The relation between accretion rate and jet power in early-type galaxies with thermally unstable hot atmospheres

Tomáš, Plšek,; Werner, Norbert; Grossová, Romana; Topinka, M.; Simionescu, A.; Allen, Steven W.

doi:10.1093/mnras/stac2770

Cited by 8 publications

(20 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly, accretion density profiles for hot X-ray emitting gas using Chandra observations of SMBHs for a large sample of 20 nearby galaxies are reported by Plšek et al (2022), all of which show clearly falling radial profiles beyond the Bondi radius, with power-law slopes close to the expectations of the new model presented here. Figure 4 shows the inferred volumetric electron density profiles from Plšek et al (2022) for NGC 1316 and NGC 4649, points with error bars, together with R −3/2 fits to the observed profiles. In all cases for the innermost points, the reported relative radial errors are 100%, for which reason the innermost points have been ignored in the fits.…”

supporting

confidence: 81%

“…In Section 2, we present a new exact analytic spherically symmetric accretion model for γ = 5/3, explore some of its scalings and implications, and present a comparison to the corresponding Bondi model and to a couple of observed accretion density profiles in nearby X-ray emitting elliptical galaxies from the sample of Plšek et al (2022). Our new solution is then used in Section 3 as the basis for a first-order perturbative analysis preserving axial symmetry, but to first order on departures from sphericity with the polar angle and considering the inclusion of angular momentum, also to first order.…”

Section: Introductionmentioning

confidence: 99%

“…Section 6 presents our conclusions. Appendix A shows the fits of our new spherical accretion model to the full sample of observed accretion density profiles from Plšek et al (2022), and finally, Appendix B presents a perturbative analysis for deviations from γ = 5/3 for the spherically symmetric model.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Hydrodynamic Spherical Accretion Exact Solution and Its Quasi-spherical Perturbations

Hernández

Nasser

Aguayo-Ortiz

2023

ApJ

View full text Add to dashboard Cite

We present an exact γ = 5/3 spherical accretion solution that modifies the Bondi boundary condition of ρ → constant as r → ∞ to ρ → 0 as r → ∞. This change allows for simple power-law solutions on the density and infall velocity fields, ranging from a cold empty freefall condition where pressure tends to zero, to a hot hydrostatic equilibrium limit with no infall velocity. As in the case of the Bondi solution, a maximum accretion rate appears. As in the γ = 5/3 case of the Bondi solution, no sonic radius appears, this time however, because the flow is always characterized by a constant Mach number. This number equals 1 for the case of the maximum accretion rate, diverges toward the cold empty state, and becomes subsonic toward the hydrostatic equilibrium limit. It can be shown that in the limit r → 0, the Bondi solution tends to the new solution presented, extending the validity of the Bondi accretion value to cases where the accretion density profile does not remain at a fixed constant value out to infinity. We then explore small deviations from sphericity and the presence of angular momentum through an analytic perturbative analysis. Such perturbed solutions yield a rich phenomenology through density and velocity fields in terms of Legendre polynomials, which we begin to explore for simple angular velocity boundary conditions having zeros on the plane and pole. The new solution presented provides complementary physical insight into accretion problems in general.

show abstract

supporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Hydrodynamic Spherical Accretion Exact Solution and Its Quasi-spherical Perturbations

Hernández

Nasser

Aguayo-Ortiz

2023

ApJ

View full text Add to dashboard Cite

show abstract

“…However, these jets impact a relatively small fraction of the accreting gas. While a large number of simulations have been able to explore self-regulation of AGN in cluster environments (Cattaneo & Teyssier 2007;Sĳacki et al 2007;Dubois et al 2010;Gaspari et al 2012;Li & Bryan 2014;Prasad et al 2015;Yang & Reynolds 2016;Bourne & Sĳacki 2017), these simulations lack the dynamic range to study black hole feeding at scales below 𝑅 B .…”

Section: Mechanical Feedback On the Accretion Flowmentioning

confidence: 99%

“…including all sectors at the innermost "Bondi radius" point. While this work was in preparation, another measurement of 𝑀 B was performed by Plšek et al (2022) which leveraged the data from our new campaign, presented here and publicly available. They found 𝑀 B = 2.4 +1.9 −1.5 × 10 −3 𝑀 yr −1 , again using all sectors.…”

