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    ALMA tagged posts

    ALMA Spots Twinkling Heart of Milky Way

    May 23, 2020, Categories  Astronomy/Space

    Hot spots circling around the black hole could produce the quasi-periodic millimeter emission detected with ALMA. Credit: Keio University

    Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) found quasi-periodic flickers in millimeter-waves from the center of the Milky Way, Sagittarius (Sgr) A*. The team interpreted these blinks to be due to the rotation of radio spots circling the supermassive black hole with an orbit radius smaller than that of Mercury. This is an interesting clue to investigate space-time with extreme gravity.

    “It has been known that Sgr A* sometimes flares up in millimeter wavelength,” tells Yuhei Iwata, the lead author of the paper published in the Astrophysical Journal Letters and a graduate student at Keio University, Japan...

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    ALMA Discovers Massive Rotating Disk in Early Universe

    May 21, 2020, Categories  Astronomy/Space

    Artist impression of the Wolfe Disk, a massive rotating disk galaxy in the early, dusty universe. The galaxy was initially discovered when ALMA examined the light from a more distant quasar (top left).
    Credit: NRAO/AUI/NSF, S. Dagnello

    In our 13.8 billion-year-old universe, most galaxies like our Milky Way form gradually, reaching their large mass relatively late. But a new discovery made with the Atacama Large Millimeter/submillimeter Array (ALMA) of a massive rotating disk galaxy, seen when the universe was only ten percent of its current age, challenges the traditional models of galaxy formation. This research appears on 20 May 2020 in the journal Nature.

    Galaxy DLA0817g, nicknamed the Wolfe Disk after the late astronomer Arthur M...

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    ALMA resolves Gas impacted by Young Jets from Supermassive Black Hole

    March 30, 2020, Categories  Astronomy/Space

    Reconstructed images of what MG J0414+0534 would look like if gravitational lensing effects were turned off. The emissions from dust and ionized gas around a quasar　are shown in red. The emissions from carbon monoxide gas are shown in green, which have a bipolar structure along the jets.
    Credit: ALMA (ESO/NAOJ/NRAO), K. T. Inoue et al.

    Astronomers obtained the first resolved image of disturbed gaseous clouds in a galaxy 11 billion light-years away by using the Atacama Large Millimeter/submillimeter Array (ALMA). The team found that the disruption is caused by young powerful jets ejected from a supermassive black hole residing at the center of the host galaxy. This result will cast light on the mystery of the evolutionary process of galaxies in the early Universe.

    It is commonly k...

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    Massive Gas Disk raises questions about Planet Formation Theory

    December 25, 2019, Categories  Astronomy/Space

    20191223_Higuchi_49Ceti_ALMA_separated_E
    ALMA image of the debris disk around the young star 49 Ceti. The distribution of dust is shown in red; the distribution of carbon monoxide is shown in green; and the distribution of carbon atoms is shown in blue.
    Credit: ALMA (ESO/NAOJ/NRAO), Higuchi et al.

    Astronomers using the Atacama Large Millimeter/submillimeter Array (ALMA) found a young star surrounded by an astonishing mass of gas. The star, called 49 Ceti, is 40 million years old and conventional theories of planet formation predict that the gas should have disappeared by that age. The enigmatically large amount of gas requests a reconsideration of our current understanding of planet formation.

    Planets are formed in gaseous dusty disks called protoplanetary disks around young stars...

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