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Session 12 -- Absorption Lines in QSOs

Display presentation, Wednesday, January 12, 9:30-6:45, Salons I/II Room (Crystal Gateway)

[12.05] The HST/FOS Ultraviolet Absorption Spectrum of the QSO PG 1522+101

We present an analysis of the absorption line spectrum of the bright QSO PG 1522+101 (z$_{em}$ = 1.321, V = 15.65, B = 15.8). The data were obtained at a resolution of $\simeq$ 1200, using the high resolution gratings G190H and G270H of the HST FOS. The wavelength coverage of the observations is from $1590$\AA\ to $3300$\AA\ ($685$\AA\ to $1413$\AA\ in the QSO rest frame). The spectrum exhibits high signal to noise (between 20 and 40) for most of the wavelength range covered. \

We identify 98 lines at a significance level of 4.5$\sigma$. Most of lines detected are due to Lyman $\alpha$ forest absorption, but we also detect a significant number of intergalactic metal lines as well as interstellar Milky Way absorption. Our aim is to study the evolution of the Lyman $\alpha$ forest and metal absorption lines. Furthermore, the high galactic latitude of the QSO (b = $50\deg$) makes this line of sight ideal for study of the Galactic Halo. \\

This work is supported by NASA FOS Science Grant NAG5-1630.

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