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Mass Functions of Supermassive Black Holes across Cosmic Time [PDF]

open access: yesAdvances in Astronomy, 2012
The black hole mass function of supermassive black holes describes the evolution of the distribution of black hole mass. It is one of the primary empirical tools available for mapping the growth of supermassive black holes and for constraining ...
Brandon C. Kelly, Andrea Merloni
doaj   +5 more sources

Leptonic and Hadronic Radiative Processes in Supermassive-Black-Hole Jets [PDF]

open access: yesGalaxies, 2020
Supermassive black holes lying in the center of galaxies can launch relativistic jets of plasma along their polar axis. The physics of black-hole jets is a very active research topic in astrophysics, owing to the fact that many questions remain open on ...
Matteo Cerruti
doaj   +3 more sources

Black Holes, Mergers, and the Entropy Budget of the Universe [PDF]

open access: yesJCAP 0311 (2003) 011, 2002
Vast amounts of entropy are produced in black hole formation, and the amount of entropy stored in supermassive black holes at the centers of galaxies is now much greater than the entropy free in the rest of the universe.
Abrahams A M (Binary Black Hole Grand Challenge Alliance Collaboration)   +22 more
core   +3 more sources

Probing supermassive black hole binaries with pulsar timing [PDF]

open access: yesNature Astronomy, volume 3, pages 8-10 (2019), 2019
The detection of a gravitational-wave background at nanohertz frequencies can tell us if and how supermassive black holes merge, and inform our knowledge of galaxy merger rates and supermassive black hole masses. All we have to do is time pulsars.
C. Mingarelli
semanticscholar   +2 more sources

Kretschmann Scalar for a Kerr-Newman Black Hole [PDF]

open access: yes, 1999
I have derived the Kretschmann scalar for a general black hole of mass m, angular momentum per unit mass a, and electric charge Q. The Kretschmann scalar gives the amount of curvature of spacetime, as a function of position near (and within) a black hole.
Henry, Richard C.
core   +4 more sources

Formation of supermassive black hole seeds [PDF]

open access: yesPublications Astronomical Society of Australia, 2016
The detection of quasars at $z>6$ unveils the presence of supermassive black holes (BHs) of a few billion solar masses. The rapid formation process of these extreme objects remains a fascinating and open issue.
Ferrara, Andrea, Latif, Muhammad A.
core   +3 more sources

Black hole shadow with a cosmological constant for cosmological observers

open access: yesEuropean Physical Journal C: Particles and Fields, 2019
We investigate the effect of the cosmological constant on the angular size of a black hole shadow. It is known that the accelerated expansion which is created by the cosmological constant changes the angular size of the black hole shadow for static ...
Javad T. Firouzjaee, Alireza Allahyari
doaj   +3 more sources

The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background [PDF]

open access: yesAstrophysical Journal Letters, 2023
The NANOGrav 15 yr data set shows evidence for the presence of a low-frequency gravitational-wave background (GWB). While many physical processes can source such low-frequency gravitational waves, here we analyze the signal as coming from a population of
G. Agazie   +113 more
semanticscholar   +1 more source

The NANOGrav 15 yr Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries [PDF]

open access: yesAstrophysical Journal Letters, 2023
Evidence for a low-frequency stochastic gravitational-wave background has recently been reported based on analyses of pulsar timing array data. The most likely source of such a background is a population of supermassive black hole binaries, the loudest ...
G. Agazie   +98 more
semanticscholar   +1 more source

First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way [PDF]

open access: yes, 2023
We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A$^*$), the Galactic center source associated with a supermassive black hole.
K. Akiyama   +387 more
semanticscholar   +1 more source

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