Zobrazeno 1 - 10
of 135
pro vyhledávání: '"Ghosh, Soumavo"'
Autor:
Ghosh, Soumavo, Gadotti, Dimitri A., Fragkoudi, Francesca, Nagpal, Vighnesh, Di Matteo, Paola, Cuomo, Virginia
The presence of dark gaps, a preferential light deficit along the bar minor axis, is observationally well known. The properties of dark gaps are thought to be associated with the properties of bars, and their spatial locations are often associated wi
Externí odkaz:
http://arxiv.org/abs/2407.15943
Autor:
Boin, Tristan, Di Matteo, Paola, Khoperskov, Sergey, Fragkoudi, Francesca, Ghosh, Soumavo, Combes, Françoise, Haywood, Misha, Katz, David
Previous studies of the chemo-kinematic properties of stars in the Galactic bulge have revealed a puzzling trend. Along the bulge minor axis, and close to the Galactic plane, metal-rich stars display a higher line-of-sight velocity dispersion compare
Externí odkaz:
http://arxiv.org/abs/2407.09799
Autor:
Sardaneta, Minerva M., Amram, Philippe, Rampazzo, Roberto, Rosado, Margarita, Sanchez-Cruces, Monica, Fuentes-Carrera, Isaura, Ghosh, Soumavo
Isolated galaxies are the ideal reference sample to study the galaxy structure minimising potential environmental effects. We selected a complete sample of 14 nearby, late-type, highly inclined ($i\geq80^{\circ}$), isolated galaxies from the Catalogu
Externí odkaz:
http://arxiv.org/abs/2401.02876
Stellar kinematics provide a window into the gravitational field, and therefore into the distribution of all mass, including dark matter. Deep Potential is a method for determining the gravitational potential from a snapshot of stellar positions in p
Externí odkaz:
http://arxiv.org/abs/2310.00040
Boxy/peanut (b/p) bulges, the vertically extended inner parts of bars, are ubiquitous in barred galaxies in the local Universe, including our own Milky Way. At the same time, a majority of external galaxies and the Milky Way also possess a thick-disc
Externí odkaz:
http://arxiv.org/abs/2308.16239
Autor:
Ghosh, Soumavo, Di Matteo, Paola
One of the challenges related to stellar bars is to accurately determine the length of the bar in a disc galaxy. In the literature, a wide variety of methods have been employed to measure the extent of a bar. However, a systematic study on determinin
Externí odkaz:
http://arxiv.org/abs/2308.10948
Publikováno v:
MNRAS, 2023, Volume 523, Issue 1, pp.991-1008
Action-based dynamical modelling, using stars as dynamical tracers, is an excellent diagnostic to estimate the underlying axisymmetric matter distribution of the Milky Way. However, the Milky Way's bar causes non-axisymmetric resonance features in th
Externí odkaz:
http://arxiv.org/abs/2212.06184
Publikováno v:
A&A 674, A128 (2023)
The Milky Way as well as a majority of external galaxies possess a thick disc. However, the dynamical role of the (geometrically) thick disc on the bar formation and evolution is not fully understood. Here, we investigate the effect of thick discs in
Externí odkaz:
http://arxiv.org/abs/2210.14244
Autor:
Khachaturyants, Tigran, Debattista, Victor P., Ghosh, Soumavo, Silva, Leandro Beraldo e, Daniel, Kathryne J.
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters, Volume 517, Issue 1, November 2022, Pages L55-L59
We measure and compare the pattern speeds of vertical breathing, vertical bending, and spiral density waves in two isolated N-body+SPH simulations, using windowed Fourier transforms over 1 Gyr time intervals. We show that the pattern speeds of the br
Externí odkaz:
http://arxiv.org/abs/2210.00341
It is now clear that the stars in the Solar neighbourhood display large-scale coherent vertical breathing motions. At the same time, Milky Way-like galaxies experience tidal interactions with satellites/companions during their evolution. While these
Externí odkaz:
http://arxiv.org/abs/2208.07096