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X-ray background and its correlation with the 21 cm signal
Ma, Q.1,2,3,4; Ciardi, B.2; Eide, M. B.2; Helgason, K.2,5
2018-10-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume480Issue:1Pages:26-34
Abstract

We use high-resolution hydrodynamical simulations to study the contribution to the X-ray background from high-z energetic sources, such as X-ray binaries, accreting nuclear black holes, and shock heated interstellar medium. Adopting the model discussed in Eide et al. (2018), we find that these X-ray sources during the Epoch of Reionization (EoR) contribute less than a few per cent of the unresolved X-ray background. The same sources contribute to less than similar to 2 per cent of the measured angular power spectrum of the fluctuations of the X-ray background. The outputs of radiative transfer simulations modeling the EoR are used to evaluate the cross-correlations of X-ray background with the 21 cm signal from neutral hydrogen. Such correlation could be used to confirm the origin of the 21 cm signal, as well as give information on the properties of the X-ray sources during the EoR. We find that the correlations are positive during the early stages of reionization when most of the hydrogen is neutral, while they become negative when the intergalactic medium gets highly ionized, with the transition from positive to negative depending on both the X-ray model and the scale under consideration. With SKA as the reference instrument for the 21 cm experiment, the predicted S/N for such correlations is < 1 if the corresponding X-ray survey is only able to resolve and remove X-ray sources with observed flux > 10(-15) erg cm(-2) s(-1), while the cumulative S/N from l = 1000 to 10(4) at x(HI) = 0.5 is similar to 5 if sources with observed flux > 10(-17) erg cm(-2) s(-1) are detected.

Keywordgalaxies: high-redshift dark ages, reionization, first stars X-rays: diffuse background
DOI10.1093/mnras/sty1806
WOS KeywordRADIATIVE-TRANSFER ; POWER SPECTRUM ; REIONIZATION ; GALAXIES ; UNIVERSE ; FLUCTUATIONS ; SIGNATURES ; STARS ; LINE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000442567900003
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/21776
Collection中国科学院紫金山天文台
Corresponding AuthorMa, Q.
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany
3.Guizhou Normal Univ, Guizhou Prov Key Lab Radio Astron & Data Proc, Guiyang 550001, Guizhou, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
5.Univ Iceland, Ctr Astrophys & Cosmol, Dunhagi 5, IS-107 Reykjavik, Iceland
Recommended Citation
GB/T 7714
Ma, Q.,Ciardi, B.,Eide, M. B.,et al. X-ray background and its correlation with the 21 cm signal[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,480(1):26-34.
APA Ma, Q.,Ciardi, B.,Eide, M. B.,&Helgason, K..(2018).X-ray background and its correlation with the 21 cm signal.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,480(1),26-34.
MLA Ma, Q.,et al."X-ray background and its correlation with the 21 cm signal".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 480.1(2018):26-34.
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