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    ALMA tagged posts

    Galaxy Growth in a Massive Halo in the 1st Billion years of Cosmic history

    December 11, 2017, Categories  Astronomy/Space

    The Aurora Australis, or Southern Lights, over the South Pole Telescope at NSF's Amundsen-Scott South Pole Station. Credit: Dr. Keith Vanderlinde, NSF

    The Aurora Australis, or Southern Lights, over the South Pole Telescope at NSF’s Amundsen-Scott South Pole Station. Credit: Dr. Keith Vanderlinde, NSF

    Observations of two galaxies made with ALMA radio telescope suggest that large galaxies formed faster than scientists had previously thought. The two galaxies, first discovered by the South Pole Telescope at NSF’s Amundsen-Scott South Pole Station in Antarctica, were massive and star-filled at a time when the cosmos was < 1B years old. The observation came as a surprise, considering astronomers had thought that the first galaxies, which formed just a few hundred million years after the Big Bang, were similar to today’s dwarf galaxies – collections of stars much smaller than the Milky Way...

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    Another Close-by Planetary System?

    November 3, 2017, Categories  Uncategorized

    This artist's impression shows how the newly discovered belts of dust around the closest star to the Solar System, Proxima Centauri, may look. ALMA observations revealed the glow coming from cold dust in a region between one to four times as far from Proxima Centauri as the Earth is from the Sun. The data also hint at the presence of an even cooler outer dust belt and indicate the presence of an elaborate planetary system. These structures are similar to the much larger belts in the Solar System and are also expected to be made from particles of rock and ice that failed to form planets. Note that this sketch is not to scale -- to make Proxima b clearly visible it has been shown further from the star and larger than it is in reality. Credit: ESO/M. Kornmesser

    This artist’s impression shows how the newly discovered belts of dust around the closest star to the Solar System, Proxima Centauri, may look. ALMA observations revealed the glow coming from cold dust in a region between one to four times as far from Proxima Centauri as the Earth is from the Sun. The data also hint at the presence of an even cooler outer dust belt and indicate the presence of an elaborate planetary system. These structures are similar to the much larger belts in the Solar System and are also expected to be made from particles of rock and ice that failed to form planets. Note that this sketch is not to scale — to make Proxima b clearly visible it has been shown further from the star and larger than it is in reality. Credit: ESO/M. Kornmesser

    ALMA discovers cold dust around ...

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    Shedding Light on Galaxies’ Rotation Secrets

    July 14, 2017, Categories  Astronomy/Space

    Image: . Angular Momentum of Early- and Late-type Galaxies: Nature or Nurture? The Astrophysical Journal, 2017; 843 (2): 105 DOI: 10.3847/1538-4357/aa7893

    Image: . Angular Momentum of Early- and Late-type Galaxies: Nature or Nurture? The Astrophysical Journal, 2017; 843 (2): 105 DOI: 10.3847/1538-4357/aa7893

    The dichotomy concerns the so-called angular momentum (per unit mass), that in physics is a measure of size and rotation velocity. Spiral galaxies are found to be strongly rotating, with an angular momentum higher by a factor of about 5 than ellipticals. What is the origin of such a difference? An international research team investigated the issue in a study just published in the Astrophysical Journal. The team was led by SISSA Ph.D. student JingJing Shi under the supervision of Prof. Andrea Lapi and Luigi Danese, and in collaboration with Prof. Huiyuan Wang from USTC (Hefei) and Dr. Claudia Mancuso from IRA-INAF (Bologna). The res...
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    Cosmic ‘Dust factory’ reveals clues to how Stars are Born

    July 10, 2017, Categories  Astronomy/Space

    This artist's illustration of Supernova 1987A reveals the cold, inner regions of the exploded star's remnants (red) where tremendous amounts of dust were detected and imaged by ALMA. This inner region is contrasted with the outer shell (blue), where the energy from the supernova is colliding (green) with the envelope of gas ejected from the star prior to its powerful detonation. Credit: A. Angelich; NRAO/AUI/NSF

    This artist’s illustration of Supernova 1987A reveals the cold, inner regions of the exploded star’s remnants (red) where tremendous amounts of dust were detected and imaged by ALMA. This inner region is contrasted with the outer shell (blue), where the energy from the supernova is colliding (green) with the envelope of gas ejected from the star prior to its powerful detonation. Credit: A. Angelich; NRAO/AUI/NSF

    A group of scientists led by researchers at Cardiff University have discovered a rich inventory of molecules at the centre of an exploded star for the very first time. 2 previously undetected molecules, formylium (HCO+) and sulphur monoxide (SO), were found in the cooling aftermath of Supernova 1987A, 163,000 light years away in a nearby neighbour of our own Milky Way galaxy...

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