17.1 Introduction
... of convection, which then prevents the helium ionization zone from driving the pulsation. For hotter temperatures, the helium ionization zone is located too far out in the atmosphere for significant pulsations to occur. There are complications, of course. Stars spend only a short fraction of their l ...
... of convection, which then prevents the helium ionization zone from driving the pulsation. For hotter temperatures, the helium ionization zone is located too far out in the atmosphere for significant pulsations to occur. There are complications, of course. Stars spend only a short fraction of their l ...
Galaxies on Sub-Galactic Scales
... et al. 1999, Diemand et al. 2005). If these subhalos have accumulated sufficient primordial hydrogen gas and turned it into stars like their more massive brethren they should be visible as small Milky Way satellite galaxies today. However, there were only eleven. Taking these numbers from computer s ...
... et al. 1999, Diemand et al. 2005). If these subhalos have accumulated sufficient primordial hydrogen gas and turned it into stars like their more massive brethren they should be visible as small Milky Way satellite galaxies today. However, there were only eleven. Taking these numbers from computer s ...
here - ESA Science
... Due to the concept of parallax, a star followed for a year appears to draw out a small circle against the background which is actually due to the Earth’s orbit around the Sun – the further away the star, the smaller the circle. This means that at some distance this circle will appear to be a point a ...
... Due to the concept of parallax, a star followed for a year appears to draw out a small circle against the background which is actually due to the Earth’s orbit around the Sun – the further away the star, the smaller the circle. This means that at some distance this circle will appear to be a point a ...
Constellations and the Galactic Plane
... ancients to attribute names and stories to. Orion the hunter, Cygnus the swan, Leo the lion are all familiar names to northern hemisphere night sky watchers. There are 88 named constellations, each having numerous stars. This exercise takes you through some of the most recognizable ones in the Octob ...
... ancients to attribute names and stories to. Orion the hunter, Cygnus the swan, Leo the lion are all familiar names to northern hemisphere night sky watchers. There are 88 named constellations, each having numerous stars. This exercise takes you through some of the most recognizable ones in the Octob ...
Searching for Baby Planets in a Star`s Dusty Rings
... Unfortunately, it’s not clear-cut that the features that have been observed in ALMA images come from planets, because other processes can create them. For example, they could be linked to the condensation or evaporation of dust grains that occur at different distances from the star because of large ...
... Unfortunately, it’s not clear-cut that the features that have been observed in ALMA images come from planets, because other processes can create them. For example, they could be linked to the condensation or evaporation of dust grains that occur at different distances from the star because of large ...
The role of black holes in galaxy formation and evolution
... The energy that jets pump into cavities in a sound crossing time matches the heat needed to keep the gas in thermal equilibrium if this energy equals to pgasVcav with a scatter of a factor of four39 (Fig. 5a). This proportionality, which extends over four orders of magnitude, suggests a self-regulat ...
... The energy that jets pump into cavities in a sound crossing time matches the heat needed to keep the gas in thermal equilibrium if this energy equals to pgasVcav with a scatter of a factor of four39 (Fig. 5a). This proportionality, which extends over four orders of magnitude, suggests a self-regulat ...
Life_Cycle_of_a_Star_Powerpoint
... • The core shrinks and the outer parts expand • It turns red as it is cooling • This phase will last until the star exhausts its remaining fuel. • The pressure of the nuclear reaction is not strong enough to equalize the force of gravity so the star will collapse. ...
... • The core shrinks and the outer parts expand • It turns red as it is cooling • This phase will last until the star exhausts its remaining fuel. • The pressure of the nuclear reaction is not strong enough to equalize the force of gravity so the star will collapse. ...
Introduction to Accretion Phenomena in Astrophysics
... Population II systems: Sun-like stars, later spectral class, longer lifetimes, more common. Example: Her X-1. ...
... Population II systems: Sun-like stars, later spectral class, longer lifetimes, more common. Example: Her X-1. ...
