Outbursts from the supermassive black hole in M87 and the impact on the hot gas

2005 ◽  
Vol 36 (4) ◽  
pp. 597-600 ◽  
Author(s):  
C. Jones ◽  
W. Forman ◽  
R. Kraft ◽  
M. Markevitch ◽  
P. Nulsen ◽  
...  
2014 ◽  
Vol 445 (1) ◽  
pp. 686-693 ◽  
Author(s):  
Jarrett L. Johnson ◽  
Daniel J. Whalen ◽  
Bhaskar Agarwal ◽  
Jan-Pieter Paardekooper ◽  
Sadegh Khochfar

2019 ◽  
Vol 492 (4) ◽  
pp. 6086-6104 ◽  
Author(s):  
Aaron Ewall-Wice ◽  
Tzu-Ching Chang ◽  
T Joseph W Lazio

ABSTRACT We use a semi-analytic model to explore the potential impact of a brief and violent period of radio-loud accretion on to black holes (The Radio Scream) during the Cosmic Dawn on the H i hyperfine 21 cm signal. We find that radio emission from supermassive black hole seeds can impact the global 21 cm signal at the level of tens to hundreds of per cent provided that they were as radio loud as $z$ ≈ 1 black holes and obscured by gas with column depths of NH ≳ 1023 cm−2. We determine plausible sets of parameters that reproduce some of the striking features of the EDGES absorption feature including its depth, timing, and side steepness while producing radio/X-ray backgrounds and source counts that are consistent with published limits. Scenarios yielding a dramatic 21 cm signature also predict large populations of ∼$\mu$Jy point sources that will be detectable in future deep surveys from the Square Kilometer Array (SKA). Thus, 21 cm measurements, complemented by deep point-source surveys, have the potential to constrain optimistic scenarios where supermassive black hole progenitors were radio loud.


2019 ◽  
Vol 15 (S356) ◽  
pp. 292-292
Author(s):  
Colin DeGraf

AbstractAlthough it is well understood that supermassive black holes are found in essentially all galaxies, the mechanisms by which they initially form remain highly uncertain, despite the importance that the formation pathway can have on AGN and quasar behaviour at all redshifts. Using a post-processing analysis method combining cosmological simulations and analytic modeling, I will discuss how varying the conditions for formation of supermassive black hole seeds leads to changes in AGN populations. Looking at formation via direct collapse or from PopIII remnants, I will discuss the impact on black hole mass and luminosity functions, scaling relations, and black hole mergers, which each have effects at both high- and low-redshifts. In addition to demonstrating the importance of initial seed formation on our understanding of long-term black hole evolution, I will also show that the signatures of seed formation suggest multiple means by which upcoming electromagnetic and GW surveys (at both high- and low-z) can provide the data required to constrain initial supermassive black hole formation.


2020 ◽  
Vol 496 (3) ◽  
pp. 3060-3075 ◽  
Author(s):  
Davide Gerosa ◽  
Giovanni Rosotti ◽  
Riccardo Barbieri

ABSTRACT Disc-driven migration is a key evolutionary stage of supermassive black hole binaries hosted in gas-rich galaxies. Besides promoting the inspiral, viscous interactions tend to align the spins of the black holes with the orbital angular momentum of the disc. We present a critical and systematic investigation of this problem, also known as the Bardeen–Petterson effect. We design a new iterative scheme to solve the non-linear dynamics of warped accretion discs under the influence of both relativistic frame dragging and binary companion. We characterize the impact of the disc ‘critical obliquity’, which marks regions of the parameter space where stationary solutions do not exist. We find that black hole spins reach either complete alignment or a critical configuration. Reaching the critical obliquity might imply that the disc breaks as observed in hydrodynamical simulations. Our findings are important to predict the spin configurations with which supermassive black hole binaries enter their gravitational-wave driven regime and become detectable by LISA.


2019 ◽  
Vol 15 (S359) ◽  
pp. 99-107
Author(s):  
C. Jones ◽  
W. Forman

AbstractSupermassive black holes (SMBHs) play[-105pt]Kindly check and confirm the Article Title. fundamental roles in the evolution of galaxies, groups, and clusters. The fossil record of supermassive black hole outbursts is seen through the cavities and shocks that are imprinted on these gas-rich systems. For M87, the central galaxy in the Virgo cluster, deep Chandra observations illustrate the physics of AGN feedback in hot, gas-rich atmospheres and allow measurements of the age, duration, and power of the outburst from the supermassive black hole in M87 that produced the observed cavities and shocks in the hot X-ray atmosphere.


2012 ◽  
Vol 545 ◽  
pp. A46 ◽  
Author(s):  
S. Hocuk ◽  
D. R. G. Schleicher ◽  
M. Spaans ◽  
S. Cazaux

2019 ◽  
Vol 871 (2) ◽  
pp. 159 ◽  
Author(s):  
Karina T. Voggel ◽  
Anil C. Seth ◽  
Holger Baumgardt ◽  
Steffen Mieske ◽  
Joel Pfeffer ◽  
...  

2021 ◽  
pp. 35-52
Author(s):  
Jessie Beier

AbstractIn April 2019, the Event Horizon Telescope (EHT) project released an unprecedented image of a supermassive black hole at the centre of galaxy Messier 87. The image, which shows a dark disc outlined by swirling hot gas circling the black hole’s event horizon, exhibits a 55 million-year-old cosmic event in the Virgo galaxy cluster—a void of stellar mass measuring some 6.5 billion times that of our sun. Situated within today’s (Good) Anthropocene scenario, characterized as it is by both the rise of an inhospitable planet but also a range of good vibes and affirmative mantras, this tracing explores this newly “discovered” black hole in terms of the unthinkable questions and speculative trajectories it raises for education and its futures. Through a series of forays into astrophysics, historical examples of cosmic imaging, and further exploration of the image created by EHT, this tracing outlines the black hole and its apparent horizons in order to propose a strange vantage point from which pedagogical problem-posing might be interrupted, mutated, and relaunched. By turning to that which lies outside of the traditional science classroom—beyond the school, beyond curriculum, indeed, beyond the planet itself—this tracing seeks to probe this black hole event in terms of its weird and weirding pedagogical trajectories so as to speculate on unthought possibilities for resituating (science) education in the age of the Anthropocene.


2016 ◽  
Vol 12 (S329) ◽  
pp. 443-443
Author(s):  
Christopher M. P. Russell ◽  
Q. Daniel Wang ◽  
Jorge Cuadra

AbstractWe compute the thermal X-ray emission from hydrodynamic simulations of the 30 Wolf-Rayet (WR) stars orbiting within a parsec of Sgr A*, with the aim of interpreting the Chandra X-ray observations of this region. The model well reproduces the spectral shape of the observations, indicating that the shocked WR winds are the dominant source of this thermal emission. The model X-ray flux is tied to the strength of the Sgr A* outflow, which clears out hot gas from the vicinity of Sgr A*. A moderate outflow best fits the present-day observations, even though this supermassive black hole (SMBH) outflow ended ~100 yr ago.


2009 ◽  
Vol 5 (H15) ◽  
pp. 277-277
Author(s):  
Silvia Pellegrini

AbstractOne of the most significant observational improvements allowed by the high quality Chandra data of galaxies is the measurement of the nuclear luminosities down to low values, and of the hot ISM properties down to very low gas contents. I present here some recent developements concerning the possibility of accreting and outflowing gas, based on modeling results that take into account the role of a central supermassive black hole (MBH).


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