Results 151 to 160 of about 97,868 (355)

From Halos to Galaxies. VI. Improved Halo Mass Estimation for SDSS Groups and Measurement of the Halo Mass Function

The Astrophysical Journal
In ΛCDM cosmology, galaxies form and evolve in their host dark matter (DM) halos. Halo mass is crucial for understanding the halo–galaxy connection. The abundance-matching (AM) technique has been widely used to derive the halo masses of galaxy groups ...
Dingyi Zhao, Yingjie Peng, Yipeng Jing, Xiaohu Yang, Luis C. Ho, Alvio Renzini, Anna R. Gallazzi, Cheqiu Lyu, Roberto Maiolino, Jing Dou, Zeyu Gao, Qiusheng Gu, Filippo Mannucci, Houjun Mo, Bitao Wang, Enci Wang, Kai Wang, Yu-Chen Wang, Bingxiao Xu, Feng Yuan, Xingye Zhu   +20 more
doaj   +1 more source

Distribution and Evolution of Metals in the Magneticum Simulations

Galaxies, 2017
Metals are ideal tracers of the baryonic cycle within halos. Their composition is a fossil record connecting the evolution of the various stellar components of galaxies to the interaction with the environment by in- and out-flows.
Klaus Dolag, Emilio Mevius, Rhea-Silvia Remus   +2 more
doaj   +1 more source

Galactic disks and their evolution

, 2010
We consider the key problems related to measuring the mass of stellar disks and dark halos in galaxies and to explaining the observed properties of disks formed in massive dark halos.Comment: 6 pages, 2 ...
A.V. Zasov, Jørgensen, Makarov, Naim, O.K. Sil'chenko, Засов, Засов, Караченцев   +7 more
core   +1 more source

Spatial Dynamics and Lifespan of Adult Cicadas After Fire and Logging: A Radiotracking Study

Integrative Zoology, EarlyView.
This study investigates the effects of wildfire and post‐fire salvage logging on the survival, spatial behavior, and habitat selection of Lyristes plebejus cicadas in Mediterranean pine forests. A total of 63 cicadas were captured, tagged with radio transmitters, and released in three disturbance contexts: burnt‐logged, burnt‐unlogged, and unburnt ...
Carles Tobella, Marc Franch, Josep M. Bas, Lluís Brotons, Pere Pons   +4 more
wiley   +1 more source

Spatially Offset Active Galactic Nuclei in the Very Large Array Sky Survey: Tracers of Galaxy Mergers and Wandering Massive Black Holes

The Astrophysical Journal
The remnants of galaxy mergers may host multiple off-nuclear massive black holes (MBHs), some of which may wander indefinitely within the host galaxy halos. Tracing the population of offset MBHs is essential for understanding how the distribution of MBHs
R. Scott Barrows, Julia M. Comerford
doaj   +1 more source

Response of Fecal Bacteria and Fungi to Tannin‐Rich Diets in Sika Deer (Cervus nippon): Evidence from Both Feeding Experiments and Field Investigations

Integrative Zoology, EarlyView.
Feeding with tannin‐rich diets altered the fecal microbial composition and increased the relative abundance of tannin‐degrading microbes. We hypothesize that fecal bacteria and fungi may play important roles in helping herbivores adapt to tannin‐rich diets but respond to different tannin concentrations varies.
Di Zhu, Feng Wu, Peiying Wen, Haiyang Gao, Xiaoran Hao, Hongfang Wang   +5 more
wiley   +1 more source

Polytropic dark halos of elliptical galaxies

, 2010
The kinematics of stars and planetary nebulae in early type galaxies provide vital clues to the enigmatic physics of their dark matter halos. We fit published data for fourteen such galaxies using a spherical, self-gravitating model with two components: (
Ahn, Arbey, Awaki, Balberg, Balberg, Bento, Bertin, Bertolami, Bertolami, Bilic, Binney, Blumenthal, Bolton, Bruzual, Burkert, Burkert, Böhmer, Cappellari, Chabrier, Ciotti, Coccato, Copin, Curtis J. Saxton, de Blok, de Lorenzi, de Lorenzi, Debattista, Dekel, Diemand, Diemand, Douglas, Dubinski, Dufour, Dunkley, Ferreras, Flores, Gebhardt, Gentile, Gerhard, Gnedin, Gnedin, Gould, Graham, Guo, Humphrey, Ignacio Ferreras, Jardel, Kimura, Kochanek, Koopmans, Kuzio de Naray, Lima Neto, Loewenstein, Mahdavi, Mathews, Merritt, Moore, Moore, Moore, Moster, Márquez, Méndez, Méndez, Napolitano, Navarro, Noordermeer, Nunez, O'Sullivan, Osipkov, Peebles, Plastino, Proctor, Prugniel, Prugniel, Rogers, Romano-Díaz, Romanowsky, Rusin, Sambhus, Saxton, Simon, Spergel, Spolaor, Springel, Statler, Sérsic, Teodorescu, Thomas, Thomas, Tortora, Tsallis, van der Marel, Viala, Viala, Weijmans, Weijmans, Weldrake, Yoshida, Zavala   +98 more
core   +1 more source

Out There No One Has a Right to Die

Bioethics, EarlyView.
ABSTRACT The eventual goal of space exploration is to colonize exoplanets and their moons outside our solar system. This is a dangerous and immoral endeavour. The extraterrestrial life forms encountered would be hostile, vulnerable or both, and the descendants of the original pioneers would be involuntarily exposed to hazardous conditions and ...
Matti Häyry
wiley   +1 more source

Rotation curves velocities obtained by warm low-density plasma simulating dark halos and “dark matter”

AIP Advances
The free electron model with Boltzmann statistics for spherical low-density plasmas is developed further, with asymptotic relations obtaining the density of electrons, mass densities, and the potentials of such plasmas.
Y. Ben-Aryeh
doaj   +1 more source

Detecting Reionization in the Star Formation Histories of High-Redshift Galaxies

, 2007
The reionization of cosmic hydrogen, left over from the big bang, increased its temperature to >~ 1.e4 K. This photo-heating resulted in an increase of the minimum mass of galaxies and hence a suppression of the cosmic star formation rate.
Abraham Loeb, Bardeen, Barkana, Barkana, Barkana, Bond, Bouwens, Cole, Dijkstra, Efstathiou, Eyles, Furlanetto, Gnedin, Gnedin, Haiman, Hui, Jenkins, Kaiser, Kitayama, Kogut, Lacey, Leitherer, Mesinger, Mesinger, Miralda-Escudé, Mo, Mobasher, Navarro, Panagia, Press, Quinn, Rees, Rennan Barkana, Scalo, Sheth, Spergel, Stanway, Stark, Theuns, Thoul, Weinberg, Wyithe, Wyithe, Yan   +43 more
core   +3 more sources