X-ray emission from young pulsar, PWN and SNRs
... • The morphology of a PWN is determined by the interaction with the environment. If the pulsar – is in a low density cavity, then the structure of the PWN reflects mainly the pulsar wind geometry. – is surrounded by the SNR ejecta, the wind materials will be well confined, and the expansion of the P ...
... • The morphology of a PWN is determined by the interaction with the environment. If the pulsar – is in a low density cavity, then the structure of the PWN reflects mainly the pulsar wind geometry. – is surrounded by the SNR ejecta, the wind materials will be well confined, and the expansion of the P ...
supernova remnants: a link between massive stars and the
... that when the NS forms, the new star overshoots its equilibrium configuration giving a large compression to the neutron core (the core collapses in about 1 sec). This produces a rebound that sends a strong supersonic shock wave in about 0.01 sec that travels through the infalling matter. In a short ...
... that when the NS forms, the new star overshoots its equilibrium configuration giving a large compression to the neutron core (the core collapses in about 1 sec). This produces a rebound that sends a strong supersonic shock wave in about 0.01 sec that travels through the infalling matter. In a short ...
A Compact Central Object in the Supernova Remnant Kes 79
... the remnant of the core of the star which exploded to produce Kes 79. It was not detected in previous X-ray observations because the counting rate of the central source is only ∼ 10−2 that of the entire remnant in the 1-10 keV energy band. The luminosity at 10 kpc distance, in the band 0.3-8 keV, is ...
... the remnant of the core of the star which exploded to produce Kes 79. It was not detected in previous X-ray observations because the counting rate of the central source is only ∼ 10−2 that of the entire remnant in the 1-10 keV energy band. The luminosity at 10 kpc distance, in the band 0.3-8 keV, is ...
The Evening Sky Map
... Mean Time. USA Eastern Standard Time (for example, New York) is 5 hours behind UT. Variable Star – A star that changes brightness over a period of time. ...
... Mean Time. USA Eastern Standard Time (for example, New York) is 5 hours behind UT. Variable Star – A star that changes brightness over a period of time. ...
Introduction to Astronomy
... • Telescopes - ~4”-20+” – Same stuff as with eyes and Binoculars, but…. – Now you will be able to see objects up to 100’s of times more faint – Ability to see fine detail (resolution) ...
... • Telescopes - ~4”-20+” – Same stuff as with eyes and Binoculars, but…. – Now you will be able to see objects up to 100’s of times more faint – Ability to see fine detail (resolution) ...
100 Binocular Deep Sky Objects
... Globular cluster M71 lies near the center of the little constellation Sagitta. M71 is faint even in a 15x70. This particular globular cluster may be one of the youngest globulars. Some even say it is either a very loose young globular or a very old distant open cluster. I see it as a difficult objec ...
... Globular cluster M71 lies near the center of the little constellation Sagitta. M71 is faint even in a 15x70. This particular globular cluster may be one of the youngest globulars. Some even say it is either a very loose young globular or a very old distant open cluster. I see it as a difficult objec ...
Type I SuperNova
... suggests that the Type 1 event happens after the companion has been reduced to a white dwarf. ...
... suggests that the Type 1 event happens after the companion has been reduced to a white dwarf. ...
CONSTELLATION CEPHEUS, KING OF ETHIOPIA Cepheus is a
... diameters. In addition, Cepheus also has the hyperluminous quasar S5 0014+81, hosting an ultramassive black hole in its core at 40 billion solar masses, about 10,000 times more massive than the central black hole of the Milky Way, making it the most massive black hole known in the universe. Cepheus ...
... diameters. In addition, Cepheus also has the hyperluminous quasar S5 0014+81, hosting an ultramassive black hole in its core at 40 billion solar masses, about 10,000 times more massive than the central black hole of the Milky Way, making it the most massive black hole known in the universe. Cepheus ...
spie_poster1 - UMD Physics
... The Ultraviolet and Visible Echelle Spectrograph (UVES) on the European Southern Observatory's Very Large Telescope (VLT) has been used to observe the extended nebular features surrounding h Carinae. We discuss the UVES instrument and our observations of h Carinae, that is, the discovery of the "Gho ...
