EXIST: Deep Hard X-ray Imaging Survey for Black Holes

Details EXIST: Deep Hard X-ray Imaging Survey for Black Holes EXIST: Deep Hard X-ray Imaging Survey for Black Holes

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aps..apr.r4004g&link_type=abstract

American Physical Society, April Meeting, 2003, April 5-8, 2003 Philadelphia, Pennsylvania, MEETING ID: APR03, abstract #R4.004

Astronomy and Astrophysics

Astrophysics

Scientific paper

We describe the proposed Energetic X-ray Imaging Survey Telescope (EXIST), a candidate mission concept for the ``Einstein Probe" mission ``Black Hole Finder" as described in the recent NASA Roadmap and Strategic Plan for future missions in the Structure and Evolution of the Universe theme of Space Science at NASA. EXIST is a very large area (8m^2) array of imaging Cd-Zn-Te (CZT) detectors that would image the sky through a coded aperture mask. The detectors view a large field of view, with fully-coded imaging over a 180deg x 75deg field from the combined fields of 3 large telescopes. By orienting this fan-beam perpendicular to the orbital ram direction, and maintaining zenith pointing, the full sky is imaged every 95min orbit. The detectors and telescopes are designed to achieve a survey sensitivity of ˜0.05mCrab ( ˜5 x 10-13 erg/cm^2-sec) over the 10-150 keV band, or comparable to the soft x-ray (0.2-2.5keV) all-sky survey sensitivity achieved with ROSAT, and a factor of ˜10-100 more sensitive than any other hard x-ray sky survey. At energies ˜150-600 keV, EXIST would achieve survey sensitivity of ˜0.5mCrab, or ˜100-1000 times the sensitivity of the only previous full sky survey (HEAO-1) in this energy range. EXIST science is concentrated on black holes, from x-ray binaries and gamma-ray bursts to supermassive black holes in galactic nuclei. It would obtain the first full-sky census of accreting black holes that are obscured in galactic nuclei in the local universe as well as high luminosity, but obscured, accreting black holes (Type 2 quasars) in the more distant universe to constrain the relative luminosity from accretion vs. nuclear burning. The full-sky coverage every 95min allows a temporal survey for black holes (as well as neutron stars and other high energy sources) unique in its spectral-temporal coverage which can constrain the physics and astrophysics of black holes on a variety of scales.A broad overview of the EXIST science and mission concept will be presented.

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