galaxy phenomenology
... Projection of tighter ‘fundamental plane’ for ellipticals in effective radiusvelocity dispersion-surface brightness space (see BT2, p. 23) ...
... Projection of tighter ‘fundamental plane’ for ellipticals in effective radiusvelocity dispersion-surface brightness space (see BT2, p. 23) ...
poster
... objects (YSOs) in this region, which lacks high UV flux, and compare evolutionary trends with other young star forming clusters. We present results of our multiwavelength study of IRAS 20050+2720 which includes observations by Chandra, Spitzer, and 2MASS and UBVRI photometry. In total, about 300 YSO ...
... objects (YSOs) in this region, which lacks high UV flux, and compare evolutionary trends with other young star forming clusters. We present results of our multiwavelength study of IRAS 20050+2720 which includes observations by Chandra, Spitzer, and 2MASS and UBVRI photometry. In total, about 300 YSO ...
Studying the Metallicities of Dwarf Galaxies Myles McKay (SCSU)
... NO DEFINITION! Milky Way Galaxy ...
... NO DEFINITION! Milky Way Galaxy ...
poster
... Most models of jet launching rely on a magnetic field in either the central source, the accretion disk or both. However, the well-studied nearby young Herbig Ae star HD 163296 has a measured weak stellar magnetic field (main-sequence A stars do not have magnetic fields at all), and even indications ...
... Most models of jet launching rely on a magnetic field in either the central source, the accretion disk or both. However, the well-studied nearby young Herbig Ae star HD 163296 has a measured weak stellar magnetic field (main-sequence A stars do not have magnetic fields at all), and even indications ...
When will a neutron star collapse to a black hole?
... billions of times that of the densest element on Earth. An important property of neutron stars, distinguishing them from normal stars, is that their mass cannot grow without bound. Indeed, if a nonrotating star increases its mass, also its density will increase. Normally this will lead to a new equi ...
... billions of times that of the densest element on Earth. An important property of neutron stars, distinguishing them from normal stars, is that their mass cannot grow without bound. Indeed, if a nonrotating star increases its mass, also its density will increase. Normally this will lead to a new equi ...
Frontiers: Intermediate-Mass Black Holes For our final lecture we will
... definitive characteristic consistent with these explanations (at least at the simplest level), whereas there are of order 10 which have been observed enough that they show complete consistency with an IMBH explanation. This is why I favor IMBHs, but without dynamical mass measurements we will always ...
... definitive characteristic consistent with these explanations (at least at the simplest level), whereas there are of order 10 which have been observed enough that they show complete consistency with an IMBH explanation. This is why I favor IMBHs, but without dynamical mass measurements we will always ...
UvA-DARE (Digital Academic Repository)
... Eventuallyy the polar cap voltage falls below a certain value, the pulsar switches off: it 'dies'. A nn often used diagnostic tool in pulsar physics is the l o g o versus l o g P diagram. As a demonstration,, in figure 1.1 we plotted the derived magnetic field strength versus spin periods forr a lar ...
... Eventuallyy the polar cap voltage falls below a certain value, the pulsar switches off: it 'dies'. A nn often used diagnostic tool in pulsar physics is the l o g o versus l o g P diagram. As a demonstration,, in figure 1.1 we plotted the derived magnetic field strength versus spin periods forr a lar ...
Lecture 6
... presence only through its gravitational influence on the orbits of stars and gas clouds. Conclusion: Galaxies are surrounded by massive halos of invisible matter. This is the main evidence for so-called “dark matter.” Looking at a galaxy is like looking at an iceberg…the stars that you see are only ...
... presence only through its gravitational influence on the orbits of stars and gas clouds. Conclusion: Galaxies are surrounded by massive halos of invisible matter. This is the main evidence for so-called “dark matter.” Looking at a galaxy is like looking at an iceberg…the stars that you see are only ...
Chapter 18 The Bizarre Stellar Graveyard What is a white dwarf
... • Quantum mechanics says that electrons must move faster as they are squeezed into a very small space • As a white dwarf’s mass approaches 1.4MSun, its electrons must move at nearly the speed of light • Because nothing can move faster than light, a white dwarf cannot be more massive than 1.4MSun, th ...
... • Quantum mechanics says that electrons must move faster as they are squeezed into a very small space • As a white dwarf’s mass approaches 1.4MSun, its electrons must move at nearly the speed of light • Because nothing can move faster than light, a white dwarf cannot be more massive than 1.4MSun, th ...
l~ JHd 111
... aeeretion dise of hot gas whieh surrounds the white dwarf. This dise and espeeially its "hot spot"-Le. the plaee where the gas stream from the red eomponent falls onto the dise-are the most prominent light sources of the entire system. This model resembles that of the X-ray binaries, but the masses ...
... aeeretion dise of hot gas whieh surrounds the white dwarf. This dise and espeeially its "hot spot"-Le. the plaee where the gas stream from the red eomponent falls onto the dise-are the most prominent light sources of the entire system. This model resembles that of the X-ray binaries, but the masses ...
document
... Planetary nebula, NGC 2392 (The Eskimo Nebula) The word “nebula” refers to any cloud of interstellar gas and dust. Through small telescopes, these objects looked like the planets Uranus and Neptune, and so early astronomers called them “planetary” nebulae. Astronomers now know that they have nothin ...
... Planetary nebula, NGC 2392 (The Eskimo Nebula) The word “nebula” refers to any cloud of interstellar gas and dust. Through small telescopes, these objects looked like the planets Uranus and Neptune, and so early astronomers called them “planetary” nebulae. Astronomers now know that they have nothin ...
chapter18StarDeath
... • What can happen to a neutron star in a close binary system? – The accretion disk around a neutron star gets hot enough to produce X-rays, making the system an X-ray binary – Sudden fusion events periodically occur on a the surface of an accreting neutron star, producing X-ray bursts ...
