Physics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011noao.prop..449w&link_type=abstract
NOAO Proposal ID #2011A-0449
Physics
Scientific paper
We will exploit the large field of view of the MOSAIC camera on the KPNO 4-m telescope to conduct a census of foreground QSOs in the fields of six rare far UV transmitting QSO sightlines useful for studying He II reionization. Deep multicolor imaging will allow us to photometrically select the faint foreground QSOs responsible for doubly ionizing helium at z~ 3. By directly linking features in (background) He II transmission spectra with the (foreground) ionizing sources, we will answer fundamental questions about reionization, QSOs, and the physical state of the IGM. Our background He II QSOs have just recently been confirmed to display He II absorption along their sightlines. Science-grade HST/COS spectra of them either exist already, or they are scheduled to be taken in May 2011. A dedicated QSO survey in the vicinity of these rare sightlines is required to fully interpret the strongly fluctuating He II absorption near the He II reionization epoch. Our observations will assess the morphology of He II reionization and constrain numerical models thereof. Directly identifying the QSOs that completed helium reionization is the obvious next step in He II reionization studies in the HST/COS era.
Dall'Aglio Aldo
Hennawi Joseph
McQuinn Matthew
Worseck Gabor
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