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Cosmological implications of the composite spectra of galactic X-ray binaries constructed using MAXI data
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 52019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 487, no 2, p. 2785-2796Article in journal (Refereed) Published
Abstract [en]

We have investigated the long-term average spectral properties of galactic X-ray binaries in the energy range of 3-20 keV, using long-term monitoring data from MAXI-Gas Slit Camera (GSC). These long-term average spectra are used to construct separately the composite spectra of galactic high mass X-ray binaries (HMXBs) and low mass X-ray binaries (LMXBs). These composite spectra can be described empirically with piece-wise power law with three components. X-rays from HMXBs are considered as important contributors to heating and ionization of neutral hydrogen in the intergalactic medium during the Epoch of Reionization. Using the above empirical form of the compositeHMXBspectra extrapolated to lower energies as an input, we have studied the impact of these sources on the 21-cm signal using the outputs of N-body simulation and 1D radiative transfer. The heating due to the composite spectrum is less patchy compared to power-law spectrum with a spectral index alpha = 1.5, used in previous studies. The amplitude of the heating peak of large-scale power spectrum, when plotted as a function of the redshift, is less for the composite spectrum.

Place, publisher, year, edition, pages
2019. Vol. 487, no 2, p. 2785-2796
Keywords [en]
radiative transfer, stars: neutron, intergalactic medium, dark ages, reionization, first stars, X-rays: binaries, X-rays: galaxies
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Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-171984DOI: 10.1093/mnras/stz1446ISI: 000474919700092OAI: oai:DiVA.org:su-171984DiVA, id: diva2:1347813
Available from: 2019-09-02 Created: 2019-09-02 Last updated: 2019-09-02Bibliographically approved

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Ghara, Raghunath
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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