Different theories for the gamma-ray bursts (GRBs) progenitor systems emerged using the observational results, with the leading models involving a compact object merger for the short bursts     and a massive star core collapse (collapsar model)   to a compact object (black hole or neutron star) origin for the long bursts. A new intimation into the progenitors that emit GRBs came from the compact stellar and host galaxy coincidence of GRB 980425 with the supernova SN 1998 bw  that resembles the ordinary Type Ic SN 1994I or the weak version of hypernova, SN 2002ap  and recently observed gravitational wave  .
Beside collapsar and merger progenitor types, the accretion-induced collapse of a rapidly rotating white dwarf and neutron star scenarios is also extensively studied  . Long duration GRBs associated with type Ib/c supernovae (SNe) are powered by collapsars  . The compact binary mergers are the promising sources of short GRBs   . Therefore, main classes of possible progenitors models have been proposed for the origin of gamma-ray bursts are two neutron stars or neutron star-black hole mergers and massive star gravitational core collapse (hypernova). These prospective progenitor system activities capable of producing GRBs involving accretion of a massive ( ) disk onto a newborn black hole can result from the explosion of a massive star core collapse, or following the coalescence of binary compact stellar remnants. In both cases a spinning black hole is formed with torus system, either from the super massive stellar core collapse or from a tidally disrupted neutron star, form a temporary accretion disk or torus which ultimately fall into the black hole, generating a fraction of its gravitational energy that power GRB AGN.
The observed X-ray light curves (Swift-XRT) of GRBs widely compact the sources producing them    . For instance the plateau and the overlying x-ray flare(s) acceptably powered by compact progenitors, identified as gravitational core collapse of a rapidly rotating super massive star   or merged core of compact objects such as double NS, NS-BH or WD-BH   . Based on several observational results the central binary sources of energetic burst emission was identified as gravitational core collapse of super massive star or merged core of 2NSs or NS-BH  as engines for short gamma-ray bursts, which are very efficient at converting high photon energy into luminous radiation. The intrinsic glowing flow of gamma rays emission from rotating, strongly magnetized disk accreting BH formed in dying super-giant stars or compact mergers   typical disclosed, where collapsar or merger explained as prime candidates that form disk accreting black hole in AGN. The entire scenarios basically explained as the observed AGN radiation spectrum. Thus, Gamma-Ray Bursts are primal result of accretion onto black holes.
Our subject of study, a viscous, strongly magnetized disk accreting black hole discussed in  and it was shown that the accretion disk largely characterized by a strong magnetic field, differential rotation and shear-induced turbulent stresses. The accretion torus dynamics is potentially driven by shear stress or convection that results in luminous radiation where angular momentum transport ensures the turbulent disk formation. Previous work has shown that luminous radiation of AGN and X-ray binaries are consistent with magnetized disk shear instability. Moreover, the spectrum of Cyg X-1  associated with Galactic X-ray sources and large luminosity of AGN can be explained by torus disk accretion process  . It is also argued that X-ray flares are produced by magnetar   . Magnetar engine deeply explored in  and the resulting spin-down luminosity compared with that of X-ray emission to shade light on light-curve features. These observed X-ray variability with thermal hard X-ray spectrum component has generally been interpreted as thermal emission from turbulent accretion disk  . But the physical sources of luminous burst radiation have not yet been well settled. Thus, we are intended to study the evolution of rapidly rotating, accreting BH in full general relativity and the relativistic accretion flow in MHD and its numerical calculation with accurate GRMHD code  . We approach the outflow radiation using MHD conserved equations to construct spectrum of radiative heating due to viscous and magnetic dissipation in general relativistic Kerr geometry. We compute the structure of accretion disk, the accretion luminosity of the dynamical evolution of inner accretion disk and precisely determine their radiation spectra.
The aim of this paper is to explore relativistic disk accreting Kerr black hole as the potential central source of gamma ray bursts. We begin with the detailed discussions of merger of compact binaries involving neutron stars and super massive star gravitational core collapse. Particularly, investigating super massive star gravitational core collapse leads to newly formed rapidly spinning, black holes and compact core mergers (perhaps NS-NS and NS-BH). Finally, we infer the radiative heating flux density due to viscous and magnetic energy dissipation in general relativistic Kerr Black Hole. In Section 2 we present a brief description of general relativistic resistive MHD formulations. The relativistic accretion flow in resistive MHD and the resulting radiation basically explained as the X-ray luminosity of the central source explored in Section 3. Finally, in Section 4 we provide a summary and draw the concluding remarks.
