Galaxies and clusters

Galaxies and clusters are the ensembles of stars and other astronomical objects bound together by gravitational forces. Galaxies are ordered into galaxy groups, which are in turn organised into clusters. The Earth is in a galaxy called the Milky Way, which is in the Local Group in the Virgo Supercluster.

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Latest Research and Reviews

  • Research |

    The distance of outflowing gas from the galaxy centre for 915 quasars is found to be typically tens of parsecs. Typical outflow mass rates and energies indicate that these outflows are energetic enough to influence the evolution of their host galaxies.

    • Zhicheng He
    • , Tinggui Wang
    • , Guilin Liu
    • , Huiyuan Wang
    • , Weihao Bian
    • , Kirill Tchernyshyov
    • , Guobin Mou
    • , Youhua Xu
    • , Hongyan Zhou
    • , Richard Green
    •  & Jun Xu
  • Research |

    Simulations of early galaxy formation suggest that the dynamics of structure formation, rather than the Lyman–Werner flux, drives the formation of massive black holes in the early Universe.

    • John H. Wise
    • , John A. Regan
    • , Brian W. O’Shea
    • , Michael L. Norman
    • , Turlough P. Downes
    •  & Hao Xu
    Nature 566, 85-88
  • Research |

    Increased UV–optical nuclear emission in a nearby galaxy together with a spectrum showing emission lines typical of unobscured AGNs and Bowen fluorescence features suggests a longer-term event of intensified accretion onto the central supermassive black hole.

    • Benny Trakhtenbrot
    • , Iair Arcavi
    • , Claudio Ricci
    • , Sandro Tacchella
    • , Daniel Stern
    • , Hagai Netzer
    • , Peter G. Jonker
    • , Assaf Horesh
    • , Julián Esteban Mejía-Restrepo
    • , Griffin Hosseinzadeh
    • , Valentina Hallefors
    • , D. Andrew Howell
    • , Curtis McCully
    • , Mislav Baloković
    • , Marianne Heida
    • , Nikita Kamraj
    • , George Benjamin Lansbury
    • , Łukasz Wyrzykowski
    • , Mariusz Gromadzki
    • , Aleksandra Hamanowicz
    • , S. Bradley Cenko
    • , David J. Sand
    • , Eric Y. Hsiao
    • , Mark M. Phillips
    • , Tiara R. Diamond
    • , Erin Kara
    • , Keith C. Gendreau
    • , Zaven Arzoumanian
    •  & Ron Remillard
  • Research |

    High-angular-resolution observations of the quasar 3C 273 reveal that it has a relatively small but thick disk, viewed nearly face-on, in which material is orbiting the central supermassive black hole.

    • E. Sturm
    • , J. Dexter
    • , O. Pfuhl
    • , M. R. Stock
    • , R. I. Davies
    • , D. Lutz
    • , Y. Clénet
    • , A. Eckart
    • , F. Eisenhauer
    • , R. Genzel
    • , D. Gratadour
    • , S. F. Hönig
    • , M. Kishimoto
    • , S. Lacour
    • , F. Millour
    • , H. Netzer
    • , G. Perrin
    • , B. M. Peterson
    • , P. O. Petrucci
    • , D. Rouan
    • , I. Waisberg
    • , J. Woillez
    • , A. Amorim
    • , W. Brandner
    • , N. M. Förster Schreiber
    • , P. J. V. Garcia
    • , S. Gillessen
    • , T. Ott
    • , T. Paumard
    • , K. Perraut
    • , S. Scheithauer
    • , C. Straubmeier
    • , L. J. Tacconi
    •  & F. Widmann
    Nature 563, 657-660

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