The NEXT mission

Details The NEXT mission The NEXT mission

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2820m&link_type=abstract

American Astronomical Society, HEAD meeting #10, #28.20

Physics

Optics

Scientific paper

The New Exploration X-Ray Telescope (NEXT), the new Japanese X-ray Astronomy Satellite following Suzaku, is a combination of wide band X-ray spectroscopy (3-80 keV) provided by multi-layer coating, focusing hard X-ray mirrors (HXT) and pixel detectors (HXI), and high energy- resolution soft X-ray spectroscopy (0.3-10 keV) provided by thin-foil X-ray optics (SXT) and a microcalorimeter array (SXS). The mission will carry other two instruments. The SXT-SXS system will be developed by international collaboration lead by ISAS/JAXA and NASA.
The SXS will use a 6x6 format microcalorimeter array. The energy resolution is expected to be better than 7 eV. The field of view and the effective area will be, respectively, about 3 arc minutes and about 220 cm2 combined with the 6 m focal-length SXT. The focal length of the HXI will be 12 m and the effective area will be larger than 200 cm2 at 50 keV. The HXI utilizes a Si micro strip detector overlaid on a CdTe pixel detector with a BGO active shield. The extremely low background of the HXT-HXI system will improve the sensitivity in 20-50 keV range by almost two orders of magnitude, compared to conventional non-imaging detectors. Search for highly absorbed active galactic nuclei and understanding their evolution will be one of the main science of the HXT-HXI. The SXT-SXS system will study distant clusters up to redshift of about 1. Both the accurate measurements of the temperature and the turbulence/ macroscopic motions of the ICM will probe the evolution of the ICM, hence the formation history of the large scale structure of the universe, which will eventually constrain the evolution of the dark energy. The mission is now in the phase-A development and recognized as a pre-project in JAXA. We expect to start the phase-B development in this year and launch in 2013.

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