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    star formation tagged posts

    Hubble finds Early, Massive Galaxies Running on Empty

    September 25, 2021, Categories  Astronomy/Space

    These images are composites from NASA’s Hubble Space Telescope and the Atacama Large Millimeter/submillimeter Array (ALMA). The boxed and pullout images show two of the six, distant, massive galaxies where scientists found star formation has ceased due to the depletion of a fuel source – cold hydrogen gas. Hubble, together with ALMA, found these odd galaxies when they combined forces with the “natural lens” in space created by foreground massive galaxy clusters. The clusters’ gravity stretches and amplifies the light of the background galaxies in an effect called gravitational lensing. This phenomenon allows astronomers to use massive galaxy clusters as natural magnifying glasses to study details in the distant galaxies that would otherwise be impossible to see...
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    Galactic Fireworks: New ESO images reveal stunning features of Nearby Galaxies

    July 17, 2021, Categories  Astronomy/Space

    A team of astronomers has released new observations of nearby galaxies that resemble colourful cosmic fireworks. The images, obtained with the European Southern Observatory’s Very Large Telescope (ESO’s VLT), show different components of the galaxies in distinct colours, allowing astronomers to pinpoint the locations of young stars and the gas they warm up around them. By combining these new observations with data from the Atacama Large Millimeter/submillimeter Array (ALMA), in which ESO is a partner, the team is helping shed new light on what triggers gas to form stars.

    A team of astronomers has released new observations of nearby galaxies that resemble colourful cosmic fireworks...

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    Satellite Galaxies can carry on Forming Stars when they Pass Close to their Parent Galaxies

    July 9, 2021, Categories  Astronomy/Space

    Image of the simulated local group used for the article. Left, image of dark matter; on the right, gas distribution. The three main galaxies of the Local Group (MW, M31 and M33) are indicated. Credit: CLUES simulation team.
    Image of the simulated local group used for the article. Left, image of dark matter; on the right, gas distribution. The three main galaxies of the Local Group (MW, M31 and M33) are indicated. Credit: CLUES simulation team

    Historically most scientists thought that once a satellite galaxy has passed close by its higher mass parent galaxy its star formation would stop because the larger galaxy would remove the gas from it, leaving it shorn of the material it would need to make new stars. However, for the first time, a team led by the researcher at the Instituto de Astrofísica de Canarias (IAC), Arianna di Cintio, has shown using numerical simulations that this is not always the case...

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    36 Dwarf Galaxies had simultaneous ‘Baby Boom’ of New Stars

    May 25, 2021, Categories  Astronomy/Space

    Dwarf galaxies
    The Milky Way-like galaxy NGC 1232 (center) shows the Milky Way’s location and relative size. Images of dwarf galaxies are centered close to their true locations but have been magnified for visibility. Credit: Charlotte Olsen

    Surprising finding challenges current theories on how galaxies grow. Three dozen dwarf galaxies far from each other had a simultaneous “baby boom” of new stars, an unexpected discovery that challenges current theories on how galaxies grow and may enhance our understanding of the universe.

    Galaxies more than 1 million light-years apart should have completely independent lives in terms of when they give birth to new stars...

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