Seminarium Ogólne 2025
najbliższe | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017
Seminarium odbywa się w Piwnicach w sali wykładowej budynku Radioastronomii. Początek o godzinie 11.15.
Udział w seminarium w trybie zdalnym za pośrednictwem BigBlueButton (BBB).
13 stycznia 2025
“Progenitors of LGRBs: Are single stars enough?”
mgr Rafia Sarwar (Instytut Astronomii, Uniwersytet Mikołaja Kopernika)
Streszczenie:
Stars more massive than 8 M☉ are ignited by nuclear-burning processes of chemical elements in their interiors until the formation of the carbon-oxygen core that marks the end of their life cycle. The final fate of evolved massive stars is classically linked to energetic and luminous transient sources: long-duration gamma-ray bursts (LGRBs). I present the revised and expanded single-star models using MESA and new observational comparisons in this work. My study demonstrates the impact of rotation during the evolution of these stars, leading to chemically homogeneous evolution followed by various types of supernova explosions. I also compare these theoretical models with the observed number of LGRBs to date with known redshifts. The comparison reveals that the updated massive-star physics can explain the observed distribution more fairly than previous studies, primarily due to the way mass loss from stellar winds is treated during evolution.
20 stycznia 2025
“Red novae and their remnants: how stars merge and what is the outcome”
dr hab. Tomasz Kamiński, prof. CAMK (Centrum Astronomiczne im. M. Kopernika PAN, Toruń)
Streszczenie:
Red novae are transient events powered by stellar collisions of normal (non-compact) stars. I am going to summarize recent advancements in red nova observations and in modelling of stellar mergers. For instance, I am going to briefly discuss how observations of circumstellar matter help us to identify the mechanisms that lead to a collision and fast coalescence. I am going to mention future prospects of observing red novae with LSST-Rubin and what consequences they may have. Finally, I am going to present my future project to observe the radioactive nuclide of 26Al in merger remnants and in other objects.
27 stycznia 2025
“Playing hide and seek with galaxies”
dr hab. Katarzyna Małek, prof. NCBJ (Zakład Astrofizyki, Narodowe Centrum Badań Jądrowych, Warszawa)
Streszczenie:
What is the nature of low surface brightness (LSB) galaxies? How many types of LSB galaxies exist, and how do they relate to the global mass distribution in our Universe? Furthermore, how can these galaxies be identified in existing surveys, as we now prepare for the Vera C. Rubin Legacy Survey of Space and Time, which will detect a significant number of LSB galaxies, but only in optical bands? I will present a selection of new results from our research group, including insights into their potential dust content and clustering properties, which highlight the complexity of this topic and pave the way for new discoveries.
3 lutego 2025
“Exploring blazar flares with threshold autoregressive models and spectral energy distribution modeling”
mgr Klaudia Kowalczyk (Instytut Astronomii, Uniwersytet Mikołaja Kopernika)
Streszczenie:
Blazars are a unique class of active galactic nuclei (AGNs) hosting relativistic jets pointing almost directly at the observer. They are known to be highly variable sources in all energy bands, from radio waves to very high-energy gamma rays, where they exhibit powerful flares. Their variability is assumed to originate in the jet. By modeling blazars’ spectral energy distribution (SED), we can study the innermost non-visible parts of blazars. I will present a novel method of differentiating quiescent states from flares in blazar gamma-ray light curves using the self-exciting threshold autoregressive (SETAR) model. I will also show the preliminary results of modeling blazar SEDs and linking the obtained physical parameters to different states of blazars.
24 lutego 2025
“On the Polish In-kind program to the Rubin-LSST project”
dr hab. Paweł Pietrukowicz, prof. UW (Obserwatorium Astronomiczne Uniwersytetu Warszawskiego, Warszawa)
Streszczenie:
The Vera C. Rubin Observatory Legacy Survey of Space and Time (Rubin-LSST) will receive the first light this year. The first data release is expected in 2026. Poland participates in the survey through the In-kind program, which includes constructing and servicing an Independent Data Access Center (IDAC) accompanied by software development and providing associated derived data products. I will describe the survey and the Polish contribution to the Rubin-LSST in details.
3 marca 2025
“How can genome mining from space-dwelling bacteria help us colonize other planets?”
dr Łukasz Szydłowski (Sano Centrum Obliczeniowej Medycyny Spersonalizowanej, Kraków)
Streszczenie:
In the vastness of space, where radiation from stars like the Sun is lethal and darkness is almost absolute, the existence of life seems impossible. Yet, there are organisms that have learned to cope with these conditions. A team of researchers from Poland and Turkey, in close collaboration with partners from NASA’s Jet Propulsion Laboratory has conducted research on how microorganisms adapt to the extreme conditions in space. As a result, a groundbreaking scientific paper titled “Adaptation to space conditions of novel bacterial species isolated from the International Space Station revealed by functional gene annotations and comparative genome analysis” has been published in the prestigious journal Microbiome. The authors of the publication examined the adaptive mechanisms of bacteria collected from the ISS. The findings indicate that microorganisms isolated from inside the ISS have adapted to life in outer space.
Promising Directions in the Development of New Antibiotics.
Discoveries in space genomics are possible thanks to tools using deep machine learning for functional annotations. The genomes of bacteria found on the ISS contain genes for antibiotic resistance and biofilm formation, as well as potential new antimicrobial compounds. This discovery could lead to the development of new drugs that will have applications in both space missions and on Earth. Thanks to this research, we can not only improve the health of astronauts in difficult space conditions but also create innovative therapies for people that will help fight treatment-resistant infections and support the development of new strategies for treating infectious diseases.
Potatoes on Mars and Medicines from Space.
AstroFarms, a company founded by Dr. Łukasz Szydłowski, is one of the most innovative projects aimed at transferring agriculture beyond Earth. AstroFarms is developing the cultivation of adapted potato varieties on lunar and Martian simulators, creating the foundations for future agriculture on other planets. The company is also working on developing microorganisms that will enable the bioproduction of many important substances: pharmaceuticals, polymers, biofuels, etc. This solution aims to ensure self-sufficiency for future space inhabitants, reduce dependence on Earth’s resources, shorten the supply chain, and expand research to other celestial bodies. The use of microorganisms as biofactories to provide optimal nutrition may concern not only future inhabitants of space stations but also people on Earth, where comprehensive nutrition and disease prevention is one of humanity’s challenges.
10 marca 2025
“University of Zielona Gora (Remote) Observatory – current state and planned development”
dr Michał Żejmo (Instytut Astronomii im. Janusza Gila, Uniwersytet Zielonogórski)
Streszczenie:
In 2021, the Janusz Gil Institute of Astronomy, University of Zielona Gora was equipped with a system consisting of two telescopes – a main telescope of CDK design with a diameter of 20 inches and an auxiliary telescope of RASA design with a diameter of 11 inches. The two telescopes form a single system for both deep space observations and observations related to the Space Surveillance and Tracking (SST). The system was tested in Spain for a year, then transported to the hosting site in Chile.
In my presentation, I will discuss the experience of using the system, its involvement and achievements in scientific projects, its application in student education and the popularisation of astronomy, as well as future plans to expand the system with new telescopes and create a Remote Observatory of the University of Zielona Góra.