Zobrazeno 1 - 10
of 758
pro vyhledávání: '"Knapen, Johan"'
Autor:
Amiri, Amirnezam, Knapen, Johan H., Comerón, Sébastien, Marconi, Alessandro, Lehmer, Bret. D.
Metallicity measurements in galaxies can give valuable clues about galaxy evolution. One of the mechanisms postulated for metallicity redistribution in galaxies is gas flows induced by AGN, but the details of this process remain elusive. We report th
Externí odkaz:
http://arxiv.org/abs/2407.12158
Autor:
Iglesias-Navarro, Patricia, Huertas-Company, Marc, Martín-Navarro, Ignacio, Knapen, Johan H., Pernet, Emilie
Publikováno v:
A&A 689, A58 (2024)
High-resolution galaxy spectra encode information about the stellar populations within galaxies. The properties of the stars, such as their ages, masses, and metallicities, provide insights into the underlying physical processes that drive the growth
Externí odkaz:
http://arxiv.org/abs/2406.18661
Autor:
McCall, Callum, Jermak, Helen E., Steele, Iain A., Kobayashi, Shiho, Knapen, Johan H., Sánchez-Alarcón, Pablo M.
Blazars are a highly variable subclass of active galactic nuclei that have been observed to vary significantly during a single night. This intranight variability remains a debated phenomenon, with various mechanisms proposed to explain the behaviour
Externí odkaz:
http://arxiv.org/abs/2402.00633
Autor:
Eskandarlou, Sepideh, Akhlaghi, Mohammad, Infante-Sainz, Raúl, Saremi, Elham, Raji, Samane, Sharbaf, Zahra, Golini, Giulia, Ghaffari, Zohreh, Knapen, Johan H.
Calibration of pixel values is a fundamental step for accurate measurements in astronomical imaging. In astronomical jargon this is known as estimating zero point magnitude. Here, we introduce a newly added script in GNU Astronomy Utilities (Gnuastro
Externí odkaz:
http://arxiv.org/abs/2312.04263
Autor:
Menéndez-Delmestre, Karín, Gonçalves, Thiago S., Sheth, Kartik, de Lima, Tomás Düringer Jacques, Kim, Taehyun, Gadotti, Dimitri A., Schinnerer, Eva, Athanassoula, E., Bosma, Albert, Elmegreen, Debra Meloy, Knapen, Johan H., Machado, Rubens E. G., Salo, Heikki
The redshift evolution of bars is an important signpost of the dynamic maturity of disk galaxies. To characterize the intrinsic evolution safe from band-shifting effects, it is necessary to gauge how bar properties vary locally as a function of wavel
Externí odkaz:
http://arxiv.org/abs/2312.04545
Autor:
Martinez-Lombilla, Cristina, Infante-Sainz, Raul, Jimenez-Ibarra, Felipe, Knapen, Johan H., Trujillo, Ignacio, Comeron, Sebastien, Borlaff, Alejandro S., Roman, Javier
Publikováno v:
A&A 678, A62 (2023)
Context: The hierarchical model of galaxy formation suggests that galaxies are continuously growing. However, our position inside the Milky Way prevents us from studying the disk edge. Truncations are low surface brightness features located in the di
Externí odkaz:
http://arxiv.org/abs/2307.01106
Autor:
Montes, Mireia, Annibali, Francesca, Bellazzini, Michele, Borlaff, Alejandro S., Brough, Sarah, Buitrago, Fernando, Chamba, Nushkia, Collins, Chris, Dell'Antonio, Ian, Escala, Ivanna, Gonzalez, Anthony H., Holwerda, Benne, Kaviraj, Sugata, Knapen, Johan, Koekemoer, Anton, Laine, Seppo, Marcum, Pamela, Martin, Garreth, Martinez-Delgado, David, Mihos, Chris, Ricotti, Massimo, Trujillo, Ignacio, Watkins, Aaron E.
One of the last remaining frontiers in optical/near-infrared observational astronomy is the low surface brightness regime (LSB, V-band surface brightness, $\mu_V>$ 27 AB mag/arcsec$^2$). These are the structures at very low stellar surface densities,
Externí odkaz:
http://arxiv.org/abs/2306.09414
Reliable tools to extract patterns from high-dimensionality spaces are becoming more necessary as astronomical datasets increase both in volume and complexity. Contrastive Learning is a self-supervised machine learning algorithm that extracts informa
Externí odkaz:
http://arxiv.org/abs/2306.05528
Autor:
Román, Javier, Rich, R. Michael, Ahvazi, Niusha, Sales, Laura, Li, Chester, Golini, Giulia, Trujillo, Ignacio, Knapen, Johan H., Peletier, Reynier F., Sánchez-Alarcón, Pablo M.
Publikováno v:
A&A 679, A157 (2023)
The study of dynamically cold stellar streams reveals information about the gravitational potential where they reside and provides important constraints on dark matter properties. However, their intrinsic faintness makes detection beyond Local enviro
Externí odkaz:
http://arxiv.org/abs/2305.03073
Autor:
Namumba, Brenda, Román, Javier, Barroso, Jesus Falcon, Knapen, Johan H., Roger, Ianjamasimanana, Naluminsa, Elizabeth, Jozsa, Gyula I. G., Korsaga, Marie, Maddox, Natasha, Frank, Brad, Sikhosana, Sinenhlanhla, Legodi, Samuel, Carignan, Claude, Ponomareva, Anastasia A., Jarrett, Tom, Lucero, Danielle, Smirnov, Oleg M., van der Hulst, Thijs, Pisano, D. J., Malek, kasia, Marchetti, Lucia, Vaccari, Mattia, Jarvis, Matt, Baes, Maarten, Meyer, Martin, Adams, Elizabeth A. K., Delhaize, Jacinta, Chen, Hao, Rajohnson, Sambatriniaina, Kurapati, Sushma, Heywood, Ian, Verdes-Montenegro, Lourdes
The transformation and evolution of a galaxy is strongly influenced by interactions with its environment. Neutral hydrogen (\HI) is an excellent way to trace these interactions. Here, we present \HI\ observations of the spiral galaxy NGC~895, which w
Externí odkaz:
http://arxiv.org/abs/2303.09371