Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany

(Received 23 November 2005 / Accepted 19 January 2006 )

Abstract
We report the detection during the Chandra Orion Ultradeep Project (COUP) of two soft, constant, and faint X-ray sources associated with the Herbig-Haro object HH 210. HH 210 is located at the tip of the NNE finger of the emission line system bursting out of the BN-KL complex, northwest of the Trapezium cluster in the OMC-1 molecular cloud. Using a recent H$\alpha$ image obtained with the ACS imager on board HST, and taking into account the known proper motions of HH 210 emission knots, we show that the position of the brightest X-ray source, COUP 703 , coincides with the emission knot 154-040a of HH 210, which is the emission knot of HH 210 having the highest tangential velocity (425 km s-1). The second X-ray source, COUP 704 , is located on the complicated emission tail of HH 210 close to an emission line filament and has no obvious optical/infrared counterpart. Spectral fitting indicates for both sources a plasma temperature of ~0.8 MK and absorption-corrected X-ray luminosities of about 1030 erg s-1 (0.5-2.0 keV). These X-ray sources are well explained by a model invoking a fast-moving, radiative bow shock in a neutral medium with a density of ~12 000 cm-3. The X-ray detection of COUP 704 therefore reveals, in the complicated HH 210 region, an energetic shock not yet identified at other wavelengths.


Key words: ISM: Herbig-Haro objects -- ISM: individual objects: HH 210 -- X-rays: ISM

SIMBAD Objects




© ESO 2006


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