... The Ultraviolet and Visible Echelle Spectrograph (UVES) on the European Southern Observatory's Very Large Telescope (VLT) has been used to observe the extended nebular features surrounding h Carinae. We discuss the UVES instrument and our observations of h Carinae, that is, the discovery of the "Gho ...
Supernovae and supernova remnants
... of these two components are long-lasting and are seen as a supernova remnant (SNR). As the ejecta expand into the interstellar medium, they sweep up the surrounding interstellar matter. As long as the material swept up is less than the mass of the ejecta, the expansion is considered to be a free exp ...
... of these two components are long-lasting and are seen as a supernova remnant (SNR). As the ejecta expand into the interstellar medium, they sweep up the surrounding interstellar matter. As long as the material swept up is less than the mass of the ejecta, the expansion is considered to be a free exp ...
English version - Richard de Grijs
... “The tails seem to tell us why that is,” said Posselt, adding that the pulsars’ spin and magnetic axis orientations influence what kind of emission is seen on Earth. Geminga may have magnetic poles quite close to the top and bottom of the object, and nearly aligned spin poles, much like Earth. On ...
... “The tails seem to tell us why that is,” said Posselt, adding that the pulsars’ spin and magnetic axis orientations influence what kind of emission is seen on Earth. Geminga may have magnetic poles quite close to the top and bottom of the object, and nearly aligned spin poles, much like Earth. On ...
What is X-ray Astronomy? - Extreme Universe Laboratory
... Plerion: is derived from the Greek word “pleres” which means “full”. Crab nebula is the remnant of Sne explosion (perhaps type II) observed by the Chinese Astronomers in 1054 (July 4th). The pulsar at the center has a period of 33milli-sec. Crab shows pulsed emission from radio to optical to >50 Mev ...
... Plerion: is derived from the Greek word “pleres” which means “full”. Crab nebula is the remnant of Sne explosion (perhaps type II) observed by the Chinese Astronomers in 1054 (July 4th). The pulsar at the center has a period of 33milli-sec. Crab shows pulsed emission from radio to optical to >50 Mev ...
A sound nebula: the origin of the Solar System in the field of a
... high for thermonuclear fusion of hydrogen into helium to continue between explosions, resulting in the birth of a new star – the Sun. The newborn Sun stopped augmenting the sound wave by periodic explosions, and the standing wave diminished. The gas shell previously supported by acoustic pressure be ...
... high for thermonuclear fusion of hydrogen into helium to continue between explosions, resulting in the birth of a new star – the Sun. The newborn Sun stopped augmenting the sound wave by periodic explosions, and the standing wave diminished. The gas shell previously supported by acoustic pressure be ...
The Death of a Star
... become a white dwarf. This is called the Chandrasekhar limit. A core must have a mass of less than 1.4 solar masses to become a white dwarf. ...
... become a white dwarf. This is called the Chandrasekhar limit. A core must have a mass of less than 1.4 solar masses to become a white dwarf. ...
A sound nebula: the origin of the Solar System in the field of a
... high for thermonuclear fusion of hydrogen into helium to continue between explosions, resulting in the birth of a new star – the Sun. The newborn Sun stopped augmenting the sound wave by periodic explosions, and the standing wave diminished. The gas shell previously supported by acoustic pressure be ...
... high for thermonuclear fusion of hydrogen into helium to continue between explosions, resulting in the birth of a new star – the Sun. The newborn Sun stopped augmenting the sound wave by periodic explosions, and the standing wave diminished. The gas shell previously supported by acoustic pressure be ...
Circumstellar
... “Eruption” or shell ejection began in 1950. faded 3 mags or more becoming very red. Spectrum 1985-86 -- M supergiant, CS IR excess Spectrum and energy distribution 2004 -05 F-type, bluer, but stayed faint. ...
... “Eruption” or shell ejection began in 1950. faded 3 mags or more becoming very red. Spectrum 1985-86 -- M supergiant, CS IR excess Spectrum and energy distribution 2004 -05 F-type, bluer, but stayed faint. ...
Supernova
... When the surface layer explodes, the explosion can be violent enough to raise the core temperature above the 7 x 108 K required for the fusion of the carbon/oxygen core of the white dwarf. The carbon/oxygen fuse explosively, blowing the entire system into space and leaving nothing behind. ...
