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    protoclusters tagged posts

    ‘Yellowballs’ offer new insights into Star Formation

    April 14, 2021, Categories  Astronomy/Space

    "yellowball" image one
    An example of a yellowball (left, circled) and a bubble (right, circled) as seen in infrared images from NASA’s Spitzer Space Telescope. A typical yellowball has a diameter of about a light-year, while a bubble can grow to tens of light-years. This false-color image uses a blue-green-red color scheme to depict infrared wavelengths used in the Milky Way Project and gives rise to the ‘yellow’ color of the feature.
    Credit: NASA/JPL-Caltech.

    A serendipitous discovery by citizen scientists has provided a unique new window into the diverse environments that produce stars and star clusters, revealing the presence of “stellar nurseries” before infant stars emerge from their birth clouds, according to Planetary Science Institute Senior Scientist Grace Wolf-Chase.

    “Yellowballs are small co...

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    Double or Nothing: Astronomers Rethink Quasar Environment

    March 14, 2018, Categories  Astronomy/Space

    Stars indicate quasars and bright (faint) galaxies at the same epoch are shown as circles (dots). The galaxy overdensity with respect to the average density is shown by the contour. The pair members are associated with high density regions of galaxies. Credit: NAOJ

    Stars indicate quasars and bright (faint) galaxies at the same epoch are shown as circles (dots). The galaxy overdensity with respect to the average density is shown by the contour. The pair members are associated with high density regions of galaxies. Credit: NAOJ

    Astronomers have identified nearly 200 ‘protoclusters,’ the progenitors of galaxy clusters, in the early Universe, about 12 billion years ago, about 10X more than previously known. They also found that quasars don’t tend to reside in protoclusters; but if there is one quasar in a protocluster, there is likely a second nearby. This result raises doubts about the relation between protoclusters and quasars.

    In the Universe, galaxies are not distributed uniformly...

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