Results 91 to 100 of about 32,240 (255)

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 ...
openaire   +2 more sources

Metals in the intergalactic medium [PDF]

Proceedings of the International Astronomical Union, 2005
The absorption lines seen in the spectra of quasars trace gas over a very large range of overdensities, from galaxies to voids and probably account for most of the baryons at high redshift. Once thought to be a chemically pristine remnant of the Big Bang, the Lyman alpha forest has now been shown to contain significant quantities of metals.
openaire   +1 more source

Compton Scattering of Electrons in the Intergalactic Medium

The Astrophysical Journal
This paper investigates the distribution and implications of cosmic-ray electrons within the intergalactic medium (IGM). Utilizing a synthesis model of the extragalactic background, we evolve the spectrum of Compton-included cosmic rays.
Yuanyuan Yang, Heyang Long, Christopher M. Hirata   +2 more
doaj   +1 more source

Filaments and sheets of the warm-hot intergalactic medium

, 2012
Filaments, forming in the context of cosmological structure formation, are not only supposed to host the majority of the baryons at low redshifts in the form of the WHIM, but also to supply forming galaxies at higher redshifts with a substantial amount ...
Klar, J. S., Mücket, J. P.
core   +1 more source

MeV Cosmic-Ray Electrons Modify the TeV Pair-beam Plasma Instability

The Astrophysical Journal
Relativistic pair beams created in the intergalactic medium (IGM) by TeV gamma rays from blazars are expected to produce a detectable GeV-scale electromagnetic cascade, but the cascade component is absent in the spectra of many hard-spectrum TeV-emitting
Mahmoud Alawashra, Yuanyuan Yang, Christopher M. Hirata, Heyang Long, Martin Pohl   +4 more
doaj   +1 more source

Anisotropic AGN Outflows and Enrichment of the Intergalactic Medium

, 2009
We investigate the cosmological-scale influence of outflows driven by AGNs on metal enrichment of the intergalactic medium. AGNs are located in dense cosmological structures which tend to be anisotropic.
Barai, Barai, Barger, Begelman, Bicknell, Blundell, Chartas, Chartas, Choi, Ciotti, Ciotti, Crenshaw, Croston, Das, Dasgupta, Fragile, Furlanetto, Ganguly, Gebhardt, Granato, Grenon, Hickox, Hinshaw, Ho, Ho, Hopkins, Hugo Martel, Joël Germain, Juneau, King, Kormendy, Kronberg, Krongold, Laor, Levine, Mac Low, Magorrian, Marconi, Martel, Martel, Martel, Miller, Murray, Nesvadba, O'Brien, Paramita Barai, Peterson, Pieri, Rafter, Recchi, Rees, Reichard, Richards, Scannapieco, Scannapieco, Schlesinger, Shang, Shankar, Shen, Silk, Springel, Thacker, van Breugel, Wyithe, Yu   +64 more
core   +1 more source

Simulations of the Intergalactic Medium [PDF]

Symposium - International Astronomical Union, 2005
I present an epochal review of baryons in the intergalactic medium (IGM), from the reionization epoch until today. Recent observations indicate a protracted period of reionization, suggesting multiple populations of reionizers; detection of these z ≳ 6 sources is a key goal that is now coming within reach.
openaire   +2 more sources

Bird's-eye View of Molecular Gas across Stephan's Quintet Galaxy Group and Intragroup Medium

The Astrophysical Journal
We present the large-scale distribution and kinematics of cold molecular gas across the compact galaxy group Stephan’s Quintet, based on CO(2–1) observations performed with the Atacama Compact Array (ACA) and CO(1–0) data from the Combined Array for ...
B. H. C. Emonts, P. N. Appleton, U. Lisenfeld, P. Guillard, C. K. Xu, W. T. Reach, L. Barcos-Muñoz, A. Labiano, P. M. Ogle, E. O’Sullivan, A. Togi, S. C. Gallagher, P. Aromal, P.-A. Duc, K. Alatalo, F. Boulanger, T. Díaz-Santos, G. Helou   +17 more
doaj   +1 more source

Detecting metal enrichment of the intergalactic medium with the two-point correlation function of the flux

Astronomy & Astrophysics
Context. The distribution and the abundance of metals in the intergalactic medium (IGM) have strong implications for galaxy formation and evolution models. The ionic transitions of heavy elements in quasar spectra can be used to probe both the mechanisms
Di Stefano S., D’Odorico V., Cupani G., Milaković D., Trost A., Cristiani S., Viel M., Carswell R. F.   +7 more
doaj   +1 more source

HI and Hot Gas in the Outskirts of the M81 Group

, 2003
Results are presented from a wide area, high resolution HI synthesis survey of the outer regions of the nearby M81 group, where internal (galactic) and external (group-related) evolution processes can be studied simultaneously in great detail. The survey
Bureau, M., Carignan, C., van Gorkom, J., Walter, F.   +3 more
core   +1 more source