The environment of QSOs at the reionization epoch

Details The environment of QSOs at the reionization epoch The environment of QSOs at the reionization epoch

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9777s&link_type=abstract

HST Proposal ID #9777

Computer Science

1

Hst Proposal Id #9777 Cosmology

Scientific paper

Our goal is to elucidate the role of QSOs and galaxies at the tail end of reionization by identifying z 6 galaxies near SDSS z>6 QSOs through their red i-z colors. A similar technique was used by the SDSS to identify the QSOs themselves. Based on our understanding of the growth of structure in the Universe and on observations at z = 4, we expect z 6 QSOs to be associated to the high peaks in the matter density distribution. Therefore, they should be surrounded by an excess of objects - as compared to random fields - unless the ionizing radiation from the QSOs themselves is inhibiting star formation. We will concentrate on 5 QSOs discovered by the SDSS at z> 6 and spend 7 orbits with ACS on each of the QSO fields {2.5 in F775W - i - and 4.5 in F850LP - z}, for a total of 35 orbits. The exposures are optimized for the detection of objects with i-z> 2. The reference properties of the field population will be provided by GOODS which is reaching the same depth. The proposed observations will be capable of revealing the dominant effect between galaxy suppression by the QSO ionizing flux and number density excess due to clustering. We will test whether the balance between suppression and enhancement evolves with redshift. We will also be able to estimate for these fields the ionizing continuum contribution by galaxies and compare it with that of the QSOs. If galaxies are found to be comparably important to QSOs in these selected fields, the idea that hydrogen reionization is primarily due to stellar radiation would be significantly strengthened.

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