eROSITA Science

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eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the primary instrument on the Russian Spektrum-Roentgen-Gamma (SRG) mission. eROSITA is currently being built, assembled and tested under the leadership of the Max-Planck Institute for extraterrestrial Physics (MPE). In the first four years of scientific operation after its launch, foreseen for 2017, eROSITA will perform a deep survey of the entire X-ray sky. In the soft X-ray band (0.5-2 keV), this will be about 20 times more sensitive than the ROSAT all sky survey, while in the hard band (2-10 keV) it will provide the first ever true imaging survey of the sky at those energies. Such a sensitive all-sky survey will revolutionize our view of the high-energy sky, and calls for major efforts in synergic, multi-wavelength wide area surveys in order to fully exploit the scientific potential of the X-ray data. The all-sky survey program will be followed by an estimated 3.5 years of pointed observations, with open access through regular announcement of opportunities for the entire astrophysical community. With on-axis spatial resolution similar to the XMM-Newton one, a comparable effective area at low energies, and a wider field of view, eROSITA will provide a powerful and highly competitive X-ray observatory for the next decade.

The design-driving science of eROSITA is the detection of very large samples (~100,000 objects) of galaxy clusters out to redshifts z>1, in order to study the large scale structure in the Universe, test and characterize cosmological models including Dark Energy (DE). eROSITA is also expected to yield a sample of around 3 millions Active Galactic Nuclei, including both obscured and un-obscured objects, providing a unique view of the evolution of supermassive black holes within the emerging cosmic structure. The survey will also provide new insights into a wide range of astrophysical phenomena, including accreting binaries, active stars and diffuse emission within the Galaxy, as well as solar system bodies that emit X-rays via the charge exchange process. Finally, such a deep imaging survey at high spectral resolution, with its scanning strategy sensitive to a range of variability timescales from tens of seconds to years, will undoubtedly open up a vast discovery space for the study of rare, unpredicted, or unpredictable high-energy astrophysical phenomena.

Performances and characteristics

Summary of expected characteristics of the eROSITA telescope and of its survey performances
eRosita planned survey area versus flux in comparison to existing AGN surveys
eRosita planned survey area versus flux in comparison to existing cluster surveys

eRosita zoom of a ~6 arcmin region by side (for each cutout) which compares eROSITA, XMM and Chandra
COSMOS field as simulated FOV by eRosita

© High-Energy Astrophysics Group at MPE

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