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    Gamma-ray emission from the Sagittarius dwarf spheroidal galaxy due to millisecond pulsars

    The Fermi bubbles are giant, γ-ray-emitting lobes emanating from the nucleus of the Milky Way discovered in ~1–100 GeV data collected by the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope. P...

    Roland M. Crocker, Oscar Macias, Dougal Mackey, Mark R. Krumholz… in Nature Astronomy (2022)

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    Article

    Millisecond pulsars from accretion-induced collapse as the origin of the Galactic Centre gamma-ray excess signal

    Gamma-ray data from the Fermi Large Area Telescope reveal an unexplained, apparently diffuse, signal from the Galactic bulge1–3 that peaks near ~2 GeV with an approximately spherical4 intensity profile ∝ r−2.4 (r...

    Anuj Gautam, Roland M. Crocker, Lilia Ferrario, Ashley J. Ruiter… in Nature Astronomy (2022)

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    The diffuse γ-ray background is dominated by star-forming galaxies

    The Fermi Gamma-ray Space Telescope has revealed a diffuse γ-ray background at energies from 0.1 gigaelectronvolt to 1 teraelectronvolt, which can be separated into emission from our Galaxy and an isotropic, e...

    Matt A. Roth, Mark R. Krumholz, Roland M. Crocker, Silvia Celli in Nature (2021)

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    Article

    Galactic bulge preferred over dark matter for the Galactic centre gamma-ray excess

    An anomalous gamma-ray excess emission has been found in the Fermi Large Area Telescope data1 covering the centre of the Galaxy2,3. Several theories have been proposed for this ‘Galactic centre excess’. They incl...

    Oscar Macias, Chris Gordon, Roland M. Crocker, Brenna Coleman… in Nature Astronomy (2018)

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    Article

    Diffuse Galactic antimatter from faint thermonuclear supernovae in old stellar populations

    Our Galaxy hosts the annihilation of a few 1043 low-energy positrons every second. Radioactive isotopes capable of supplying such positrons are synthesized in stars, stellar remnants and supernovae. For decades, ...

    Roland M. Crocker, Ashley J. Ruiter, Ivo R. Seitenzahl… in Nature Astronomy (2017)

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    Article

    Giant magnetized outflows from the centre of the Milky Way

    Two giant, linearly polarized radio lobes have been found emanating from the Galactic Centre, and are thought to originate in a biconical, star-formation-driven outflow from the Galaxy’s central 200 parsecs th...

    Ettore Carretti, Roland M. Crocker, Lister Staveley-Smith, Marijke Haverkorn… in Nature (2013)

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    Article

    A lower limit of 50 microgauss for the magnetic field near the Galactic Centre

    There is ample evidence of a magnetic field near the centre of our Galaxy, but much uncertainty as to its strength. Estimates vary from the microgauss to the milligauss range — and values as great as 1,000 mic...

    Roland M. Crocker, David I. Jones, Fulvio Melia, Jürgen Ott, Raymond J. Protheroe in Nature (2010)