Breathing oscillations in a global simulation of a thin accretion disc

Mishra, Bhupendra; Kluźniak, W.; Fragile, P. Chris

doi:10.1093/mnras/sty3124

Cited by 9 publications

(12 citation statements)

References 57 publications

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“…The vertical epicyclic frequency ν ⊥ is shown by the dashed cyan curve. A detailed study of these breathing oscillations for the S01E case was reported in Mishra et al (2019), who showed that the vertical motions in the disk at these frequencies match the predicted eigenfunctions. Thus, the identification of the breathing mode is unambiguous.…”

Section: Breathing Oscillationsmentioning

confidence: 68%

“…The strip of power in the upper right corner of the left panel of Fig. 4 is tied to the breathing oscillation (Mishra et al 2019), discussed in Section 2.4.…”

Section: Simulation S01e (Gas-pressure-dominatedmentioning

confidence: 94%

“…We clearly note vertical motion across the midplane around r = 10.8 r g at both the radial and vertical epicyclic frequencies. Remember that, in addition to seeing the vertical and radial oscillations occurring with a 3:2 frequency ratio, we also capture breathing oscillations occurring at all the radii at approximately 5:3 frequency ratio with the vertical epicyclic frequency (Mishra et al 2019). The frequencies we chose for generating the eigenfunctions in Fig.…”

Section: Resonant Oscillations At 3:2 Frequency Ratio For Non-rotatin...mentioning

confidence: 99%

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Relativistic, Viscous, Radiation Hydrodynamic Simulations of Geometrically Thin Disks. II. Disk Variability

Mishra,

Kluźniak,

Fragile

2019

Preprint

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We perform detailed variability analysis of two-dimensional viscous, radiation hydrodynamic numerical simulations of Shakura-Sunyaev thin disks around a stellar mass black hole. Our accretion disk models are initialized on both the gas-, as well as radiation-, pressure-dominated branches of the thermal equilibrium curve, with mass accretion rates spanning the range from M = 0.01L Edd /c 2 to 10L Edd /c 2 . An analysis of high-frequency temporal variations of the numerically simulated disk reveals multiple robust, coherent oscillations. Considering the local mass flux variability, we find an oscillation occurring at the maximum value of the radial epicyclic frequency, 3.5 × 10 −3 t −1 g , a possible signature of a trapped fundamental g-mode. Although present in each of our simulated models, the trapped g-mode feature is most prominent in the gas-pressure-dominated case. Additionally, the total pressure fluctuations in the disk suggest strong evidence for standing-wave p-modes with frequencies ≤ 3.5 × 10 −3 t −1 g , some trapped in the inner disk close to the ISCO, others present in the middle/outer parts of the disk. Knowing that the trapped g-mode frequency and maximum radial epicyclic frequency differ by only 0.01% in the case of a non-rotating black hole, we simulated an additional initially gas-pressure-dominated disk with a dimensionless black hole spin parameter a * = 0.5. The oscillation frequency in the spinning black hole case confirms that this oscillation is indeed a trapped g-mode. All the numerical models we report here also show a set of high frequency oscillations at the vertical epicyclic and breathing mode frequencies. The vertical oscillations show a 3:2 frequency ratio with oscillations occurring approximately at the radial epicyclic frequency, which could be of astrophysical importance in observed twin peak, high-frequency quasi-periodic oscillations. The comparison of inferred power among all the individual oscillations in our models suggests that the strongest oscillations occur at the breathing oscillation frequency.

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Section: Breathing Oscillationsmentioning

confidence: 68%

“…The strip of power in the upper right corner of the left panel of Fig. 4 is tied to the breathing oscillation (Mishra et al 2019), discussed in Section 2.4.…”

Section: Simulation S01e (Gas-pressure-dominatedmentioning

confidence: 94%

Section: Resonant Oscillations At 3:2 Frequency Ratio For Non-rotatin...mentioning

confidence: 99%

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Relativistic, Viscous, Radiation Hydrodynamic Simulations of Geometrically Thin Disks. II. Disk Variability

Mishra,

Kluźniak,

Fragile

2019

Preprint

Self Cite

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“…Since oscillation frequencies of accretion discs are often very close to the orbital frequencies [ 60 , 183 ], they are likely to be excited by the passages of a compact object in an IMRI or an EMRI with a corresponding electromagnetic counterpart. The increased sensitivity of the AMIGO design would allow EMRIs and IMRIs to be detected early enough to launch parallel X-ray observation campaigns [ 179 , 180 ], which would search for associated phenomena such as the elusive quasi-periodic oscillations in the X-ray flux of the host AGN [ 182 , 237 ].…”

Section: Emris: Ideal Probes Of Black-hole Physicsmentioning

confidence: 99%

Probing the nature of black holes: Deep in the mHz gravitational-wave sky

et al. 2021

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Black holes are unique among astrophysical sources: they are the simplest macroscopic objects in the Universe, and they are extraordinary in terms of their ability to convert energy into electromagnetic and gravitational radiation. Our capacity to probe their nature is limited by the sensitivity of our detectors. The LIGO/Virgo interferometers are the gravitational-wave equivalent of Galileo’s telescope. The first few detections represent the beginning of a long journey of exploration. At the current pace of technological progress, it is reasonable to expect that the gravitational-wave detectors available in the 2035-2050s will be formidable tools to explore these fascinating objects in the cosmos, and space-based detectors with peak sensitivities in the mHz band represent one class of such tools. These detectors have a staggering discovery potential, and they will address fundamental open questions in physics and astronomy. Are astrophysical black holes adequately described by general relativity? Do we have empirical evidence for event horizons? Can black holes provide a glimpse into quantum gravity, or reveal a classical breakdown of Einstein’s gravity? How and when did black holes form, and how do they grow? Are there new long-range interactions or fields in our Universe, potentially related to dark matter and dark energy or a more fundamental description of gravitation? Precision tests of black hole spacetimes with mHz-band gravitational-wave detectors will probe general relativity and fundamental physics in previously inaccessible regimes, and allow us to address some of these fundamental issues in our current understanding of nature.

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“…The compilation of the RMS spectrum for 849 quasars observed by SDSS-IV is astonishingly close to a ν 1/3 power-law, supporting again the prescription of Shakura & Sunyaev (Horne et al in prep). The mismatch in the zero point, which is a function of SMBH mass and accretion rate, is a current matter of debate and could point to the failings of the simplicity of classical accretion disk models, as suggested by numerical simulations (Mishra et al 2016(Mishra et al , 2019Sadowski 2016;Jiang et al 2013Jiang et al , 2016; Gronkiewicz & Różańska 2020 -see further discussion in Section 4).…”

Section: Continuum Emission Variability Below 1μm: the Primary Sourcementioning

confidence: 99%

A status report on AGN variability

Lira

2019

Proc. IAU

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Active Galactic Nuclei (AGN) are ubiquitous variable sources. This trademark property allows the study of many aspects of AGN physics which are not possible by other means. In this review I summarize what has been learnt by the close monitoring of AGN flux variations with special emphasis in studies conducted in optical and near-infrared domain. I also highlight what knowledge is still missing from our picture of AGN phenomena, as well as possible developments expected in this new era of time-domain astronomy.

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Breathing oscillations in a global simulation of a thin accretion disc

Cited by 9 publications

References 57 publications

Relativistic, Viscous, Radiation Hydrodynamic Simulations of Geometrically Thin Disks. II. Disk Variability

Relativistic, Viscous, Radiation Hydrodynamic Simulations of Geometrically Thin Disks. II. Disk Variability

Probing the nature of black holes: Deep in the mHz gravitational-wave sky

A status report on AGN variability

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