Lecture 2. Thermal evolution and surface emission of
... Cooling of X-ray transients “Many neutron stars in close X-ray binaries are transient accretors (transients); They exhibit X-ray bursts separated by long periods (months or even years) of quiescence. It is believed that the quiescence corresponds to a lowlevel, or even halted, accretion onto the ne ...
... Cooling of X-ray transients “Many neutron stars in close X-ray binaries are transient accretors (transients); They exhibit X-ray bursts separated by long periods (months or even years) of quiescence. It is believed that the quiescence corresponds to a lowlevel, or even halted, accretion onto the ne ...
ppt - CIERA - Northwestern
... Densest stellar cluster--an extreme of star formation. SSCs cluster to make “starburst clumps” where SSC-SSC interactions are possible and which drive galactic winds. SSCs contain a full range of intermediate-high mass stars. Central stellar densities can exceed 105 stars/pc3. Mass segregation may h ...
... Densest stellar cluster--an extreme of star formation. SSCs cluster to make “starburst clumps” where SSC-SSC interactions are possible and which drive galactic winds. SSCs contain a full range of intermediate-high mass stars. Central stellar densities can exceed 105 stars/pc3. Mass segregation may h ...
Life Cycle of stars
... dwarf stars usually have temperatures near absolute zero, and have diameters similar to that of terrestrial planets such as Earth and Venus. In this stage, the black dwarf star will remain forever emitting no light. That is the end of the low mass medium sized stars. When stars formed with a large m ...
... dwarf stars usually have temperatures near absolute zero, and have diameters similar to that of terrestrial planets such as Earth and Venus. In this stage, the black dwarf star will remain forever emitting no light. That is the end of the low mass medium sized stars. When stars formed with a large m ...
Searching for Dwarf Galaxies and Population III Star
... sources is the chemically unevolved surroundings of a large galaxy or proto-cluster of galaxies at high redshift. The central sources are likely to have ionized a local “bubble” through which strong Lyman emission can escape from surrounding dwarf galaxies. Thus, near-infrared observations of thes ...
... sources is the chemically unevolved surroundings of a large galaxy or proto-cluster of galaxies at high redshift. The central sources are likely to have ionized a local “bubble” through which strong Lyman emission can escape from surrounding dwarf galaxies. Thus, near-infrared observations of thes ...
The Milky Way - National Tsing Hua University
... making new stars as the eons pass, but the nuclei of some galaxies are sites of powerful eruptions that eject highspeed jets in opposite directions. As you study these active galaxies, you will be combining many of the ideas you have discovered so far to answer five essential questions: • What evide ...
... making new stars as the eons pass, but the nuclei of some galaxies are sites of powerful eruptions that eject highspeed jets in opposite directions. As you study these active galaxies, you will be combining many of the ideas you have discovered so far to answer five essential questions: • What evide ...
the obscuration in liners - Instituto de Astronomía
... allowed us to perform a careful study of the Xray nuclear properties of these galaxies (GonzálezMartı́n et al. 2006, 2009a,b). Our analysis demonstrates that 60% of a sample of 82 LINERs shows compact unresolved nuclear sources at high energies (4.5–8 keV) and median values X-ray luminosity of 3.2 ...
... allowed us to perform a careful study of the Xray nuclear properties of these galaxies (GonzálezMartı́n et al. 2006, 2009a,b). Our analysis demonstrates that 60% of a sample of 82 LINERs shows compact unresolved nuclear sources at high energies (4.5–8 keV) and median values X-ray luminosity of 3.2 ...
Gamma Ray Bursts - University of Arizona
... Model • GRB occurs after supernova explosion • Iron produced in supernova can then be lit up by gammaray burst – producing iron lines! • Iron lines observed! ...
... Model • GRB occurs after supernova explosion • Iron produced in supernova can then be lit up by gammaray burst – producing iron lines! • Iron lines observed! ...
