Clumpy wind accretion in supergiant neutron star high mass X
... of a massive clump onto the NS would produce in this scenario bright and short X-ray outbursts, as the duration of the event is related to the lateral size of the clump while the total luminosity is directly proportional to its mass. Less luminous flares can be explained by invoking a reasonable dis ...
... of a massive clump onto the NS would produce in this scenario bright and short X-ray outbursts, as the duration of the event is related to the lateral size of the clump while the total luminosity is directly proportional to its mass. Less luminous flares can be explained by invoking a reasonable dis ...
- UCL Discovery
... I would like to thank Lidia van Driel-Geszteyli and Dave Long for being two of the loveliest supervisors I could have asked for. It has been an absolute pleasure to work with them both and with Pascal Démoulin, who has contributed so much to my work and provided so much insight. Thanks to Pascal an ...
... I would like to thank Lidia van Driel-Geszteyli and Dave Long for being two of the loveliest supervisors I could have asked for. It has been an absolute pleasure to work with them both and with Pascal Démoulin, who has contributed so much to my work and provided so much insight. Thanks to Pascal an ...
Accreting Neutron Stars: Strong Gravity and Type I Bursts
... processes, and the conductivity of the crust. These in turn depend on the composition and EOS (see Rutledge et al., 2002; Brown & Cumming, 2009, for a theoretical discussion, and Wijnands et al., 2012 for observational references). If the distance is known, it may even be possible to infer the radiu ...
... processes, and the conductivity of the crust. These in turn depend on the composition and EOS (see Rutledge et al., 2002; Brown & Cumming, 2009, for a theoretical discussion, and Wijnands et al., 2012 for observational references). If the distance is known, it may even be possible to infer the radiu ...
Dynamical friction in disc galaxies with non
... therefore expressed concern that the agreement they found between theory and experiments might have been partly due to a cancellation between several effects of the velocity dispersion. There is thus a need for a more detailed analysis of the effect of the velocity dispersion on the dynamical fricti ...
... therefore expressed concern that the agreement they found between theory and experiments might have been partly due to a cancellation between several effects of the velocity dispersion. There is thus a need for a more detailed analysis of the effect of the velocity dispersion on the dynamical fricti ...
The Solar Tachocline: A Self-Consistent Model of Magnetic
... Hence a retrograde applied torque, for example, will “gyroscopically pump” a flow toward the rotation axis. Viewed in an inertial (i.e. non-rotating) frame of reference, the fluid spirals in toward the rotation axis; the orbital decay of satellites is an analogous process. Since the fluid must conse ...
... Hence a retrograde applied torque, for example, will “gyroscopically pump” a flow toward the rotation axis. Viewed in an inertial (i.e. non-rotating) frame of reference, the fluid spirals in toward the rotation axis; the orbital decay of satellites is an analogous process. Since the fluid must conse ...
Chapter 1 Introduction: Matter and Measurement
... substances to separate a homogeneous mixture into its components. Matter And Measurement © 2009, Prentice-Hall, Inc. ...
... substances to separate a homogeneous mixture into its components. Matter And Measurement © 2009, Prentice-Hall, Inc. ...
Gyrophase diffusion of charged particles in random magnetic fields
... If charged particles propagate through a magnetized plasma, they experience different scattering effects. Well-known effects that have been studied previously include spatial diffusion and pitch-angle scattering as well as stochastic acceleration. So-called gyrophase diffusion, which describes stoch ...
... If charged particles propagate through a magnetized plasma, they experience different scattering effects. Well-known effects that have been studied previously include spatial diffusion and pitch-angle scattering as well as stochastic acceleration. So-called gyrophase diffusion, which describes stoch ...
radiation and matter interaction in strong magnetic field of accreting
... understanding of the processes in the early Universe (Raffelt, 1996). Extreme conditions, including high temperature and density as well as strong electromagnetic fields, affect the quantum processes. Extreme conditions can also intensify some processes or even make some of them possible, like it ha ...
... understanding of the processes in the early Universe (Raffelt, 1996). Extreme conditions, including high temperature and density as well as strong electromagnetic fields, affect the quantum processes. Extreme conditions can also intensify some processes or even make some of them possible, like it ha ...
on the rotational dynamics of magnetically threaded disks around
... velocity between the Keplerian disk and the magnetosphere leads to huge field twisting on the corona-disk boundary. This gives rise to the generation of very large toroidal field and to strong magnetic braking of the disk. A differentially rotating, matter-dominated corona is an appropriate initial ...
... velocity between the Keplerian disk and the magnetosphere leads to huge field twisting on the corona-disk boundary. This gives rise to the generation of very large toroidal field and to strong magnetic braking of the disk. A differentially rotating, matter-dominated corona is an appropriate initial ...
