Zobrazeno 1 - 10
of 83
pro vyhledávání: '"BILEK, MICHAL"'
Autor:
Bílek, Michal
Publikováno v:
A&A 690, A364 (2024)
If modified gravity holds, but the weak lensing analysis is done in the standard way, one finds that dark matter halos have peculiar shapes, not following the standard Navarro-Frenk-White profiles, and are fully predictable from the distribution of b
Externí odkaz:
http://arxiv.org/abs/2408.02725
Autor:
Saburova, Anna S., Gasymov, Damir, Rubtsov, Evgenii V., Chilingarian, Igor V., Borisov, Sviatoslav, Gerasimov, Ivan, Kolganov, Fedor, Kasparova, Anastasia V., Uklein, Roman I., Bílek, Michal, Grishin, Kirill A., Zasov, Anatoly, Demianenko, Mariia, Katkov, Ivan Yu., Lalović, Ana, Samurović, Srdjan
To understand the origin of extended disks of low-surface brightness (LSB) galaxies, we studied in detail 4 such systems with large disks seen edge-on. Two of them are edge-on giant LSB galaxies (gLSBGs) recently identified by our team. The edge-on o
Externí odkaz:
http://arxiv.org/abs/2407.17548
Autor:
Nagesh, Srikanth T., Freundlich, Jonathan, Famaey, Benoit, Bílek, Michal, Candlish, Graeme, Ibata, Rodrigo, Müller, Oliver
Publikováno v:
A&A 690, A149 (2024)
Ultra-diffuse galaxies (UDGs) in the Coma cluster have velocity dispersion profiles that are in full agreement with the predictions of Modified Newtonian Dynamics (MOND) in isolation. However, the external field effect (EFE) from the cluster seriousl
Externí odkaz:
http://arxiv.org/abs/2407.03413
Early-type galaxies (ETGs, i.e. elliptical and lenticular galaxies) differ in their amount of rotational support -- some are purely supported by velocity dispersion, while others show pronounced ordered rotation. Cosmological hydrodynamical simulatio
Externí odkaz:
http://arxiv.org/abs/2405.04663
Autor:
Ebrová, Ivana, Bílek, Michal, Lalović, Ana, Yıldız, Mustafa K., Duc, Pierre-Alain, Mašek, Martin, Prouza, Michael
Kinematical and morphological features observed in early-type galaxies provide valuable insights into the evolution of their hosts. We studied the origin of prolate rotation (i.e., rotation around the long axis) in Illustris large-scale cosmological
Externí odkaz:
http://arxiv.org/abs/2312.05532
Autor:
Bílek, Michal, Hilker, Michael, Renaud, Florent, Richtler, Tom, Chaturvedi, Avinash, Samurović, Srdjan
Publikováno v:
A&A 682, A111 (2024)
Context. Globular clusters (GCs) carry information about the formation histories and gravitational fields of their host galaxies. B\'ilek et al. (2019, BSR19 hereafter) reported that the radial profiles of the volume number density of GCs in GC syste
Externí odkaz:
http://arxiv.org/abs/2308.08629
Autor:
Bílek, Michal, Zhao, Hongsheng, Famaey, Benoit, Nagesh, Srikanth T., Combes, Françoise, Müller, Oliver, Hilker, Michael, Kroupa, Pavel, Ibata, Rodrigo
The controversy "dark matter vs. modified gravity" constitutes a major topic of discussion. It was proposed that dynamical friction could be used to discriminate between the two alternatives. Analytic calculations indicate that, with modified gravity
Externí odkaz:
http://arxiv.org/abs/2307.03202
Autor:
Bílek, Michal, Hilker, Michael, Renaud, Florent, Richtler, Tom, Chaturvedi, Avinash, Samurović, Srdjan
Dark matter is required in galaxies at galactocentric radii that are larger than the $a_0$-radius, which is where the gravitational acceleration generated by baryons of the galaxy equals the constant $a_0=1.2\times 10^{-10}$ms$^{-2}$ known as the gal
Externí odkaz:
http://arxiv.org/abs/2304.06092
Publikováno v:
A&A 672, A27 (2023)
Context: Early-type galaxies (ETGs) are divided into slow and fast rotators (FRs and SRs) according to the degree of ordered rotation of their stellar populations. Cosmological hydrodynamical simulations indicate that galaxies form as FRs before thei
Externí odkaz:
http://arxiv.org/abs/2210.02478
Autor:
Sola, Elisabeth, Duc, Pierre-Alain, Richards, Felix, Paiement, Adeline, Urbano, Mathias, Klehammer, Julie, Bílek, Michal, Cuillandre, Jean-Charles, Gwyn, Stephen, McConnachie, Alan
Publikováno v:
A&A 662, A124 (2022)
The characterization of Low Surface Brightness (LSB) stellar structures around galaxies such as tidal debris of on-going or past collisions is essential to constrain models of galactic evolution. Our goal is to obtain quantitative measurements of LSB
Externí odkaz:
http://arxiv.org/abs/2203.03973