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    VLA tagged posts

    Astronomers make 1st Detection of Polarized Radio Waves in Gamma Ray Burst jets

    June 22, 2019, Categories  Astronomy/Space

    Black hole illustration (stock image).
    Credit: © cosmicvue / Adobe Stock

    Good fortune and cutting-edge scientific equipment have allowed scientists to observe a Gamma Ray Burst jet with a radio telescope and detect the polarisation of radio waves within it for the first time – moving us closer to an understanding of what causes the universe’s most powerful explosions.

    Gamma Ray Bursts (GRBs) are the most energetic explosions in the universe, beaming out mighty jets which travel through space at over 99.9% the speed of light, as a star much more massive than our sun collapses at the end of its life to produce a black hole.

    Studying the light from Gamma Ray Burst jets as we detect it travelling across space is our best hope of understanding how these powerful jets are formed, but...

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    VLA makes 1st Direct Image of Key Feature of Powerful Radio Galaxies

    April 3, 2019, Categories  Astronomy/Space

    Artist’s conception of the dusty, doughnut-shaped object surrounding the supermassive black hole, disk of material orbiting the black hole, and jets of material ejected by the disk, at the center of a galaxy.
    Credit: Bill Saxton, NRAO/AUI/NSF

    Structure suggested by theorists decades ago. Astronomers used the Karl G. Jansky Very Large Array (VLA) to make the first direct image of a dusty, doughnut-shaped feature surrounding the supermassive black hole at the core of one of the most powerful radio galaxies in the Universe – a feature first postulated by theorists nearly four decades ago as an essential part of such objects.

    The scientists studied Cygnus A, a galaxy some 760 million light-years from Earth. The galaxy harbors a black hole 2...

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    First look at Birthplaces of most current stars

    December 21, 2016, Categories  Astronomy/Space

    Radio/Optical combination images of distant galaxies as seen with NSF's Very Large Array and NASA's Hubble Space Telescope. Their distances from Earth are indicated in the top set of images. Below, the same images, without labels. Credit: K. Trisupatsilp, NRAO/AUI/NSF, NASA.

    Radio/Optical combination images of distant galaxies as seen with NSF’s Very Large Array and NASA’s Hubble Space Telescope. Their distances from Earth are indicated in the top set of images. Below, the same images, without labels. Credit: K. Trisupatsilp, NRAO/AUI/NSF, NASA.

    Highly sensitive images reveal details of distant galaxies. Astronomers have gotten their first look at exactly where most of today’s stars were born. To do so, they used the Karl G. Jansky Very Large Array (VLA) and Atacama Large Millimeter/ submillimeter Array (ALMA) to look at distant galaxies seen as they were some 10 billion years ago. At that time, the Universe was experiencing its peak rate of star formation. Most stars in the present Universe were born then.

    “We knew that galaxies in that era were forming sta...

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    Spectacular ‘Halos’ of Spiral Galaxies

    October 15, 2015, Categories  Astronomy/Space

    Composite image of an edge-on spiral galaxy with a radio halo produced by fast-moving particles in the galaxy's magnetic field. In this image, the large, grey-blue area is a single image formed by combining the radio halos of 30 different galaxies, as seen with the Very Large Array. At the center is a visible-light image of one of the galaxies, NGC 5775, made using the Hubble Space Telescope. This visible-light image shows only the inner part of the galaxy's star-forming region, outer portions of which extend horizontally into the area of the radio halo. Credit: Jayanne English (U. Manitoba), with support from Judith Irwin and Theresa Wiegert (Queen’s U.) for the CHANG-ES consortium; NRAO/AUI/NSF; NASA/STScI (Science credit: Theresa Wiegert, Judith Irwin and the CHANG-ES consortium)

    Composite image of an edge-on spiral galaxy with a radio halo produced by fast-moving particles in the galaxy’s magnetic field. In this image, the large, grey-blue area is a single image formed by combining the radio halos of 30 different galaxies, as seen with the Very Large Array. At the center is a visible-light image of one of the galaxies, NGC 5775, made using the Hubble Space Telescope. This visible-light image shows only the inner part of the galaxy’s star-forming region, outer portions of which extend horizontally into the area of the radio halo. Credit: Jayanne English (U. Manitoba), with support from Judith Irwin and Theresa Wiegert (Queen’s U.) for the CHANG-ES consortium; NRAO/AUI/NSF; NASA/STScI (Science credit: Theresa Wiegert, Judith Irwin and the CHANG-ES consortium)

    Impr...

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