High-Resolution Spectroscopy of the Bright Quasar HS 1700+6416

Details High-Resolution Spectroscopy of the Bright Quasar HS 1700+6416 High-Resolution Spectroscopy of the Bright Quasar HS 1700+6416

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448..575r&link_type=abstract

Astrophysical Journal v.448, p.575

Astronomy and Astrophysics

Astronomy

12

Galaxies: Quasars: Absorption Lines, Galaxies: Quasars: Individual Alphanumeric: Hs 1700+6416, Galaxies: Intergalactic Medium

Scientific paper

We have analyzed high-resolution (b ˜ 15 km s-1) optical spectra of the QSO HS 1700+6416 (ζem = 2.72). The high signal-to-noise ratio all across the Lyman alpha forest down to Lyβ at ζ = ζem allows a reasonable determination of the neutral hydrogen column density as well as of the velocity dispersion of the intervening clouds. A weak, but significant, trend for stronger lines to be broader suggests that their column densities (NHI) and Doppler parameters (b) are related. A simplified model of very flattened, highly ionized clouds, gravitationally confined by dark matter, gives a good representation of the data, where the observed NHI-b correlation is due to orientation effects.

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