Zobrazeno 1 - 10
of 62
pro vyhledávání: '"Errani, Raphaël"'
We use analytical and $N$-body methods to study the capture of field stars by gravitating substructures moving across a galactic environment. The majority of stars captured by a substructure move on temporarily-bound orbits that are lost to galactic
Externí odkaz:
http://arxiv.org/abs/2404.19069
Autor:
Rozier, Simon, Errani, Raphaël
Placed slightly out of dynamical equilibrium, an isolated stellar system quickly returns towards a steady virialized state. We study this process of collisionless relaxation using the matrix method of linear response theory. We show that the full pha
Externí odkaz:
http://arxiv.org/abs/2402.03430
Publikováno v:
ApJ 968 89 (2024)
A fundamental prediction of the Lambda Cold Dark Matter (LCDM) cosmology is the centrally divergent cuspy density profile of dark matter haloes. Density cusps render CDM haloes resilient to tides, and protect dwarf galaxies embedded in them from full
Externí odkaz:
http://arxiv.org/abs/2311.14798
Autor:
Smith, Simon E. T., Cerny, William, Hayes, Christian R., Sestito, Federico, Jensen, Jaclyn, McConnachie, Alan W., Geha, Marla, Navarro, Julio, Li, Ting S., Cuillandre, Jean-Charles, Errani, Raphaël, Chambers, Ken, Gwyn, Stephen, Hammer, Francois, Hudson, Michael J., Magnier, Eugene, Martin, Nicolas
We present the discovery of Ursa Major III/UNIONS 1, the least luminous known satellite of the Milky Way, which is estimated to have an absolute V-band magnitude of $+2.2^{+0.4}_{-0.3}$ mag, equivalent to a total stellar mass of 16$^{+6}_{-5}$ M$_{\o
Externí odkaz:
http://arxiv.org/abs/2311.10147
Publikováno v:
ApJ 965 (2024) 20
The recently discovered stellar system Ursa Major III/UNIONS 1 (UMa3/U1) is the faintest known Milky Way satellite to date. With a stellar mass of $16^{+6}_{-5}\,\rm M_\odot$ and a half-light radius of $3\pm1$pc, it is either the darkest galaxy ever
Externí odkaz:
http://arxiv.org/abs/2311.10134
Publikováno v:
MNRAS 519, 384 (2023)
The cuspy central density profiles of cold dark matter (CDM) haloes make them highly resilient to disruption by tides. Self-interactions between dark matter particles, or the cycling of baryons, may result in the formation of a constant-density core
Externí odkaz:
http://arxiv.org/abs/2210.01131
We investigate ways to produce the bifurcation observed in the stellar stream of the Sagittarius dwarf galaxy (Sgr). Our method consists in running $N$-body simulations of Sgr falling into the Milky Way for the last 3~Gyr, with added test particles o
Externí odkaz:
http://arxiv.org/abs/2205.14902
Autor:
Errani, Raphaël, Navarro, Julio F., Ibata, Rodrigo, Martin, Nicolas, Yuan, Zhen, Aguado, David S., Bonifacio, Piercarlo, Caffau, Elisabetta, Hernández, Jonay I. González, Malhan, Khyati, Sánchez-Janssen, Rubén, Sestito, Federico, Starkenburg, Else, Thomas, Guillaume F., Venn, Kim A.
The recently discovered C-19 stellar stream is a collection of kinematically associated metal-poor stars in the halo of the Milky Way lacking an obvious progenitor. The stream spans an arc of ~15 degrees in the sky, and orbit-fitting suggests an apoc
Externí odkaz:
http://arxiv.org/abs/2203.02513
Autor:
Yuan, Zhen, Martin, Nicolas F., Ibata, Rodrigo A., Caffau, Elisabetta, Bonifacio, Piercarlo, Mashonkina, Lyudmila I., Errani, Raphaël, Doliva-Dolinsky, Amandine, Starkenburg, Else, Venn, Kim A., Arentsen, Anke, Aguado, David S., Bellazzini, Michele, Famaey, Benoit, Fouesneau, Morgan, Hernández, Jonay I. González, Jablonka, Pascale, Lardo, Carmela, Malhan, Khyati, Navarro, Julio F., Janssen, Rubén Sánchez, Sestito, Federico, Thomas, Guillaume F., Viswanathan, Akshara, Vitali, Sara
The C-19 stream is the most metal poor stellar system ever discovered, with a mean metallicity $[Fe/H] = -3.38\pm0.06$. Its low metallicity dispersion ($\sigma_{\rm [Fe/H]}$ $<$ 0.18 at the 95\% confidence level) as well as variations in sodium abund
Externí odkaz:
http://arxiv.org/abs/2203.02512
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 512, Issue 4, June 2022, Pages 5247-5257
The unusually low velocity dispersion and large size of Crater II pose a challenge to our understanding of dwarf galaxies in the Lambda Cold Dark Matter (LCDM) cosmogony. The low velocity dispersion suggests either a dark halo mass much lower than th
Externí odkaz:
http://arxiv.org/abs/2112.01540