2. Relativistic MHD Disk Model
Luminous disk accretion onto rotating black holes general governed by magnetohydrodynamic (MHD) equations. This spinning, magnetized black hole with thin asymmetric turbulent relativistic disk widely simulated and MHD equations are numerically solved   . Then, traditionally the equations of relativistic MHD are given in the conserved form: the mass continuity equation
where is rest mass density, is the 4-velocity of the fluid and is source or sink. The energy-momentum conservation
where, , then stress-energy tensor is
The Einstein tensor and the total stress-energy tensor are related as
and the Ricci tensor
The Maxwell's equations calculated from Faraday tensor follows
using a covariant derivative of a vector ( ) we obtain
is the four-vectorial mass flux-density conservation equations of relativistic fluid including gravity. Taking the dominant part of the radial component we can retrieve
for simplicity we take the equatorial plane, , , and .
this follows from mass accretion rate . The momentum conservation equation for magnetized plasma where matter interacts with electromagnetic field is calculated from partial time derivative of ( ) and the continuity equation
including all magnetorotation instability in resistive MHD: corotation field
the 2nd term is from magnetic tension force. Similarly, the equation of energy conservation follows from the partial time derivative of the total internal energy density (energy per unit mass) of the fluid
comprising kinetic, the internal specific enthalpy, magnetic and potential energies, respectively. Thus, the energy conservation equation is then
is the total energy flux and consists of the macroscopic transport of the total energy with velocity, the work done by the pressure and magnetic forces and vector is the net thermal heat flux exchanged by the element of fluid per unit time per unit area,
represents energy transport equation. The pressure is with partial differential
These fundamental general relativistic MHD conservation equations can be expressed as a hyperbolic, first-order, flux-conservative partial differential equation
where denotes a state vector as function of MHD conserved variables ( ) and is the flux vector, with the five-dimensional state vector , which are a system of hyperbolic partial differential equations. The flux vector is
where is Poynting flux and , are magnetic field in fluid’s rest frame. The source term is also
summarizes the evolution equations for the magnetohydrodynamic variables with conserved variables: , , , . Here, specific enthalpy from stress-energy tensor and from which magnetic pressure is obtained. Hence, compactly set by Jacobian determinant
where is Jacobian matrix. For column matrix of flux we can have
in the sense of linearized perturbations, that is lower terms of Equation (15), simplified over index i = 1, 2, 3 gives us
imprecisely maintain the flow equation in cylindrical coordinate
including resistive term in the magnetized plasma. Therefore the conservative formulation Equation (14) has the general synthetic solution of the form
where and . The integration can be solved analytically or numerically, where partial differential equation solver can be applied. Such numerically calculations are largely applied to MHD equations  .
3. Disk Accretion Luminosity
The amount of energy dissipation and angular momentum transfer typical determine the accretion disk efficiency to convert gravitational energy into luminous radiation. The conservation of angular momentum prevents matter from falling directly into the hole in directions perpendicular to the rotation axis by centrifugal forces. The gas can, however, crumple along the rotation axis of the in falling torus so that a luminous disk of debris forms surrounding the hole, which is largely characterized by strong magnetic field, differential rotation and shear-induced turbulent stresses. The matter in this turbulent accretion disk can only fall into the rotating black hole if it loses angular momentum by turbulent stresses (strong magnetic or viscous forces) acting on the disk. Matter accreted from a geometrically thin disk reach the most stable inner circular orbit of radius and continues freely falling into the chasm of black hole. Luminous radiation generated when debris of disk accreted into the black hole.