Neutron stars and pulsars
... If a spinning neutron star has a dipole magnetic field and the dipole axis and spin axis are not aligned to each other, it will emit electromagnetic radiation. As rotational energy is extracted, we can obtain an estimate of the neutron-star magnetic field from the measurement of the rate of change i ...
... If a spinning neutron star has a dipole magnetic field and the dipole axis and spin axis are not aligned to each other, it will emit electromagnetic radiation. As rotational energy is extracted, we can obtain an estimate of the neutron-star magnetic field from the measurement of the rate of change i ...
Informational Brochure "Enlightening Science"
... new opportunities for science. Research groups from around the world will investigate nanometre-scale structures, fast processes, and extreme states; take three-dimensional (3D) images of viruses and proteins; and film chemical reactions. The construction and operation of the facility is entrusted t ...
... new opportunities for science. Research groups from around the world will investigate nanometre-scale structures, fast processes, and extreme states; take three-dimensional (3D) images of viruses and proteins; and film chemical reactions. The construction and operation of the facility is entrusted t ...
Instruments and Methods of Astrophysical X-ray
... X-ray Polarimetry Polarimetry would add to energy and time two further observable quantities (the amount and the angle of polarization) constraining any model and interpretation: a theoretical/observational break-through (Mészáros, P. et al. ...
... X-ray Polarimetry Polarimetry would add to energy and time two further observable quantities (the amount and the angle of polarization) constraining any model and interpretation: a theoretical/observational break-through (Mészáros, P. et al. ...
IL CIELO COME LABORATORIO – 2010/2011 STAR FORMATION
... two acquired spectra from the telescope. Another purpose was to calculate how many ionizing photons are emitted every second, and the theoretical number of stars necessary to heat the ionized gas if all the stars belong to spectral class O5 or B1. The Star Formation Rate of the galaxy results 7 sola ...
... two acquired spectra from the telescope. Another purpose was to calculate how many ionizing photons are emitted every second, and the theoretical number of stars necessary to heat the ionized gas if all the stars belong to spectral class O5 or B1. The Star Formation Rate of the galaxy results 7 sola ...
Radio galaxies: main classes Large radio galaxies with lobes are
... a) Lyman alpha forest in optical spectra (absorbing gas in walls? IGM information) b) Gravitationally lensed by clusters, can get Hubble constant from time delay ...
... a) Lyman alpha forest in optical spectra (absorbing gas in walls? IGM information) b) Gravitationally lensed by clusters, can get Hubble constant from time delay ...
Death - Wayne State University Physics and Astronomy
... • Gas from supernova explosions also has strong radio emission with a nonthermal continuous spectrum that is produced by electrons spiraling around magnetic field lines • Gas from recent explosions (within a few thousand years ago) are visible with X-ray telescopes as well 12 April 2005 ...
... • Gas from supernova explosions also has strong radio emission with a nonthermal continuous spectrum that is produced by electrons spiraling around magnetic field lines • Gas from recent explosions (within a few thousand years ago) are visible with X-ray telescopes as well 12 April 2005 ...
Galaxies Slide Show and Videos
... is good because we want to stay far away from the supermassive black hole at the ...
... is good because we want to stay far away from the supermassive black hole at the ...
Educator`s Guide - Ott Planetarium
... energy ultraviolet radiation. The atmosphere also blocks much of the infrared spectrum. That’s great for living things, but it also means there’s a lot to “see” beyond what our atmosphere allows. If we want to observe in these wavelengths, we need to position our instruments above the atmosphere. Th ...
... energy ultraviolet radiation. The atmosphere also blocks much of the infrared spectrum. That’s great for living things, but it also means there’s a lot to “see” beyond what our atmosphere allows. If we want to observe in these wavelengths, we need to position our instruments above the atmosphere. Th ...
