Mass Estimate of Black Hole Candidates GRS 1758
... Santa Cruz Institute for Particle Physics Seminar May 23, 2006 ...
... Santa Cruz Institute for Particle Physics Seminar May 23, 2006 ...
Discovery of the optical counterpart to the X
... contains several strong diffuse interstellar bands (DIB), which can be used to estimate the amount of interstellar absorption toward the source (Herbig 1975; Herbig & Leka 1991; Galazutdinov et al. 2000). Table 3 summarises the measurements of the equivalent width and the corresponding estimated val ...
... contains several strong diffuse interstellar bands (DIB), which can be used to estimate the amount of interstellar absorption toward the source (Herbig 1975; Herbig & Leka 1991; Galazutdinov et al. 2000). Table 3 summarises the measurements of the equivalent width and the corresponding estimated val ...
Observational Overview
... We can see galaxies through the integrated light of their constituent stars. Galaxies that shine through starlight are called normal galaxies and can be observed to distances of a few thousand Mpc. In the 1940’s, it was realised by astronomer Carl Seyfert that the light output from some galaxies was ...
... We can see galaxies through the integrated light of their constituent stars. Galaxies that shine through starlight are called normal galaxies and can be observed to distances of a few thousand Mpc. In the 1940’s, it was realised by astronomer Carl Seyfert that the light output from some galaxies was ...
Neutrino hot dark matter and hydrodynamics of structure formation
... • Lynden Bell: violent relaxation, faster than collisional • Relaxation in time-dependent potential: every object (individual particle, galaxy) exchanges energy with the whole cluster • Iff phase space density becomes uniform, then Fermi-Dirac distribution • X-ray radiation helps to maintain the vir ...
... • Lynden Bell: violent relaxation, faster than collisional • Relaxation in time-dependent potential: every object (individual particle, galaxy) exchanges energy with the whole cluster • Iff phase space density becomes uniform, then Fermi-Dirac distribution • X-ray radiation helps to maintain the vir ...
Chapter 21 Stellar Explosions
... A cloud of glowing gas is now visible around SN1987A, and a small central object is becoming discernible: ...
... A cloud of glowing gas is now visible around SN1987A, and a small central object is becoming discernible: ...
Constellations & Stars - Toms River Regional Schools :: Home
... revolving around a center point • Ex. Algol & its companion star in Perseus ...
... revolving around a center point • Ex. Algol & its companion star in Perseus ...
Transcript - Chandra X
... bottom of the scale. The lower left quadrant of the diagram contains hot and dim stars; the upper left quadrant shows hot and bright stars, the upper right quadrant cool and bright, and the lower right quadrant cool and dim. The major branches (locations) of stars are: main sequence, white dwarfs, s ...
... bottom of the scale. The lower left quadrant of the diagram contains hot and dim stars; the upper left quadrant shows hot and bright stars, the upper right quadrant cool and bright, and the lower right quadrant cool and dim. The major branches (locations) of stars are: main sequence, white dwarfs, s ...
X-ray and UV Transients
... >10 events y-1 even if the sensitivity is 102 less. • The observed signals have UV flux~host, so confusion with (even mildly) variable sources is an issue unless additional information is available • A combined UV survey+optical SN survey like PTF will be powerful to get retrospective measurements ...
... >10 events y-1 even if the sensitivity is 102 less. • The observed signals have UV flux~host, so confusion with (even mildly) variable sources is an issue unless additional information is available • A combined UV survey+optical SN survey like PTF will be powerful to get retrospective measurements ...
Sample Exam for Final (with correct answers)
... (e) We know the times of giant explosions in these galaxies, then measure the time the light signals arrive at Earth. 23. The physical significance of the Hubble Constant is that it (a) corresponds to the time since the universe began to expand. ∗ (b) gives the total mass of the universe. (c) repres ...
... (e) We know the times of giant explosions in these galaxies, then measure the time the light signals arrive at Earth. 23. The physical significance of the Hubble Constant is that it (a) corresponds to the time since the universe began to expand. ∗ (b) gives the total mass of the universe. (c) repres ...
