Near-Infrared Spectroscopy of the Compact H II Region W51 IRS 2

Details Near-Infrared Spectroscopy of the Compact H II Region W51 IRS 2 Near-Infrared Spectroscopy of the Compact H II Region W51 IRS 2

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aj....121.2089o&link_type=abstract

The Astronomical Journal, Volume 121, Issue 4, pp. 2089-2094.

Astronomy and Astrophysics

Astronomy

11

Ism: H Ii Regions, Infrared Radiation, Ism: Lines And Bands, Stars: Formation

Scientific paper

Medium-resolution (R~460) spectra in the K window have been obtained for the compact H II regions W51 IRS 2 East and IRS 2 West. Brγ, He I, three lines of [Fe III], and seven lines of molecular hydrogen (H2) have been detected. The unidentified line at 2.288 μm was also detected with ~2% of the intensity of Brγ. We derive an electron density of ~105-106 cm-3 in both IRS 2 East and IRS 2 West from [Fe III] line ratios. In both regions, observed H2 line ratios indicate that the excitation of H2 is dominated by fluorescence rather than by shocks.

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