Seminars / Webinars
Tuesday 24 April 2024, 12:00 (EET)
Dynamical modelling of barred galaxies
Eugene Vasiliev
Institute of Astronomy, University of Cambridge, UK
Abstract:
I discuss the problem of deprojection and dynamical modelling of barred disc galaxies. First, I review the challenges in inferring the 3d shape from the projected image and in constructing self-consistent dynamical models with complicated geometry. I then introduce an approach for inferring the 3d shape of bars by fitting the photometric data with a parametric family of 3d density models. This method successfully recovers the shape if the bar orientation is known, but has significant degeneracies otherwise. When adding kinematic information and using orbit-superposition dynamical models, one can constrain both the orientation and the pattern speed, even in the challenging edge-on orientation.
Past webinar recordings are available here
Past Webinars
Date | Speaker | Title |
9 April 2024 | Francesco Sylos Labini Enrico Fermi Research Center, Rome, Italy |
Rotation curves of the Milky Way and of external galaxies and a new mass model |
12 March 2024 |
Fransisco Gonzalez Montoya UNAM and University of Leeds |
Normally Hyperbolic Invariant Manifolds in the Stormer problem: A generalization of the Unstable Periodic Orbits and its role in the transport in phase space |
6 February 2024 | Matheus M. A. Paixão Brazilian Center for Research in Physics |
Bohmian Mechanics, chaos, and the Unruh effect |
30 January 2024 | Henrique Santos Lima Brazilian Center for Research in Physics |
First-principle validation of Fourier’s law: a brief study of classical inertial n-vector models |
16 January 2024 | Janusz Mlynarczyk AGH University, Krakow, Poland |
Extremely low frequency electromagnetic waves in the Earth-ionosphere waveguide |
16 January 2024 | A. Burkert Chair of Theoretical and Computational Astrophysics Ludwig Maximilians University, Munich |
The turbulent dynamics of high-redshift disk galaxies |
9 January 2024 | A. Nathanail RCAAM of the Academy of Athens |
Short Gamma-ray bursts as binary neutron star mergers, or not? |
19 December 2023 | I. Contopoulos RCAAM of the Academy of Athens |
Τεχνητή Γενική Νοημοσύνη: Προκλήσεις και Ευκαιρίες |
12 December 2023 | G. Korkidis University of Crete |
A new probe of Cosmology |
28 November 2023 | Johan H. Knapen IAC Tenerife, Spain |
Uncovering galaxy history through deep imaging and machine learning |
21 November 2023 | Sophia Stuber Max-Planck-Institut für Astronomie, Heidelberg, Germany |
Molecular Gas Morphologies in Nearby Main Sequence Galaxies from PHANGS |
7 November 2023 | Jairo Méndez Abreu Universidad de La Laguna/Instituto de Astrofísica de Canarias |
The barred galaxy population in the distant Universe |
31 October 2023 | M. Bureau University of Oxford, UK |
Probing the Invisible: Weighing Supermassive Black Holes with ALMA |
24 October 2023 | S. Hozumi Shiga University, Otsu, Japan |
The origin of the bar properties generated by the bar instability in flat stellar disks |
11 July 2023 | M. Opher Astronomy Department, Boston University, Boston, MA, United States |
The Heliosphere, a case of a Habitable Astrosphere |
29 June 2023 | H. Skokos University of Cape Town, S. Africa |
Numerical approaches for investigating the chaotic behavior of multidimensional Hamiltonian systems |
20 June 2023 | D. Christodoulou University of Massachussets |
A Compendium of Research Projects from the Past Year |
23 May 2023 | K. Founta University of Thessaly |
Modelling and simulating a combat: Battle of Salamis |
16 May 2023 | K. Dialynas Center of Space Research & Technology, Academy of Athens |
The science of large scale heliosphere and missions that made it possible |
9 May 2023 | M. Sormani Universität Heidelberg |
The Galactic centre: structure, dynamics and star formation |
4 Apr 2023 | E. Floratos Academy of Athens |
Arnol'd cat map lattices |
28 Mar 2023 |
P. Erwin Max-Planck-Institute for Extraterrestrial Physics |
Composite Bulges: A Partial Zoology of Beasts that Live at Centers of Galaxy Disks |
9 Mar 2023 | M. Romero-Gomez |
Dynamics with Gaia in the Maggelanic Clouds |
31 Jan 2023 | Athanasios C. Tzemos |
Ergodicity and Born's rule in multiqubit Bohmian systems |
10 Jan 2023 | Tassos Bountis |
Long range interactions enhance stability in 1-D Hamiltonian lattices |
18 Oct 2022 |
Thomas Kotoulas |
Two-parametric families of orbits created by three-dimensional galactic-type potentials |
14 Oct 2022 | George Contopoulos |
(Spirals and bars in galaxies: One-day workshop) The spiral arms of galaxies (29:51) |