KINEMATIC MEASUREMENTS OF GAS AND STARS IN SPIRAL
... good example of these properties is the kinematic information on NGC 470, in fact classified as Sbc, obtained with a long slit spectrum along its major axis, as shown in Figure 4 (from [12]). We can see good agreements between the rotation curves, and dispersion values in general below 100 km s−1 , ...
... good example of these properties is the kinematic information on NGC 470, in fact classified as Sbc, obtained with a long slit spectrum along its major axis, as shown in Figure 4 (from [12]). We can see good agreements between the rotation curves, and dispersion values in general below 100 km s−1 , ...
ASTRONOMY AND ASTROPHYSICS Numerical simulations of stellar winds: polytropic models
... for steady-state, transonic MHD flows are of mixed-type, their character can change from elliptic to hyperbolic at a priori undetermined internal critical surfaces. Causality arguments have been used to discuss which and how many boundary conditions must be prescribed (Bogovalov 1997). Our choice of ...
... for steady-state, transonic MHD flows are of mixed-type, their character can change from elliptic to hyperbolic at a priori undetermined internal critical surfaces. Causality arguments have been used to discuss which and how many boundary conditions must be prescribed (Bogovalov 1997). Our choice of ...
Analytical estimates of the resistivity due to ion
... 3. At wave saturation, the anomalous resistivity for a Lorentzian DF can be an order of magnitude higher than that for a Maxwellian DF, even when the drift velocity and current density for the Maxwellian case are larger. 4. The anomalous resistivity resulting from ion acoustic waves in a Lorentzian ...
... 3. At wave saturation, the anomalous resistivity for a Lorentzian DF can be an order of magnitude higher than that for a Maxwellian DF, even when the drift velocity and current density for the Maxwellian case are larger. 4. The anomalous resistivity resulting from ion acoustic waves in a Lorentzian ...
Thermal conduction effects on the kink instability in coronal loops
... therefore, assuming that the thermal conduction out of our computational domain will lead to radiation from the transition region/chromosphere but that this will not significantly feedback on to our coronal solution. The equations are made dimensionless by using the normalisation coefficients B20 ...
... therefore, assuming that the thermal conduction out of our computational domain will lead to radiation from the transition region/chromosphere but that this will not significantly feedback on to our coronal solution. The equations are made dimensionless by using the normalisation coefficients B20 ...
Further VLBA Observations of SiO Masers toward Mira
... the Mira variable stars reported in Cotton et al. (2004) (o Ceti=Mira, U Orionis=U Ori, R Aquarii=R Aqr) over a period of 16 months, extending the observations to several pulsation cycles. The observed size of the maser rings varied by 3-14% with time but show no clear correlation with pulsation pha ...
... the Mira variable stars reported in Cotton et al. (2004) (o Ceti=Mira, U Orionis=U Ori, R Aquarii=R Aqr) over a period of 16 months, extending the observations to several pulsation cycles. The observed size of the maser rings varied by 3-14% with time but show no clear correlation with pulsation pha ...
Chandra HETGS Multiphase Spectroscopy Of The Young
... Montmerle model leads to a steady state configuration in which a postshock ‘‘cooling disk’’ forms at the magnetic equator. In their model, this disk is essentially an infinite mass sink. This has an effect on the assumed X-ray absorption properties of the disk, and it also affects the steady-state s ...
... Montmerle model leads to a steady state configuration in which a postshock ‘‘cooling disk’’ forms at the magnetic equator. In their model, this disk is essentially an infinite mass sink. This has an effect on the assumed X-ray absorption properties of the disk, and it also affects the steady-state s ...
Magnetic fields in Local Group dwarf irregulars⋆
... power-law exponent of 0.30 ± 0.04) or by the gas surface density (with the exponent 0.47 ± 0.09). In addition, we find systematically stronger fields in objects of higher global star-formation rate. The dwarf galaxies follow a similar far-infrared relationship (with a slope of 0.91 ± 0.08) to that d ...
... power-law exponent of 0.30 ± 0.04) or by the gas surface density (with the exponent 0.47 ± 0.09). In addition, we find systematically stronger fields in objects of higher global star-formation rate. The dwarf galaxies follow a similar far-infrared relationship (with a slope of 0.91 ± 0.08) to that d ...
PHY 380L Introduction to Plasma Physics Richard Fitzpatrick
... also occasionally absorbs and distorts radio waves. For instance, the Earth’s magnetic field causes waves with different polarizations (relative to the orientation of the magnetic field) to propagate at different velocities, an effect which can give rise to “ghost signals” (i.e., signals which arri ...
