scholarly journals Tests of general relativity with stellar-mass black hole binaries observed by LISA

2020 ◽  
Vol 101 (10) ◽  
Author(s):  
Alexandre Toubiana ◽  
Sylvain Marsat ◽  
Stanislav Babak ◽  
Enrico Barausse ◽  
John Baker
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Stellar Mass ◽  
Black Hole Binaries ◽  
Tests Of General Relativity

scholarly journals Universal interferometric signatures of a black hole’s photon ring

2020 ◽  
Vol 6 (12) ◽  
pp. eaaz1310 ◽  
Author(s):  
Michael D. Johnson ◽  
Alexandru Lupsasca ◽  
Andrew Strominger ◽  
George N. Wong ◽  
Shahar Hadar ◽  
...  
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Event Horizon ◽  
Infinite Sequence ◽  
High Order ◽  
Black Hole Mass ◽  
Tests Of General Relativity ◽  
Supermassive Black Hole ◽  
The Galaxy ◽  
Self Similar

The Event Horizon Telescope image of the supermassive black hole in the galaxy M87 is dominated by a bright, unresolved ring. General relativity predicts that embedded within this image lies a thin “photon ring,” which is composed of an infinite sequence of self-similar subrings that are indexed by the number of photon orbits around the black hole. The subrings approach the edge of the black hole “shadow,” becoming exponentially narrower but weaker with increasing orbit number, with seemingly negligible contributions from high-order subrings. Here, we show that these subrings produce strong and universal signatures on long interferometric baselines. These signatures offer the possibility of precise measurements of black hole mass and spin, as well as tests of general relativity, using only a sparse interferometric array.

scholarly journals Warm and thick corona for a magnetically supported disk in galactic black hole binaries

2020 ◽  
Vol 633 ◽  
pp. A35 ◽  
Author(s):  
D. Gronkiewicz ◽  
A. Różańska
Keyword(s):  
Magnetic Field ◽  
Black Hole ◽  
Accretion Disk ◽  
Thermal Instability ◽  
Stellar Mass ◽  
Rotational Instability ◽  
X Ray ◽  
Black Hole Binaries ◽  
Radiative Processes ◽  
Gas Heating

Context. We self-consistently model a magnetically supported accretion disk around a stellar-mass black hole with a warm optically thick corona based on first principles. We consider the gas heating by magneto-rotational instability dynamo. Aims. Our goal is to show that the proper calculation of the gas heating by magnetic dynamo can build up the warm optically thick corona above the accretion disk around a black hole of stellar mass. Methods. Using the vertical model of the disk supported and heated by the magnetic field together with radiative transfer in hydrostatic and radiative equilibrium, we developed a relaxation numerical scheme that allowed us to compute the transition form the disk to corona in a self-consistent way. Results. We demonstrate here that the warm (up to 5 keV) optically thick (up to 10 τes) Compton-cooled corona can form as a result of magnetic heating. A warm corona like this is stronger in the case of the higher accretion rate and the greater magnetic field strength. The radial extent of the warm corona is limited by local thermal instability, which purely depends on radiative processes. The obtained coronal parameters are in agreement with those constrained from X-ray observations. Conclusions. A warm magnetically supported corona tends to appear in the inner disk regions. It may be responsible for soft X-ray excess seen in accreting sources. For lower accretion rates and weaker magnetic field parameters, thermal instability prevents a warm corona, giving rise to eventual clumpiness or ionized outflow.

scholarly journals Galactic center pulsar as a test of black hole existence and properties

1979 ◽  
Vol 84 ◽  
pp. 401-404
Author(s):  
B. Paczyński ◽  
V. Trimble
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Galactic Center ◽  
Strong Field ◽  
Field Tests ◽  
Central Black Hole ◽  
X Ray ◽  
Tests Of General Relativity ◽  
Period Orbit ◽  
Short Period

There is a reasonable chance of finding a (probably X-ray) pulsar in a short-period orbit around the galactic center. Such a pulsar can provide a test distinguishing a central black hole from a supermassive object or spinar. It also makes available a good clock in a region of space in which GM/Rc2 is much larger than solar system values, thus allowing strong-field tests of general relativity.

scholarly journals Supermassive black hole tests of general relativity with eLISA

