Results 111 to 120 of about 157,333 (319)

Redshift‐Agnostic Machine Learning Classification: Unveiling Peak Performance in Galaxy, Star, and Quasar Classification (Using SDSS DR17)

Astronomische Nachrichten, EarlyView.
ABSTRACT Classification of galaxies, stars, and quasars using spectral data is fundamental to astronomy, but often relies heavily on redshift. This study evaluates the performance of 10 machine learning algorithms on SDSS data to classify these objects, with a particular focus on scenarios where redshift information is unavailable.
Debashis Chatterjee, Prithwish Ghosh
wiley   +1 more source

Analysis of the Principle and Simulations for Galaxy Formation

Highlights in Science Engineering and Technology
As a matter of fact, the limit to technological advancements seems endless. With the recent launch of the James Webb Space Telescope, cosmological observation has become clearer than ever, allowing us to look deeper into the past.
Yuchen Liu, Yi Ren
semanticscholar   +1 more source

Exploring Dark Photon Production and Kinetic Mixing Constraints in Heavy‐Ion Collisions

Astronomische Nachrichten, EarlyView.
ABSTRACT Vector U‐bosons, often referred to as “dark photons,” are potential candidates for mediating dark matter interactions. In this study, we outline a procedure to derive theoretical constraints on the upper bound of the kinetic mixing parameter ϵ2MU$$ {\upvarepsilon}^2\left({M}_U\right) $$ using dilepton data from heavy‐ion from SIS to RHIC ...
Adrian William Romero Jorge, Elena Bratkovskaya, Taesoo Song, Laura Sagunski   +3 more
wiley   +1 more source

Luminosity function of binary X-ray sources calculated using the Scenario Machine

, 2007
Using the ``Scenario Machine'' we have carried out a population synthesis of X-ray binaries for the purpose of modelling of X-ray luminosity functions (XLFs) in different types of galaxies: star burst, spiral, and elliptical. This computer code allows to
A. Georgakakis, A. I. Bogomazov, A. I. Bogomazov, A. K. H. Kong, A. M. Cherepashchuk, A. R. King, A. Zezas, A. Zezas, D.-W. Kim, E. P. J. Heuvel van den, H.-J. Grimm, H.-J. Grimm, I. Georgantopoulos, J. Bever Van, J. E. Grindlay, K. A. Postnov, K. Belczynski, M. Gilfanov, M. P. Muno, N. V. Raguzova, Q. Z. Liu, Q. Z. Liu, S. A. Rappaport, S. B. Popov, S. V. Karpov, V. M. Lipunov, V. M. Lipunov, V. M. Lipunov, V. M. Lipunov, V. M. Lipunov, V. M. Lipunov, V. M. Lipunov, V. M. Lipunov   +32 more
core   +1 more source

A Slowly Pulsating Run‐Away B Star at High Galactic Latitude Ejected From a Spiral Arm

Astronomische Nachrichten, EarlyView.
ABSTRACT We report the discovery of the young B6 V run‐away star LAMOST J083323.18 + 430825.4, 2.5 kpc above the Galactic plane. Its atmospheric parameters and chemical composition are determined from LAMOST spectra, indicating normal composition. Effective temperature (Teff$$ {T}_{\mathrm{eff}} $$ = 14,500$$ \mathrm{14,500} $$ K) and gravity (logg ...
Ulrich Heber, Maximilian Halenke, Aakash Bhat, Veronika Schaffenroth   +3 more
wiley   +1 more source

Young star clusters: Clues to galaxy formation and evolution [PDF]

, 2003
Young clusters are observed to form in a variety of interacting galaxies and violent starbursts, a substantial number resembling the progenitors of the well-studied globular clusters in mass and size.
P. Anders, U. F. Alvensleben, R. D. G. U. Goettingen, D. PhysicsAstronomy, U. Sheffield   +4 more
semanticscholar   +1 more source

Staphylococcus Aureus AgrA Modulators from South African Antimicrobial Plants.

Chemistry &Biodiversity, Accepted Article.
South African plants are an underutilized metabolites source for novel antimicrobials targeting key quorum sensing (QS) systems like the Staphylococcus aureus AgrA. AgrA modulating metabolites constitute a new approach to reducing resistance development.
Christiana Eleojo Aruwa, Saheed Sabiu
wiley   +1 more source

Modeling the JWST High-redshift Galaxies with a General Formation Scenario and the Consistency with the ΛCDM Model

The Astrophysical Journal Letters, 2023
Early results from the James Webb Space Telescope (JWST) observations have hinted at two traces beyond the standard cosmological framework. One is the extraordinarily high stellar masses and their density at z = 7.5 ∼ 9.1; another is the unexpected ...
Yi-Ying Wang, Lei Lei, Guan-Wen Yuan, Yi-Zhong Fan   +3 more
doaj   +1 more source

Characterization of the Cubamyces menziesii terpenome

ChemBioChem, Accepted Article.
Long‐lasting polypore fungi are significant producers of terpene cyclases of high interest for medicinal or biotechnological applications. Following the 1,000 Fungal Genomes initiative launched by the Joint Genome Institute, we explored the genome of Cubamyces (C.) menziesii and identified eighteen genes encoding sesquiterpene cyclases. In a search for
Gilles Iacazio, Létitia Leydet, Julie Couillaud, Agnès Amouric, Elise Courvoisier-Dezort, Carole Avesque, Thierry Giardina, Mireille Attolini, Pierre Rousselot-Paillet, Katia Duquesne, Marie-Noelle Rosso   +10 more
wiley   +1 more source

AEOS: Star-by-star Cosmological Simulations of Early Chemical Enrichment and Galaxy Formation

The Astrophysical Journal
The A eos project introduces a series of high-resolution cosmological simulations that model star-by-star chemical enrichment and galaxy formation in the early Universe, achieving 1 pc resolution.
Kaley Brauer, Andrew Emerick, Jennifer Mead, Alexander P. Ji, John H. Wise, Greg L. Bryan, Mordecai-Mark Mac Low, Benoit Côté, Eric P. Andersson, Anna Frebel   +9 more
doaj   +1 more source