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    galaxy formation tagged posts

    Extremely Young Galaxy is Milky Way Look-Alike

    August 14, 2020, Categories  Astronomy/Space

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    Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA), in which the European Southern Observatory (ESO) is a partner, have revealed an extremely distant and therefore very young galaxy that looks surprisingly like our Milky Way. The galaxy is so far away its light has taken more than 12 billion years to reach us: we see it as it was when the Universe was just 1.4 billion years old. It is also surprisingly unchaotic, contradicting theories that all galaxies in the early Universe were turbulent and unstable. This unexpected discovery challenges our understanding of how galaxies form, giving new insights into the past of our Universe.

    Galaxy is distorted, appearing as a ring of light in the sky...

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    Cosmologists Create Largest Simulation of Galaxy Formation, break their own record

    March 19, 2018, Categories  Astronomy/Space

    This is a composite which combines gas temperature (as the color) and shock mach number (as the brightness). Red indicates 10 million Kelvin gas at the centers of massive galaxy clusters, while bright structures show diffuse gas from the intergalactic medium shock heating at the boundary between cosmic voids and filaments. Credit: Illustris Team

    This is a composite which combines gas temperature (as the color) and shock mach number (as the brightness). Red indicates 10 million Kelvin gas at the centers of massive galaxy clusters, while bright structures show diffuse gas from the intergalactic medium shock heating at the boundary between cosmic voids and filaments. Credit: Illustris Team

    A multi-institutional team gives the cosmology community a world-class simulation to study how the universe formed. Humans have long tried to explain how stars came to light up the night sky. The wide array of theories throughout history have one common (and correct) governing principle that astrophysicists still use to this day: by understanding the stars and their origins, we learn more about where we come from...

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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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    New Dwarf Satellite galaxy of Messier 83 found

    December 5, 2016, Categories  Astronomy/Space

    New dwarf satellite galaxy of Messier 83 found

    A deep photographic image of M83 taken using the UK Schmidt Telescope by Malin & Hadley (1997, figure reproduced with permission) where the white scale bar corresponds to 30 arcmin. The northern stream appears not to be associated with dw1335-29, circled in red. Credit: Carrillo et al., 2016.

    M83, Southern Pinwheel Galaxy has a newly found dwarf satellite 85,000 light years from its host. This satellite galaxy was designated dw1335-29 and could be an irregular or a transition dwarf. Messier 83 is one of the closest and brightest barred spiral galaxies. It is located about 15 million light years away in the constellation Hydra. Finding new satellites of galaxies beyond the Local Group such as Messier 83 could provide essential insights on galaxy formation in a cosmological context.

    In 2015,...

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