Effect of non-equilibrium ionization on derived physical conditions of the high-z intergalactic medium
TLDR
In this article, the effect of non-equilibrium ionization evolution and UV ionizing background (UVB) generated with different quasar spectral energy distribution (SED) on the derived physical conditions of the intergalactic medium (IGM) at $2\leq z \leq 6$ using their post-processing tool 'Code for Ionization and Temperature Evolution' (CITE).Abstract:
Non-equilibrium ionization effects are important in cosmological hydrodynamical simulations but are computationally expensive. We study the effect of non-equilibrium ionization evolution and UV ionizing background (UVB) generated with different quasar spectral energy distribution (SED) on the derived physical conditions of the intergalactic medium (IGM) at $2\leq z \leq 6$ using our post-processing tool 'Code for Ionization and Temperature Evolution' (CITE). CITE produces results matching well with self-consistent simulations more efficiently. The HeII reionization progresses more rapidly in non-equilibrium model as compared to equilibrium models. The redshift of HeII reionization strongly depends on the quasar SED and occurs earlier for UVB models with flatter quasar SEDs. During this epoch the normalization of temperature-density relation, $T_0(z)$, has a maximum while the slope, $\gamma(z)$, has a minimum, but occurring at different redshifts. The $T_0$ is higher in non-equilibrium models using UVB obtained with flatter quasar SEDs. While our models produce the observed median HeII effective optical depth evolution and its scatter for equilibrium and non-equilibrium considerations, to explain the observed cumulative distributions we may need to consider fluctuating UVB. For a given UVB model, the redshift dependence of the HI photo-ionization rate derived from the observed HI effective optical depth ($\tau_{\rm eff,HI}$) for the equilibrium model is different from that for the non-equilibrium model. This may lead to different requirements on the evolution of ionizing emissivities of sources. We show that, in the absence of strong differential pressure smoothing effects, it is possible to recover the $T_0$ and $\gamma$ realised in non-equilibrium model from the equilibrium models generated by rescaling photo-heating rates while producing the same $\tau_{\rm eff,HI}$.read more
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New synthesis models of consistent extragalactic background light over cosmic time
TL;DR: In this paper, the authors presented new synthesis models of the extragalactic background light (EBL) from far infra-red (FIR) to TeV gamma-rays, with an emphasis on the extreme ultraviolet (UV) background which is responsible for the observed ionization and thermal state of the intergalactic medium across the cosmic time.
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Inferring the dark matter power spectrum from the Lyman-Alpha forest in high-resulotion QSO absorption spectra
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Probing the thermal state of the intergalactic medium at z > 5 with the transmission spikes in high-resolution Ly α forest spectra
Prakash Gaikwad,Michael Rauch,Martin G. Haehnelt,Ewald Puchwein,James S. Bolton,Laura C. Keating,Girish Kulkarni,Vid Iršič,Eduardo Bañados,George D. Becker,Elisa Boera,Fakhri S. Zahedy,Hsiao-Wen Chen,Robert F. Carswell,Jonathan Chardin,Alberto Rorai +15 more
TL;DR: In this article, a profile fitting procedure for the inverted transmitted flux, $1-F$, similar to the widely used Voigt profile fitting of the transmitted flux $F$ at lower redshifts, was used to characterise the transmission spikes that probe predominately underdense regions of the intergalactic medium (IGM).
Journal ArticleDOI
A consistent and robust measurement of the thermal state of the IGM at 2 ≤ z ≤ 4 from a large sample of Ly α forest spectra: evidence for late and rapid He ii reionization
TL;DR: In this paper, the thermal state of the intergalactic medium (IGM) in ten redshift bins in the redshift range was characterised with a sample of 103 high resolution, high S/N Ly$\alpha$ forest spectra using four different flux distribution statistics.
Journal ArticleDOI
The evolution of the low-density H i intergalactic medium from z = 3.6 to 0: data, transmitted flux, and H i column density,,
References
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Journal ArticleDOI
Planck 2013 results. XVI. Cosmological parameters
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TL;DR: In this paper, the authors present the first cosmological results based on Planck measurements of the cosmic microwave background (CMB) temperature and lensing-potential power spectra, which are extremely well described by the standard spatially-flat six-parameter ΛCDM cosmology with a power-law spectrum of adiabatic scalar perturbations.