... When the surface layer explodes, the explosion can be violent enough to raise the core temperature above the 7 x 108 K required for the fusion of the carbon/oxygen core of the white dwarf. The carbon/oxygen fuse explosively, blowing the entire system into space and leaving nothing behind. ...
strolympics - Chandra X
... acceleration caused by gravity. On the Earth’s surface, there’s a consistent tug from gravity. However, if you venture to other planets where gravitational forces are different or into space itself where gravity is virtually non-existent, then that object’s weight will change. Mass, however, does no ...
... acceleration caused by gravity. On the Earth’s surface, there’s a consistent tug from gravity. However, if you venture to other planets where gravitational forces are different or into space itself where gravity is virtually non-existent, then that object’s weight will change. Mass, however, does no ...
life cycles of stars
... • Imagine we have a cluster of stars that were all formed at the same time, but have a variety of different masses • Using what we know about stellar evolution is there a way to determine the age of the star cluster? ...
... • Imagine we have a cluster of stars that were all formed at the same time, but have a variety of different masses • Using what we know about stellar evolution is there a way to determine the age of the star cluster? ...
Ch 18
... Fortunately, radio waves are not absorbed much, so molecular gas clouds can be detected even though there may be other gas and dust clouds in the way. These clouds are mostly molecular hydrogen, which unfortunately does not emit in the radio portion of the spectrum. ...
... Fortunately, radio waves are not absorbed much, so molecular gas clouds can be detected even though there may be other gas and dust clouds in the way. These clouds are mostly molecular hydrogen, which unfortunately does not emit in the radio portion of the spectrum. ...
Introduction_to_pulsar_astronomy
... Radio scintillation studies led Hewish and Okoye (1964) to propose the existence of a compact radio source near the center of the nebula, with a steep spectrum. Pacini (1967) proposed the existence of a highly magnetized, rapidly spinning neutron star as the power source of the nebula. This would ra ...
... Radio scintillation studies led Hewish and Okoye (1964) to propose the existence of a compact radio source near the center of the nebula, with a steep spectrum. Pacini (1967) proposed the existence of a highly magnetized, rapidly spinning neutron star as the power source of the nebula. This would ra ...
The Life Cycle of Stars
... whereas a star with a mass that is 10 times (or more) larger than that of the Sun becomes a red supergiant. As a red giant ages it consumes the remaining supply of hydrogen and the core contracts further. This causes the temperature and pressure in the core to once again rise, and the helium-rich co ...
... whereas a star with a mass that is 10 times (or more) larger than that of the Sun becomes a red supergiant. As a red giant ages it consumes the remaining supply of hydrogen and the core contracts further. This causes the temperature and pressure in the core to once again rise, and the helium-rich co ...
Crab Nebula
The Crab Nebula (catalogue designations M1, NGC 1952, Taurus A) is a supernova remnant and pulsar wind nebula in the constellation of Taurus. It is not, as its name might suggest, in Cancer. The now-current name is due to William Parsons, 3rd Earl of Rosse, who observed the object in 1840 using a 36-inch telescope and produced a drawing that looked somewhat like a crab. Corresponding to a bright supernova recorded by Chinese astronomers in 1054, the nebula was observed later by English astronomer John Bevis in 1731. The nebula was the first astronomical object identified with a historical supernova explosion.At an apparent magnitude of 8.4, comparable to that of Saturn's moon Titan, it is not visible to the naked eye but can be made out using binoculars under favourable conditions. The nebula lies in the Perseus Arm of the Milky Way galaxy, at a distance of about 2.0 kiloparsecs (6,500 ly) from Earth. It has a diameter of 3.4 parsecs (11 ly), corresponding to an apparent diameter of some 7 arcminutes, and is expanding at a rate of about 1,500 kilometres per second (930 mi/s), or 0.5% c.At the center of the nebula lies the Crab Pulsar, a neutron star 28–30 kilometres (17–19 mi) across with a spin rate of 30.2 times per second, which emits pulses of radiation from gamma rays to radio waves. At X-ray and gamma ray energies above 30 keV, the Crab is generally the strongest persistent source in the sky, with measured flux extending to above 10 TeV. The nebula's radiation allows for the detailed studying of celestial bodies that occult it. In the 1950s and 1960s, the Sun's corona was mapped from observations of the Crab's radio waves passing through it, and in 2003, the thickness of the atmosphere of Saturn's moon Titan was measured as it blocked out X-rays from the nebula.