A massive hypergiant star as the progenitor of the supernova SN
... component is gone, indicating that the strong interaction phase is probably over, with the emission now dominated by fast, unshocked ejecta (,10,000 km s–1). From nebular emission lines of nitrogen and oxygen near the supernova location, we can measure the amount of heavy elements in the gaseous env ...
... component is gone, indicating that the strong interaction phase is probably over, with the emission now dominated by fast, unshocked ejecta (,10,000 km s–1). From nebular emission lines of nitrogen and oxygen near the supernova location, we can measure the amount of heavy elements in the gaseous env ...
On the role of GRBs on life extinction in the Universe
... place. Amongst the different kinds of GRBs, long ones are most dangerous. There is a very good chance (but no certainty) that at least one lethal GRB took place during the past 5 Gyr close enough to Earth as to significantly damage life. There is a 50% chance that such a lethal GRB took place during ...
... place. Amongst the different kinds of GRBs, long ones are most dangerous. There is a very good chance (but no certainty) that at least one lethal GRB took place during the past 5 Gyr close enough to Earth as to significantly damage life. There is a 50% chance that such a lethal GRB took place during ...
The extended structure of the dwarf irregular galaxy Sagittarius⋆⋆⋆
... and (b) provides the precious stellar test particles to study the dynamics of these systems at large distances from their centres, thus probing their dark matter (DM) haloes over a wide radial range. The structure and kinematics of the neutral hydrogen provide additional and complementary informatio ...
... and (b) provides the precious stellar test particles to study the dynamics of these systems at large distances from their centres, thus probing their dark matter (DM) haloes over a wide radial range. The structure and kinematics of the neutral hydrogen provide additional and complementary informatio ...
AST 207 Final Exam 14 December 2009
... 6. In 1962 Penzias and Wilson discovered radiation that was “isotropic and free of seasonal variations.” That it was isotropic was used to argue that the radiation was from the Big Bang. Simplicio says, “In 2003, the WMAP satellite found that the radiation is not isotropic. Therefore the radiation i ...
... 6. In 1962 Penzias and Wilson discovered radiation that was “isotropic and free of seasonal variations.” That it was isotropic was used to argue that the radiation was from the Big Bang. Simplicio says, “In 2003, the WMAP satellite found that the radiation is not isotropic. Therefore the radiation i ...
Galactic components Structure and kinematics
... statistics assuming some prior information concerning the stellar population. In practice, •(1) They assume discrete galactic components, each ...
... statistics assuming some prior information concerning the stellar population. In practice, •(1) They assume discrete galactic components, each ...
ASTRO-114--Lecture 37-
... is. If you look with your two eyes and you notice that — well, you don’t even think about it, but your eyes notice that there’s a slightly different perspective. You have a different background behind an object you’re looking at and so you can tell how far away an object is by how much parallax you ...
... is. If you look with your two eyes and you notice that — well, you don’t even think about it, but your eyes notice that there’s a slightly different perspective. You have a different background behind an object you’re looking at and so you can tell how far away an object is by how much parallax you ...
POISE AND EVOLUTION OF THE GALAXY : STRUCTURE ,
... to ensure such a galactic confinement of cosmic rays. Moreover, to be effective, the overall magnetic field for galactic confinement should still stay roughly, but uniformly, perpendicular to the Galaxy plane. Actually, there is no compelling reason for it : magnetic star fields contributing, in fac ...
... to ensure such a galactic confinement of cosmic rays. Moreover, to be effective, the overall magnetic field for galactic confinement should still stay roughly, but uniformly, perpendicular to the Galaxy plane. Actually, there is no compelling reason for it : magnetic star fields contributing, in fac ...
HR Diagram
... Uncheck show luminosity classes and check show instability strip. Note that this region of the HR Diagram indicates where pulsating stars are found such as RR Lyrae stars and Cepheid variable stars. These stars vary in brightness because they are pulsating – alternately growing bigger and smaller – ...
... Uncheck show luminosity classes and check show instability strip. Note that this region of the HR Diagram indicates where pulsating stars are found such as RR Lyrae stars and Cepheid variable stars. These stars vary in brightness because they are pulsating – alternately growing bigger and smaller – ...
PEGASUS, THE FLYING HORSE Pegasus is a constellation in the
... with a redshift of 0.0027. It was discovered by musician-astronomer William Herschel in 1784 and was later one of the first nebulous objects to be described as "spiral" by William Parsons. Another of Pegasus's galaxies is NGC 7742, a Type 2 Seyfert galaxy. Located at a distance of 77 million light-y ...
