Results 171 to 180 of about 115,141 (206)
Extended hot dust emission around the earliest massive quiescent galaxy
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Cosmology and astrophysics with galaxy clusters
AIP Conference Proceedings, 2014Galaxy 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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Nature, 2009
Observations of star clusters in the Milky Way defy the view that the constituents of these systems are almost invariably chemically alike. The outlying clusters could be the tattered relics of once larger systems.
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Observations of star clusters in the Milky Way defy the view that the constituents of these systems are almost invariably chemically alike. The outlying clusters could be the tattered relics of once larger systems.
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Nature, 2015
The enigma of how the most luminous galaxies arise is closer to being solved. New simulations show that these are long-lived massive galaxies powered by prodigious gas infall and the recycling of supernova-driven outflows. See Letter p.496 Due in part to their extreme infrared luminosities, it has ...
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The enigma of how the most luminous galaxies arise is closer to being solved. New simulations show that these are long-lived massive galaxies powered by prodigious gas infall and the recycling of supernova-driven outflows. See Letter p.496 Due in part to their extreme infrared luminosities, it has ...
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Astrophysics in the Next Decade: The Evolution of Galaxies
2009One 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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Cosmology and Astrophysics with Clusters of Galaxies (Invited)
2004I 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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Detailed astrophysical properties of Lyman Break Galaxies
2003A 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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Enhanced cobweb clustering for identifying analog galaxies in astrophysics
2014 IEEE 27th Canadian Conference on Electrical and Computer Engineering (CCECE), 2014Clustering, 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 ...
Viviana Acquaviva, Ashwin Satyanarayana
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