Zobrazeno 1 - 10
of 54
pro vyhledávání: '"Purcell, Chris W."'
Autor:
Villarreal, Antonia S., Zentner, Andrew R., Mao, Yao-Yuan, Purcell, Chris W., Bosch, Frank C. van den, Diemer, Benedikt, Lange, Johannes U., Wang, Kuan, Campbell, Duncan
Publikováno v:
MNRAS, 472, 1088-1105 (2017)
Dark matter halo clustering depends not only on halo mass, but also on other properties such as concentration and shape. This phenomenon is known broadly as assembly bias. We explore the dependence of assembly bias on halo definition, parametrized by
Externí odkaz:
http://arxiv.org/abs/1705.04327
Autor:
Purcell, Chris W.
It is increasingly apparent that common merger events play a large role in the evolution of disk galaxies at all cosmic times, from the wet accretion of gas-filled dwarf galaxies during the era of peak star formation, to the collisions between large,
Externí odkaz:
http://arxiv.org/abs/1402.4519
Autor:
Wang, Mei-Yu, Croft, Rupert A. C., Peter, Annika H. G., Zentner, Andrew R., Purcell, Chris W.
We present an analysis of high-resolution N-body simulations of decaying dark matter cosmologies focusing on the statistical properties of the transmitted Lyman-alpha forest flux in the high-redshift intergalactic medium. In this type of model a dark
Externí odkaz:
http://arxiv.org/abs/1309.7354
Autor:
Purcell, Chris W., Zentner, Andrew R.
Recent kinematical constraints on the internal densities of the Milky Way's dwarf satellites have revealed a discrepancy with the subhalo populations of simulated Galaxy-scale halos in the standard CDM model of hierarchical structure formation. This
Externí odkaz:
http://arxiv.org/abs/1208.4602
Autor:
Gómez, Facundo A., Minchev, Ivan, O'Shea, Brian W., Beers, Timothy C., Bullock, James S., Purcell, Chris W.
Recently, Widrow and collaborators announced the discovery of vertical density waves in the Milky Way disk. Here we investigate a scenario where these waves were induced by the Sagittarius dwarf galaxy as it plunged through the Galaxy. Using numerica
Externí odkaz:
http://arxiv.org/abs/1207.3083
Autor:
Radburn-Smith, David J., Roskar, Rok, Debattista, Victor P., Dalcanton, Julianne J., Streich, David, de Jong, Roelof S., Vlajic, Marija, Holwerda, Benne W., Purcell, Chris W., Dolphin, Andrew E., Zucker, Daniel B.
We analyzed the radial surface brightness profile of the spiral galaxy NGC 7793 using HST/ACS images from the GHOSTS survey and a new HST/WFC3 image across the disk break. We used the photometry of resolved stars to select distinct populations coveri
Externí odkaz:
http://arxiv.org/abs/1206.1057
Publikováno v:
JCAP08(2012)027
We analyze self-consistent N-body simulations of the Milky Way disk and the ongoing disruption of the Sagittarius dwarf satellite to study the effect of Sagittarius tidal debris on dark matter detection experiments. In agreement with significant prev
Externí odkaz:
http://arxiv.org/abs/1203.6617
Autor:
Gómez, Facundo A., Minchev, Ivan, O'Shea, Brian W., Lee, Young Sun, Beers, Timothy C., An, Deokkeun, Bullock, James S., Purcell, Chris W., Villalobos, Álvaro
It is now known that minor mergers are capable of creating structure in the phase-space distribution of their host galaxy's disc. In order to search for such imprints in the Milky Way, we analyse the SEGUE F/G-dwarf and the Schuster et al. (2006) ste
Externí odkaz:
http://arxiv.org/abs/1201.5898
Publikováno v:
Nature, 2011, Vol. 477, No. 7364, pp. 301-303
Like many galaxies of its size, the Milky Way is a disk with prominent spiral arms rooted in a central bar, although our knowledge of its structure and origin is incomplete. Traditional attempts to understand the Galaxy's morphology assume that it ha
Externí odkaz:
http://arxiv.org/abs/1109.2918
Minor accretion events with mass ratio M_sat : M_host ~ 1:10 are common in the context of LCDM cosmology. We use high-resolution simulations of Galaxy-analogue systems to show that these mergers can dynamically eject disk stars into a diffuse light c
Externí odkaz:
http://arxiv.org/abs/0910.5481