X-ray Background at High Redshifts from Pop III Remnants: Results from
Pop III star formation rates in the Renaissance Simulations
H. Xu, K. Ahn, M. Norman, J. Wise, и B. O'Shea. (2016)cite arxiv:1607.02664Comment: 5 pages, 5 figures, submitted to Astrophysical Journal Letters.
Аннотация
Due to their long mean free paths, X-rays are expected to have many
significant impacts globally on the properties of the intergalactic medium
(IGM) by their heating and ionizing processes on large scales. At high
redshifts, X-rays from Population (Pop) III binaries might have important
effects on cosmic reionization and the Lyman alpha forest. As a continuation of
our previous work on Pop III binary X-rays (Xu et al. 2014), we use the Pop III
distribution and evolution from the Renaissance Simulations, a suite of
self-consistent cosmological radiation hydrodynamics simulations of the
formation of the first galaxies, to calculate the X-ray luminosity density and
background over the redshift range 20 > z > 7.6. As we find that Pop III star
formation continues at a low, nearly constant rate to the end of reionization,
X-rays are being continuously produced at significant rates compared to other
possible X-ray sources, such as AGNs and normal X-ray binaries during the same
period of time. We estimate that Pop III binaries produce approximately 6 eV of
energy in the X-rays per hydrogen atom. We calculate the X-ray background for
different monochromatic photon energies. KeV X-rays redshift and accumulate to
produce a strong X-ray background spectrum extending to roughly 500 eV. The
X-ray background is strong enough to heat the IGM to ~ 1000 K and to ionize a
few percent of the neutral hydrogen. These effects are important for an
understanding of the neutral hydrogen hyperfine transition 21-cm line
signatures, the Ly alpha forest, and optical depth of the CMB to Thomson
scattering.
Описание
[1607.02664] X-ray Background at High Redshifts from Pop III Remnants: Results from Pop III star formation rates in the Renaissance Simulations
%0 Generic
%1 xu2016background
%A Xu, Hao
%A Ahn, Kyungjin
%A Norman, Michael L
%A Wise, John H
%A O'Shea, Brian W
%D 2016
%K emission popIII stars xray
%T X-ray Background at High Redshifts from Pop III Remnants: Results from
Pop III star formation rates in the Renaissance Simulations
%U http://arxiv.org/abs/1607.02664
%X Due to their long mean free paths, X-rays are expected to have many
significant impacts globally on the properties of the intergalactic medium
(IGM) by their heating and ionizing processes on large scales. At high
redshifts, X-rays from Population (Pop) III binaries might have important
effects on cosmic reionization and the Lyman alpha forest. As a continuation of
our previous work on Pop III binary X-rays (Xu et al. 2014), we use the Pop III
distribution and evolution from the Renaissance Simulations, a suite of
self-consistent cosmological radiation hydrodynamics simulations of the
formation of the first galaxies, to calculate the X-ray luminosity density and
background over the redshift range 20 > z > 7.6. As we find that Pop III star
formation continues at a low, nearly constant rate to the end of reionization,
X-rays are being continuously produced at significant rates compared to other
possible X-ray sources, such as AGNs and normal X-ray binaries during the same
period of time. We estimate that Pop III binaries produce approximately 6 eV of
energy in the X-rays per hydrogen atom. We calculate the X-ray background for
different monochromatic photon energies. KeV X-rays redshift and accumulate to
produce a strong X-ray background spectrum extending to roughly 500 eV. The
X-ray background is strong enough to heat the IGM to ~ 1000 K and to ionize a
few percent of the neutral hydrogen. These effects are important for an
understanding of the neutral hydrogen hyperfine transition 21-cm line
signatures, the Ly alpha forest, and optical depth of the CMB to Thomson
scattering.
@misc{xu2016background,
abstract = {Due to their long mean free paths, X-rays are expected to have many
significant impacts globally on the properties of the intergalactic medium
(IGM) by their heating and ionizing processes on large scales. At high
redshifts, X-rays from Population (Pop) III binaries might have important
effects on cosmic reionization and the Lyman alpha forest. As a continuation of
our previous work on Pop III binary X-rays (Xu et al. 2014), we use the Pop III
distribution and evolution from the Renaissance Simulations, a suite of
self-consistent cosmological radiation hydrodynamics simulations of the
formation of the first galaxies, to calculate the X-ray luminosity density and
background over the redshift range 20 > z > 7.6. As we find that Pop III star
formation continues at a low, nearly constant rate to the end of reionization,
X-rays are being continuously produced at significant rates compared to other
possible X-ray sources, such as AGNs and normal X-ray binaries during the same
period of time. We estimate that Pop III binaries produce approximately 6 eV of
energy in the X-rays per hydrogen atom. We calculate the X-ray background for
different monochromatic photon energies. KeV X-rays redshift and accumulate to
produce a strong X-ray background spectrum extending to roughly 500 eV. The
X-ray background is strong enough to heat the IGM to ~ 1000 K and to ionize a
few percent of the neutral hydrogen. These effects are important for an
understanding of the neutral hydrogen hyperfine transition 21-cm line
signatures, the Ly alpha forest, and optical depth of the CMB to Thomson
scattering.},
added-at = {2016-07-12T10:12:48.000+0200},
author = {Xu, Hao and Ahn, Kyungjin and Norman, Michael L and Wise, John H and O'Shea, Brian W},
biburl = {https://www.bibsonomy.org/bibtex/28ea5b24b1fa519d802ed4cc12e4d9365/miki},
description = {[1607.02664] X-ray Background at High Redshifts from Pop III Remnants: Results from Pop III star formation rates in the Renaissance Simulations},
interhash = {c76f52ab4f13bb934bb1ea67be55bbb6},
intrahash = {8ea5b24b1fa519d802ed4cc12e4d9365},
keywords = {emission popIII stars xray},
note = {cite arxiv:1607.02664Comment: 5 pages, 5 figures, submitted to Astrophysical Journal Letters},
timestamp = {2016-07-12T10:12:48.000+0200},
title = {X-ray Background at High Redshifts from Pop III Remnants: Results from
Pop III star formation rates in the Renaissance Simulations},
url = {http://arxiv.org/abs/1607.02664},
year = 2016
}