Newly Proposed To EXIST: Full-sky AGN And High-z GRB Survey With Redshifts

Details Newly Proposed To EXIST: Full-sky AGN And High-z GRB Survey With Redshifts Newly Proposed To EXIST: Full-sky AGN And High-z GRB Survey With Redshifts

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.3705g&link_type=abstract

American Astronomical Society, HEAD meeting #10, #37.05

Physics

Optics

Scientific paper

A new concept for the Energetic X-ray Imaging Survey Telescope (EXIST) has been proposed (for AMCS) as the Black Hole Finder Probe. Its primary science goals remain a full-sky survey for obscured AGN to further constrain the accretion luminosity of the Universe, and an "ultimate sensitivity" survey for Gamma-ray Bursts (GRBs) to both understand the birth of black holes as well as to use GRBs as cosmic probes of the high redshift Universe. By reducing total field of view, but preserving total area ( 4.7m2) of imaging CZT in the (7-600 keV) High Energy Telescope (HET), higher sensitivity and angular resolution are achieved with a 50% reduction in total payload mass and mission volume. This allows the addition of a secondary instrument: a low-cost 1.1m aperture IR telescope (IRT), with imaging and objective prism (or slit grism) spectroscopy simultaneously (with dichroic) in the optical (0.25-1.0μm) and IR (0.9 - 2.5 μm). Rapid slews ( 100sec) to <10" positions (90%) measured for GRBs and AGN by the HET will allow optical-IR prompt IDs and redshifts from resolution R 15 spectra of all objects in the 5’ FoV of the IRT and then R 1500 spectra for studies of the epoch of reionization of GRBs at z >7. By radiatively cooling (-30C) the IRT optics, R 15 spectra at H 24 in 1000sec exposures are obtained, sufficient to measure redshifts of GRBs 8mag fainter than GRB050904 at z = 6.3. After the first 2y of full-sky scanning (with 2-3 GRBs and redshifts per day) to catalog 50,000 AGN, the mission would be predominantly pointed (but still slew to GRBs) to measure redshifts and hard X-ray spectra and variability of a significant fraction of the AGN sample. An overview of the mission science and concept will be described.

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