Results 91 to 100 of about 2,825,202 (304)

Usage of the term provenance in LIS literature: An Annual Review of Information Science and Technology (ARIST) paper

Journal of the Association for Information Science and Technology, EarlyView.
Abstract Provenance is the story of how something has come to be. In this paper, we provide a systematic literature review to categorize the various notions of provenance in Information Sciences. The goal of this review is to paint a broader picture of the multiple uses of provenance at play and to enhance our understanding of the importance of ...
Rhiannon Bettivia, Yi‐Yun Cheng, Michael R. Gryk   +2 more
wiley   +1 more source

Star Formation and Galaxy Environment [PDF]

arXiv, 2000
The dependence of star formation rate on galaxian environment is a key issue in the understanding of galaxy formation and evolution. However, the study of this subject is complex and observationally challenging. This paper reviews some of the current results, drawing mostly from recent large redshift surveys such the LCRS, the MORPH collaboration, and ...
arxiv  

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

Formation and Dynamical Evolution of Galaxies and of their Components

AIP Conference Proceedings, 2005
8 pages, 8 figures. Invited review to the Conference on Planetary Nebulae as Astronomical Tools (Gdansk, Poland, 28 June-2 July 2005)
openaire   +3 more sources

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

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

H2 MAGIE: H2 as a Major Agent to Galaxy Interaction and Evolution [PDF]

arXiv, 2010
Spitzer space telescope spectroscopy reveal a new class of H2-luminous galaxies with enhanced H2 line emission, but where star formation is strongly suppressed. This is in sharp contrast with what is observed in standard star forming galaxies. These sources are all in active phases of galaxy evolution (galaxy interactions, AGN feedback, gas accretion ...
arxiv  

On the Age Distribution of Classical Cepheids in the Galaxy

Astronomische Nachrichten, EarlyView.
ABSTRACT We revisit the problem of the positive correlation between age and Galactocentric distance seen in Galactic Classical Cepheids, which at first sight may seem counter‐intuitive in the context of inside‐out galaxy formation. To explain it, we use the Besançon Galaxy Model and a simulation of star particles in the Galactic disc coupled with ...
Friedrich Anders, Chloé Padois, Marc Vilanova Sar, Marcin Semczuk, Marc del Alcázar‐Julià, Francesca Figueras   +5 more
wiley   +1 more source

Evolution of the star formation efficiency in galaxies [PDF]

Proceedings of the International Astronomical Union, 2012
AbstractThe physical and chemical evolution of galaxies is intimately linked to star formation, We present evidence that molecular gas (H2) is transformed into stars more quickly in smaller and/or subsolar metallicity galaxies than in large spirals – which we consider to be equivalent to a star formation efficiency (SFE).
openaire   +3 more sources