STIS Spectroscopy of Q0302-003: The HeII Gunn Peterson Effect

Details STIS Spectroscopy of Q0302-003: The HeII Gunn Peterson Effect STIS Spectroscopy of Q0302-003: The HeII Gunn Peterson Effect

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.0404h&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #04.04; Bulletin of the American Astronomical Society, Vol. 30, p.1248

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new far-UV spectrum of the z=3.29 QSO, Q0302-003, obtained by STIS. This spectrum traces redshifted HeII Lyman-alpha lambda 304 absorption over a redshift range, z=2.8 - 3.28, at a resolution of Delta lambda =1 Angstroms. In agreement with previous observations by the FOC (Jakobsen et al. 1994) and the GHRS (Hogan et al. 1997), the STIS spectrum clearly shows the ``Gunn-Peterson absorption trough'' formed by redshifted HeII Lyman-alpha . The STIS spectrum, however, also shows that the HeII opacity is not constant with redshift: there is a hole in the opacity at z=3.05 as well as numerous minor fluctuations in opacity at z<3.05. We will describe the major features of the absorption trough and will compare the observed distribution of opacities with theoretical predictions.

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