Using viscosity priscription  for gravitationally unstable rotating, relativistic thin and axisymmetric disk, the vertically averaged surface density ( ) is defined as the mass per unit surface area of the disk, given by integrating the gas density in the z-direction
where, H is the scale height, when the gravitational force balanced with the vertical pressure gradient
is the disk half-thickness at radius r. Since , the condition for height-integrated thin disk. We must have and so the rotation of the disk is highly supersonic. Here for axisymmetric flows, cylindrical coordinates are employed with the z-axis chosen as the axis of rotation and the central plane of the disk lies in the equatorial plane of the kerr hole at . It follows that the rate of mass flowing inward is readily integrated from mass conservation in equilibrium
integrating to = constant. Here is the inward flux of material and the mass accretion rate will be
a small inflow radial “drift” velocity is negative near the horizon, so that matter is being accreted. Since the fluid particles can experience magnetic resistive and viscous dissipation, the constraint equation is
The whole accretion torus within accretion radius (outer edge of the disk) rotates about the hole with specific angular momentum of a circular disk
is the radius where the outer edge of the disk forms.
Similarly, the angular momemtum conservation with viscous-stress tensor uniquely determines viscous accretion disk
The general form, including the viscous-stress tensor term ( ), simply expressed as
where is force density and
or we can typically express as
where the viscous stress tensor (force density) has components
is the dynamic or shear viscosity coefficient, usual known in kinetic molucler theory. Where we get the component —a tangential viscous force per unit area exerted by the disk inside accretion radius:
acts over an area ( ) of the disk for from mass continuity equation. And Equation (28) will be
where is kinematic viscosity. The disk tori in accretion radius
rotates more rapidly and experiences a backward torque acting on the disk outside capture radius due to friction between adjacent layers of fluid elements generates a torque that carries angular momentum outwards.
is the torque generated by shear viscosity and magnetic forces, resulting in viscosity dominated turbulent magnetohydrodynamical stresses, where shear flows are stabilized by either differential rotation or strong magnetic fields. The gas spiral inwards and gradually loses angular momentum with transport rate through viscous force while the fluid outside capture radius gains the angular momentum. where is resistive (friction) coefficient in the fluid flows and is thrust: a force applied perpendicular to the area and . Thus, the component of the momentum equation is
Here are the non-negligible components of in the disk's coordinates. Hence, using in (33) gives
integrating over z gives
where with increased pressure (stiff equation of state  ). Using surface density, Equation (20), we can rewrite
The gradient of specific angular momemtum is the internal torques generated by shear viscosity and magnetic forces, resulting in viscosity dominated turbulent magnetohydrodynamical stresses. The radial component of angular momentum also determined as
The strongest viscous force exerted between two adjacent annulus of the disk is component of the stress tensor, thus we shall assume that . Equation (27) then simplifies to
where . Equation (39) states simply the radial hydrostatic pressure balance. Vertical gradients in the azimuthal field create vertical magnetic pressure gradients for an incompressible flow, are balanced by vertical fluid pressure gradients.
Using energy conservation equation we obtain the radiation energies emitted by accretion torus of rapidly spinning black hole. The basic equation for thin disk follows, from energy conservation Equation (13) is
but consider various formulations of viscous stress tensor
gives pressure ( ) and viscous ( ) work. Heating due to viscous dissipation reduces kinetic energy.
Thus, the work on the disk due to forces on disk area is
substituting into (40) we get
for axisymmetric thin disk approximation , imply that
simple form for internal energy equation
advection first term and the work done by due to radiation , where radiation is due to viscous dissipation . Hence,
Indeed, the steady-state mass conservation equation ensure
where we are left with gradient of magnetic & turbulent viscosities result in gradient of energy flux density. Thus,
Equation (43) encompasses the differential rotation term ( ), strong magnetic field ( ), meridional circulation term ( ) and shear induced turbulence term ( ) in the relativistic radiative MHD balanced with gradient of energy flux density ( ). The heat diffuses toward the top and bottom surfaces of the disk where it is radiated away. Actually, the energy dissipated into heat due to viscousity is radiated in the vertical direction and radiation emitted along vertical midline from both surfaces of the disk (e.g. turbulent transport across sheared flows). Thus, we have vertical viscous dissipation per unit area (energy flux density ) of disk surfaces given by
with (30) and assuming Keplerian tangential velocity this becomes
with the help of (20) and (30), we generally determine vertical radiation energy flux density due to viscous dissipation as
is the rate of energy dissipation per unit volume due to the work done by the viscous forces. We know that torque is rate of change of angular momentum
with (32) we will determine equality as
where, and solving for
substituting into (45) we express radiation energy flux in terms of mass accretion rate as
is the rate of energy dissipation due to viscous forces. The maximum amount of heat is radiated away from the surfaces of the disk before matter accreted into the kerr hole. To determine the power of this radiation, consider a mass of luminous torus falling from disk into the gravitational field of a rapidly rotating massive black hole with mass . Therefore, integrating (48) over the two faces of the disk determine the total accretion power
establishes a maximal black hole disk accretion luminosity
the energy per unit time dissipated in an annulus of width H.
