Bright Quasar 3C 273 Encyclopedia of Astronomy & Astrophysics eaa.iop.org Thierry J-L Courvoisier
... 3C 273 is clearly a very luminous object indeed. Its light output corresponds to 1014 times that of the Sun. Most quasars do not radiate substantially in the radio part of the electromagnetic spectrum, and are called radio quiet quasars. A small fraction, of which 3C 273 is a member, do, however. Th ...
... 3C 273 is clearly a very luminous object indeed. Its light output corresponds to 1014 times that of the Sun. Most quasars do not radiate substantially in the radio part of the electromagnetic spectrum, and are called radio quiet quasars. A small fraction, of which 3C 273 is a member, do, however. Th ...
Accretion
... because gas has to lose enormous amount of gravitational potential energy to fall onto them (E ~ GM2/r, r ~ 0 for a black hole!) Accretion onto compact objects is most powerful energy source in the Universe, more powerful than nuclear reactions! Emission typically in X-rays band It produces active g ...
... because gas has to lose enormous amount of gravitational potential energy to fall onto them (E ~ GM2/r, r ~ 0 for a black hole!) Accretion onto compact objects is most powerful energy source in the Universe, more powerful than nuclear reactions! Emission typically in X-rays band It produces active g ...
The Milky Way Galaxy - Academic Computer Center
... Jupiter’s orbit but with a This is called a supermassive mass several million times black hole. Most other galaxies the mass of the Sun. are also thought to have these huge • Since so little light is visible black holes in their centers. from this object it is thought to be a very large black hole. ...
... Jupiter’s orbit but with a This is called a supermassive mass several million times black hole. Most other galaxies the mass of the Sun. are also thought to have these huge • Since so little light is visible black holes in their centers. from this object it is thought to be a very large black hole. ...
Binary Stars/Star Clusters
... The faster the source, the more compression/stretching Sound: frequency (pitch) of a siren gets higher as ambulance moves toward an observer (vice versa) MPP©2004 ...
... The faster the source, the more compression/stretching Sound: frequency (pitch) of a siren gets higher as ambulance moves toward an observer (vice versa) MPP©2004 ...
wk11noQ
... regions” marking areas of intense star formation activity. HII regions tend to lie along spiral arms. • Radiation from hot, young stars causes the gas to be ionized. The cascade of electrons down atomic energy levels results in an emission line spectrum. Examples of emission lines in the ultraviolet ...
... regions” marking areas of intense star formation activity. HII regions tend to lie along spiral arms. • Radiation from hot, young stars causes the gas to be ionized. The cascade of electrons down atomic energy levels results in an emission line spectrum. Examples of emission lines in the ultraviolet ...
this PDF file - University of Leicester
... to change its body temperature of the order of 107 K in order to accomplish the ability to switch between all 3 of these scenarios. Therefore it is deemed impossible to exist in nature, or at the least very highly unlikely. ...
... to change its body temperature of the order of 107 K in order to accomplish the ability to switch between all 3 of these scenarios. Therefore it is deemed impossible to exist in nature, or at the least very highly unlikely. ...
Observational Astronomy - Lecture 10 Galaxies
... They come in a wide variety of shapes, but there are two main types: Spiral galaxies, which are blue in color because they are still forming stars. Elliptical galaxies, which are no longer forming many stars and are therefore red in color. The star formation rate of the universe peaked long ago and ...
... They come in a wide variety of shapes, but there are two main types: Spiral galaxies, which are blue in color because they are still forming stars. Elliptical galaxies, which are no longer forming many stars and are therefore red in color. The star formation rate of the universe peaked long ago and ...
Atypical thermonuclear supernovae from tidally crushed white dwarfs
... the dynamics of stars in the inner regions of nearby clusters such as M15 and G1 suggest the presence of black holes with masses of the order of 103 and 104 M , respectively (Gerssen et al. 2002, 2003; Gebhardt et al. 2002, 2005). This evidence remains rather controversial, partly because the veloc ...
... the dynamics of stars in the inner regions of nearby clusters such as M15 and G1 suggest the presence of black holes with masses of the order of 103 and 104 M , respectively (Gerssen et al. 2002, 2003; Gebhardt et al. 2002, 2005). This evidence remains rather controversial, partly because the veloc ...
Summary of recent research activities
... be ‘primordial’ galaxies, in the sense of having started forming stars only a few hundred Myr ago. In this respect, I Zw 18 is still considered the best candidate, since it has the lowest oxygen abundance among galaxies in the local Universe (∼ 1/50 solar; Searle & Sargent 1972, ApJ 173, 25); howeve ...
... be ‘primordial’ galaxies, in the sense of having started forming stars only a few hundred Myr ago. In this respect, I Zw 18 is still considered the best candidate, since it has the lowest oxygen abundance among galaxies in the local Universe (∼ 1/50 solar; Searle & Sargent 1972, ApJ 173, 25); howeve ...
ly Searching the Sky: The Swift Mission and High Energy Physics Connections
... UHECRs are known to be extragalactic, but intervening magnetic fields make it difficult to discover exactly where they come from. ...
... UHECRs are known to be extragalactic, but intervening magnetic fields make it difficult to discover exactly where they come from. ...
ausac_cjs_2008_1
... of host galaxy Distribution of MHI/LB for the host galaxies and a large sample of inactive galaxies. Similar distribution for later types, but early type active galaxies appear more gas-rich. ...
... of host galaxy Distribution of MHI/LB for the host galaxies and a large sample of inactive galaxies. Similar distribution for later types, but early type active galaxies appear more gas-rich. ...
Chapter 1 Introduction
... stellar winds or by interactions with the close binary companion. e loss of the hydrogen envelope from the primary means that these stripped core-collapse supernovae tend to show little or no hydrogen, and are therefore classed as Type Ib (containing helium lines) or Type Ic (containing no helium li ...