The lifes of a star
... permanently. The reason is that Iron is a very stable nucleus so that if two Iron nuclei are slammed together they will only stick if energy is supplied (in contrast, two Hydrogen atoms stick and also release energy). When nuclear reactions stop gravitational contraction continues again and will pro ...
... permanently. The reason is that Iron is a very stable nucleus so that if two Iron nuclei are slammed together they will only stick if energy is supplied (in contrast, two Hydrogen atoms stick and also release energy). When nuclear reactions stop gravitational contraction continues again and will pro ...
Document
... Earth has Newtonian Physics; BHs have Relativistic Physics if you ride into a BH you go in if you watch someone ride in they stay at Rs Proof of Black Hole: ...
... Earth has Newtonian Physics; BHs have Relativistic Physics if you ride into a BH you go in if you watch someone ride in they stay at Rs Proof of Black Hole: ...
Copyright 2004 Society of Photo-Optical Instrumentation Engineers. This
... of high resolution imaging and spectroscopy over the X-ray band of 0.1 keV – 10 keV. The success of CXO is mainly due to the design and manufacture of its X-ray mirrors – the High Resolution Mirror Assembly (HRMA). At 0.84-m long and 0.6 – 1.2-m in diameters, the surface area of each mirror ranging ...
... of high resolution imaging and spectroscopy over the X-ray band of 0.1 keV – 10 keV. The success of CXO is mainly due to the design and manufacture of its X-ray mirrors – the High Resolution Mirror Assembly (HRMA). At 0.84-m long and 0.6 – 1.2-m in diameters, the surface area of each mirror ranging ...
Slide 1
... Denis A. Leahy, Sharon M. Morsink and Yi Chou The accreting millisecond pulsar XTE J1807-294 is studied through a pulse-shape modeling analysis. The model includes blackbody and Comptonized emission from the one visible hot spot and makes use of the Oblate Schwarzschild approximation for ray-tracing ...
... Denis A. Leahy, Sharon M. Morsink and Yi Chou The accreting millisecond pulsar XTE J1807-294 is studied through a pulse-shape modeling analysis. The model includes blackbody and Comptonized emission from the one visible hot spot and makes use of the Oblate Schwarzschild approximation for ray-tracing ...
A historical perspective on the discovery of neutron stars
... Skyrme equation of state for high-density matter. He found that: nuclear forces considerably stiffen the EoS the maximum mass of neutron stars Mmax ≃ 2M⊙ is much higher than that found by Oppenheimer and Volkoff neutron stars can thus be formed as proposed by Baade and Zwicky neutron star cores may ...
... Skyrme equation of state for high-density matter. He found that: nuclear forces considerably stiffen the EoS the maximum mass of neutron stars Mmax ≃ 2M⊙ is much higher than that found by Oppenheimer and Volkoff neutron stars can thus be formed as proposed by Baade and Zwicky neutron star cores may ...
Interstellar Medium (ISM) Interstellar Extinction Star Formation
... Consider the forces acting on a `star forming unit’ within a molecular cloud - a molecular cloud core: ...
... Consider the forces acting on a `star forming unit’ within a molecular cloud - a molecular cloud core: ...
thumbnail images - Kapteyn Astronomical Institute
... the spectral energy distribution to redshifted model spectral energy distributions of different types of astronomical objects, where galactic reddening is taken into account. ...
... the spectral energy distribution to redshifted model spectral energy distributions of different types of astronomical objects, where galactic reddening is taken into account. ...
PHYS3380_111815_bw - The University of Texas at Dallas
... gamma-rays. Magnetars fizzle out in less than 100,000 years, rendering them all but undetectable - astronomers suspect that the Milky Way might be littered with dead magnetars. ...
... gamma-rays. Magnetars fizzle out in less than 100,000 years, rendering them all but undetectable - astronomers suspect that the Milky Way might be littered with dead magnetars. ...
Stars and Galaxies
... When the star’s hydrogen supply is gone, gravity causes the core to contract and heat up. Thermal energy in the star's center causes the star’s outer layers to expand and cool. The star becomes a red giant. Eventually, the interior becomes hot enough to resume nuclear fusion. The outer layers contra ...
