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    gravitational lensing tagged posts

    Mon ALMA discovers Rotating Infant Galaxy with help of Natural Cosmic Telescope

    April 23, 2021, Categories  Astronomy/Space

    Image of the galaxy cluster RXCJ0600-2007 taken by the NASA/ESA Hubble Space Telescope, combined with gravitational lensing images of the distant galaxy RXCJ0600-z6, 12.4 billion light-years away, observed by ALMA (shown in red). Due to the gravitational lensing effect by the galaxy cluster, the image of RXCJ0600-z6 was intensified and magnified, and appeared to be divided into three or more parts.
    Credit: ALMA (ESO/NAOJ/NRAO), Fujimoto et al., NASA/ESA Hubble Space Telescope

    Using the Atacama Large Millimeter/submillimeter Array (ALMA), astronomers found a rotating baby galaxy 1/100th the size of the Milky Way at a time when the Universe was only seven percent of its present age...

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    Dark Matter is Not Made Up of Tiny Black Holes

    April 4, 2019, Categories  Astronomy/Space, Physics

    The Milky Way galaxy (left) and the Andromeda galaxy (right) are separated by 2.6 million light years. Compared with the areas where stars are clustered together, dark matter is believed to be distributed over a much larger volume.
    Credit: Kavli IPMU

    An international team of researchers has put a theory speculated by the late Stephen Hawking to its most rigorous test to date, and their results have ruled out the possibility that primordial black holes smaller than a tenth of a millimeter make up most of dark matter. Details of their study have been published in this week’s Nature Astronomy.

    Scientists know that 85% of the matter in the Universe is made up of dark matter. Its gravitational force prevents stars in our Milky Way from flying apart...

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    Hyper Suprime-Cam survey Maps Dark Matter in the universe

    September 27, 2018, Categories  Astronomy/Space

    The weak lensing surveys such as HSC prefer a slightly less clumpy Universe (left) than that predicted by Planck (right). The pictures show the slight but noticeable difference as expected from large computer simulations. Credit: Hyper Suprime-Cam Survey

    The weak lensing surveys such as HSC prefer a slightly less clumpy Universe (left) than that predicted by Planck (right). The pictures show the slight but noticeable difference as expected from large computer simulations.
    Credit: Hyper Suprime-Cam Survey

    An international group of researchers, including Carnegie Mellon University’s Rachel Mandelbaum, has released the deepest wide field map of the 3D distribution of matter in the universe ever made and increased the precision of constraints for dark energy with the Hyper Suprime-Cam survey (HSC).

    The present-day universe is a pretty lumpy place...

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    How to Weigh Stars with Gravitational Lensing

    July 22, 2018, Categories  Astronomy/Space

    Image from the PAN-STARRS Telescope at Hawaii from early 2011 with the foreground star Ross 322 (blue square) and the background star (at the centre of the green circle) which will be traversed by Ross 322 in the next few weeks. By summer 2015, Ross 322 had moved to the position of the blue triangle (measured by Gaia). Since then, it has been moving along the blue-red line and is currently close to the position of the background star.

    Image from the PAN-STARRS Telescope at Hawaii from early 2011 with the foreground star Ross 322 (blue square) and the background star (at the centre of the green circle) which will be traversed by Ross 322 in the next few weeks. By summer 2015, Ross 322 had moved to the position of the blue triangle (measured by Gaia). Since then, it has been moving along the blue-red line and is currently close to the position of the background star.

    Astronomers have published the predictions of the passages of foreground stars in front of background stars. A team of astronomers, using ultra-precise measurements from the Gaia satellite, have accurately forecast two passages in the next months...

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