14 Oct 2022 | Kanak Saha |
(Spirals and bars in galaxies: One-day workshop) Revisiting spiral structures in galaxies (1:21:30) |
14 Oct 2022 | Lia Athanassoula |
(Spirals and bars in galaxies: One-day workshop) Understanding the Formation and Evolution of Bars using Simulations (2:24:23) |
14 Oct 2022 | Christos Efthymiopoulos |
(Spirals and bars in galaxies: One-day workshop) Manifolds and spirals under multiple pattern speeds (3:41:07) |
14 Oct 2022 | P. Grosbol European Southern Observatory (ESO), Munich, Germany |
(Spirals and bars in galaxies: One-day workshop) Interaction between spirals and bars in disk galaxies (4:33) |
14 Oct 2022 | M. Harsoula Research Center for Astronomy and Applied Mathematics, Academy of Athens |
(Spirals and bars in galaxies: One-day workshop) The building blocks of the spiral arms in galaxies (1:00:15) |
14 Oct 2022 | T. Naab Max-Planck Institut fuer Astrophysik, (MPA), Munich, Germany |
(Spirals and bars in galaxies: One-day workshop) The formation of galactic star cluster populations (1:45:06) |
14 Oct 2022 | P.A. Patsis Research Center for Astronomy and Applied Mathematics, Academy of Athens |
(Spirals and bars in galaxies: One-day workshop) Open questions about the association of observed structures and orbits in galactic disks (2:21:15) |
8 Sep 2022 | Malcolm Hillebrand Department of Mathematics and Applied Mathematics University of Cape Town |
Biophysical chaos: Bubbles in DNA molecules |
20 Jul 2022 | Suraj Dhiwar Prime Minister's Research Scholar, Department of Physics, IIT Guwahati, India |
Star Formation Quenching in L* Ellipticals |
18 Jul 2022 | Samik Mitra Prime Minister's Research Scholar, Department of Physics, IIT Guwahati, India |
Properties of general relativistic magneto-hydrodynamics accretion flows around black holes in steady-state limit (Watch here) |
12 Jul 2022 | Christos Efthymiopoulos University of Padova, Department of Mathematics |
The information approach to the interpretation of quantum mechanics (Watch here) |
5 Jul 2022 | Kanak Saha Inter-University Centre for Astronomy and Astrophysics, Pune, India |
Growth and survival of bars in disk galaxies (Watch here) |
28 Jun 2022 | Georgios Loukes-Gerakopoulos Astronomical Institute of the CAS, Czech Republic |
Celestial Mechanics of Extreme Mass Ratio Inspirals (Watch here) |
14 Jun 2022 | Matthaios Katsanikas Research Center for Astronomy and Applied Mathematics, Academy of Athens |
Stickiness in 3D rotating galactic potentials (Watch here) |
9 Jun 2022 | Makrina Agaoglou Instituto de Ciencias Matematicas, Madrid, Spain |
Transport processes on a Potential Energy Surface with four wells, four index-1 saddles and an index-2 saddle (Watch here) |
24 May 2022 | Susanna Parenti Institut d'Astrophysique Spatiale, France |
Validation of a wave heated 3D MHD coronal-wind model using Polarized Brightness and EUV observations (Watch here) |
17 May 2022 | Konstantina Zouloumi Research Center for Astronomy & Applied Mathematics & Department of Astrophysics, Astronomy and Mechanics, University of Athens |
NAAF determination of the multiple pattern speeds and the manifolds in a simulation of a barred spiral galaxy (Watch here) |
3 May 2022 | Antonios Tsokaros University of Illinois at Urbana-Champaign, USA |
Numerical general relativity and astrophysics in the era of multimessenger astronomy (Watch here) |
18 Apr 2022 | Stavros Pastras Research Center for Astronomy and Applied Mathematics, Academy of Athens & Department of Physics, Section of Astrophysics, Astronomy and Mechanics, University of Athens |
Gasflows in barred spiral galaxies by means of two different hydrocodes (Watch here) |
12 Apr 2022 | Spyridon Aleiferis UK Atomic Energy Authority, Culham Science Centre, Abingdon, UK |
Taming of the stars: how to control fusion plasmas (Watch here) |
31 Mar 2022 | Evangelos Melas University of Athens, Department of Economics |
Asymptotic symmetries and representation theory in General Relativity in three and four space-time dimensions (Watch here) |
29 Mar 2022 | Georgios Doulis Institute of Theoretical Physics, University of Jena, Germany |
Entropy as shock indicator in neutron star merger simulations (Watch here) |
15 Mar 2022 | Dimitris Stamatellos Jeremiah Horrocks Institute for Mathematics, Physics & Astronomy, University of Central Lancashire, Preston, UK |
The formation and evolution of disc-instability planets (Watch here) |
10 Mar 2022 | Damianos Iosifidis Aristotle University of Thessaloniki |
Perfect Hyperfluids (Watch here) |
8 Mar 2022 | Antonios Nathanail University of Athens, Department of Physics |
