ar X iv : a st ro - p h / 02 04 39 5 v 1 2 3 A pr 2 00 2 Molecular Hydrogen Outflows in W 51 Klaus
نویسندگان
چکیده
We present the results of a deep search for the molecular hydrogen shock fronts associated with young stellar outflows in the giant molecular cloud and massive star forming region W51. A total of 14 outflows were identified by comparing images in the H and K bands and in a narrow-band filter centered on the H2 1–0 S(1) line at 2.122 μm. A few of the newly discovered outflows were subsequently imaged at higher spatial resolution in the S(1) filter; one outflow was also imaged in the 1.644 μm emission line of [FeII]. For two of the outflows, high-resolution echelle spectroscopy in the H2 1–0 S(1) line was obtained using NIRSPEC at Keck. For one outflow additional high resolution spectra were obtained in the [FeII] line and in Brγ. The largest and best studied outflow shock front shows a remarkably broad [FeII] line, an unusual high-velocity component in Brγ, and comparably narrow line widths in the H2 1–0 S(1) line. A scenario involving high-velocity shocks and UV excitation of pre-shock material is used to explain these spectra. Subject headings: stars: pre–main-sequence — molecular outflows — embedded clusters — infrared: sources
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