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2002ApJ...575..291H - Astrophys. J., 575, 291-305 (2002/August-2)

Molecular hydrogen outflows in W51.


Abstract (from CDS):

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 narrowband 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 [Fe II]. 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 [Fe II] line and in Brγ. The largest and best-studied outflow shock front shows a remarkably broad [Fe II] 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 preshock material is used to explain these spectra.

Abstract Copyright:

Journal keyword(s): Infrared: ISM - ISM: Jets and Outflows - ISM: Lines and Bands - ISM: Molecules - Stars: Formation - Stars: Pre-Main-Sequence

Nomenclature: Fig.2: W51H2 JHHMMSS.s+DDMMSS N=14. Fig.5: W51H2 J192323.6+142515 WA (Nos N, C, S, SA-SC). Fig.7: W51H2 J192339.7+143131 A (Nos A-C).

Simbad objects: 36

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