... with a redshift of 0.0027. It was discovered by musician-astronomer William Herschel in 1784 and was later one of the first nebulous objects to be described as "spiral" by William Parsons. Another of Pegasus's galaxies is NGC 7742, a Type 2 Seyfert galaxy. Located at a distance of 77 million light-y ...
Infrared Properties of Star-Forming Dwarf Galaxies. I. Dwarf Irregular
... A sample of 34 dwarf irregular galaxies (dIs) in the Local Volume, most nearer than 5 Mpc, has been imaged in the near-infrared (NIR) in J and Ks at the Canada-France-Hawaii Telescope (CFHT) in Hawaii and the Observatorio Astronómico Nacional in the Sierra San Pedro Mártir, in Mexico. Absolute mag ...
... A sample of 34 dwarf irregular galaxies (dIs) in the Local Volume, most nearer than 5 Mpc, has been imaged in the near-infrared (NIR) in J and Ks at the Canada-France-Hawaii Telescope (CFHT) in Hawaii and the Observatorio Astronómico Nacional in the Sierra San Pedro Mártir, in Mexico. Absolute mag ...
42 SCIENTIFIC AMERICAN OCTOBER 2006 TEN
... reaches the density of an atomic nucleus. Like a crystal vase falling onto a concrete floor, the collapsing material releases enough gravitational potential energy to blow the rest of the star apart. An alternative emerged in 1960, when Fred Hoyle of the University of Cambridge and Willy Fowler of C ...
... reaches the density of an atomic nucleus. Like a crystal vase falling onto a concrete floor, the collapsing material releases enough gravitational potential energy to blow the rest of the star apart. An alternative emerged in 1960, when Fred Hoyle of the University of Cambridge and Willy Fowler of C ...
File 11 - School of Astronomy, IPM
... South Africa has had a long and rich history of Stellar astronomy. In 1833, the first ever measurement of the distance to a star (Alpha Centauri) was made. To continue tradition, group is working on- Transients e.g., novae and supernovae; interacting binaries e.g., cataclysmic variables, symbiotic a ...
... South Africa has had a long and rich history of Stellar astronomy. In 1833, the first ever measurement of the distance to a star (Alpha Centauri) was made. To continue tradition, group is working on- Transients e.g., novae and supernovae; interacting binaries e.g., cataclysmic variables, symbiotic a ...
Here - Amateur Observers` Society of New York
... the earth, the moon is closely enough aligned to hide at least part of the sun, as viewed from the earth. A lunar eclipse occurs when, on passing between the sun and the moon, the earth is closely enough aligned to hide at least some of the moon. For both solar and lunar eclipses, use the prediction ...
... the earth, the moon is closely enough aligned to hide at least part of the sun, as viewed from the earth. A lunar eclipse occurs when, on passing between the sun and the moon, the earth is closely enough aligned to hide at least some of the moon. For both solar and lunar eclipses, use the prediction ...
The stellar populations of Lyman Break Galaxies at z~5 in...
... We present the results of SED fitting analysis for Lyman Break Galaxies at z~5 in the GOODS-N/MODS region. With deep MOIRCS NIR images and IRAC images, we constructed the rest-frame UVoptical SEDs for ~130 LBGs. The contamination in IRAC images by neighboring objects is subtracted by using a PSF fit ...
... We present the results of SED fitting analysis for Lyman Break Galaxies at z~5 in the GOODS-N/MODS region. With deep MOIRCS NIR images and IRAC images, we constructed the rest-frame UVoptical SEDs for ~130 LBGs. The contamination in IRAC images by neighboring objects is subtracted by using a PSF fit ...
VISIBLE STARS AS APPARENT OBSERVATIONAL EVIDENCE IN
... in the course of refuting opponents of Copernicus: These opponents of Copernicus make certain calculations based on the premise that, although the earth's motion in its annual orbit produces some curious and extremely large changes in the case of the planets, it does not cause any similar effects in ...
... in the course of refuting opponents of Copernicus: These opponents of Copernicus make certain calculations based on the premise that, although the earth's motion in its annual orbit produces some curious and extremely large changes in the case of the planets, it does not cause any similar effects in ...
Inverse Square Law
... From everyday experience, it is obvious that light sources appear to become brighter as you move closer to them. The apparent brightness of the source is related to its distance. However, moving a light source twice as close to you does not make it twice as bright. In this lab, we will examine this ...
