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 ...
Supernova! Toledo Astronomical Association, February 2009
... They can briefly outshine their entire galaxy ...
... They can briefly outshine their entire galaxy ...
Dormant black holes turn into ravenous beasts when stars wake
... soon scan the sky for transient and variable phenomena. And astronomers have also detected X-rays and radio waves from brief, spectacular jets that can form when the shredded star funnels into the black hole. These developments are guiding future searches for these rare events. We are able to see bl ...
... soon scan the sky for transient and variable phenomena. And astronomers have also detected X-rays and radio waves from brief, spectacular jets that can form when the shredded star funnels into the black hole. These developments are guiding future searches for these rare events. We are able to see bl ...
ph507lecnote07
... sunspot cycle. At these times, the corona is much less regular and much more extended than at sunspot minimum. Astronomers believe that coronal heating is caused by surface activity on the Sun. The changing shape and size of the corona are the direct result of variations in prominence and flare acti ...
... sunspot cycle. At these times, the corona is much less regular and much more extended than at sunspot minimum. Astronomers believe that coronal heating is caused by surface activity on the Sun. The changing shape and size of the corona are the direct result of variations in prominence and flare acti ...
THE INNER CORE OF A NEUTRON STAR Part 1
... fewer quantum states than electrons, neutron degeneracy pressure is stronger than electron degeneracy pressure. The tremendous nuclear forces between the densely packed neutrons cause quantum waves, forcing the neutrons to flow along lines of minimized repulsive nuclear forces [8]. The tremendous nu ...
... fewer quantum states than electrons, neutron degeneracy pressure is stronger than electron degeneracy pressure. The tremendous nuclear forces between the densely packed neutrons cause quantum waves, forcing the neutrons to flow along lines of minimized repulsive nuclear forces [8]. The tremendous nu ...
Accretion Processes of Binaries of White Dwarfs
... Cataclysmic Variables • Ideal systems for investigation of accretion processes • Quasars are too far away. • Protostars are severely obscured by dust. • Neutron star and black hole systems emit most energy in X-rays. ...
... Cataclysmic Variables • Ideal systems for investigation of accretion processes • Quasars are too far away. • Protostars are severely obscured by dust. • Neutron star and black hole systems emit most energy in X-rays. ...
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... dark matter. Dark matter is hypothetical;; its actual existence is simply scientific and mathematical conjecture (educated guess). Only its gravitational effects on visible objects can be observed (such as the rotational curves of spiral galaxies). Some scientis ...
... dark matter. Dark matter is hypothetical;; its actual existence is simply scientific and mathematical conjecture (educated guess). Only its gravitational effects on visible objects can be observed (such as the rotational curves of spiral galaxies). Some scientis ...
No Slide Title
... • The brightest supernovae reach M = -19 at the peak of their output. In theory they can be seen up to 8000 Mly from Earth. This makes them potentially very interesting as Standard Candles. • Supernovae are divided into various types. Type 1 are thought to be formed by the same kind of event that ca ...
... • The brightest supernovae reach M = -19 at the peak of their output. In theory they can be seen up to 8000 Mly from Earth. This makes them potentially very interesting as Standard Candles. • Supernovae are divided into various types. Type 1 are thought to be formed by the same kind of event that ca ...
The Gaseous Halo of NGC 891 Edmund Hodges-Kluck Joel Bregman
... Wang 2013)? • Are metals in the hot gas depleted onto dust? • Did a small amount of accretion trigger a large amount of star formation (halo may not be in a steady state)? • … are they unrelated? ...
... Wang 2013)? • Are metals in the hot gas depleted onto dust? • Did a small amount of accretion trigger a large amount of star formation (halo may not be in a steady state)? • … are they unrelated? ...
Document
... components orbit each other every 2.9 days A B8 V star of about 3.7 solar masses and a K2 subgiant with 0.8 solar masses – paradox! K2 IV star was originally the primary, but has transferred much of its mass to the former secondary. Mass transfer rate from K2 to B8 about 5 x 10-7 solar masses per ye ...
... components orbit each other every 2.9 days A B8 V star of about 3.7 solar masses and a K2 subgiant with 0.8 solar masses – paradox! K2 IV star was originally the primary, but has transferred much of its mass to the former secondary. Mass transfer rate from K2 to B8 about 5 x 10-7 solar masses per ye ...
Birth, Lives, and Death of Stars
... Gas from supernova explosions also has strong radio emission with a non-thermal 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. ...
... Gas from supernova explosions also has strong radio emission with a non-thermal 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. ...
PPT Slides - Center for Computational Sciences
... • Galaxy lifetimes greater than 109 yr. • Yet star formation continues today. • How are starbursts, low surface brightness galaxies different? ...
... • Galaxy lifetimes greater than 109 yr. • Yet star formation continues today. • How are starbursts, low surface brightness galaxies different? ...
Understanding LMXBs in Elliptical Galaxies
... follow the LMXB formation rate pattern and NOT the star formation of the galaxy ...
... follow the LMXB formation rate pattern and NOT the star formation of the galaxy ...
Lyman-α observations of astrospheres
... These stars are rapid rotators (Prot = 4.69 and 6.2 days, respectively), have large FX ≈ 2 × 106 ergs cm−2 s−1 , but small mass-loss rates similar to the Sun. We note that these mass-loss rates are a factor of 100 times smaller than theoretical estimates for π 1 UMa (Cranmer and Saar, 2011; Drake et ...
