Results 21 to 30 of about 72,995 (112)

Enhanced accretion rates of stars on Super-massive Black Holes by star-disk interactions in galactic nuclei

, 2012
We investigate the dynamical interaction of a central star cluster surrounding a super-massive black hole and a central accretion disk. The dissipative force acting on stars in the disk leads to an enhanced mass flow towards the super-massive black hole ...
Andreas Just, Baruteau, Begelman, Binney, Bisnovatyi-Kogan, Bisnovatyi-Kogan, Callegari, Callegari, Chingis Omarov, Denis Yurin, Emmanuil Y. Vilkoviskij, Frank, Gillessen, Gültekin, Kasen, Langbein, Li, Maxim Makukov, Miralda-Escudé, Murphy, Novikov, Ostriker, Park, Peter Berczik, Rainer Spurzem, Rauch, Rauch, Shakura, Spitzer, Syer, Vilkoviskij, Vilkoviskij, Vilkoviskij, Šubr   +33 more
core   +1 more source

Coastal Blue Carbon Opportunity Assessment for Snohomish Estuary: The Climate Benefits of Estuary Restoration [PDF]

, 2014
This report presents the findings of a groundbreaking study that confirms the climate mitigation benefits of restoring tidal wetland habitat in the Snohomish Estuary, located within the nation's second largest estuary: Puget Sound.
Danielle L. Devier, John Rybczyk, Katrina Poppe, Keeley O'Connell, Steve Crooks, Steve Emmett-Mattox   +5 more
core  

Evolution of growing black holes in axisymmetric galaxy cores

, 2011
NBody realizations of axisymmetric collisional galaxy cores (e.g. M32, M33, NGC205, Milky Way) with embedded growing black holes are presented. Stars which approach the disruption sphere are disrupted and accreted to the black hole.
Berczik, Peter, Fiestas, Jose, Porth, Oliver, Spurzem, Rainer   +3 more
core   +1 more source

On the Influence of Minor Mergers on the Radial Abundance Gradient in Disks of Milky Way-like Galaxies

, 2015
We investigate the influence of stellar migration caused by minor mergers (mass ratio from 1:70 to 1:8) on the radial distribution of chemical abundances in the disks of Milky Way-like galaxies during the last four Gyr.
Berczik, Peter, Grebel, Eva K., Just, Andreas, Pilyugin, Leonid S., Zinchenko, Igor A.   +4 more
core   +1 more source

The Accretion Disc Particle Method for Simulations of Black Hole Feeding and Feedback [PDF]

, 2010
Black holes grow by accreting matter from their surroundings. However, angular momentum provides an efficient natural barrier to accretion and so only the lowest angular momentum material will be available to feed the black holes. The standard sub-grid model for black hole accretion in galaxy formation simulations - based on the Bondi-Hoyle method ...
arxiv   +1 more source

SMBH in Galactic Nuclei with Tidal Disruption of Stars

, 2014
Tidal Disruption of stars by super massive central black holes from dense star clusters is modeled by high-accuracy direct $N$-body simulation. The time evolution of the stellar tidal disruption rate, the effect of tidal disruption on the stellar density
Berczik, Peter, Spurzem, Rainer, Zhong, Shiyan   +2 more
core   +1 more source

Star Formation from Galaxies to Globules [PDF]

, 2002
The empirical laws of star formation suggest that galactic-scale gravity is involved, but they do not identify the actual triggering mechanisms for clusters in the final stages.
Aalto S., Battinelli P., Battinelli P., Battinelli P., Battinelli P., Bruce G. Elmegreen, Buat V., Comeron F., Coppin K. E. K., Crovisier J., de Geus E. J., Deul E. R., Dickey J. M., Doroshkevich A. G., Dutrey A., Elmegreen B. G., Elmegreen B. G., Elphick C., Falgarone E., Feitzinger J. V., Gallagher J. S., Gerritsen J. P. E., Goldreich P., Goudis C., Green D. A., Guiderdoni B., Heithausen A., Huttemeister S., Inoue A. K., Kimura T., Kuno N., Larson R. B., Larson R. B., Lazarian A., Lequeux J., Lubow S. H., Madore B. F., Mao R. Q., Marx-Zimmer M., Motte F., Padoan P., Sancisi R., Semelin B., Sleath J. P., Stutzki J., Tenjes P., Vader J. P., Yamaguchi R., Yamaguchi R., Yamaguchi R., Zielinsky M.   +50 more
core   +2 more sources

Quantitative earnings enhancement from share buybacks [PDF]

arXiv, 2019
This paper aims to explore the mechanical effect of a company's share repurchase on earnings per share (EPS). In particular, while a share repurchase scheme will reduce the overall number of shares, suggesting that the EPS may increase, clearly the expenditure will reduce the net earnings of a company, introducing a trade-off between these competing ...
arxiv  

The Radiative Efficiency of Hot Accretion Flows [PDF]

, 2012
Two significant progresses have been made in the past years on our understanding of hot accretion flows. One is that only a small fraction of accretion flow available at the outer boundary can finally falls onto the black hole while most of them is lost in outflow.
arxiv   +1 more source

Supermassive Black Holes in Galactic Nuclei with Tidal Disruption of Stars: Paper II - Axisymmetric Nuclei

, 2015
Tidal Disruption of stars by supermassive central black holes from dense rotating star clusters is modelled by high-accuracy direct N-body simulation.
Berczik, Peter, Spurzem, Rainer, Zhong, Shiyan   +2 more
core   +1 more source