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    radio emission tagged posts

    Astronomers Capture Black Hole Eruption Spanning 16 times the Full Moon in the sky

    December 24, 2021, Categories  Astronomy/Space

    Astronomers have produced the most comprehensive image of radio emission from the nearest actively feeding supermassive black hole to Earth.

    The emission is powered by a central black hole in the galaxy Centaurus A, about 12 million light years away.

    As the black hole feeds on in-falling gas, it ejects material at near light-speed, causing ‘radio bubbles’ to grow over hundreds of millions of years.

    When viewed from Earth, the eruption from Centaurus A now extends eight degrees across the sky — the length of 16 full Moons laid side by side.

    It was captured using the Murchison Widefield Array (MWA) telescope in outback Western Australia.

    The research was published today in the journal Nature Astronomy.

    Lead author Dr Benjamin McKinley, from the Curtin University node o...

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    Astronomers Reveal True Colors of Evolving Galactic Beasts

    August 9, 2019, Categories  Astronomy/Space

    The percentage of both the full colour-selected (filled markers) and the L6μm−z matched (open markers) samples (using the colour scheme in Fig. 2) with different radio morphologies. The fractions are reported in five categories: faint sources detected near the sensitivity limit (Fpeak < 3 mJy), bright compact radio sources, bright extended radio sources, FR II-like systems, and compact FR IIs (small scale lobe-systems); see Table 4 for more details. The error bars correspond to the 1σ binomial uncertainties and the vertical dash lines separate the different categories. Example 2 arcmin × 2 arcmin FIRST images of each morphological are illustrated in the top panel. The white circle represents our cross-matching radius of 10 arcsec. Extended radio emission is found among a similar fraction of all quasars, but red quasars show a surfeit of compact and faint systems.
    The percentage of both the full colour-selected (filled markers) and the L6μm−z matched (open markers) samples (using the colour scheme in Fig. 2) with different radio morphologies. The fractions are reported in five categories: faint sources detected near the sensitivity limit (Fpeak < 3 mJy), bright compact radio sources, bright extended radio sources, FR II-like systems, and compact FR IIs (small scale lobe-systems); see Table 4 for more details. The error bars correspond to the 1σ binomial uncertainties and the vertical dash lines separate the different categories. Example 2 arcmin Ã— 2 arcmin FIRST images of each morphological class are illustrated in the top panel. The white circle represents our cross-matching radius of 10 arcsec...
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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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