Observational appearances of isolated stellar-mass black hole accretion – Theory and observations

Beskin, G.; Biryukov, A. V.; Карпов, С.; Plokhotnichenko, V. L.; Debur, V.

doi:10.1016/j.asr.2007.03.104

Cited by 6 publications

(16 citation statements)

References 19 publications

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“…To calculate the accretion rate and luminosity expected for each PBH throughout the cosmic history I follow the methods discussed in [33][34][35][36][37][38] and [8]. I first need to derive the accretion rate Ṁ onto the PBH.…”

Section: Basic Parameters Of the Toy Modelmentioning

confidence: 99%

“…The electromagnetic spectrum and radiative efficiency expected from low-rate accretion onto isolated stellar-mass black holes in the interstellar medium of our Galaxy is discussed in [34] and [35]. These calculations are made for low redshifts, where energy equipartition between the gas kinetic energy, magnetic fields and cosmic rays in the interstellar medium is assumed.…”

Section: Accretion Spectrum and Radiative Efficiencymentioning

confidence: 99%

“…In the following I use the electromagnetic spectra predicted by [35] as a function of normalized mass accretion rate ṁ. These spectra are shown in figure 2 (right) for -9< ṁ<-4, kindly provided in computer readable form by Sergey Karpov (2020, priv.…”

Section: Accretion Spectrum and Radiative Efficiencymentioning

confidence: 99%

“…It is obvious, that for accretion rates log( ṁ)<-5 the normalized radiation efficiency decreases substantially with decreasing ṁ. Indeed, [35] give the radiation efficiency in their figure 5, which can be approximated by η ∝ ṁ0.85 for log( ṁ)<-6, while levelling off roughly at η = 0.1 for log( ṁ)>-5.…”

Section: Accretion Spectrum and Radiative Efficiencymentioning

confidence: 99%

“…To calculate the history of pre-ionization by PBH I integrate the respective spectral distributions in [35] above the frequency log(ν)=15.52 Hz, corresponding to the hydrogen ionization energy of 13.6 eV, and find that for the relevant ṁ values about 50% of the bolometric luminosity is emitted above this frequency. I convert this into ionizing photons, assuming the corresponding bolometric luminosity for a PBH mass of 1.4 M from figure 3 (left).…”

Section: Re-ionizationmentioning

confidence: 99%

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Illuminating the dark ages: Cosmic backgrounds from accretion onto primordial black hole dark matter

Hasinger

2020

Preprint

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The recent interpretation of cold dark matter as the sum of contributions of different mass Primordial Black Hole (PBH) families [1] could explain a number of so far unsolved mysteries, like e.g. the massive seed black holes required to create the supermassive black holes in the earliest QSOs, the ubiquitous massive LIGO/VIRGO massive binary black holes, or even the putative "Planet X" PBH in our Solar System. By far the most abundant family of PBH should be around the Chandrasekhar mass (1.4 M ). This prediction may already have been vindicated by the recent OGLE/GAIA discovery of a sizeable population of putative black holes in the mass range 1-10 M .Here I assume that all dark matter exists in the form of 1.4 M PBH and estimate the contribution of baryon accretion onto this population to various cosmic background radiations, concentrating first on the cross-correlation signal between the Cosmic X-ray and the Cosmic infrared background fluctuations discovered in deep Chandra and Spitzer surveys. I assume Bondi accretion with reasonable parameters like baryon density and the effective relative velocity between baryons and PBH as well as appropriate accretion and radiation efficiencies and integrate these over cosmic time. I indeed predict a contribution of PBH accretion to the X-ray background consistent with the residual X-ray fluctuation signal. This signal peaks at redshifts z≈17-30, consistent with other constraints requiring the signal to come from such high redshifts. The PBH contribution to the 2-5 µm Cosmic Infrared background fluctuations is only about 1%, so that these likely come from star formation processes in regions associated with the PBH.I discuss a number of other phenomena, which could be significantly affected by the PBH accretion. Magnetic fields are an essential ingredient in the Bondi accretion process, and argue that the PBH can play an important role in amplifying magnetic seed fields in the early universe and maintaining them until the galactic dynamo processes set in. Next I study the contribution of the assumed PBH population to the re-ionization history of the universe and find that they do not conflict with the stringent ionization limits set by the most recent Planck measurements. X-ray heating from the PBH population can provide a contribution to the entropy floor observed in groups of galaxies. The tantalizing redshifted 21-cm absorption line feature observed by em EDGES could be connected to the radio emission contributed by PBH to the cosmic background radiation. Finally, the diffuse X-ray emission in the Galactic Center region is not violated by the assumed PBH dark matter, on the contrary, some of the discrete sources resolved in the deepest Chandra observations of the Galactic Ridge could indeed be accreting PBH. Contents 1 Introduction 1 2 Basic parameters of the toy model 3 3 Accretion spectrum and radiative efficiency 6 4 The contribution of PBH to the extragalactic background light 8 5 Discussion 11 5.1 Linear versus post-linear growth 11 5.2 Magnetic fields in the early...

