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    spiral galaxies tagged posts

    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)

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    Astronomers have shown for the 1st time that Galaxies can Change their Structure over their Lifetime

    August 27, 2015, Categories  Astronomy/Space

    This artist's concept illustrates the two types of spiral galaxies that populate our universe: those with plump middles, or central bulges (upper left), and those lacking the bulge (foreground). Credit: NASA

    This artist’s concept illustrates the two types of spiral galaxies that populate our universe: those with plump middles, or central bulges (upper left), and those lacking the bulge (foreground). Credit: NASA

    A large proportion of galaxies have undergone a major ‘metamorphosis’ since they were initially formed after the Big Bang. By providing the first direct evidence of the extent of this transformation, the team hope to shed light on the processes that caused these dramatic changes. They observed around 10,000 galaxies using a survey of the sky created by the Herschel ATLAS and GAMA projects.

    The researchers then classified the galaxies into the 2 main types: flat, rotating, disc-shaped galaxies (much like our own galaxy, the Milky Way); and large, oval-shaped galaxies with a swarm of dis...

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