... stellar winds or by interactions with the close binary companion. e loss of the hydrogen envelope from the primary means that these stripped core-collapse supernovae tend to show little or no hydrogen, and are therefore classed as Type Ib (containing helium lines) or Type Ic (containing no helium li ...
Biography of a Star - Max-Planck
... does not vanish as a small black hole; instead, it becomes progressively colder and darker. But back to stars of normal weight. A few million years after birth, the young star checks the deluge of matter from its parent cloud by means of increasingly intense radiation and a rising wind of charged pa ...
... does not vanish as a small black hole; instead, it becomes progressively colder and darker. But back to stars of normal weight. A few million years after birth, the young star checks the deluge of matter from its parent cloud by means of increasingly intense radiation and a rising wind of charged pa ...
STAAR Science Tutorial 34 TEK 8.8A: Stars, Galaxies
... spiral galaxy is spherical. Younger stars are more likely found in the arms of the spiral, and older stars are most likely found in the center sphere. Scientists believe that the center of all spiral galaxies contains a massive black hole, an extremely dense area from which light cannot escape. Our ...
... spiral galaxy is spherical. Younger stars are more likely found in the arms of the spiral, and older stars are most likely found in the center sphere. Scientists believe that the center of all spiral galaxies contains a massive black hole, an extremely dense area from which light cannot escape. Our ...
STAAR Science Tutorial 28 TEK 8.8A: Stars
... spiral galaxy is spherical. Younger stars are more likely found in the arms of the spiral, and older stars are most likely found in the center sphere. Scientists believe that the center of all spiral galaxies contains a massive black hole, an extremely dense area from which light cannot escape. Our ...
... spiral galaxy is spherical. Younger stars are more likely found in the arms of the spiral, and older stars are most likely found in the center sphere. Scientists believe that the center of all spiral galaxies contains a massive black hole, an extremely dense area from which light cannot escape. Our ...
Producing ultra-strong magnetic fields in neutron star mergers
... (2). Moreover, the long-suspected connection of neutron star binaries to Gamma-Ray Bursts (GRBs), the most luminous explosions in the universe, has received solid support from the first detections of afterglows from the short class of GRBs (3–5): unlike their long-duration cousins ...
... (2). Moreover, the long-suspected connection of neutron star binaries to Gamma-Ray Bursts (GRBs), the most luminous explosions in the universe, has received solid support from the first detections of afterglows from the short class of GRBs (3–5): unlike their long-duration cousins ...
Titelseite
... Instable elements with a long lifetime give information about the element‘s average production in certain parts of the galaxy. One example of such an element is 26Al (with a half life of τ= 1.04 106 years). Instable elements with a short lifetime (shorter than the average production rate) can help u ...
... Instable elements with a long lifetime give information about the element‘s average production in certain parts of the galaxy. One example of such an element is 26Al (with a half life of τ= 1.04 106 years). Instable elements with a short lifetime (shorter than the average production rate) can help u ...
X-ray polarimetry in astrophysics
... • Toroidal magnetic field : The whole radiation does not produce a net polarization but due to light aberration the observer probes a small region with the magnetic field ordered in a specific direction. Therefore the polarization is high. • Random magnetic field : The polarization can still be high ...
... • Toroidal magnetic field : The whole radiation does not produce a net polarization but due to light aberration the observer probes a small region with the magnetic field ordered in a specific direction. Therefore the polarization is high. • Random magnetic field : The polarization can still be high ...
File
... The blue white hot core is left behind causing a white dwarf. When there is no more energy it becomes a ___________ dwarf. Pulsars- Neutron Stars A dying giant or supergiant star can suddenly explode. Within hours, the star blazes millions of times brighter. The explosion is called a ___________ ...
... The blue white hot core is left behind causing a white dwarf. When there is no more energy it becomes a ___________ dwarf. Pulsars- Neutron Stars A dying giant or supergiant star can suddenly explode. Within hours, the star blazes millions of times brighter. The explosion is called a ___________ ...
Details of the measurement technique
... water maser therefore can shine a beamed ray of radio waves at a very specific frequency, 22,235 MHz, which corresponds to radio waves about 1 cm in wavelength. When water masers are detected in the accretion disks of external galaxies they are called megamasers. These megamasers are valuable tools, ...
... water maser therefore can shine a beamed ray of radio waves at a very specific frequency, 22,235 MHz, which corresponds to radio waves about 1 cm in wavelength. When water masers are detected in the accretion disks of external galaxies they are called megamasers. These megamasers are valuable tools, ...
Neutron Density and Neutron Source Determination in Barium
... and decided to find out what this was about. First I asked some of my colleagues about Fontenelle, but none of them seemed to know him. "At which observatory does he work?" was one of the kind, but not very helpful replies. Calling the Bavarian State Library in Munich, Ilearned that no less than thr ...
... and decided to find out what this was about. First I asked some of my colleagues about Fontenelle, but none of them seemed to know him. "At which observatory does he work?" was one of the kind, but not very helpful replies. Calling the Bavarian State Library in Munich, Ilearned that no less than thr ...
From eclipse drawings to the coronagraph and spectroscopy
... ¾ the corona is magnetically structured ¾ the appearance of the corona changes with solar activity cycle ¾ 106 K is "quite natural": heat conduction acts as thermostat ¾ a static hot corona cannot exist expansion ¾ appearance the solar atmosphere changes dramatically with temperature ...
... ¾ the corona is magnetically structured ¾ the appearance of the corona changes with solar activity cycle ¾ 106 K is "quite natural": heat conduction acts as thermostat ¾ a static hot corona cannot exist expansion ¾ appearance the solar atmosphere changes dramatically with temperature ...
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.