Published results
“Deep Imaging with Milanković Telescope: Linking merger history to kinematics of elliptical galaxies” by Ivana Ebrová, Michal Bílek, Ana Lalović, Mustafa K. Yıldız, Pierre-Alain Duc, Martin Mašek, and Michael Prouza
A proceedings that follows the presentation at the main periodical event in Serbian astronomy goes in detail in the previous results related to the observation of merger signs in galaxies with prolate rotation. As this study has made a significant use of the largest astronomical facility in Serbia, the Milankovič telescope, this work is highly relevant at the Serbian national scale.
- Proceedings of the XX Serbian Astronomical Conference, October 16-20, 2023, Belgrade, Serbia; Publications of the Astronomical Observatory of Belgrade, vol. 104, pp. 133-138
- Publication date: December 2024
- DOI: 10.69646/aob104p133
- arXiv:2312.05532
- Link: https://www.aob.rs/en/publishing-en/doi/conferences-papers-and-proceedings/774-2024-01-10-69646-aob104p133
“Examining Shell Galaxies in Illustris TNG Simulation with Different Viewing Directions (Illustris TNG Simülasyonundaki Kabuk Gökadaların Farklı Bakış Doğrultularıyla İncelenmesi)” by Tuğba Erol, Mustafa Kürşad Yildiz, Ivana Ebrová, and Michal Bílek
A paper by a Turkish student who worked on the project topics under the supervision of the PI under the EU’s ERASMUS+ mobility program. While there is an English abstract, the full text is available only in Turkish. Using the Illustris TNG50 cosmological simulation, the dependence of the shell radii on the projection of the galaxy relative to the observer was studied. In the simulation, nine different lines of sight were determined for a galaxy and the farthest shell distance in each direction was measured. These measurements were analysed to evaluate the effects of the line of sight on the outermost shell distance. The study reveals how the shell distribution varies with the line of sight.
- Turkish Journal of Astronomy and Astrophysics, Volume: 6 Issue: Special Issue: UAK2024 Proc., 122 - 127
- Publication date: July 2025
- DOI: 10.55064/tjaa.1597370
- Link: https://dergipark.org.tr/en/pub/tjaa/issue/87686/1597370
“Photometric stellar masses for galaxies in DESI Legacy Imaging Surveys” by Ivana Ebrová, Michal Bílek, and Jiří Eliášek
In this work, we aim to find a simple and effective formula to estimate the stellar mass from the images of galaxies delivered by the currently popular DESI Legacy Imaging Surveys. This survey provides an unsurpassed combination of deep imaging and extensive sky coverage in up to four photometric bands. We calibrated the desired formula using a sample of local galaxies observed in the Spitzer Survey of Stellar Structure in Galaxies (S4G), which was specifically dedicated to measuring stellar masses; the resulting formula estimates stellar masses with a scatter of 25 %. We provide a script to automatically download images of any galaxy from the Legacy surveys database, create image masks, generate GALFIT input files with well-assessed initial values, perform GALFIT photometry, and calculate stellar mass estimates. Additionally, we tuned another version of the formula to the magnitudes provided by the Siena Galaxy Atlas 2020 (SGA-2020) with a scatter of 29%. For both our default and SGA-2020 formula, we offer two alternatives derived from different calibrations of S4G masses based on different methods and assumptions.
- Astronomy & Astrophysics
- Publication date: December 2025 (preprint: October 2025)
- DOI: 10.1051/0004-6361/202453448
- arXiv:2510.02257
- Link: https://www.aanda.org/articles/aa/full_html/2025/12/aa53448-24/aa53448-24.html
Galaxy Catalog for Stellar Mass Formula Derivation
We produced a publicly available catalog of photometry and stellar mass estimates of nearby galaxies, processed using our photomass_ls.py script (see below). This dataset accompanies the publication Ebrová, Bílek, & Eliášek (2025) and allows researchers to reproduce our calculations or apply customized stellar-mass calibrations using DESI Legacy Imaging Surveys data.
- Zenodo: https://zenodo.org/uploads/14253993
- Publication date: 2024-12-01 [v1]
- DOI: 10.5281/zenodo.14253993
photomass
Our publicly available Python-based tool (photomass_ls.py) performs photometry of galaxies in DESI Legacy Imaging Surveys using GALFIT and derives stellar-mass estimates from the measured photometry. Stellar mass is a fundamental parameter for understanding the evolution of individual galaxies and of the universe as a whole. Because Legacy Surveys provide deep multi-band imaging over most of the sky, photomass has broad potential for exploitation by the astronomical community, far beyond our project.
- GitHub: https://github.com/PidiGalaxies/photomass
- Zenodo: https://zenodo.org/records/17236667
- Publication date: 10/12/2024 (GitHub), 30/09/2025 (Zenodo)
- DOI: 10.5281/zenodo.17236667
- License: MIT
Publications in preparation:
“Big tidal shells in cosmological simulations” by Ivana Ebrová, Michal Bílek, Elisabeth Sola, Jiří Eliášek, and Pierre-Alain Duc
“Merger history of observed prolate rotators” by Ivana Ebrová and Michal Bílek
Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or European Research Executive Agency (REA). Neither the European Union nor REA can be held responsible for them.