Chapter 2 Observing the Electromagnetic Spectrum
... The High Energy Astrophysical Observatory-2 (HEAO-2), later named Einstein, was launched into low Earth orbit on November 13th, 1978 and operated until April, 1981. It was the first X-ray mission to use focusing optics with imaging detectors and produce angular resolution of a few arc seconds3 ( ′′ ...
... The High Energy Astrophysical Observatory-2 (HEAO-2), later named Einstein, was launched into low Earth orbit on November 13th, 1978 and operated until April, 1981. It was the first X-ray mission to use focusing optics with imaging detectors and produce angular resolution of a few arc seconds3 ( ′′ ...
The larger the magnetic field, the stronger our ignorance
... The post-war heroes, struggling with high noise and low angular resolution, succeeded in demonstrating the existence of compact sources, including the already notable Crab Nebula (remnant of a supernova seen in 1054), but also others that didn’t seem to be any particular interesting place at all, li ...
... The post-war heroes, struggling with high noise and low angular resolution, succeeded in demonstrating the existence of compact sources, including the already notable Crab Nebula (remnant of a supernova seen in 1054), but also others that didn’t seem to be any particular interesting place at all, li ...
poster
... three and seven days, but even for those sources, significant variability in addition to the periodic signal can be seen. No period is stable over 1.6 years. Non-periodic lightcurves often still show a preferred timescale of variability which is longer for more embedded sources. About half of all so ...
... three and seven days, but even for those sources, significant variability in addition to the periodic signal can be seen. No period is stable over 1.6 years. Non-periodic lightcurves often still show a preferred timescale of variability which is longer for more embedded sources. About half of all so ...
Spots on Ap Stars
... • The mechanism for M dwarf flares is different than in the Sun • Blue and UV continuum increase by several magnitudes in seconds (unlike the Sun, where the contrast to the ...
... • The mechanism for M dwarf flares is different than in the Sun • Blue and UV continuum increase by several magnitudes in seconds (unlike the Sun, where the contrast to the ...
GALAXIES Reading Comprehension
... has a diameter of up to 120,000 light years. Our solar system orbits around the Milky Way once every 200-250 million years. You can see the Milky Way galaxy on a clear night. It looks like a milky white band across the night sky. The center of the g ...
... has a diameter of up to 120,000 light years. Our solar system orbits around the Milky Way once every 200-250 million years. You can see the Milky Way galaxy on a clear night. It looks like a milky white band across the night sky. The center of the g ...
Dark Matter: What is it?
... 1) Some dark matter consists of MACHOs (MAssive Compact Halo Objects). 2) Some dark matter may consist of WIMPs (Weakly Interacting Massive Particles). ...
... 1) Some dark matter consists of MACHOs (MAssive Compact Halo Objects). 2) Some dark matter may consist of WIMPs (Weakly Interacting Massive Particles). ...
The Universe - Cloudfront.net
... a. a dark, cool interstellar cloud begins to contract b. a protostar reaches a temperature high enough for nuclear fusion to begin c. pressure within a protostar becomes so great that a supernova occurs d. a red giant collapses on itself and becomes a black hole 3) Which force is most responsible fo ...
... a. a dark, cool interstellar cloud begins to contract b. a protostar reaches a temperature high enough for nuclear fusion to begin c. pressure within a protostar becomes so great that a supernova occurs d. a red giant collapses on itself and becomes a black hole 3) Which force is most responsible fo ...
Introduction to Galaxies 5/23/2013 BR: Milky Way Scale The Milky
... centered on a specific point and appear to orbit the center of the Milky Way. The center of the Milky Way is a region of very high star density, most of which is obscured by interstellar gas and dust. Motion of stars that orbit close to the galactic center indicate that this area has about 2.6 milli ...
... centered on a specific point and appear to orbit the center of the Milky Way. The center of the Milky Way is a region of very high star density, most of which is obscured by interstellar gas and dust. Motion of stars that orbit close to the galactic center indicate that this area has about 2.6 milli ...
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.