2015 ◽  
Vol 91 (2) ◽  
Author(s):  
Cédric Huwyler ◽  
Edward K. Porter ◽  
Philippe Jetzer
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Tests Of General Relativity ◽  
Supermassive Black Hole

scholarly journals Spin Evolution of Stellar-mass Black Hole Binaries in Active Galactic Nuclei

2020 ◽  
Vol 899 (1) ◽  
pp. 26 ◽  
Author(s):  
Hiromichi Tagawa ◽  
Zoltán Haiman ◽  
Imre Bartos ◽  
Bence Kocsis
Keyword(s):  
Black Hole ◽  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Stellar Mass ◽  
Black Hole Binaries ◽  
Spin Evolution

scholarly journals Tests of general relativity with the binary black hole signals from the LIGO-Virgo catalog GWTC-1

2019 ◽  
Vol 100 (10) ◽  
Author(s):  
B. P. Abbott ◽  
R. Abbott ◽  
T. D. Abbott ◽  
S. Abraham ◽  
F. Acernese ◽  
...  
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Tests Of General Relativity ◽  
Binary Black Hole

scholarly journals Testing General Relativity with the Stellar-mass Black Hole in LMC X-1 Using the Continuum-fitting Method

2020 ◽  
Vol 897 (1) ◽  
pp. 84 ◽  
Author(s):  
Ashutosh Tripathi ◽  
Menglei Zhou ◽  
Askar B. Abdikamalov ◽  
Dimitry Ayzenberg ◽  
Cosimo Bambi ◽  
...  
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Stellar Mass ◽  
Fitting Method ◽  
The Continuum

scholarly journals mocca-survey Database I: Binary black hole mergers from globular clusters with intermediate mass black holes

2020 ◽  
Vol 498 (3) ◽  
pp. 4287-4294
Author(s):  
Jongsuk Hong ◽  
Abbas Askar ◽  
Mirek Giersz ◽  
Arkadiusz Hypki ◽  
Suk-Jin Yoon
Keyword(s):  
Black Holes ◽  
Black Hole ◽  
Gravitational Waves ◽  
Globular Clusters ◽  
Stellar Mass ◽  
Intermediate Mass ◽  
Binary Black Holes ◽  
Black Hole Binaries ◽  
Binary Black Hole ◽  
Intermediate Mass Black Holes

ABSTRACT The dynamical formation of black hole binaries in globular clusters that merge due to gravitational waves occurs more frequently in higher stellar density. Meanwhile, the probability to form intermediate mass black holes (IMBHs) also increases with the density. To explore the impact of the formation and growth of IMBHs on the population of stellar mass black hole binaries from globular clusters, we analyse the existing large survey of Monte Carlo globular cluster simulation data (mocca-survey Database I). We show that the number of binary black hole mergers agrees with the prediction based on clusters’ initial properties when the IMBH mass is not massive enough or the IMBH seed forms at a later time. However, binary black hole formation and subsequent merger events are significantly reduced compared to the prediction when the present-day IMBH mass is more massive than ${\sim}10^4\, \rm M_{\odot }$ or the present-day IMBH mass exceeds about 1 per cent of cluster’s initial total mass. By examining the maximum black hole mass in the system at the moment of black hole binary escaping, we find that ∼90 per cent of the merging binary black holes escape before the formation and growth of the IMBH. Furthermore, large fraction of stellar mass black holes are merged into the IMBH or escape as single black holes from globular clusters in cases of massive IMBHs, which can lead to the significant underpopulation of binary black holes merging with gravitational waves by a factor of 2 depending on the clusters’ initial distributions.

scholarly journals Mining for Candidates of Galactic Stellar-mass Black Hole Binaries with LAMOST

2019 ◽  
Vol 886 (2) ◽  
pp. 97 ◽  
Author(s):  
Tuan Yi ◽  
Mouyuan Sun ◽  
Wei-Min Gu
Keyword(s):  
Black Hole ◽  
Stellar Mass ◽  
Black Hole Binaries

scholarly journals Stellar-mass black hole binaries as ultraluminous X-ray sources

2005 ◽  
Vol 356 (2) ◽  
pp. 401-414 ◽  
Author(s):  
S. A. Rappaport ◽  
Ph. Podsiadlowski ◽  
E. Pfahl
Keyword(s):  
Black Hole ◽  
Stellar Mass ◽  
X Ray ◽  
Black Hole Binaries
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