Abstract
Arcus is a NASA/MIDEX mission under development in response to the
anticipated 2016 call for proposals. It is a freeflying, soft X-ray
grating spectrometer with the highest-ever spectral resolution in the
8-51 Å (0.24 - 1.55 keV) energy range. The Arcus bandpass includes
the most sensitive tracers of diffuse million-degree gas: spectral lines
from O VII and O VIII, H- and He-like lines of C, N, Ne and Mg, and
unique density- and temperature-sensitive lines from Si and Fe ions.
These capabilities enable an advance in our understanding of the
formation and evolution of baryons in the Universe that is unachievable
with any other present or planned observatory. The mission will address
multiple key questions posed in the Decadal Survey1 and
NASA's 2013 Roadmap2: How do baryons cycle in and out of
galaxies? How do black holes and stars influence their surroundings and
the cosmic web via feedback? How do stars, circumstellar disks and
exoplanet atmospheres form and evolve? Arcus data will answer these
questions by leveraging recent developments in off-plane gratings and
silicon pore optics to measure X-ray spectra at high resolution from a
wide range of sources within and beyond the Milky Way. CCDs with strong
Suzaku heritage combined with electronics based on the Swift mission
will detect the dispersed X-rays. Arcus will support a broad
astrophysical research program, and its superior resolution and
sensitivity in soft X-rays will complement the forthcoming Athena
calorimeter, which will have comparably high resolution above 2 keV.
Original language | English |
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Number of pages | 18 |
Journal | Proceedings of SPIE |
Volume | 9905 |
DOIs | |
Publication status | Published - 18 Jul 2016 |
Externally published | Yes |