... From everyday experience, it is obvious that light sources appear to become brighter as you move closer to them. The apparent brightness of the source is related to its distance. However, moving a light source twice as close to you does not make it twice as bright. In this lab, we will examine this ...
sBzKs
... very similar, clustering amplitudes ~10 times higher than generic galaxies in the same magnitude range. This suggests an evolutionary link between sBzKs at z~2 and EROs at z~1, with star formation on sBzKs quenching by z~1 thus producing passively evolving EROs. The clustering amplitude of pBzKs is ...
... very similar, clustering amplitudes ~10 times higher than generic galaxies in the same magnitude range. This suggests an evolutionary link between sBzKs at z~2 and EROs at z~1, with star formation on sBzKs quenching by z~1 thus producing passively evolving EROs. The clustering amplitude of pBzKs is ...
t 0 (radioactive decay)
... energy and turn into new “daughter” isotopes. The parent isotope’s half-life defines the rate at which this decay occurs. Some isotopes decay too quickly to be used as chronometers. Other isotopes decay more slowly, making them useful for estimating the age of very old objects. For example, 232Th de ...
... energy and turn into new “daughter” isotopes. The parent isotope’s half-life defines the rate at which this decay occurs. Some isotopes decay too quickly to be used as chronometers. Other isotopes decay more slowly, making them useful for estimating the age of very old objects. For example, 232Th de ...
The evolution of galaxy groups
... patches with deep Magellan spectroscoopy • Only 1.5 orbits obtained so far • Preliminary match with CNOC2 spectroscopy shows we detect most group members in the near-UV (rest frame far-UV) ...
... patches with deep Magellan spectroscoopy • Only 1.5 orbits obtained so far • Preliminary match with CNOC2 spectroscopy shows we detect most group members in the near-UV (rest frame far-UV) ...
Computer Simulation of Dark Matter Effects on Galaxy Collisions
... colliding including dark matter mass. The questions this project will answer are: How will dark matter effect colliding galaxies, how accurately can this be modeled, how big of an impact does dark matter have on colliding galaxies. Last year, a computer program was developed to model the effects dar ...
... colliding including dark matter mass. The questions this project will answer are: How will dark matter effect colliding galaxies, how accurately can this be modeled, how big of an impact does dark matter have on colliding galaxies. Last year, a computer program was developed to model the effects dar ...
Absolute magnitudes and kinematics of barium
... (Jorissen & Boffin 1992) and that the orbital period is related to the orbital separation. It may be possible that mild barium stars have wider separations between components, making more difficult the detection of their binary nature. If we consider the stars with known orbits or with variable radi ...
... (Jorissen & Boffin 1992) and that the orbital period is related to the orbital separation. It may be possible that mild barium stars have wider separations between components, making more difficult the detection of their binary nature. If we consider the stars with known orbits or with variable radi ...
Document
... • The luminosity of a star represents the amount of energy emitted per second. There must be a source of this energy, and it cannot last forever. • The amount of “fuel” a star has is proportional to its initial mass. • The length of time the fuel can be spent is equal to the amount of fuel divided b ...
... • The luminosity of a star represents the amount of energy emitted per second. There must be a source of this energy, and it cannot last forever. • The amount of “fuel” a star has is proportional to its initial mass. • The length of time the fuel can be spent is equal to the amount of fuel divided b ...
Lab PDF - NMSU Astronomy
... regardless of their luminosity or surface temperature, will lie along this line. In which corner of the diagram (upper right, upper left, lower right, or lower left) would stars with radii 1000 times larger than that of the Sun be plotted? In which corner would stars with radii 1000 times smaller th ...
... regardless of their luminosity or surface temperature, will lie along this line. In which corner of the diagram (upper right, upper left, lower right, or lower left) would stars with radii 1000 times larger than that of the Sun be plotted? In which corner would stars with radii 1000 times smaller th ...
Pretty Pictures of the Cosmos
... with the Hubble Space Telescope, distant galaxies form a dramatic backdrop for disrupted spiral galaxy Arp 188, the Tadpole Galaxy. The cosmic Tadpole is a mere 420 million light-years distant toward the northern constellation Draco. Its eye-catching tail is about 280 thousand light-years long and f ...
... with the Hubble Space Telescope, distant galaxies form a dramatic backdrop for disrupted spiral galaxy Arp 188, the Tadpole Galaxy. The cosmic Tadpole is a mere 420 million light-years distant toward the northern constellation Draco. Its eye-catching tail is about 280 thousand light-years long and f ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.