... • What can happen to a neutron star in a close binary system? – The accretion disk around a neutron star gets hot enough to produce X-rays, making the system an X-ray binary – Sudden fusion events periodically occur on a the surface of an accreting neutron star, producing X-ray bursts ...
AST1001.ch13
... velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild ...
... velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild ...
the effect of an soft X-ray source near the compact object in LS 5039
... Target photons are changed to 100eV photons, so photon density increases → IC cooling time becomes short → the number of e± decreases U100eV U Ostar ~ L100eV LOstar ( ROstar R100eV ) 2 ~ 103 No variation in GeV & X-ray band In Y&T 2010, e± scattered off stellar photons → each flux modulates by t ...
... Target photons are changed to 100eV photons, so photon density increases → IC cooling time becomes short → the number of e± decreases U100eV U Ostar ~ L100eV LOstar ( ROstar R100eV ) 2 ~ 103 No variation in GeV & X-ray band In Y&T 2010, e± scattered off stellar photons → each flux modulates by t ...
AST1001.ch13
... velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild ...
... velocity equals the speed of light. • This spherical surface is known as the event horizon. • The radius of the event horizon is known as the Schwarzschild ...
A not so massive cluster hosting a very massive star
... age=1 − 5 Myr), and total stellar mass (by integration of Kroupa-IMF, Kroupa 2001, fitted to the cluster mass function; MCL = (3.1 ± 0.6) · 103 M ). The near-IR spectra also revealed part of the cluster main sequence population. We observe 8 stars, and we classify 6 of them as OB-type stars (betwee ...
... age=1 − 5 Myr), and total stellar mass (by integration of Kroupa-IMF, Kroupa 2001, fitted to the cluster mass function; MCL = (3.1 ± 0.6) · 103 M ). The near-IR spectra also revealed part of the cluster main sequence population. We observe 8 stars, and we classify 6 of them as OB-type stars (betwee ...
DISCOVERY OF HOT SUPERGIANT STARS NEAR THE GALACTIC
... Li 2006). Therefore, a comparison of numbers with the recent star formation history of the Galactic center will allow a constraint on models of HMXB formation, evolution, and X-ray production. Recently, Muno et al. (2006a) produced a new catalog of Galactic center X-ray sources. In addition to the e ...
... Li 2006). Therefore, a comparison of numbers with the recent star formation history of the Galactic center will allow a constraint on models of HMXB formation, evolution, and X-ray production. Recently, Muno et al. (2006a) produced a new catalog of Galactic center X-ray sources. In addition to the e ...
14.5 Galactic Spiral Arms
... 14.6 The Mass of the Milky Way Galaxy Once all the galaxy is within an orbit, the velocity should diminish with distance, as the dashed curve shows. It doesn’t; more than twice the mass of the galaxy would have to be outside the visible part to reproduce the ...
... 14.6 The Mass of the Milky Way Galaxy Once all the galaxy is within an orbit, the velocity should diminish with distance, as the dashed curve shows. It doesn’t; more than twice the mass of the galaxy would have to be outside the visible part to reproduce the ...
Determining the Effect of Diffuse X-ray Emission on Point Source Detection
... filamentary structure. Therefore, the next step was to subtract these source regions from the data. The raw data is stored in an events file, which is a list of every X-ray that hit the Chandra CCDs, along with information about each X-ray’s energy, location, and other qualities. Using this file, we ca ...
... filamentary structure. Therefore, the next step was to subtract these source regions from the data. The raw data is stored in an events file, which is a list of every X-ray that hit the Chandra CCDs, along with information about each X-ray’s energy, location, and other qualities. Using this file, we ca ...
ppt
... APEX S-Z observations of the XMM-LSS field Marguerite PIERRE (CEA Saclay) Rüdiger KNEISSL (Berkeley) ...
... APEX S-Z observations of the XMM-LSS field Marguerite PIERRE (CEA Saclay) Rüdiger KNEISSL (Berkeley) ...
The Life Cycles of Stars, Part II
... Once medium and high mass stars reach the red giant phase, the core temperature increases as carbon atoms are formed from the fusion of helium atoms. Gravity continues to pull carbon atoms together as the temperature increases forming oxygen, nitrogen, and eventually iron. At this point, fusion stop ...
... Once medium and high mass stars reach the red giant phase, the core temperature increases as carbon atoms are formed from the fusion of helium atoms. Gravity continues to pull carbon atoms together as the temperature increases forming oxygen, nitrogen, and eventually iron. At this point, fusion stop ...
The Life Cycles of Stars
... Once medium and high mass stars reach the red giant phase, the core temperature increases as carbon atoms are formed from the fusion of helium atoms. Gravity continues to pull carbon atoms together as the temperature increases forming oxygen, nitrogen, and eventually iron. At this point, fusion stop ...
... Once medium and high mass stars reach the red giant phase, the core temperature increases as carbon atoms are formed from the fusion of helium atoms. Gravity continues to pull carbon atoms together as the temperature increases forming oxygen, nitrogen, and eventually iron. At this point, fusion stop ...
Diapositiva 1
... Herbig-Haro Object have been determine from three spectrograms taken by Herbig in January, 1955. Therefore, the most obvious means of explaining the ionization is to assume a strong radiation field in the far ultraviolet. If the radiation is produced by a "central star" (of solar dimension) in the n ...
... Herbig-Haro Object have been determine from three spectrograms taken by Herbig in January, 1955. Therefore, the most obvious means of explaining the ionization is to assume a strong radiation field in the far ultraviolet. If the radiation is produced by a "central star" (of solar dimension) in the n ...
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.