Baryons in the relativistic jets of the stellar-mass black-hole candidate 4U 1630-47

We study the properties of the faint X-ray activity of Galactic transient black hole candidate XTE J1908+094 during its 2019 outburst. Here, we report the results of detailed spectral and temporal analysis during this outburst using observations from Nuclear Spectroscopic Telescope Array (NuSTAR). We have not observed any quasi-periodic-oscillations (QPOs) in the power density spectrum (PDS). The spectral study suggests that the source remained in the softer (more precisely, in the soft–intermediate) spectral state during this short period of X-ray activity. We notice a faint but broad Fe Kα emission line at around 6.5 keV. We also estimate the probable mass of the black hole to be 6.5−0.7+0.5M⊙, with 90% confidence.

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Substructure in black hole scaling diagrams and implications for the coevolution of black holes and galaxies

Proceedings of the International Astronomical Union ◽

10.1017/s1743921320001726 ◽

2019 ◽

Vol 15 (S359) ◽

pp. 37-39

Author(s):

Benjamin L. Davis ◽

Nandini Sahu ◽

Alister W. Graham

Keyword(s):

Black Hole ◽

Stellar Mass ◽

Host Galaxy ◽

Scaling Relations ◽

Black Hole Mass ◽

Physical Processes ◽

Stellar Velocity ◽

Galaxy Sample ◽

Evolutionary Paths ◽

Black Hole Masses

AbstractOur multi-component photometric decomposition of the largest galaxy sample to date with dynamically-measured black hole masses nearly doubles the number of such galaxies. We have discovered substantially modified scaling relations between the black hole mass and the host galaxy properties, including the spheroid (bulge) stellar mass, the total galaxy stellar mass, and the central stellar velocity dispersion. These refinements partly arose because we were able to explore the scaling relations for various sub-populations of galaxies built by different physical processes, as traced by the presence of a disk, early-type versus late-type galaxies, or a Sérsic versus core-Sérsic spheroid light profile. The new relations appear fundamentally linked with the evolutionary paths followed by galaxies, and they have ramifications for simulations and formation theories involving both quenching and accretion.

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A Variable Ultraluminous Supersoft X‐Ray Source in “The Antennae”: Stellar‐Mass Black Hole or White Dwarf?

The Astrophysical Journal ◽

10.1086/375441 ◽

2003 ◽

Vol 591 (2) ◽

pp. 843-849 ◽

Cited By ~ 53

Author(s):

G. Fabbiano ◽

A. R. King ◽

A. Zezas ◽

T. J. Ponman ◽

A. Rots ◽

...

Keyword(s):

Black Hole ◽

White Dwarf ◽

Stellar Mass ◽

X Ray

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ON MAGNETIC SELF-COLLIMATION OF RELATIVISTIC JETS

International Journal of Modern Physics D ◽

10.1142/s0218271810017068 ◽

2010 ◽

Vol 19 (06) ◽

pp. 689-694

Author(s):

N. GLOBUS ◽

V. CAYATTE ◽

C. SAUTY

Keyword(s):

Black Hole ◽

Total Energy ◽

Ideal Fluid ◽

Polar Axis ◽

Kerr Metric ◽

Relativistic Jets ◽

Simple Criterion ◽

General Relativistic ◽

Time Splitting ◽

Relativistic Magnetohydrodynamics

We present a semi-analytical model using the equations of general relativistic magnetohydrodynamics (GRMHD) for jets emitted by a rotating black hole. We assume steady axisymmetric outflows of a relativistic ideal fluid in Kerr metrics. We express the conservation equations in the frame of the FIDucial Observer (FIDO or ZAMO) using a 3+1 space–time splitting. Calculating the total energy variation between a non-polar field line and the polar axis, we extend to the Kerr metric the simple criterion for the magnetic collimation of jets obtained for a nonrotating black hole by Meliani et al.10 We show that the black role rotation induced a more efficient magnetic collimation of the jet.

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