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    eROSITA X-ray telescope tagged posts

    Study using X-Ray Telescope indicates that Dark Energy is Uniformly Distributed in Space and Time

    May 4, 2023, Categories  Astronomy/Space

    eROSITA X-Ray study indicates that dark energy is uniformly distributed in space and time
    X-ray (over) and optical pseudo-color (below) images of three low mass clusters identified in the eFEDS survey data. The highest redshift cluster come from a time when the universe was approximately 10 billion years younger than today. The cluster galaxies in that case are clearly much redder than the galaxies in the other two clusters. Credit: eRosita

    When Edwin Hubble observed distant galaxies in the 1920s, he made the groundbreaking discovery that the universe is expanding. It was not until 1998, however, that scientists observing Type Ia supernovae further discovered that the universe is not just expanding but has begun a phase of accelerating expansion. “To explain this acceleration, we need a source,” says Joseph Mohr, astrophysicist at LMU...

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    Our Deepest View of the X-ray Sky

    June 21, 2020, Categories  Astronomy/Space

    The energetic universe: The first eROSITA all-sky survey was conducted over a period of six months by letting the telescope rotate continuously, thus providing a uniform exposure of about 150-200 seconds over most of the sky, with the ecliptic poles being visited more deeply. As eROSITA scans the sky, the energy of the collected photons is measured with an accuracy ranging from 2% – 6%. To generate this image, in which the whole sky is projected onto an ellipse (so-called Aitoff projection) with the centre of the Milky Way in the middle and the body of the Galaxy running horizontally, photons have been colour-coded according to their energy (red for energies 0.3-0.6 keV, green for 0.6-1 keV, blue for 1-2.3 keV). 
    © Jeremy Sanders, Hermann Brunner und das eSASS-Team (MPE); Eugene Churazov,...
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