Velocity dispersion around ellipticals in MOND
... galaxies, and they complement stellar absorption kinematical studies (Romanowky et al. 2003). In typical elliptical galaxies, the velocity-dispersion profiles were found to decline with radius, up to 5 effective radii, thereby requiring no dark matter at all. Dekel et al. (2005) show that the data ar ...
... galaxies, and they complement stellar absorption kinematical studies (Romanowky et al. 2003). In typical elliptical galaxies, the velocity-dispersion profiles were found to decline with radius, up to 5 effective radii, thereby requiring no dark matter at all. Dekel et al. (2005) show that the data ar ...
Massive quiescent galaxies at cosmic noon Robert Feldmann UC Berkeley
... mass has been monotonically decreasing since very early • ratedep redshifts. This of decrease is different for different halo masses. At moderate to high redshifts (z > 2), larger halo masses generically have larger average SFRs. However, at lower redshifts, the highest mass halos (Mh ! 1014 M! ) be ...
... mass has been monotonically decreasing since very early • ratedep redshifts. This of decrease is different for different halo masses. At moderate to high redshifts (z > 2), larger halo masses generically have larger average SFRs. However, at lower redshifts, the highest mass halos (Mh ! 1014 M! ) be ...
The dual nature of the Milky Way stellar halo
... predicts galactic stellar halos to be built from multiple accretion events starting from the first structure to collapse in the Universe. Evidences in the past few decades have indicated that the Galactic halo consists of two overlapping structural components, an inner and an outer halo. We provide a ...
... predicts galactic stellar halos to be built from multiple accretion events starting from the first structure to collapse in the Universe. Evidences in the past few decades have indicated that the Galactic halo consists of two overlapping structural components, an inner and an outer halo. We provide a ...
Word
... 3. Furthermore, the approaching galaxies have to approach in roughly the same direction as the other one spins. ...
... 3. Furthermore, the approaching galaxies have to approach in roughly the same direction as the other one spins. ...
Metallicity, Age, and Mass of Star Forming Galaxies at z~3
... Aging z>4 exLBG should be visible in the HDF images as red sources. There are no such galaxies. But we do see z>4 LBGs. Where are they at Z~3? Recurrent SF? Just bad luck in The HDF? ...
... Aging z>4 exLBG should be visible in the HDF images as red sources. There are no such galaxies. But we do see z>4 LBGs. Where are they at Z~3? Recurrent SF? Just bad luck in The HDF? ...
Galaxies
... 3. Furthermore, the approaching galaxies have to approach in roughly the same direction as the other one spins. ...
... 3. Furthermore, the approaching galaxies have to approach in roughly the same direction as the other one spins. ...
The Milky Way Galaxy
... have no dust and no cold gas, hence no star formation. Made mostly of old, metalenriched stars. They like to cluster a lot ...
... have no dust and no cold gas, hence no star formation. Made mostly of old, metalenriched stars. They like to cluster a lot ...
Chapter 34: Cosmology FYI 1. Radar Ranging 2. Triangulation idea
... P4: Consider light observed on earth that was emitted by atoms moving with stars or galaxies. Which statements are true? a. You can actually see little red atoms that have been shifted to the left. They have small beady red eyes and cannot be trusted. b. The spectral colors emitted by the atoms movi ...
... P4: Consider light observed on earth that was emitted by atoms moving with stars or galaxies. Which statements are true? a. You can actually see little red atoms that have been shifted to the left. They have small beady red eyes and cannot be trusted. b. The spectral colors emitted by the atoms movi ...
December 2015
... called the Snowflake Nebula. Rather like a Christmas Tree decoration. Most of the illuminated gas cloud nebulas seen in our skies are emission nebulae. The light emission arises from gases ionized by high energy photons emitted from stars that have often been formed within the nebula. These star for ...
