Broad helium emission in the galactic center

Details Broad helium emission in the galactic center Broad helium emission in the galactic center

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260l..53h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 260, Sept. 15, 1982, p. L53-L57. Research supported by the Guggenhei

Astronomy and Astrophysics

Astrophysics

80

Emission Spectra, Galactic Nuclei, Helium, Infrared Spectra, Milky Way Galaxy, Abundance, Gas Flow, Line Spectra, Spectral Energy Distribution, Spectrum Analysis

Scientific paper

An infrared (K band) spectrum taken with a 3.8 arcsec-diameter aperture centered on the galactic center source IRS 16 exhibits weak CO band absorption and emission by hydrogen Brackett-gamma (Br gamma) and a singlet helium line near 4857/cm. The helium emission profile is much broader (FWHM about 1500 + or - 300 km/sec) than any feature seen previously at the galactic center. The broadening is probably due to Doppler motion of gas either flowing through an ionizing layer or orbiting about a massive object. The absence of hydrogen Br gamma emission with a similar profile suggests the galactic center H/He abundance ratio is reduced by a factor greater than about 500 from normal cosmic values.

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