... When the star’s hydrogen supply is gone, gravity causes the core to contract and heat up. Thermal energy in the star's center causes the star’s outer layers to expand and cool. The star becomes a red giant. Eventually, the interior becomes hot enough to resume nuclear fusion. The outer layers contra ...
kaekae14 dae dae15 lifecycleofastar
... Brown dwarfs are often thought of as "stillborn" stars. They have masses that range from twice the mass of Jupiter and ...
... Brown dwarfs are often thought of as "stillborn" stars. They have masses that range from twice the mass of Jupiter and ...
Document
... The luminosity distribution is mostly determined by the ISM distribution, then – by the galactic potential. It is important that maxima of the ISM distribution and distribution of compact objects roughly coincide. This results in relatively sharp maximum in the luminosity distribution. ...
... The luminosity distribution is mostly determined by the ISM distribution, then – by the galactic potential. It is important that maxima of the ISM distribution and distribution of compact objects roughly coincide. This results in relatively sharp maximum in the luminosity distribution. ...
Searching for Black Holes. Photometry in our Classrooms.
... star systems was rapidly developed [1],[2],[3],[4]. Especially, X-ray radiation emitting binary systems are of high importance, while in this case one of the components is a compact object probably a black hole or a neutron star, and the other component a „normal‟ star (usually a main sequence star ...
... star systems was rapidly developed [1],[2],[3],[4]. Especially, X-ray radiation emitting binary systems are of high importance, while in this case one of the components is a compact object probably a black hole or a neutron star, and the other component a „normal‟ star (usually a main sequence star ...
DAVID A. RIETHMILLER - Department of Physics and Astronomy
... as a function of time; thus, the resulting light curve gives the asteroidʼs rotation period. Research Experience for Undergraduates – Georgia Institute of Technology (Summer 2005): Refined light curve and radial velocity data from the eclipsing binary star system MM Herculis. Light curve data on thi ...
... as a function of time; thus, the resulting light curve gives the asteroidʼs rotation period. Research Experience for Undergraduates – Georgia Institute of Technology (Summer 2005): Refined light curve and radial velocity data from the eclipsing binary star system MM Herculis. Light curve data on thi ...
Star formation and Evolution
... hydrogen into helium. Because stars shine by those nuclear reactions, they have a finite life span. The theory of stellar evolution describes how stars form and change during that life span. Stars are formed when part of a interstellar gas cloud contracts under its own gravitational force; as it col ...
... hydrogen into helium. Because stars shine by those nuclear reactions, they have a finite life span. The theory of stellar evolution describes how stars form and change during that life span. Stars are formed when part of a interstellar gas cloud contracts under its own gravitational force; as it col ...
Dark Matter
... Mass comes from Newton’s/Kepler’s Law M= A3 /P2 Or can use velocity and radius Galaxy masses range from 50X Milky Way for Giant Ellipticals=1012 To a million solar masses for dwarf ellipticals/irregulars ...
... Mass comes from Newton’s/Kepler’s Law M= A3 /P2 Or can use velocity and radius Galaxy masses range from 50X Milky Way for Giant Ellipticals=1012 To a million solar masses for dwarf ellipticals/irregulars ...
Astrophysical X-ray source
Astrophysical X-ray sources are astronomical objects with physical properties which result in the emission of X-rays.There are a number of types of astrophysical objects which emit X-rays, from galaxy clusters, through black holes in active galactic nuclei (AGN) to galactic objects such as supernova remnants, stars, and binary stars containing a white dwarf (cataclysmic variable stars and super soft X-ray sources), neutron star or black hole (X-ray binaries). Some solar system bodies emit X-rays, the most notable being the Moon, although most of the X-ray brightness of the Moon arises from reflected solar X-rays. A combination of many unresolved X-ray sources is thought to produce the observed X-ray background. The X-ray continuum can arise from bremsstrahlung, either magnetic or ordinary Coulomb, black-body radiation, synchrotron radiation, inverse Compton scattering of lower-energy photons be relativistic electrons, knock-on collisions of fast protons with atomic electrons, and atomic recombination, with or without additional electron transitions.Furthermore, celestial entities in space are discussed as celestial X-ray sources. The origin of all observed astronomical X-ray sources is in, near to, or associated with a coronal cloud or gas at coronal cloud temperatures for however long or brief a period.