Results 161 to 170 of about 118,995 (201)

Cosmology and astrophysics with galaxy clusters

AIP Conference Proceedings, 2014
Galaxy clusters are the largest gravitationally bound objects in the universe, whose formation is driven by dark energy and dark matter. The majority of the baryonic mass in clusters resides in the hot X-ray emitting plasma, which also leaves imprints in the cosmic microwave background radiation.
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The Molecular Astrophysics of Stars and Galaxies

1998
Abstract This book provides a comprehensive survey of modern molecular astrophysics. It includes an introduction to molecular spectroscopy and then addresses the main areas of current molecular astrophysics, including galaxy formation, star forming regions, mass loss from young as well as highly evolved stars and supernovae, starburst
Thomas W Hartquist, David A Williams
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Enhanced cobweb clustering for identifying analog galaxies in astrophysics

2014 IEEE 27th Canadian Conference on Electrical and Computer Engineering (CCECE), 2014
Clustering, a very popular task in Data Mining, is unsupervised classification of patterns (observations, data items, or feature vectors) into groups (clusters). Clustering has been explored in many different contexts and disciplines. In this paper, we explore using the COBWEB clustering algorithm to identify and group together galaxies whose spectral ...
Ashwin Satyanarayana, Viviana Acquaviva
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The Multifrequency Astrophysics of Galaxy Clusters

Chinese Journal of Astronomy and Astrophysics, 2003
We discuss the evidence and the physical relevance of the astrophysical phenomena (of thermal and non-thermal origin) occurring in galaxy clusters as obtained from multi-frequency observations, from radio to gamma-rays.
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Cosmology and Astrophysics with Clusters of Galaxies (Invited)

2004
I discuss the role that X-ray galaxy clusters plays in the determination of cosmological parameter. In particular I focus the discussion on the evolution of the cluster mass function for the determination of the density parameter Ωm and the normalization of the power spectrum σ8. Available constraints indicate that Ωm lies in the range 0.2–0.5, with σ8
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Astrophysics in the Next Decade: The Evolution of Galaxies

2009
One of the primary goals of observational cosmology is to understand how galaxies form and evolve into the current population of objects we observe around us today. The redshift range, 1.5 ⩽ z ⩽ 3.5 represents a crucial epoch for observing the assembly of the modern galaxy population, which is largely in place by z ∼ 1.
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Systematics and astrophysics: towards an evolutionary classification of galaxies?

2002
It is possible to borrow from a topic of biology called phylogenetic systematics, concepts and tools for a logical and objective classification of galaxies. It is based on observable properties of objects - characters - either qualitative (like morphology) or quantitative (like luminosity, mass or spectrum).
Fraix-Burnet, D., Choler, P., Douzery, Emmanuel   +2 more
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Detailed astrophysical properties of Lyman Break Galaxies

2003
A large statistical sample of z~3 galaxies has been efficiently UV-color-selected, and confirmed spectroscopically. Here we present additional observations providing insight into the physical conditions in these Lyman Break Galaxies (LBGs), selected to be rapidly forming stars when the universe was ~15% of its current age.
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Astrophysics of galaxy clusters and groups with eROSITA

This thesis investigates non-gravitational astrophysical phenomena shaping the physical properties of galaxy clusters and groups. The impact of these processes is constrained by measuring the physical properties of galaxy clusters and groups using X-ray observations of eROSITA.
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Aspects of Cosmic-Ray Astrophysics in the Galaxy and Beyond

1996
We review some salient aspects of cosmic-ray astrophysics. Recent advances are discussed, and several outstanding problems are sketched.
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