Results 11 to 20 of about 30,791 (258)

The thermal history of the intergalactic medium [PDF]

Monthly Notices of the Royal Astronomical Society, 2000
At redshifts z >~ 2, most of the baryons reside in the smooth intergalactic medium which is responsible for the low column density Lyman-alpha forest. This photoheated gas follows a tight temperature-density relation which introduces a cut-off in the distribution of widths of the Lyman-alpha absorption lines (b-parameters) as a function of column ...
Schaye, Joop, Theuns, Tom, Rauch, Michael, Efstathiou, George, Sargent, Wallace L. W.   +4 more
openaire   +7 more sources

The Intergalactic Medium

, 2000
About half a million years after the Big Bang, the ever-fading cosmic blackbody radiation cooled below 3000 K and shifted first into the infrared and then into the radio, and the smooth baryonic plasma that filled the Universe became neutral. The Universe then entered a ``dark age'' which persisted until the first cosmic structures collapsed into ...
Piero Madau
openaire   +4 more sources

Investigating Ionization in the Intergalactic Medium

The Astrophysical Journal
Abstract The intergalactic medium (IGM) contains >50% of the baryonic mass of the Universe, yet the mechanisms responsible for keeping the IGM ionized have not been fully explained. Hence, we investigate ion abundances from the largest blind QSO absorption catalog for clouds that show C iv, N v, and O vi simultaneously. The wavelength
Brad Koplitz, Anjali Ramesh, Sanchayeeta Borthakur   +2 more
openaire   +3 more sources

Towards a Fregean psycholinguistics

Analytic Philosophy, EarlyView., 2023
Abstract This paper is partly exegetical, partly systematic. I argue that Frege's account of what he called “colouring” contains some important insights on how communication is related to mental states such as mental images or emotions. I also show that the Fregean perspective is supported by current research in psycholinguistics and that a full ...
Thorsten Sander
wiley   +1 more source

A New Constraint on the Simulation of the Intergalactic Medium through the Evolution of the Neutral Hydrogen Fraction in the Epoch of Reionization

The Astrophysical Journal, 2023
The thermal history of the intergalactic medium is full of extremely useful data in the field of astrophysics and cosmology. In other words, by examining this environment in different redshifts, the effects of cosmology and astrophysics can be observed ...
S. Mobina Hosseini, Bahareh Soleimanpour Salmasi, Seyed Sajad Tabasi, Javad T. Firouzjaee   +3 more
doaj   +1 more source

Multiphase Gas Interactions on Subarcsec Scales in the Shocked Intergalactic Medium of Stephan’s Quintet with JWST and ALMA

The Astrophysical Journal, 2023
We combine James Webb Space Telescope (JWST) and Hubble Space Telescope imaging with Atacama Large Millimeter Array CO(2–1) spectroscopy to study the highly turbulent multiphase intergalactic medium (IGM) in Stephan’s Quintet on 25–150 pc scales ...
P. N. Appleton, P. Guillard, Bjorn Emonts, Francois Boulanger, Aditya Togi, William T. Reach, Kathleen Alatalo, M. Cluver, T. Diaz Santos, P.-A. Duc, S. Gallagher, P. Ogle, E. O’Sullivan, K. Voggel, C. K. Xu   +14 more
doaj   +1 more source

Power and the Aerial Sublime in Victor Pelevin

The Russian Review, Volume 82, Issue 4, Page 582-598, October 2023., 2023
Abstract This essay distinguishes flight as a salient trope throughout multiple Pelevin texts: Omon Ra (1992), Chapaev and the Void (1996), Generation P (1999), Empire V (2006), and Love for Three Zuckerbrins (2014). It examines flight through the aesthetics of the sublime—classical, (post)‐Soviet, and postmodern.
Sofya Khagi
wiley   +1 more source

Revisiting the emission line source detection problem in integral field spectroscopic data

Astronomische Nachrichten, Volume 344, Issue 5, June 2023., 2023
Abstract We present a 3‐dimensional matched filtering approach for the blind search of faint emission‐line sources in integral‐field spectroscopic datasets. The filter is designed to account for the spectrally rapidly varying background noise due to the telluric air glow spectrum.
Edmund Christian Herenz
wiley   +1 more source

Effect of the metallicity of the intergalactic medium in the Lyman‐α forest correlation function

Astronomische Nachrichten, Volume 344, Issue 1-2, January-February 2023., 2023
Abstract The Lyman‐α (Lyα) forest allows to constraint cosmological parameters at redshifts above 1.8$$ 1.8 $$ using the technique of standard rulers determined by baryon acoustic oscillations. This makes it an important tracer for the study of the universe at high redshift.
Andrea Muñoz‐Gutiérrez, Axel de la Macorra   +1 more
wiley   +1 more source

Numerical simulations of the intergalactic medium

, 2002
The intergalactic medium at redshifts 2--6 can be studied observationally through the absorption features it produces in the spectra of background quasars. Most of the UV-absorption lines arise in mildly overdense regions, which can be simulated reliably with current hydrodynamical simulations. Comparison of observed and simulated spectra allows one to
Tom Theuns
openaire   +4 more sources