Results 61 to 70 of about 2,334,856 (294)

Heating of the intergalactic medium by the cosmic microwave background during cosmic dawn [PDF]

Physical Review D, 2018
The intergalactic medium is expected to be at its coldest point before the formation of the first stars in the universe. Motivated by recent results from the EDGES experiment, we revisit the standard calculation of the kinetic temperature of the neutral ...
T. Venumadhav, L. Dai, A. Kaurov, M. Zaldarriaga   +3 more
semanticscholar   +1 more source

Lyman alpha Absorption Systems and the Intergalactic Medium [PDF]

Phil.Trans.Roy.Soc.Lond. A358 (2000) 2049, 2000
The last few years have seen a dramatic improvement in our understanding of the origin of Lyman alpha absorption systems. Hydrodynamic numerical simulations of cold dark matter dominated universes have shown that the many properties of the Lyman alpha absorption systems can be explained by a photoionized, space-filling, intergalactic medium.
arxiv   +1 more source

Heating of the Intergalactic Medium by Hydrogen Reionization [PDF]

Astrophysical Journal, 2018
During reionization, the intergalactic medium is heated impulsively by supersonic ionization fronts (I-fronts). The peak gas temperatures behind the I-fronts, , are a key uncertainty in models of the thermal history after reionization.
Anson D’Aloisio, M. McQuinn, Oliver Maupin, F. Davies, H. Trac, S. Fuller, Phoebe R. Upton Sanderbeck   +6 more
semanticscholar   +1 more source

Directly Tracing Cool Filamentary Accretion over >100 kpc into the Interstellar Medium of a Quasar Host at z = 1

The Astrophysical Journal Letters, 2022
We report the discovery of giant (50−100 kpc) [O ii ] emitting nebulae with MUSE in the field of TXS 0206−048, a luminous quasar at z = 1.13. “Down-the-barrel” UV spectra of the quasar show absorption at velocities coincident with those of the extended ...
Sean D. Johnson, Joop Schaye, Gregory L. Walth, Jennifer I-Hsiu Li, Gwen C. Rudie, Hsiao-Wen Chen, Mandy C. Chen, Benoît Epinat, Massimo Gaspari, Sebastiano Cantalupo, Wolfram Kollatschny, Zhuoqi (Will) Liu, Sowgat Muzahid   +12 more
doaj   +1 more source

The Low-redshift Intergalactic Medium [PDF]

Publications of the Astronomical Society of Australia, 1999
AbstractThe low-redshift Lyα forest of absorption lines provides a probe of large-scale baryonic structures in the intergalactic medium, some of which may be remnants of physical conditions set up during the epoch of galaxy formation. We discuss our recent Hubble Space Telescope (HST) observations and interpretation of low-z Lyα clouds toward nearby ...
Steven V. Penton, John T. Stocke, J. Michael Shull   +2 more
openaire   +3 more sources

The fraction of ionizing radiation from massive stars that escapes to the intergalactic medium [PDF]

Monthly notices of the Royal Astronomical Society, 2018
Whether stars could have driven the reionization of the intergalactic medium depends critically on the proportion of ionizing radiation that escapes the galaxies in which it is produced.
N. Tanvir, J. Fynbo, A. D. U. Postigo, J. Japelj, K. Wiersema, K. Wiersema, D. Malesani, D. Perley, A. Levan, J. Selsing, S. B. Cenko, S. B. Cenko, D. A. Kann, B. Milvang-Jensen, E. Berger, Z. Cano, R. Chornock, S. Covino, A. Cucchiara, V. D’Elia, V. D’Elia, A. Gargiulo, P. Goldoni, A. Gomboc, K. Heintz, K. Heintz, J. Hjorth, L. Izzo, P. Jakobsson, L. Kaper, T. Krühler, T. Laskar, M. Myers, S. Piranomonte, G. Pugliese, A. Rossi, R. Sánchez-Ramírez, S. Schulze, M. Sparre, E. Stanway, G. Tagliaferri, C. Thöne, S. Vergani, P. Vreeswijk, R. Wijers, D. Watson, Dong Xu   +46 more
semanticscholar   +1 more source

PECULIARITIES OF MIXING METALS IN INTERGALACTIC AND INTERSTELLAR MEDIA

Odessa Astronomical Publications, 2008
We review the current status of the problem of metal mixing in the intergalactic and interstellar media. We give simple arguments for inefficiency of mixing metals because of a saturation of hydrodynamic (Rayleigh-Taylor and Kelvin-Helmholz ...
S. Yu. Dedikov, Yu. A. Shchekinov, E. O. Vasiliev   +2 more
doaj   +1 more source

Sources for Metals in the Intergalactic Medium [PDF]

The Astrophysical Journal, 2005
We present a discussion of possible sources of C, O, and Si in the IGM using the yields of VMSs and SNe II. The chemical evolution of the IGM is considered based on analytical phenomenological models of hierarchical structure formation. Two regimes are considered: one for gas expulsion by VMSs and SNe II in low-mass halos prior to dissociation of H2 ...
Qian, Y.-Z., Wasserburg, G. J.
openaire   +6 more sources

Measurement of the primordial helium abundance from the intergalactic medium [PDF]

Nature Astronomy, 2018
Almost every helium atom in the Universe was created just a few minutes after the Big Bang through a process commonly referred to as Big Bang nucleosynthesis1,2.
R. Cooke, M. Fumagalli
semanticscholar   +1 more source