Journal ArticleDOI
Planck 2013 results. XVI. Cosmological parameters
Peter A. R. Ade,Nabila Aghanim,C. Armitage-Caplan,Monique Arnaud,M. Ashdown,Fernando Atrio-Barandela,J. Aumont,Carlo Baccigalupi,A. J. Banday,R. B. Barreiro,James G. Bartlett,E. Battaner,K. Benabed,Alain Benoit,A. Benoit-Lévy,J.-P. Bernard,Marco Bersanelli,P. Bielewicz,Jérôme Bobin,James J. Bock,Anna Bonaldi,J. R. Bond,Julian Borrill,François R. Bouchet,M. Bridges,M. Bucher,Carlo Burigana,R. C. Butler,Erminia Calabrese,B. Cappellini,Jean-François Cardoso,A. Catalano,Anthony Challinor,A. Chamballu,Ranga-Ram Chary,Xin Chen,H. C. Chiang,Lung-Yih Chiang,P. R. Christensen,Sarah E. Church,David L. Clements,S. Colombi,L. P. L. Colombo,F. Couchot,A. Coulais,B. P. Crill,A. Curto,F. Cuttaia,Luigi Danese,R. D. Davies,R. J. Davis,P. de Bernardis,A. de Rosa,G. de Zotti,Jacques Delabrouille,J.-M. Delouis,F.-X. Désert,Clive Dickinson,Jose M. Diego,Klaus Dolag,H. Dole,S. Donzelli,Olivier Doré,Marian Douspis,Jo Dunkley,X. Dupac,George Efstathiou,F. Elsner,Torsten A. Enßlin,H. K. Eriksen,Fabio Finelli,Olivier Forni,M. Frailis,Aurelien A. Fraisse,E. Franceschi,T. C. Gaier,S. Galeotta,Silvia Galli,K. Ganga,M. Giard,Giovanna Giardino,Y. Giraud-Héraud,E. Gjerløw,J. González-Nuevo,Krzysztof M. Gorski,Serge Gratton,A. Gregorio,Alessandro Gruppuso,Jon E. Gudmundsson,J. Haissinski,Jan Hamann,F. K. Hansen,Duncan Hanson,D. L. Harrison,Sophie Henrot-Versille,C. Hernández-Monteagudo,D. Herranz,S. R. Hildebrandt,E. Hivon,Michael P. Hobson,W. A. Holmes,Allan Hornstrup,Z. Hou,W. Hovest,Kevin M. Huffenberger,Andrew H. Jaffe,T. R. Jaffe,J. Jewell,W. C. Jones,Mika Juvela,E. Keihänen,Reijo Keskitalo,Theodore Kisner,R. Kneissl,J. Knoche,Lloyd Knox,Martin Kunz,Hannu Kurki-Suonio,Guilaine Lagache,Anne Lähteenmäki,J.-M. Lamarre,Anthony Lasenby,Massimiliano Lattanzi,R. J. Laureijs,Charles R. Lawrence,S. Leach,J. P. Leahy,R. Leonardi,J. Leon-Tavares,Julien Lesgourgues,Antony Lewis,Michele Liguori,P. B. Lilje,M. Linden-Vørnle,M. López-Caniego,Philip Lubin,J. F. Macías-Pérez,Bruno Maffei,Davide Maino,N. Mandolesi,Michele Maris,D. J. Marshall,Peter G. Martin,E. Martínez-González,Silvia Masi,Marcella Massardi,Sabino Matarrese,F. Matthai,Pasquale Mazzotta,Peter Meinhold,Alessandro Melchiorri,J.-B. Melin,L. Mendes,Eloisa Menegoni,A. Mennella,M. Migliaccio,M. Millea,Subhabrata Mitra,M.-A. Miville-Deschênes,A. Moneti,L. Montier,Gianluca Morgante,Daniel J. Mortlock,Adam Moss,Dipak Munshi,J. A. Murphy,Pavel Naselsky,Federico Nati,Paolo Natoli,Calvin B. Netterfield,Hans Ulrik Nørgaard-Nielsen,F. Noviello,Dmitry Novikov,I. D. Novikov,I. J. O'Dwyer,S. Osborne,Carol Anne Oxborrow,F. Paci,L. Pagano,F. Pajot,Daniela Paoletti,Bruce Partridge,F. Pasian,G. Patanchon,David Pearson,T. J. Pearson,H. V. Peiris,O. Perdereau,L. Perotto,Francesca Perrotta,Valeria Pettorino,F. Piacentini,M. Piat,E. Pierpaoli,Davide Pietrobon,Stéphane Plaszczynski,Paola Platania,Etienne Pointecouteau,G. Polenta,N. Ponthieu,L. Popa,T. Poutanen,G. W. Pratt,G. Prézeau,Simon Prunet,J.-L. Puget,Jörg P. Rachen,William T. Reach,Rafael Rebolo,M. Reinecke,Mathieu Remazeilles,C. Renault,S. Ricciardi,T. Riller,I. Ristorcelli,Graca Rocha,C. Rosset,G. Roudier,Michael Rowan-Robinson,Jose Alberto Rubino-Martin,Ben Rusholme,M. Sandri,D. Santos,M. Savelainen,Giorgio Savini,Douglas Scott,Michael Seiffert,E. P. S. Shellard,Locke D. Spencer,Jean-Luc Starck,V. Stolyarov,R. Stompor,R. V. Sudiwala,R. A. Sunyaev,F. Sureau,D. Sutton,A.-S. Suur-Uski,J.-F. Sygnet,J. A. Tauber,Daniele Tavagnacco,Luca Terenzi,L. Toffolatti,M. Tomasi,M. Tristram,M. Tucci,J. Tuovinen,M. Turler,G. Umana,Luca Valenziano,Jussi-Pekka Väliviita,B. Van Tent,P. Vielva,Fabrizio Villa,Nicola Vittorio,L. A. Wade,Benjamin D. Wandelt,Ingunn Kathrine Wehus,Martin White,Simon D. M. White,Althea Wilkinson,D. Yvon,Andrea Zacchei,Andrea Zonca +262 more
TL;DR: In this paper, the authors present the first results based on Planck measurements of the CMB temperature and lensing-potential power spectra, which are extremely well described by the standard spatially-flat six-parameter LCDM cosmology.
Journal ArticleDOI
The Cosmological simulation code GADGET-2
TL;DR: GADGET-2 as mentioned in this paper is a massively parallel tree-SPH code, capable of following a collisionless fluid with the N-body method, and an ideal gas by means of smoothed particle hydrodynamics.
Journal ArticleDOI
Radiative Transfer in a Clumpy Universe. II. The Ultraviolet Extragalactic Background
Francesco Haardt,Piero Madau +1 more
TL;DR: In this article, a detailed calculation of the propagation of AGN-like ionizing radiation through the intergalactic space is presented, and it is shown that the universe will be more opaque above $4\,$Ryd than previously estimated.