Strong Lyman Alpha Sources at Redshifts Z>4: Galaxies or Quasars?

Details Strong Lyman Alpha Sources at Redshifts Z>4: Galaxies or Quasars? Strong Lyman Alpha Sources at Redshifts Z>4: Galaxies or Quasars?

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop..952m&link_type=abstract

Chandra Proposal ID #03700814

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Chandra Proposal Id #03700814

Scientific paper

Strong Lyman Alpha line emission is expected both from primordial galaxies and from the type II quasars required to explain the hard x-ray background. We have identified ~200 Lyman alpha emitting candidates at redshifts 4.5 and 5.7. Of these, 60% show rest equivalent widths EW>200 Angstroms, which require active nuclei, or extreme populations of massive stars. Our Lyman Alpha survey is a unique resource for determining the space density of type II quasars efficiently. X-ray imaging with Chandra ACIS will determine the fraction of type II quasars among the Lyman alpha sources. This has 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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