Still observing light from the binary neutron star merger first detected in 2017 (Watch here) |
3 Mar 2022 | Karnesis Nikolaos Aristotle University of Thessaloniki, School of Physics |
Detecting Gravitational Waves from space (Watch here) |
22 Feb 2022 | Athanasios C. Tzemos Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Chaos and Bohmian Quantum Potential (Watch here) |
15 Feb 2022 | Ioannis Contopoulos Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Quantum Interference: reality or an illusion of the detector? (Watch here) |
8 Feb 2022 | Charis Anastopoulos Department of Physics, University of Patras |
Gravitational effects in macroscopic quantum systems (Watch here) |
1 Feb 2022 | Konstantinos N. Gourgouliatos Department of Physics, University of Patras |
Magnetic Field Evolution in Neutron Star Crusts: Hall effect and beyond ( Watch here) |
18 Jan 2022 | Athanasios C. Tzemos Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Born's rule in the case of 3 entangled Bohmian qubits (Watch here) |
11 Jan 2022 | Constantinos Kalapotharakos University of Maryland and Astrophysics Science Division, NASA/Goddard Space Flight Center, USA |
Interpreting the Thermal and Non-Thermal High-Energy Emission in Multipolar Field Pulsar Magnetospheres (Watch here) |
14 Dec 2021 | Thorsten Naab Max-Planck-Institute for Astrophysics, Garching, Germany |
The GRIFFIN project - towards realistic simulations of galactic star cluster populations (Watch here) |
7 Dec 2021 | Ivan Minchev Leibniz-Institut für Astrophysik Potsdam (AIP) |
Modeling the Galactic disk in the age of Gaia (Watch here) |
30 Nov 2021 | Edoardo Legnaro Research Center for Astronomy and Applied Mathematics of the Academy of Athens and University of Thessaloniki |
Analytic Theory for Secular Lunisolar Resonances (Watch here) |
9 Nov 2021 | Dimitri A. Gadotti ESO – European Southern Observatory |
Nuclear discs in external galaxies and the Milky Way: building "bulges" without mergers (Watch here) |
26 Oct 2021 | Demosthenes Kazanas NASA Goddard Space Flight Center, Corresponding Member of the Academy of Athens |
Gravity beyond Einstein? Yes, but in which direction? (Watch here) |
13 Jul 2021 | Dimitris Christodoulou University of Massachusetts |
Major-Body Clustering in the Solar System (Watch here) |
24 Jun 2021 | Panos A. Patsis Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Building blocks of 3D, X-shaped bulges and thick spirals (Watch here) |
8 Jun 2021 | George Contopoulos Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Μια συνοπτική έκθεση της Φιλοσοφίας της Φυσικής και των Μαθηματικών (Διαθέσιμη μαγνητοσκοπημένη) |
1 Jun 2021 | Christos Efthymiopoulos Department of Mathematics Tullio Levi-Civita, University of Padua (Work in collaboration with Rita Mastroianni) |
Secular dynamics for exoplanetary systems with two planets in mutually inclined orbits (Watch here) |
13 May 2021 | Athanasios C. Tzemos Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Born's Rule in the case of two entangled Bohmian qubits
(Watch here) |
22 Apr 2021 | Costis Gontikakis Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Study of the emission measure during a solar flare observed with IRIS spectrograph (Watch here) |
Seminars in 2020
Date | Speaker | Title |
3 Mar 2020 | Anastasios Anastasiadis National Observatory of Athens / IAASARS |
Unveiling Current Challenges in Space Weather Forecasting: The SAWS-ASPECS tool |
25 Feb 2020 | Vasileios Basios Université Libre de Bruxelles, Interdisciplinary Centre for Nonlinear Phenomena & Complex Systems (Cenoli-ULB) & Département de Physique des Systèmes Complexes et Mécanique Statistique |
Labyrinth Chaos: Conservative, non-Hamiltonian Chaos without Attractors |
18 Feb 2020 | Elias Koulouridis National Observatory of Athens / IAASARS |
Tracing the Universe: X-ray surveys and cosmology |
11 Feb 2020 | Costis Gontikakis Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Moss, the trace of hot loops in EUV, an ongoing research |
28 Jan 2020 | Athanassios C. Tzemos Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Chaos and ergodicity in the trajectories of two entangled Bohmian qubits |
21 Jan 2020 | George Dimopoulos National Observatory of Athens |
Coronal properties of Sy I Active Galaxies |
14 Jan 2020 | Panos A. Patsis Research Center for Astronomy and Applied Mathematics of the Academy of Athens |
Some open issues in Galactic Dynamics and the contribution of Image Processing in resolving them |
A list of all previous seminars from 2008 to 2020 is available here.