2020
DOI: 10.1093/mnras/staa2788
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Observing imprints of black hole event horizon on X-ray spectra

Abstract: A fundamental difference between a neutron star (NS) and a black hole (BH) is the absence of a physical surface in the latter. For this reason, any remaining kinetic energy of the matter accreting onto a BH is advected inside its event horizon. In the case of an NS, on the contrary, accreting material is decelerated on the NS surface, and its kinetic energy is eventually radiated away. Copious soft photons produced by the NS surface will affect the properties of the Comptonised component dominating spectra of … Show more

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Cited by 8 publications
(6 citation statements)
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References 33 publications
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“…Fabian et al 2015). We also find that the values of electron temperature are roughly consistent with well-studied BHBs (Burke et al 2017;Banerjee et al 2020), although we find several AGN with higher temperatures. The range of Eddington ratios is similar between the BHBs and our AGN, although the distribution of BHB Eddington ratios may peak at lower values (Burke et al 2017;Banerjee et al 2020).…”
Section: Comparison With Black Hole Binariessupporting
confidence: 88%
“…Fabian et al 2015). We also find that the values of electron temperature are roughly consistent with well-studied BHBs (Burke et al 2017;Banerjee et al 2020), although we find several AGN with higher temperatures. The range of Eddington ratios is similar between the BHBs and our AGN, although the distribution of BHB Eddington ratios may peak at lower values (Burke et al 2017;Banerjee et al 2020).…”
Section: Comparison With Black Hole Binariessupporting
confidence: 88%
“…Remarkably, the same anti-correlation (ρ = −0.84 ± 0.01) between kT e and τ has been found for the hard-state spectra of BHBs (Banerjee et al 2020). A linear regression analysis in logarithmic space yields a strikingly similar slope (−0.87 ± 0.02).…”
Section: Discussionsupporting
confidence: 76%
“…It is discussed in Banerjee et al (2020) that a kT × y diagram may be used to distinguish whether the compact object in a X‐ray binary is a neutron star or a black hole. Considering the (likely) black hole nature of 1E, we can assert that our results marginally corroborate the authors' claim that black holes occupy a slightly upper region in such diagram (see, e.g., their figure 1).…”
Section: Discussion and Final Remarksmentioning
confidence: 99%