... These stars are rapid rotators (Prot = 4.69 and 6.2 days, respectively), have large FX ≈ 2 × 106 ergs cm−2 s−1 , but small mass-loss rates similar to the Sun. We note that these mass-loss rates are a factor of 100 times smaller than theoretical estimates for π 1 UMa (Cranmer and Saar, 2011; Drake et ...
Chapter 22
... The Sun produces energy from hydrogen. Energy flows through the Sun’s layers. Features appear on the Sun’s surface. ...
... The Sun produces energy from hydrogen. Energy flows through the Sun’s layers. Features appear on the Sun’s surface. ...
The star-forming environment of an ultraluminous X-ray
... a small group of OB stars, but is not associated with any massive young clusters nor with any extraordinary massive stars. The brightest point source in the Chandra error circle is consistent with a single blue supergiant (BSG) of mass ≈20 M and age ≈10 Myr. A few other stars are resolved inside th ...
... a small group of OB stars, but is not associated with any massive young clusters nor with any extraordinary massive stars. The brightest point source in the Chandra error circle is consistent with a single blue supergiant (BSG) of mass ≈20 M and age ≈10 Myr. A few other stars are resolved inside th ...
The Milky Way The Milky Way`s Neighbourhood
... The term “quasar” is short for “quasi-stellar radio source.” The term came into general usage in the 1960s, when astronomers studying cosmic radio sources noticed that many of them looked like stars on photographs. Subsequent studies showed that they were not stars at all, but rather active galactic ...
... The term “quasar” is short for “quasi-stellar radio source.” The term came into general usage in the 1960s, when astronomers studying cosmic radio sources noticed that many of them looked like stars on photographs. Subsequent studies showed that they were not stars at all, but rather active galactic ...
Using gamma-rays to probe the clumped structure of stellar winds
... be similar to the primary in Cygnus X-1. The fraction of the accretion power that goes to relativistic The basic model for hadronic gamma-ray produc- protons in the jet is 10−3 . tion in a microquasar with an homogeneous wind From Fig. 2 we see that a gamma-ray flare with has been developed by Romer ...
... be similar to the primary in Cygnus X-1. The fraction of the accretion power that goes to relativistic The basic model for hadronic gamma-ray produc- protons in the jet is 10−3 . tion in a microquasar with an homogeneous wind From Fig. 2 we see that a gamma-ray flare with has been developed by Romer ...
protostars and pre-main
... using guessed central values for P, T, iterate until match with outer boundary conditions. ...
... using guessed central values for P, T, iterate until match with outer boundary conditions. ...
What constitutes the dark matter?
... fall time 1/ density, diameter sound speed fall time, mass 100.000 suns • Gibson 1996: Viscosity leads to fragmentation in gas balls of a few earth masses • If gas balls coagulate, stars form • Then Jeans cluster becomes visible as globular cluster • Most gas balls cool and freeze, their ...
... fall time 1/ density, diameter sound speed fall time, mass 100.000 suns • Gibson 1996: Viscosity leads to fragmentation in gas balls of a few earth masses • If gas balls coagulate, stars form • Then Jeans cluster becomes visible as globular cluster • Most gas balls cool and freeze, their ...
letters - MIT Kavli Institute for Astrophysics and Space Research
... through to the chromosphere, which is probably more representative of the underlying photospheric material than coronal regions. Recent sophisticated models of heliospheric pickup ion and anomalous cosmic ray populations from the local interstellar medium are also inconsistent with the current solar ...
... through to the chromosphere, which is probably more representative of the underlying photospheric material than coronal regions. Recent sophisticated models of heliospheric pickup ion and anomalous cosmic ray populations from the local interstellar medium are also inconsistent with the current solar ...
PH109 Exploring the Universe, Test#4, Spring 2005 Please indicate
... 14. Why is the energy source of active galaxies thought to be extremely compact? a) Their energy is totally no stellar in origin. b) Their spectra are like those produced by ordinary stars. c) They vary on rapid time scales. d) They can be seen clearly; we can see that the energy source is compact. ...
... 14. Why is the energy source of active galaxies thought to be extremely compact? a) Their energy is totally no stellar in origin. b) Their spectra are like those produced by ordinary stars. c) They vary on rapid time scales. d) They can be seen clearly; we can see that the energy source is compact. ...
The Milky Way powepoint
... the quasars, we are really looking back into time. Why are all galaxies moving away from us? Why should the galaxies farthest away from us move away the fastest? What’s so special about us? ...
... the quasars, we are really looking back into time. Why are all galaxies moving away from us? Why should the galaxies farthest away from us move away the fastest? What’s so special about us? ...
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... But we also know that most of it is composed of some as yet unknown type of particles, or represents some new physics The proposed possible constituents range from unknown ultra-light particles, to massive black holes and cosmic strings, but the favorite DM particles are WIMPs, or axions These parti ...
... But we also know that most of it is composed of some as yet unknown type of particles, or represents some new physics The proposed possible constituents range from unknown ultra-light particles, to massive black holes and cosmic strings, but the favorite DM particles are WIMPs, or axions These parti ...
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.