2012A&A...542A.123S -
Astronomy and Astrophysics, volume 542A, 123-123 (2012/6-1)
The evolution of the X-ray emission of HH 2. Investigating heating and cooling processes.
SCHNEIDER P.C., GUENTHER H.M. and SCHMITT J.H.M.M.
Abstract (from CDS):
Young stellar objects often drive powerful bipolar outflows, which evolve on timescales of a few years. An increasing number of these outflows has been detected in X-rays implying the existence of million degree plasma almost co-spatial with the lower temperature gas observed in the optical and near-infrared. The details of the heating and cooling processes of the X-ray emitting part of these so-called Herbig-Haro objects are still ambiguous, e.g., whether the cooling is dominated by expansion, radiation, or thermal conduction. We present a second epoch Chandra observation of the first X-ray detected Herbig-Haro object (HH 2) and derive the proper-motion of the X-ray emitting plasma and its cooling history. We argue that the most likely explanation for the constancy of the X-ray luminosity, the alignment with the optical emission and the proper-motion is that the cooling is dominated by radiative losses leading to cooling times exceeding a decade. We explain that a strong shock caused by fast material ramming into slower gas in front of it about ten years ago can explain the X-ray emission while being compatible with the available multi-wavelength data of HH 2.
Abstract Copyright:
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Journal keyword(s):
Herbig-Haro objects - ISM: jets and outflows - ISM: individual objects: HH 2 - X-rays: ISM - stars: winds, outflows
Simbad objects:
8
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