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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, 61 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
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