Now showing items 1-7 of 7

  • Anomalous motions in the Local Group : evidence of a past Milky Way–Andromeda flyby? 

    Banik, Indranil; Zhao, Hongsheng (2016-05-26) - Conference paper
    The expansion of the Universe is not homogeneous. In the Local Group (LG), Andromeda (M31) is approaching the Milky Way (MW) at ~110 km/s. To turn around the cosmic expansion locally to this extent, their combined mass ...
  • Dynamical history of the Local Group in ΛCDM 

    Banik, Indranil; Zhao, Hongsheng (2016-06-21) - Journal article
    The positions and velocities of galaxies in the Local Group (LG) measure the gravitational field within it. This is mostly due to the Milky Way (MW) and Andromeda (M31). We constrain their masses using distance and radial ...
  • Dynamical history of the Local Group in ΛCDM II − including external perturbers In 3D 

    Banik, Indranil; Zhao, Hongsheng (2017-05) - Journal article
    We attempt to fit the observed radial velocities (RVs) of ~30 Local Group (LG) galaxies using a 3D dynamical model of it and its immediate environment within the context of the standard cosmological paradigm, ΛCDM. This ...
  • Effects of lens motion and uneven magnification on image spectra 

    Banik, Indranil; Zhao, Hongsheng (2015-07-01) - Journal article
    Counter to intuition, the images of an extended galaxy lensed by a moving galaxy cluster should have slightly different spectra in any metric gravity theory. This is mainly for two reasons. One relies on the gravitational ...
  • The escape velocity curve of the Milky Way in Modified Newtonian dynamics 

    Banik, Indranil; Zhao, Hongsheng (2018-01) - Journal article
    We determine the escape velocity from the Milky Way (MW) at a range of Galactocentric radii in the context of Modified Newtonian Dynamics (MOND). Due to its non-linear nature, escape is possible if the MW is considered ...
  • A plane of high velocity galaxies across the Local Group 

    Banik, Indranil; Zhao, Hongsheng (2017-10-04) - Journal article
    We recently showed that several Local Group (LG) galaxies have much higher radial velocities (RVs) than predicted by a 3D dynamical model of the standard cosmological paradigm. Here, we show that 6 of these 7 galaxies ...
  • Snowball Earth 

    Banik, Indranil (2016-08-25) - Journal article
    In the ongoing quest to better understand where life may exist elsewhere in the Universe, important lessons may be gained from our own planet. In particular, much can be learned from planetary glaciation events that Earth ...