Probing the Voids

Details Probing the Voids Probing the Voids

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2717s&link_type=abstract

HST Proposal ID #2717

Computer Science

Hst Proposal Id #2717

Scientific paper

We propose to use the HST + FOS to verify and characterize absorption systems at the positions and velocities of cosmic voids discovered in IUE archive spectra of very bright QSOs. For the last two yers we have been re-extracting and co-adding spectra of over 200 QSOs and Seyferts whose sight-lines penetrate the nearby, well-defined voids in the directions of Coma, Bootes, Perseus-Pisces and Hercules. We propose to observe only our 4 best candidates. The purpose of this investigation is to detect hot and/or cold gas associated with the voids and eventually how they were formed. At first sight using the low resolution and SNR spectra obtained with IUE for such a project seems difficult at best. But the UV absorption lines accessible to IUE (and to HST) are often over a factor of 10 stronger than their optical counterparts (CaII and NaI) making IUE competitive with large ground-based reflectors for this purpose (see our examples in the scientific justification section).

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