Section: Comparison To Other Measurementsmentioning

confidence: 99%

AGN Feeding and Feedback in M84: From Kiloparsec Scales to the Bondi Radius

Bambic¹,

Russell²,

Reynolds³

et al. 2023

Preprint

View full text Add to dashboard Cite

We present the deepest Chandra observation to date of the galaxy M84 in the Virgo Cluster, with over 840 kiloseconds of data provided by legacy observations and a recent 730 kilosecond campaign. The increased signal-to-noise allows us to study the origins of the accretion flow feeding the supermassive black hole in the center of M84 from the kiloparsec scales of the X-ray halo to the Bondi radius, 𝑅 B . Temperature, metallicity, and deprojected density profiles are obtained in four sectors about M84's AGN, extending into the Bondi radius. Rather than being dictated by the potential of the black hole, the accretion flow is strongly influenced by the AGN's bipolar radio jets. Along the jet axis, the density profile is consistent with 𝑛 𝑒 ∝ 𝑟 −1 ; however, the profiles flatten perpendicular to the jet. Radio jets produce a significant asymmetry in the flow, violating a key assumption of Bondi accretion. Temperature in the inner kiloparsec is approximately constant, with only a slight increase from 0.6 to 0.7 keV approaching 𝑅 B , and there is no evidence for a temperature rise imposed by the black hole. The Bondi accretion rate 𝑀 B exceeds the rate inferred from AGN luminosity and jet power by over four orders of magnitude. In sectors perpendicular to the jet, 𝑀 B measurements agree; however, the accretion rate is > 4𝜎 lower in the North sector along the jet, likely due to cavities in the X-ray gas. Our measurements provide unique insight into the fueling of AGN responsible for radio mode feedback in galaxy clusters.

show abstract

CAvity DEtection Tool (CADET): pipeline for detection of X-ray cavities in hot galactic and cluster atmospheres

Plšek,

Werner,

Topinka

et al. 2023

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

The study of jet-inflated X-ray cavities provides a powerful insight into the energetics of hot galactic atmospheres and radio-mechanical AGN feedback. By estimating the volumes of X-ray cavities, the total energy and thus also the corresponding mechanical jet power required for their inflation can be derived. Properly estimating their total extent is, however, non-trivial, prone to biases, nearly impossible for poor-quality data, and so far has been done manually by scientists. We present a novel machine-learning pipeline called Cavity Detection Tool (CADET), developed as an assistive tool that detects and estimates the sizes of X-ray cavities from raw Chandra images. The pipeline consists of a convolutional neural network trained for producing pixel-wise cavity predictions and a DBSCAN clustering algorithm, which decomposes the predictions into individual cavities. The convolutional network was trained using mock observations of early-type galaxies simulated to resemble real noisy Chandra-like images. The network’s performance has been tested on simulated data obtaining an average cavity volume error of 14 per cent at an 89 per cent true-positive rate. For simulated images without any X-ray cavities inserted, we obtain a 5 per cent false-positive rate. When applied to real Chandra images, the pipeline recovered 93 out of 97 previously known X-ray cavities in nearby early-type galaxies and all 14 cavities in chosen galaxy clusters. Besides that, the CADET pipeline discovered seven new cavity pairs in atmospheres of early-type galaxies (IC 4765, NGC 533, NGC 2300, NGC 3091, NGC 4073, NGC 4125, and NGC 5129) and a number of potential cavity candidates.

show abstract

The relation between accretion rate and jet power in early-type galaxies with thermally unstable hot atmospheres

Cited by 8 publications

References 75 publications

A New Hydrodynamic Spherical Accretion Exact Solution and Its Quasi-spherical Perturbations

A New Hydrodynamic Spherical Accretion Exact Solution and Its Quasi-spherical Perturbations

AGN Feeding and Feedback in M84: From Kiloparsec Scales to the Bondi Radius

CAvity DEtection Tool (CADET): pipeline for detection of X-ray cavities in hot galactic and cluster atmospheres

Contact Info

Product

Resources

About