The relativistic disk model parameters are: the black hole mass, , and Kerr rotation parameter a, the mass accretion rate, , the inner and outer radii of the disk. Figure 1 summarizes disk luminosity with range of mass accretion rate, , and initial . Radiation luminosity drops as we go away from the black hole; for disk accretion rate of 1, we obtain the accretion luminosity as less as 1028 erg/s at , shown in Figure 1. But, for disk accretion rate of , we obtain very high accretion luminosity comparable to Eddington luminosity (~1037 ergs/s) at . An accretion rates generate luminosity ~1037 ergs/s. When accretion rate increases, the luminosity linearly grows. The spectral flux was computed for a model with , , , and and obtained an accretion disk spectra with variations in black hole spin ( , 0.7 and 0.998.), i.e., rotation influenced flux as shown in Figure 2. These indicate that highly spinning black hole binaries emit shortest wavelength, energetic radiation (see Figure 2).
Figure 1. The accretion luminosity versus disk accretion rate at different values of innermost stable circular orbit radius ( ).
Figure 2. Flux density spectrum versus shortest wavelength emitted by a thin accretion disk around a rotating black hole at different values of Kerr rotation parameters a = 0.37, 0.7 and 0.998.
Thus, expressing the flux vector MHD Equation (14) in terms of the density terms, we formulate the general partial differential equations as
where y represents flux terms and x represents density terms such as mass, momentum and energy densities. Setting arbitrary function of source or sink, we obtain the radiation flux as
where, and represents shear induced turbulant stresses with magneto-rotational instability enhance disk turbulence. In general, Poynting and radiation fluxes largely contribute to the luminosity
with specific energy density ratio
The ratio is the magnetization function of magnetic flux.
4. Results and Discussion
We have studied the evolution of accreting BH in full general relativity including, imperfect MHD for viscous radiation. The relativistic accretion flow in resistive MHD and the resulting radiation basically explained as the X-ray luminosity of the central source, such as LMC X-1 and GRO J1655-40. LMC X-1 is a luminous X-ray source in the Large Magellanic Cloud (LMC). These results are interestingly consistent with observational data of galactic X-ray source binaries such as Cyg X-1, Cyg X-3 and Seyfert galaxies (NGC 3783, NGC 4151, NGC 4486 (Messier 87)). They are powerful emitters in X-ray and γ-ray wavebands. The spectrum of the observed hard X-ray flux exponential decays with energy is shown in Figure 3. The large luminosity of AGN (1046 erg/s) with the shortest wavelength can be explained by torus disk accretion process and accounts for observed X-ray rapid variability in the erratic light curves. The thin disk accretion onto extremely spinning magnetized BH is the likely source of high energy from binary X-ray sources. Typical X-ray source binary systems: Cyg X-1, LMC X-1, Cen X-3 (X-ray binary pulsar) and Cyg X-3 (X-ray luminosity of ~1031 J/s). The emission of X-ray flux is of synchrotron nature. For instance, the hard X-ray spectrum of the binary X-ray source Hercules X-1, as observed by the Ginga satellite displays synchrotron absorption at 35keV in high-intensity X-ray interaction with matter, shown in Figure 4.
Figure 3. The luminosity flux spectrum of MHD disk radiation with magnetic, dynamical and gas pressure components. Steep decaying energy density (i.e. magnetic flux densities). Where magnetic flux densities, dynamical energy density and is the X-ray spectrum of X-ray binary Black Hole (Sco X-1). The X-ray differential energy spectrum in 10 - 103 KeV.
Figure 4. Frequency distribution of radiated energy flux density. The emission of X-ray and γ-ray fluxes are of synchrotron radiation type.
