Type II Quasars among Z>4 Strong Lyman Alpha Sources

Details Type II Quasars among Z>4 Strong Lyman Alpha Sources Type II Quasars among Z>4 Strong Lyman Alpha Sources

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002cxo..prop.1290m&link_type=abstract

Chandra Proposal ID #04700805

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Chandra Proposal Id #04700805

Scientific paper

Strong Lyman-alpha emission is expected both from primordial galaxies and from the type II quasars required to explain the hard x-ray background. We have identified ~300 Ly-alpha sources at redshifts 4.5 and 5.7. About 60% of these show rest equivalent widths >200 Angstrom, which requires active nuclei, or extreme populations of massive stars. Our Ly-alpha survey (LALA) is a unique resource for determining the space density of type II quasars at high z efficiently. The large fields of ACIS and LALA will allow us to observe 60 ly-alpha emitters, including the brightest narrow line Ly-alpha emitter with EW=660. This will have implications for composition of the X-ray background, background radiation at other wavelengths, and structure formation (stars vs black holes) in the early universe.

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