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pro vyhledávání: '"Dehnen A"'
Scouring by supermassive black hole (SMBH) binaries is the most accepted mechanism for the formation of the cores seen in giant elliptical galaxies. However, an additional mechanism is required to explain the largest observed cores. Gravitational wav
Externí odkaz:
http://arxiv.org/abs/2408.12537
Galactic bars are found in the majority of disc galaxies. They rotate nearly rigidly with an angular frequency called pattern speed. Previous idealised simulations have shown that bar pattern speed decreases with time due to dynamical friction exerte
Externí odkaz:
http://arxiv.org/abs/2407.11154
Autor:
Dehnen, Walter, Schönrich, Ralph, Drimmel, Ronald, Chrobáková, Žofia, Poggio, Eloisa, Semczuk, Marcin
Huang et al. (2024) measured the derivative of the phase $\phi_{\mathrm{w}}$ of the Galactic warp traced by classical Cepheids with respect to their age $\tau$ and interpreted it as the warp precession rate $\omega\equiv\mathrm{d}\phi_{\mathrm{w}}/\m
Externí odkaz:
http://arxiv.org/abs/2407.06341
Recent results from pulsar timing arrays (PTAs) show evidence for a gravitational wave background (GWB) consistent with a population of unresolved supermassive black hole (SMBH) binaries (BHBs). While the data do not yet constrain the slope of the sp
Externí odkaz:
http://arxiv.org/abs/2406.02710
The coalescence of the most massive black hole (MBH) binaries releases gravitational waves (GWs) within the detectable frequency range of Pulsar Timing Arrays (PTAs) $(10^{-9} - 10^{-6})$ Hz. The incoherent superposition of GWs from MBH mergers, the
Externí odkaz:
http://arxiv.org/abs/2402.10709
Autor:
Hernandez, David M., Dehnen, Walter
We present new almost time-reversible integrators for solution of planetary systems consisting of "planets" and a dominant mass ("star"). The algorithms can be considered adaptive generalizations of the Wisdom--Holman method, in which all pairs of pl
Externí odkaz:
http://arxiv.org/abs/2401.07113
Publikováno v:
JACS Au, Vol 4, Iss 10, Pp 3788-3799 (2024)
Externí odkaz:
https://doaj.org/article/8d984512eee74395aae8f378dd9373f8
We examine the Galactic warp in a sample of all classical Cepheids with Gaia DR3 radial velocity. In each radial bin, we determine (1) the inclined plane normal to the mean orbital angular momentum of the stars and (2) that best fitting their positio
Externí odkaz:
http://arxiv.org/abs/2305.09343
Autor:
Vasco, Jonathan Link, Stellhorn, Jens Ruediger, Klee, Benjamin Danilo, Paulus, Benedict, Belz, Juergen, Haust, Johannes, Hosokawa, Shinya, Hayakawa, Shinjiro, Volz, Kerstin, León, Iran Rojas, Christmann, Jan, Dehnen, Stefanie, Pilgrim, Wolf-Christian
The microscopic structure of two amorphous materials with extreme nonlinear optical properties has been studied. One of these materials exhibits second harmonic generation, while another material of similar molecular structure emits brilliant white l
Externí odkaz:
http://arxiv.org/abs/2303.00401
Autor:
Ana Novoa, Giovanni Vimercati, Giuseppe Brundu, David M. Richardson, Urs Schaffner, Antonio Brunori, Thomas Campagnaro, Susan Canavan, Laura Celesti‐Grapow, Michele Dechoum, Katharina Dehnen‐Schmutz, Jean‐Marc Dufour‐Dror, Franz Essl, S. Luke Flory, Heinke Jäger, Jasmin Joshi, Marion Karmann, Barbara Langdon, Katharina Lapin, Johannes Le Roux, Vanessa Lozano, Mauro Masiero, Laura A. Meyerson, Martin A. Nuñez, Aníbal Pauchard, Jan Pergl, Annabel J. Porté, Petr Pyšek, Jana Pyšková, Jonatan Rodriguez, Ross T. Shackleton, Joaquim S. Silva, Tommaso Sitzia, Laura Verbrugge, Michaela Vítková, Yitbarek Tibebe Weldesemaet, Marjana Westergren, John R. U. Wilson
Publikováno v:
People and Nature, Vol 6, Iss 4, Pp 1640-1654 (2024)
Abstract A large number of non‐native trees (NNTs) have been introduced globally and widely planted, contributing significantly to the world's economy. Although some of these species present a limited risk of spreading beyond their planting sites,
Externí odkaz:
https://doaj.org/article/447a35aedcae4c07b45fee83decb21f1