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    Quasars tagged posts

    Hubble Sees Aftermath of Galaxy’s Scrape with Milky Way

    November 15, 2024, Categories  Astronomy/Space

    A whitish, whirlpool-like galaxy at middle of top edge, and a tadpole-shaped structure sweeps from left to right across lower half. A label pointing to outer, left of galaxy reads “Earth.” Faint, purple haze labeled “Milky Way Halo” surrounds galaxy and stretches to graphic’s edges. The tadpole-shaped object is the Large Magellanic Cloud, or LMC, with its own halo and streaming tail. Semi-circular, progressively darker layers of purple labeled “LMC Halo” surround the LMC, which appears roughly circular, with a central, light-yellow bar. Cloud-like features sprinkled with white specks surround this bar. Trailing the LMC is a large, tail-like feature labeled “Stream.” At the bottom left corner of graphic are several small, bright points of light labeled “Quasars.” Three light blue lines point from the label “Earth” through the LMC’s halo, and to three corresponding quasars. At the bottom, right corner is the label “Artist’s Concept.”
    This artist’s concept shows the Large Magellanic Cloud, or LMC, in the foreground as it passes through the gaseous halo of the much more massive Milky Way galaxy. The encounter has blown away most of the spherical halo of gas that surrounds the LMC, as illustrated by the trailing gas stream reminiscent of a comet’s tail. Still, a compact halo remains, and scientists do not expect this residual halo to be lost. The team surveyed the halo by using the background light of 28 quasars, an exceptionally bright type of active galactic nucleus that shines across the universe like a lighthouse beacon. Their light allows scientists to “see” the intervening halo gas indirectly through the absorption of the background light...
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    Investigating the Contribution of Gamma-Ray Blazar Flares to Neutrino Flux

    November 21, 2023, Categories  Astronomy/Space

    Fermi spots a record flare from blazar.
    Caption: A new study suggests that high-energy neutrinos of blazars might be produced mainly during the gamma-ray flare phase.
    Credit: NASA Goddard Space Flight Center from flickr (https://www.flickr.com/photos/24662369@N07/19578977022)
    License type: CC BY 2.0

    Gamma-ray flares from blazars can be accompanied by high-energy neutrino emission. To better understand this phenomenon, an international research team has statistically analyzed 145 bright blazars. They constructed weekly binned light curves and utilized a Bayesian algorithm, finding that their sample was dominated by blazars with low flare duty cycles and energy fractions. The study suggests that high-energy neutrinos of blazars might be produced mainly during the flare phase.

    Blazars ...

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    Hidden Supermassive Black Holes reveal their Secrets through Radio Signals

    September 27, 2023, Categories  Astronomy/Space

    An artist’s impression of a red quasar. Red quasars are enshrouded by gas and dust, which may get blown away by outflows from the supermassive black hole, eventually revealing a typical blue quasar. Credit: S. Munro & L. Klindt Licence: Attribution (CC BY 4.0)
    I think this is the strongest evidence so far that red quasars are a key element in how galaxies evolve
    Dr Victoria Fawcett

    Astronomers have found a striking link between the amount of dust surrounding a supermassive black hole and the strength of the radio emission produced in extremely bright galaxies. The findings are published in the Monthly Notices of the Royal Astronomical Society.

    The team of international astronomers, led by Newcastle University and Durham University, UK, used new data from the Dark Energy Spectroscopic Instrument (DESI), which is conducting a five year survey of large scale structure in the universe that will include optical spectra for ~3 million quasars; extremely bright galaxies powered by supermassive black holes...

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    Cracking a Mystery of Massive Black Holes and Quasars with Supercomputer Simulations

    August 18, 2021, Categories  Uncategorized

    Distribution of gas across scales, with the gas density increasing from purple to yellow. The top left panel shows a large region containing tens of galaxies (6 million light-years across). Subsequent panels zoom in progressively into the nuclear region of the most massive galaxy and down to the vicinity of the central supermassive black hole. Gas clumps and filaments fall from the inner edge of the central cavity occasionally feeding the black hole. Credit: Anglés-Alcázar et al. 2021, ApJ, 917, 53.
    Distribution of gas across scales, with the gas density increasing from purple to yellow. The top left panel shows a large region containing tens of galaxies (6 million light-years across). Subsequent panels zoom in progressively into the nuclear region of the most massive galaxy and down to the vicinity of the central supermassive black hole. Gas clumps and filaments fall from the inner edge of the central cavity occasionally feeding the black hole.
    (Credit: Anglés-Alcázar et al. 2021, ApJ, 917, 53.)

    Cracking a mystery of massive black holes and quasars with supercomputer simulations. At the center of galaxies, like our own Milky Way, lie massive black holes surrounded by spinning gas...

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