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Physical Sciences and Mathematics Commons™
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Articles 1 - 3 of 3
Full-Text Articles in Physical Sciences and Mathematics
Diverse Stellar Haloes In Nearby Milky Way Mass Disc Galaxies., Benjamin Harmsen, Antonela Monachesi, Eric F. Bell, Roelof S. De Jong, Jeremy Bailin, David J. Radburn-Smith, Benne W. Holwerda
Diverse Stellar Haloes In Nearby Milky Way Mass Disc Galaxies., Benjamin Harmsen, Antonela Monachesi, Eric F. Bell, Roelof S. De Jong, Jeremy Bailin, David J. Radburn-Smith, Benne W. Holwerda
Faculty Scholarship
We have examined the resolved stellar populations at large galactocentric distances along the minor axis (from 10 kpc up to between 40 and 75 kpc), with limited major axis coverage, of six nearby highly inclined MilkyWay (MW) mass disc galaxies using Hubble Space Telescope data from the Galaxy haloes, Outer discs, Substructure, Thick discs, and Star clusters (GHOSTS) survey. We select red giant branch stars to derive stellar halo density profiles. The projected minor axis density profiles can be approximated by power laws with projected slopes of −2 to −3.7 and a diversity of stellar halo masses of 1–6 × …
Galaxy And Mass Assembly (Gama) : Active Galactic Nuclei In Pairs Of Galaxies., Yjan A. Gordon, Matt S. Owers, Kevin A. Pimbblet, Scott M. Croom, Mehmet Alpaslan, Ivan K. Baldry, Sarah Brough, Michael J. I. Brown, Michelle E. Cluver, Christopher J. Conselice, Luke J. M. Davies, Benne W. Holwerda, Andrew M. Hopkins, Madusha L. P. Gunawardhana, Jonathan Loveday, Edward N. Taylor, Lingyu Wang
Galaxy And Mass Assembly (Gama) : Active Galactic Nuclei In Pairs Of Galaxies., Yjan A. Gordon, Matt S. Owers, Kevin A. Pimbblet, Scott M. Croom, Mehmet Alpaslan, Ivan K. Baldry, Sarah Brough, Michael J. I. Brown, Michelle E. Cluver, Christopher J. Conselice, Luke J. M. Davies, Benne W. Holwerda, Andrew M. Hopkins, Madusha L. P. Gunawardhana, Jonathan Loveday, Edward N. Taylor, Lingyu Wang
Faculty Scholarship
There exist conflicting observations on whether or not the environment of broad- and narrow-line active galatic nuclei (AGN) differ and this consequently questions the validity of the AGN unification model. The high spectroscopic completeness of the Galaxy and Mass Assembly (GAMA) survey makes it ideal for a comprehensive analysis of the close environment of galaxies. To exploit this, and conduct a comparative analysis of the environment of broad- and narrow-line AGN within GAMA, we use a double-Gaussian emission line fitting method to model the more complex line profiles associated with broad-line AGN. We select 209 type 1 (i.e. unobscured), 464 …
First Test Of Verlinde’S Theory Of Emergent Gravity Using Weak Gravitational Lensing Measurements., Margot M. Brouwer, Manus R. Visser, Andrej Dvornik, Henk Hoekstra, Konrad Kuijken, Edwin A. Valentijn, Maciej Bilicki, Chris Blake, Sarah Brough, Hugo Buddelmeijer, Thomas Erben, Catherine Heymans, Hendrik Hildebrandt, Benne W. Holwerda, Andrew M. Hopkins, Dominik Klaes, Jochen Liske, Jon Loveday, John Mcfarland, Reiko Nakajima, Cristobal Sifon, Edward N. Taylor
First Test Of Verlinde’S Theory Of Emergent Gravity Using Weak Gravitational Lensing Measurements., Margot M. Brouwer, Manus R. Visser, Andrej Dvornik, Henk Hoekstra, Konrad Kuijken, Edwin A. Valentijn, Maciej Bilicki, Chris Blake, Sarah Brough, Hugo Buddelmeijer, Thomas Erben, Catherine Heymans, Hendrik Hildebrandt, Benne W. Holwerda, Andrew M. Hopkins, Dominik Klaes, Jochen Liske, Jon Loveday, John Mcfarland, Reiko Nakajima, Cristobal Sifon, Edward N. Taylor
Faculty Scholarship
Verlinde proposed that the observed excess gravity in galaxies and clusters is the consequence of emergent gravity (EG). In this theory, the standard gravitational laws are modified on galactic and larger scales due to the displacement of dark energy by baryonic matter. EG gives an estimate of the excess gravity (described as an apparent dark matter density) in terms of the baryonic mass distribution and the Hubble parameter. In this work, we present the first test of EG using weak gravitational lensing, within the regime of validity of the current model. Although there is no direct description of lensing and …