STIS Observations of HeII Gunn-Peterson Absorption Toward HE 2347-4342

Details STIS Observations of HeII Gunn-Peterson Absorption Toward HE 2347-4342 STIS Observations of HeII Gunn-Peterson Absorption Toward HE 2347-4342

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.5205s&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #52.05; Bulletin of the American Astronomical Society, Vol. 31, p.1452

Astronomy and Astrophysics

Astronomy

Scientific paper

We present new HST-STIS spectra of the z = 2.885 quasar HE 2347--4342 which allow to study the HeII Gunn-Peterson absorption in the redshift range 2.769 < z < 2.885. Thanks to complementary Keck-HIRES spectra of the HI Ly-α forest, we provide new constraints on the softness and fluctuations of the UV background. We also present a model for the observed HeII opacity gaps. This research was supported by NASA through funding by the STIS IDT.

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