Results 111 to 120 of about 33,866 (165)

A First Look at Galaxy Flyby Interactions: I. Characterizing the Frequency of Flybys in a Cosmological Context

, 2012
Hierarchical structure formation theory is based on the notion that mergers drive galaxy evolution, so a considerable framework of semi-analytic models and N-body simulations has been constructed to calculate how mergers transform a growing galaxy ...
Balogh, Barnes, Behroozi, Behroozi, Bridge, Cox, Dubinski, Genel, Genel, Holley-Bockelmann, Hopkins, Hopkins, Hopkins, Johnston, Kazantzidis, Kelly Holley-Bockelmann, Klypin, Knollmann, Komatsu, Lacey, Laine, Lin, Ludlow, Madau, Maller, Manodeep Sinha, Moore, Naab, Okamoto, Purcell, Robertson, Robertson, Ryan, Sanchis, Sellwood, Sellwood, Sharma, Springel, Tacconi, Taylor, Urrutia, van Dokkum, Vesperini, Wechsler, Weinberg, Weinzirl, Younger   +46 more
core   +2 more sources

CI chondrite Oued Chebeika 002 links asteroids Bennu and Ryugu to common parent body

Meteoritics &Planetary Science, Volume 61, Issue 5, Page 801-818, May 2026.
Abstract CI chondrites are a compositionally primitive group of meteorites that have undergone extensive aqueous alteration, providing insights into the evolution of primitive planetesimals. Oued Chebeika 002 is the most pristine CI chondrite to date.
Megan Broussard, Katharina Lodders, Paul K. Carpenter, Piers Koefoed, Karen Ziegler, Kunihiko Nishiizumi, Marc W. Caffee, Laurence A. J. Garvie, Ryan C. Ogliore, Anthony J. Irving, Bradley L. Jolliff, Kun Wang   +11 more
wiley   +1 more source

Fitting functions for a disk-galaxy model with different LCDM-halo profiles

, 2010
We present an adaptation of the standard scenario of disk-galaxy formation to the concordant LCDM cosmology aimed to derive analytical expressions for the scale length and rotation speed of present-day disks that form within four different ...
Blumenthal, Bryan, Bullock, Burkert, Catinella, Conroy, Courteau, Courteau, Dutton, Einasto, Hammer, Hernquist, J. M. Solanes, Kuzio de Naray, L. Darriba, Lemson, Macciò, Mandelbaum, Masters, Merrit, Mo, Navarro, Peebles, Pizagno, Sales, Shaw, Springob, Wechsler, Zheng, Zwaan   +29 more
core   +1 more source

Ryugu reference project: Recommendations from the measurement definition team

Meteoritics &Planetary Science, Volume 61, Issue 5, Page 819-848, May 2026.
Abstract Sample return missions play a significant role in planetary science by providing pristine extraterrestrial materials. JAXA's Hayabusa2 and NASA's OSIRIS‐REx missions have returned samples from the C‐type asteroids Ryugu and Bennu, respectively. The chemical and mineralogical compositions of these samples closely resemble those of CI chondrites,
Tetsuya Yokoyama, Guillaume Avice, Henner Busemann, Nicolas Dauphas, Daniel P. Glavin, Ashley J. King, Thorsten Kleine, Katharina Lodders, Frederic Moynier, Maria Schönbächler, Yoshinori Takano, Kun Wang, Hikaru Yabuta, Yuma Enokido, Ryota Fukai, Shogo Tachibana, Tomohiro Usui   +16 more
wiley   +1 more source

Describing the Nonuniversal Galaxy Merger Timescales in IllustrisTNG: Effects of Host Halo Mass, Baryons, and Sample Selection

The Astrophysical Journal
Galaxy merger timescales are crucial for understanding and modeling galaxy formation in our hierarchically structured Universe. However, previous studies have reported widely varying dependencies of merger timescales on initial orbital parameters and ...
Kun Xu, Y. P. Jing
doaj   +1 more source

Dark Matter Distribution in Milky Way analog Galaxies

The Astrophysical Journal
Our current understanding of how dark matter (DM) is distributed within the Milky Way (MW) halo, particularly in the solar neighborhood, is based on either careful studies of the local stellar orbits, model assumptions on the global shape of the MW halo,
Natanael G. de Isídio, K. Menéndez-Delmestre, T. S. Gonçalves, M. Grossi, D. C. Rodrigues, N. Garavito-Camargo, A. Araujo-Carvalho, P. P. B. Beaklini, Y. Cavalcante-Coelho, A. Cortesi, L. H. Quiroga-Nuñez, T. Randriamampandry   +11 more
doaj   +1 more source

Ward identities and consistency relations for the large scale structure with multiple species

, 2014
We present fully nonlinear consistency relations for the squeezed bispectrum of Large Scale Structure. These relations hold when the matter component of the Universe is composed of one or more species, and generalize those obtained in Peloso, Pietroni ...
Peloso, Marco, Pietroni, Massimo
core   +1 more source

Halo Substructure Boosts to the Signatures of Dark Matter Annihilation

Galaxies, 2019
The presence of dark matter substructure will boost the signatures of dark matter annihilation. We review recent progress on estimates of this subhalo boost factor—a ratio of the luminosity from annihilation in the subhalos to that originating the ...
Shin’ichiro Ando, Tomoaki Ishiyama, Nagisa Hiroshima   +2 more
doaj   +1 more source

How far do they go? The outer structure of dark matter halos

, 2005
We study the density profiles of collapsed galaxy-size dark matter halos with masses 1e11-5e12 Msun focusing mostly on the halo outer regions from the formal virial radius Rvir up to 5-7Rvir.
Anatoly A. Klypin, Eduardo Simonneau, Francisco Prada, Juan Betancort‐Rijo, Miguel A. Sanchez‐Conde, Reed D., Santiago Patiri, Stefan Gottlober   +7 more
core   +3 more sources

The density profiles of dark matter halos in spiral galaxies

Natural Science, 2012
In spiral galaxies, we explain their non-Keplerian rotation curves (RCs) by means of a non-luminous component embedding their stellar-gaseous disks. Understanding the detailed properties of this component (labelled Dark Matter, DM) is one of the most pressing issues of Cosmology. We investigate the recent relationship (claimed by Walker et al.
Castignani G, Frusciante N, Vernieri D, Salucci, Paolo   +3 more
openaire   +4 more sources