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    Globular Clusters tagged posts

    New Treasure Trove of Globular Clusters holds Clues about Galaxy Evolution

    January 12, 2022, Categories  Astronomy/Space

    Centaurus A is an elliptical galaxy located about 13 million light-years from Earth. This color composite image reveals the lobes and jets emanating from the active galaxy’s central black hole.ESO/WFI (Optical); MPIfR/ESO/APEX/A.Weiss et al. (Submillimetre); NASA/CXC/CfA/R.Kraft et al. (X-ray)

    Using observations of Centaurus A, a nearby elliptical galaxy, obtained with the Gaia space telescope and ground-based instruments under the PISCeS survey, a team of astronomers presents an unprecedented number of globular cluster candidates in the outer regions of the galaxy. The findings provide astronomers with an even more detailed picture of galactic architecture and history of collisions and mergers.

    A survey completed using a combination of ground and space-based telescopes yielded a ...

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    Astronomers discover an Oversized Black Hole Population in the Star Cluster Palomar 5

    July 6, 2021, Categories  Astronomy/Space

    Above is a all sky view in galactic coordinates. The number of stars is higher in brighter regions. Most of the image, where the Milky Way plane is visible (b = 0 degrees), is produced using Gaia eDR3 data. The small patch in the top-centre shows a region where deeper DESI Legacy Imaging Survey (DECaLS) data is available, which allows for Palomar 5 and its tidal tails to be seen. Image: M. Gieles et al./Gaia eDR3/DESI DECaLS

    Palomar 5 is a unique star cluster. This is firstly because it is one of the “fluffiest” clusters in the halo of our Galaxy, with the average distance between the stars being a few light-years, comparable to the distance from the Sun to the nearest star. Secondly, it has a specular stellar stream associated with it that spans more than 20 degrees across the sky...

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    Milky Way Family Tree

    November 24, 2020, Categories  Astronomy/Space

    Family tree of the Milky Way. The main progenitor of the Milky Way is denoted by the trunk of the tree, coloured by stellar mass. Black lines indicate the five identified galaxies. Grey dotted lines depict other mergers that the Milky Way experienced that could not be connected to a specific progenitor. From left to right, the six images along the top of the figure indicate the identified progenitor galaxies: Sagittarius, Sequoia, Kraken, the Milky Way’s Main progenitor, the progenitor of the Helmi streams, and Gaia-Enceladus-Sausage. | © D. Kruijssen

    Astrophysicists reconstruct the galaxy merger history of our home galaxy. Galaxies like the Milky Way formed by the merging of smaller progenitor galaxies...

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    Anemic Star Cluster breaks Metal-Poor Record

    October 17, 2020, Categories  Astronomy/Space

    The RBC EXT8 globular cluster orbits the outskirts of the Andromeda Galaxy, a close companion to our Milky Way Galaxy, located 2.5 million light-years from Earth. Credit: ESASky/CFHT

    In a surprising discovery, astronomers using two Maunakea Observatories — W. M. Keck Observatory and Canada-France-Hawaii Telescope (CFHT) — have found a globular star cluster in the Andromeda Galaxy that contains a record-breaking low amount of metals.

    The stars in the cluster, called RBC EXT8, have on average 800 times less iron than our Sun and are three times more iron-poor than the previous globular cluster record-holder. RBC EXT8 is also extremely deficient in magnesium.

    The study, led by Søren Larsen of Radboud University in the Netherlands, is published in today’s issue of the journal Science...

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