... also occasionally absorbs and distorts radio waves. For instance, the Earth’s magnetic field causes waves with different polarizations (relative to the orientation of the magnetic field) to propagate at different velocities, an effect which can give rise to “ghost signals” (i.e., signals which arri ...
Slide 1
... • Galaxy redshift = 0.0223 • At 6643Å, rest-frame 6497Å blend line well known to be associated to late G & early K stars – consistent with ~5-6 Gyr old stellar population from ESO 243-49 (Soria et al. 2010) ...
... • Galaxy redshift = 0.0223 • At 6643Å, rest-frame 6497Å blend line well known to be associated to late G & early K stars – consistent with ~5-6 Gyr old stellar population from ESO 243-49 (Soria et al. 2010) ...
Response of equatorial-low latitude ionosphere
... our knowledge, the only work done on this issue subsequently was the study of Araki and Nagano[19S8] using magnetic field measurements on ground and by satellites. Based on the equivalent current systems during the course of si - (derived from groundlevel magnetic recordings), they explained the com ...
... our knowledge, the only work done on this issue subsequently was the study of Araki and Nagano[19S8] using magnetic field measurements on ground and by satellites. Based on the equivalent current systems during the course of si - (derived from groundlevel magnetic recordings), they explained the com ...
THE SPACE WEATHER OF PROXIMA CENTAURI b
... In the case of the Sun, high-quality magnetograms used as the boundary conditions to drive the wind model are routinely obtained in exquisite detail. In the stellar case, we have employed surface magnetic field maps derived using the Zeeman–Doppler Imaging (ZDI) technique (Semel 1980; Donati et al. 1 ...
... In the case of the Sun, high-quality magnetograms used as the boundary conditions to drive the wind model are routinely obtained in exquisite detail. In the stellar case, we have employed surface magnetic field maps derived using the Zeeman–Doppler Imaging (ZDI) technique (Semel 1980; Donati et al. 1 ...
Magnetars: properties, origin and evolution
... by field reconnection events in the magnetosphere analogous to those occurring in the Sun (Lyutikov 2006), or by pair plasma fireballs produced by discontinuities in the propagation of fast MHD waves in the magnetosphere (Heyl & Hernquist 2005). In Section 2 we describe the properties of the so call ...
... by field reconnection events in the magnetosphere analogous to those occurring in the Sun (Lyutikov 2006), or by pair plasma fireballs produced by discontinuities in the propagation of fast MHD waves in the magnetosphere (Heyl & Hernquist 2005). In Section 2 we describe the properties of the so call ...
A single picture for solar coronal outflows and radio noise storms
... The EIS data were processed using custom-written software (see, e.g., Del Zanna 2008b,a). The offset between the SW and LW channels in both N-S (18 ) and E−W (2 ) was corrected for. Some authors have recently found asymmetries in the EIS line profiles, which would question the use of single Gauss ...
... The EIS data were processed using custom-written software (see, e.g., Del Zanna 2008b,a). The offset between the SW and LW channels in both N-S (18 ) and E−W (2 ) was corrected for. Some authors have recently found asymmetries in the EIS line profiles, which would question the use of single Gauss ...
Evolution of magnetic helicity in the course of kinetic magnetic
... is a pure particle effect, due to the different motion of electrons and ions, as predicted by Terasawa (1983). These 2D investigations can be considered as a first step towards a full understanding of kinetic magnetic reconnection. Later, several authors pointed out the intrinsic 3D structure of kin ...
... is a pure particle effect, due to the different motion of electrons and ions, as predicted by Terasawa (1983). These 2D investigations can be considered as a first step towards a full understanding of kinetic magnetic reconnection. Later, several authors pointed out the intrinsic 3D structure of kin ...
Lorentz force velocimetry
Lorentz force velocimetry (LFV) is a noncontact electromagnetic flow measurement technique. LFV is particularly suited for the measurement of velocities in liquid metals like steel or aluminium and is currently under development for metallurgical applications.The measurement of flow velocities in hot and aggressive liquids such as liquid aluminum and molten glass constitutes one of the grand challenges of industrial fluid mechanics. Apart from liquids, LFV can also be used to measure the velocity of solid materials as well as for detection of micro-defects in their structures.A Lorentz force velocimetry system is called Lorentz force flowmeter (LFF). A LFF measures the integrated or bulk Lorentz force resulting from the interaction between a liquid metal in motion and an applied magnetic field. In this case the characteristic length of the magnetic field is of the same order of magnitude as the dimensions of the channel. It must be addressed that in the case where localized magnetic fields are used, it is possible to perform local velocity measurements and thus the term Lorentz force velocimeter is used.