4.1. Thin Accretion Disk Radiation
Thin accretion disk luminosity as blackbody radiation with inner disk temperatures . A turbulent accreting disk emission
spectrum consistent with the broad blackbody spectra (see 4) and also match to the synchrotron spectrum. For instance, the spectrum of Cyg X-1  is the superposition of synchrotron radiation power law decay and blackbody spectrum with spectral luminosity in the high frequency range. The luminosity spectrum of the disk can be approximated as a blackbody (Figure 4). The typical gas temperatures of 107 K at inner most radius made the flux is emitted from the inner face of the disk. At the inner disk boundary the local spectra contain an excess of high-energy photons in X-ray range (1017 Hz) display huge X-ray emission which can be fitted to observe X-ray data. As a result, the spectra obtained from a thin accretion disk around a Kerr black hole contains an energy maximum in the frequency range of the strong thermal X-ray sources. The radiation spectrum from an accretion disk around a Kerr black hole consistent with the observed spectrum of X-ray sources candidates. The spectral flux were computed for , , , and and obtained an accretion disk spectra with variations in black hole spin ( , 0.7 and 0.998.), i.e., rotation influence flux. For extremelly spinning ( ) Kerr black hole, . The black hole mass and spin, the accretion rate, the disk inclination angle and the inner disk radius are defining parameters of disk luminosity. The X-ray spectra of black hole binaries observed so far, LMC X-1, GRO J1655-40, PSO J334+01 spectrum significantly infer disk accreting Kerr hole. The model then anticipates that geometrically thin, optically thick disks in black hole binaries radiate X-rays (3 × 1016 Hz). The structure of the radio lobes observed in super-critical PSO J334+01 spectrum significantly infer massive BH coalescence. At high frequencies, scattering opacity effects are useful and result in a modified Wien spectrum. For high accretion rate ( ) and viscous alpha spectrum peak appears in the soft X-ray range, where disk becomes optically thin. The high-energy photons at and the disk rotation shifts up to the photon frequencies determine all flux frequency band of a thin accretion disk (see Figure 4) and at high γ-ray energy the spectrum is steepy exponential decay form. For example, the X-ray continuum of binary X-ray pulsars is characterized by a power-law of photon index of α = 0.3 - 2 with an exponential cuttoff at high energies (MeV), because light-curve features (plateau and the flare) are constrainted by high energy emission. Therefore, a significant amount of the total flux is emitted in the soft X-ray range. Most of the flux is emitted in the UV band ( ) up to the X-ray range ( ) at typical gas temperature of from . These estimates are sufficient for modeling the majority of accretion disk spectra from observed black hole X-ray bursts. A black hole with mass emits X-ray luminosities of 1047 erg/s identified.
We have summarized that high-energy GRBs generated by rotating black hole-accretion disk system. Basic analyses of Figure 1 deduce that accretion luminosity drops as we go away from the central Kerr black hole. This probes the energy injection that generates plateau phase as well as x-ray flares. The radiation flux as function of emitted photon frequency and energy density explained the engine as accreting compact binary galactic X-ray emitters. The observed luminosity in X-ray ranges for active galactic nuclei tell us, hard X-ray emission from galactic compact binary systems, typical X-ray source binaries, scorpius X-1  . Early X-ray light curve components with large luminosities imply accretion disk radiation of these progenitors where, the total flux is emitted in the soft X-ray energy range shown in Figure 3. Thin disk radiates locally as a blackbody above critical frequency as shown in Figure 3, indicate that the total flux is emitted in the soft X-ray range at high frequency due to Poynting, magnetic and radiation pressure fluxes as studied in Equation (51) and the result shown in Figure 3. The spectral evolution resembles that of high energy particle acceleration. Particularly, synchrotron and multi-colour blackbody contribution (see Figure 4). The electron energy distribution in the most stable inner radius ( ) gets hotter due to transition of bulk kinetic energy into thermal energy, following a power-law distribution. The synchrotron spectrum slopes as at low frequencies and scales as ( ), where is the power-law index for the energy distribution of electrons. High Lorentz factor electrons cool more rapidly, and this causes a break in the synchrotron spectrum at a critical cooling frequency .
I thank Addis Ababa University, Jijiga University and Adama Science and Technlogy University for all support made.
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