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Section: Basic Parameters Of the Toy Modelmentioning

confidence: 99%

Section: Accretion Spectrum and Radiative Efficiencymentioning

confidence: 99%

Section: Accretion Spectrum and Radiative Efficiencymentioning

confidence: 99%

Section: Accretion Spectrum and Radiative Efficiencymentioning

confidence: 99%

Section: Re-ionizationmentioning

confidence: 99%

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Illuminating the dark ages: Cosmic backgrounds from accretion onto primordial black hole dark matter

Hasinger

2020

Preprint

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Jets and gamma-ray emission from isolated accreting black holes

Barkov¹,

Khangulyan

Попов

2012

Monthly Notices of the Royal Astronomical Society

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The large number of isolated black holes (IBHs) in the Galaxy, estimated to be 10^8, implies a very high density of 10^-4 pc^-3 and an average distance between IBHs of 10 pc. Our study shows that the magnetic flux, accumulated on the horizon of an IBH because of accretion of interstellar matter, allows the Blandford-Znajeck mechanism to be activated. Thus, electron-positron jets can be launched. We have performed 2D numerical modelling which allowed the jet power to be estimated. Their inferred properties make such jets a feasible electron accelerator which, in molecular clouds, allows electron energy to be boosted up to 1 PeV. For the conditions expected in molecular clouds the radiative cooling time should be comparable to the escape time. Thus these sources can contribute both to the population of unidentified point-like sources and to the local cosmic ray (CR) electron spectrum. The impact of the generated electron CRs depends on the diffusion rate inside molecular clouds (MCs). If the diffusion regime in a MC is similar to Galactic diffusion, the produced electrons should rapidly escape the cloud and contribute to the Galactic CR population at very high energies >100 TeV. However, due to the modest jet luminosity (at the level of 10^35 erg s^-1) and low filling factor of MC, these sources cannot make a significant contribution to the spectrum of cosmic ray electrons at lower energies. On the other hand, if the diffusion within MCs operates at a rate close to the Bohm limit, the CR electrons escaping from the source should be confined in the cloud, significantly contributing to the local density of CRs. The IC emission of these locally-generated CRs may explain the variety of gamma ray spectra detected from nearby MCs.Comment: 6 pages, accepted by MNRA

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Peculiar Objects in the Birthplaces of Radio Pulsars—Stellar-Mass Black Hole Candidates

Chmyreva

Beskin

2022

Astrophys. Bull.

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Observational appearances of isolated stellar-mass black hole accretion – Theory and observations

Cited by 6 publications

References 19 publications

Illuminating the dark ages: Cosmic backgrounds from accretion onto primordial black hole dark matter

Illuminating the dark ages: Cosmic backgrounds from accretion onto primordial black hole dark matter

Jets and gamma-ray emission from isolated accreting black holes

Peculiar Objects in the Birthplaces of Radio Pulsars—Stellar-Mass Black Hole Candidates

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