Relativistic Magnetized Astrophysical Plasma Outflows in Black-Hole Microquasars

Papavasileiou, Theodora; Kosmas, Odysseas; Sinatkas, Ioannis

doi:10.3390/sym14030485

Cited by 7 publications

(2 citation statements)

References 41 publications

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“…); see Refs. [17][18][19] and references therein. The corresponding broadband emission covers the spectrum from radio to very high energy (VHE) gamma rays.…”

Section: Introductionmentioning

confidence: 99%

Studying the Spectral Energy Distributions Emanating from Regular Galactic XRBs

2023

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X-ray binary systems (XRBs) exhibit similar dynamics and multimessenger emission mechanisms to active galactic nuclei (AGNs) with the benefit of shorter time scaling. Those systems produce rich spectral energy distributions (SEDs) ranging from the radio band to the very high energy gamma rays. The emission origin varies between the system’s accretion disk (X-rays) to the corona and, most notably, to the two twin plasma ejections (jets) that often meet the interstellar medium forming highly observable radio lobes. Modeling of the jets offers an excellent opportunity to understand the intrinsic mechanisms and the jet particles, such as electrons, positrons, and protons. In this work, we employ a lepto-hadronic jet model that assumes particle acceleration through shock waves over separate zonal regions of the jet. The hadronic models consider proton–proton collisions that end up in gamma-ray photons through neutral pion decays. The main leptonic mechanisms involve synchrotron radiation (from both electrons and protons) and inverse Compton scattering of ambient photons (coming from the disk, the corona, and the companion star) on jet electrons. The emissions from the disk, the corona, and the donor star are also included in the SED calculations, along with the photon absorption effects due to their interaction with higher-energy jet photons. We apply the model on a 10M⊙ black hole accreting at the Eddington rate out of a 20M⊙ companion star. One of our goals is to investigate and determine an optimal frame concerning the values for the free parameters that enter our calculations to produce higher integral fluxes.

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“…); see Refs. [17][18][19] and references therein. The corresponding broadband emission covers the spectrum from radio to very high energy (VHE) gamma rays.…”

Section: Introductionmentioning

confidence: 99%

Studying the Spectral Energy Distributions Emanating from Regular Galactic XRBs

2023

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“…Moreover, another mechanism leading to secondary particle creation and photon emission is relativistic proton interactions with photons created inside or outside the jet region. This mechanism was the center of a previous work 9 , but it is not included in this paper.…”

Section: Introductionmentioning

confidence: 99%

Modeling Simulated Emissions from Galactic Binary Stars

Papavasileiou¹,

Kosmas²,

Sinatkas³

2022

Preprint

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Relativistic plasma flows from the jets of black hole binary systems consist the environment of multiple particle production and radiation emission including neutrinos and gamma-rays. We implement a hadronic model based on p − p interactions with the purpose of predicting the produced secondary particle distributions inside the jet. Our ultimate goal is the neutrino and gamma-ray intensities calculation while taking into account the most important gamma-ray absorption processes in order to present more realistic results.

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Prediction of gamma-ray emission from Cygnus X-1, SS 433, and GRS 1915+105 after absorption

Papavasileiou¹,

Kosmas²,

Sinatkas³

2023

A&A

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Context. Stellar black hole X-ray binary stars (BHXRBs) are among the most luminous and powerful systems located in our Milky Way and in other galaxies of the Universe. Their jets are prominent sources of particles (e.g., neutrinos) and radiation emissions in energy ranges detectable by terrestrial and space telescopes, even from galaxies deep in the space. A significant factor, however, would be the photon absorption effect that occur due to scattering on the lower end of the energy radiation of the system’s surroundings. Aims. We aim to study in detail and extract predictions for the emitted gamma-ray intensities and integral fluxes of the jets emanating from BHXRB systems Cygnus X-1, GRS 1915+105, and SS 433. Toward this end, we also investigate the severe effects of gamma-ray absorption that eradicate part of the produced intensity spectra. Furthermore, we explore the jet regions that are most likely to emit unabsorbed gamma-rays capable of reaching detectors on Earth. Our goal is to calculate the integral fluxes before and after absorption for the abovementioned systems and compare the results with the very-high-energy gamma-ray observations of sensitive telescopes such as the MAGIC, H.E.S.S., Fermi-LAT, and so on. Methods. The implemented gamma-ray emission mechanisms initiate from the p − p scattering process inside the hadron-dominated jets following the well-known shock-wave particle acceleration. In addition, we estimate the optical depths of three absorption processes between gamma-ray photons and (i) accretion disk X-ray emission, (ii) black hole corona photons, and (iii) donor star thermal emission. We also examine the dependence of the absorption optical depths on various parameters, such as the disk’s temperature, coronal radius and, donor star luminosity. Results. We find that disk absorption is dominant for distances of z < 1010 cm from the black hole, while the donor star absorption dominates for 1010 < z < 1012 cm. Beyond that jet point, the absorption effects become significantly weaker. Cygnus X-1 presents the highest gamma-ray integral flux across the jet length, while GRS 1915+105 emits the least due to its weakly collimated jets. The jets of SS 433 emit gamma-rays only for z > 1010 cm due to severe disk absorption fueled by the system’s super-Eddington accretion limit.

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Relativistic Magnetized Astrophysical Plasma Outflows in Black-Hole Microquasars

Cited by 7 publications

References 41 publications

Studying the Spectral Energy Distributions Emanating from Regular Galactic XRBs

Studying the Spectral Energy Distributions Emanating from Regular Galactic XRBs

Modeling Simulated Emissions from Galactic Binary Stars

Prediction of gamma-ray emission from Cygnus X-1, SS 433, and GRS 1915+105 after absorption

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