Results 21 to 30 of about 830 (187)
Detector system challenges of the wide‐field spectroscopic survey telescope (WST)
Astronomische Nachrichten, Volume 344, Issue 8-9, October-November 2023., 2023 Abstract The wide‐field spectroscopic survey telescope (WST) is proposed to become the next large optical/near infrared facility for the European southern observatory (ESO) once the extremely large telescope (ELT) has become operational. While the latter is optimized for unprecedented sensitivity and adaptive‐optics assisted image quality over a small ...
Roland Bacon +4 more
wiley +1 more source
Reionization in Technicolor [PDF]
Monthly Notices of the Royal Astronomical Society, 2018 24 pages, 17 figures, accepted to ...
Kristian Finlator +4 more
openaire +3 more sources
Journal of Geophysical Research: Space Physics, Volume 128, Issue 10, October 2023., 2023 Abstract We analyze the emission of energetic neutral atom (ENA) flux from charge exchange between Jovian magnetospheric ions and the atmospheres of Callisto and Europa. For this purpose, we combine the draped electromagnetic fields from a hybrid plasma model with a particle tracing tool for the energetic ions.
C. Michael Haynes +5 more
wiley +1 more source
Cosmological reionization [PDF]
Philosophical Transactions of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 2000 In popular cosmological scenarios, some time beyond a redshift of 10, stars within protogalaxies created the first heavy elements; these systems, together perhaps with an early population of quasars, generated the ultraviolet radiation and mechanical energy that reheated and reionized the cosmos.
openaire +2 more sources
THE CONTRIBUTION OF SUPERNOVAE TO COSMIC REIONIZATION [PDF]
The Astrophysical Journal, 2011 12 pages, 4 figures; ApJ in ...
Johnson, J., Khochfar, S.
openaire +3 more sources
Cosmological reionization [PDF]
AIP Conference Proceedings, 2001 The universe was reionized by redshift z ~ 6 by a small fraction of the baryons in the universe, which released energy following their condensation out of a cold, dark, and neutral IGM into the earliest galaxies. The theory of this reionization is a critical missing link in the theory of galaxy formation.
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A local clue to the reionization of the universe [PDF]
Science, 2014 Identifying the population of galaxies that was responsible for the reionization of the universe is a long-standing quest in astronomy. We present a possible local analog that has an escape fraction of ionizing flux of 21%. Our detection confirms the existence of gaps in the neutral gas enveloping the starburst region.
Borthakur, Sanchayeeta +3 more
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Early reionization in cosmology [PDF]
Infrared Physics & Technology, 1994 The cosmic microwave background (CMB) anisotropies have turned out to represent one of the most stringent 'bottle necks' for scenarios of large scale structure formation. As a possibility to relax this constraint, it has been proposed that early reionization can damp CMB fluctuations on small scales due to photon diffusion in the ionized plasma.
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The infancy of cosmic reionization [PDF]
Monthly Notices of the Royal Astronomical Society, 2008 We consider the early stages of cosmic hydrogen or helium reionization, when ionizing sources were still rare. We show that Poisson fluctuations in the galaxy distribution substantially affected the early bubble size distribution, although galaxy clustering was also an essential factor even at the earliest times.
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Dust distribution during reionization [PDF]
Astronomy & Astrophysics, 2007 The dust produced by the first generation of stars will be a foreground to cosmic microwave background. In order to evaluate the effect of this early dust, we calculate the power spectrum of the dust emission anisotropies and compare it with the sensitivity limit of the Planck satellite.
Elfgren, E. +2 more
openaire +4 more sources