Mission Instruments on board Astro-E2
The Astro-E carries five soft X-ray telescopes and one hard X-ray
The soft X-ray telescopes (XRT) consists of five X-ray mirrors and
five focal plane detectors, i.e., four X-ray imaging spectrometers
(XIS) and a single high-resolution X-ray spectrometer (XRS). The XIS
is an X-ray CCD camera which covers an energy range of 0.4-10 keV with
a typical energy resolution of 100 eV. The XRS is an array of X-ray
micro-calorimeters which covers an energy range similar to the XIS
with a typical energy resolution of 12 eV.
The basic concept of the mirrors (XRT) is an improvement over ASCA.
The mirrors will have a finer imaging capability (about 1 arcminute
half-power diameter) and a larger total effective area than ASCA. The
mirror diameter will be 40 cm. The focal lengths will be 4.5 m for XRS
and 4.75 m for XIS.
NASA-GSFC, Nagoya University and ISAS are responsible for the
development of the XRT.
The prime instrument on Astro-E, the XRS is a high-resolution X-ray
spectrometer to measure the spectra of X-ray sources. The instrument
was built by ISAS and NASA, and uses an array of X-ray
micro-calorimeters and foil mirrors to achieve an unprecedented
combination of high resolution and large collecting area.
The XRS is expected to last for 2 years, by which time the solid
neon which keeps the detectors cold will all have melted. The other
instruments on the spacecraft will continue to operate for several
XIS consists of four CCD X-ray imaging spectrometers, also using foil
mirrors, which provide images of X-ray sources. The detectors were
built by MIT.
HXD is a hard X-ray detector designed to observe high-energy (10-700
keV) X-rays. The HXD will utilize well-type phoswich scintillators
with embedded silicon detectors currently under development by the
University of Tokyo and ISAS. The HXD consists of 16 (4 x 4) modular
units and has an overall photon collecting area of about 350 cm2. Each
unit is a phoswich counter comprising a GSO fast scintillator and an
active BGO anticoincidence shield.
ISAS/JAXA Department of High Energy Astrophysics
Last Modified: Sunday, 05-Oct-2003 20:10:27 JST