We have obtained a high signal-to-noise (30 <= S/N <= 70) high resolution (FWHM = 20 km s(-1) ) spectrum of the QSO HS 1700+6416 (z_em = 2.72). In this poster we summarize our analysis of the extragalactic heavy element absorption lines detected in this spectrum. Profile fitting indicates that four of the C IV systems are narrow with b < 8 km s(-1) . This implies that T < 50000 K, and therefore these systems are probably photoionized. Photoionization modeling of the Lyman limit system at z_abs = 2.315 indicates that this system has a relatively high metallicity, Z >= 0.2Zsun, but some dust depletion must be invoked to understand the relative metal abundances. Curiously, the complex of C IV absorption lines at 2.432 < z_abs < 2.441 shows the weak line of one C IV absorber aligned to within 10 km s(-1) with the strong line of a different C IV doublet for two pairs of C IV absorbers. This is reminiscent of the ``line-locked'' absorption systems detected in associated and broad absorption line systems, and radiative acceleration may play a role. This is somewhat surprising since this absorption complex is shifted by more than 20000 km s(-1) away from the emission redshift. Finally, we apply photoionization modeling to the associated metal system at z_abs = 2.7125, which shows rather strong N V absorption.
American Astronomical Society Meeting Abstracts #188
- Pub Date:
- May 1996