Computer Science
Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5959t&link_type=abstract
HST Proposal ID #5959
Computer Science
Hst Proposal Id #5959 Qso Absorption Lines
Scientific paper
Jakobsen et al 1994 have claimed the first detection of Gunn-Peterson absorption by He II in the diffuse intergalacticmedium (IGM). Although likely, they are not certain that theabsorption is from the IGM, and they are unsure how much ofthe absorption is due to He II in individual LymanAlphaclouds which are completely unresolved in their objectiveprism spectrum with 25 Angstrom resolution.We will obtain spectra of one QSOs with three goals.(1) The spectrum of the QSO will have SNR=10 per 0.57Angstrom,which is enough that we can separate out absorption due to HeII in LyAlpha forest lines and diffuse IGM absorption. Weshould be able to measure Tau _GP, which gives part of thespectrum of the ionizing radiation. (2) We will have thespectral resolution and SNR to see that the GP absorption doesnot begin for some distance away from the QSO, because itis surrounded by a Stromgren sphere of high ionization.The extent of this sphere depends on the intensity and shapeof the spectra of ionizing radiation, both from the QSOs andin the IGM in general. (3) If the sources of energyfor the re-ionization of the IGM were relatively scarce (majorexplosions, QSOs) the IGM will not all be of the sameionization, and we should see less GP absorption in someplaces in the spectrum.
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