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    star formation tagged posts

    A Massive Galaxy long ago and Far away

    February 6, 2017, Categories  Astronomy/Space

    1. An extremely massive elliptical galaxy at about three billion years after the big bang, as seen in an optical/near-infrared image. The galaxy is about ten times more massive than the Milky Way. Today the galaxy is not actively producing new stars, but its population of old, red stars appears to be the result of earlier episodes during which the galaxy was one of the most active star-forming examples known. Credit: NASA/Hubble 2. Age and abundance patterns of COSMOS-11494 in comparison to lower-redshift quiescent galaxies.

    1. An extremely massive elliptical galaxy at about three billion years after the big bang, as seen in an optical/near-infrared image. The galaxy is about ten times more massive than the Milky Way. Today the galaxy is not actively producing new stars, but its population of old, red stars appears to be the result of earlier episodes during which the galaxy was one of the most active star-forming examples known. Credit: NASA/Hubble
    2. Age and abundance patterns of COSMOS-11494 in comparison to lower-redshift quiescent galaxies.

    Galaxies today fall roughly into 2 categories: elliptically-shaped collections of reddish, old stars that formed predominantly during a period early in the history of the universe, and spiral shaped objects dominated by blue, young stars...

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    Star Birth with a chance of Winds?

    January 28, 2017, Categories  Astronomy/Space

    The lesser-known constellation of Canes Venatici (The Hunting Dogs), is home to a variety of deep-sky objects -- including this beautiful galaxy, known as NGC 4861. Astronomers are still debating on how to classify it. While its physical properties -- such as mass, size and rotational velocity -- indicate it to be a spiral galaxy, its appearance looks more like a comet with its dense, luminous 'head' and dimmer 'tail' trailing off. Features more fitting with a dwarf irregular galaxy. Credit: ESA/Hubble & NASA

    The lesser-known constellation of Canes Venatici (The Hunting Dogs), is home to a variety of deep-sky objects — including this beautiful galaxy, known as NGC 4861. Astronomers are still debating on how to classify it. While its physical properties — such as mass, size and rotational velocity — indicate it to be a spiral galaxy, its appearance looks more like a comet with its dense, luminous ‘head’ and dimmer ‘tail’ trailing off. Features more fitting with a dwarf irregular galaxy. Credit: ESA/Hubble & NASA

    The lesser-known constellation of Canes Venatici (The Hunting Dogs), is home to a variety of deep-sky objects – including this beautiful galaxy, known as NGC 4861. Astronomers are still debating on how to classify it...

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    Hubble chases a small Stellar Galaxy in the Hunting Dog

    December 23, 2016, Categories  Astronomy/Space

    On a clear evening in April of 1789, the renowned astronomer William Herschel continued his unrelenting survey of the night sky, hunting for new cosmic objects -- and found cause to celebrate! He spotted this bright spiral galaxy, named NGC 4707, lurking in the constellation of Canes Venatici or The Hunting Dog. NGC 4707 lies roughly 22 million light-years from Earth. Credit: ESA/Hubble & NASA

    On a clear evening in April of 1789, the renowned astronomer William Herschel continued his unrelenting survey of the night sky, hunting for new cosmic objects — and found cause to celebrate! He spotted this bright spiral galaxy, named NGC 4707, lurking in the constellation of Canes Venatici or The Hunting Dog. NGC 4707 lies roughly 22 million light-years from Earth. Credit: ESA/Hubble & NASA

    On a clear evening in April of 1789, the renowned astronomer William Herschel continued his unrelenting survey of the night sky, hunting for new cosmic objects – and found cause to celebrate! He spotted this bright spiral galaxy, named NGC 4707, lurking in the constellation of Canes Venatici or The Hunting Dog. NGC 4707 lies roughly 22 million light-years from Earth.

    NGC stands for “New General Catalo...

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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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