... called the Snowflake Nebula. Rather like a Christmas Tree decoration. Most of the illuminated gas cloud nebulas seen in our skies are emission nebulae. The light emission arises from gases ionized by high energy photons emitted from stars that have often been formed within the nebula. These star for ...
Lab 2: The Planisphere
... RA-Dec coordinates are only good for storing the location of stars in reference books. This coordinate system, called the equatorial system, tells us nothing about how to actually find something in the sky when we go outside. The altitude-azimuth coordinate system, called the horizon system, fulfill ...
... RA-Dec coordinates are only good for storing the location of stars in reference books. This coordinate system, called the equatorial system, tells us nothing about how to actually find something in the sky when we go outside. The altitude-azimuth coordinate system, called the horizon system, fulfill ...
intergalactic move
... If you look up at the sky on a clear night, you might be able to see our own Milky Way. To see any other galaxies you usually need a telescope. However, one of our neighbour galaxies is so big that you can see it using only binoculars! Our giant next-door neighbour is called the Andromeda Galaxy. It ...
... If you look up at the sky on a clear night, you might be able to see our own Milky Way. To see any other galaxies you usually need a telescope. However, one of our neighbour galaxies is so big that you can see it using only binoculars! Our giant next-door neighbour is called the Andromeda Galaxy. It ...
M13 – The Great Hercules Cluster
... asterism but so far have not been able to identify it. If anyone out there can describe it better and tell me how to find it I would be grateful. Lastly, check out the nearby 11th magnitude spiral galaxy NGC 6207. It lies just 30’ to the northeast of M13 and can be seen along with M13 in the same wi ...
... asterism but so far have not been able to identify it. If anyone out there can describe it better and tell me how to find it I would be grateful. Lastly, check out the nearby 11th magnitude spiral galaxy NGC 6207. It lies just 30’ to the northeast of M13 and can be seen along with M13 in the same wi ...
MACHOs
... Instead of using the total time interval for when magnification starts/ends, we need to pick a value for magnification corresponding to a certain point on the graph. o Before, we were finding the Rm at the point when the magnification was just starting to show a change but using the value for the ...
... Instead of using the total time interval for when magnification starts/ends, we need to pick a value for magnification corresponding to a certain point on the graph. o Before, we were finding the Rm at the point when the magnification was just starting to show a change but using the value for the ...
Multi-physics simulations using a hierarchical interchangeable
... is less important than has been found in earlier studies. The most dramatic event in the lifetime of a young cluster is the occurrence of the first supernova, which blows away most of the residual gas in the cluster. But due to earlier fast Wolf-Rayet winds from the massive stars most of the gas has ...
... is less important than has been found in earlier studies. The most dramatic event in the lifetime of a young cluster is the occurrence of the first supernova, which blows away most of the residual gas in the cluster. But due to earlier fast Wolf-Rayet winds from the massive stars most of the gas has ...
Chapter 8 - TeacherWeb
... A star life cycle: first stage: it is a ball of gas and dust. Gravity pulls the dust and gas together into a sphere. As the sphere becomes denser it becomes hotter. Hydrogen changes to helium by a process called nuclear fusion. When a star dies its materials return to space---sometimes to form new s ...
... A star life cycle: first stage: it is a ball of gas and dust. Gravity pulls the dust and gas together into a sphere. As the sphere becomes denser it becomes hotter. Hydrogen changes to helium by a process called nuclear fusion. When a star dies its materials return to space---sometimes to form new s ...
Internal heat production in hot Jupiter exo
... National Laboratory, USA, yielded fission-product helium, as shown in Figure 1, with isotopic compositions within the exact range of compositions typically observed in oceanic basalts14,15. For additional information, see Rao16. At the pressures which exist near the centre of the earth, density beco ...
... National Laboratory, USA, yielded fission-product helium, as shown in Figure 1, with isotopic compositions within the exact range of compositions typically observed in oceanic basalts14,15. For additional information, see Rao16. At the pressures which exist near the centre of the earth, density beco ...