![Abd al-Rahman al-Sufi and his book of the fixed stars: a journey of](http://s1.studyres.com/store/data/013478864_1-82ef219850d3d134c973b3a46d47911e-300x300.png)
Abd al-Rahman al-Sufi and his book of the fixed stars: a journey of
... so on, which should be highlighted for their own. My justification in writing this thesis is that very few people have access to al-Ṣūfī’s work and many researchers believe that an English translation and a study of such works by Arab astronomers are very important at this time. This turned out to b ...
... so on, which should be highlighted for their own. My justification in writing this thesis is that very few people have access to al-Ṣūfī’s work and many researchers believe that an English translation and a study of such works by Arab astronomers are very important at this time. This turned out to b ...
Exploring Neutral Hydrogen and Galaxy Evolution with the SKA
... Analysis of thousands of galaxies in the Sloan Digital Sky Survey (SDSS) has shown that they follow a bimodal distribution in colour as a function of stellar mass (Baldry et al. (2004)); most galaxies are either located in the so-called blue cloud or on the red sequence, indicating that star formati ...
... Analysis of thousands of galaxies in the Sloan Digital Sky Survey (SDSS) has shown that they follow a bimodal distribution in colour as a function of stellar mass (Baldry et al. (2004)); most galaxies are either located in the so-called blue cloud or on the red sequence, indicating that star formati ...
Introduction to Observational Cosmology
... Structure (Size, bulge-to-disc ratio, etc..) Dynamical mass Star formation rate Color (or spectral energy distribution) of the stellar population ...
... Structure (Size, bulge-to-disc ratio, etc..) Dynamical mass Star formation rate Color (or spectral energy distribution) of the stellar population ...
Digital Universe Guide - American Museum of Natural History
... fader and sets the transparency of the green polygons that represent the open clusters. Moving the slider up and down, you can see that this is another way to effectively set the brightness of the polygons. ...
... fader and sets the transparency of the green polygons that represent the open clusters. Moving the slider up and down, you can see that this is another way to effectively set the brightness of the polygons. ...
Masses of Dwarf Satellites of the Milky Way
... Here, Lgal and LMW are the individual probability distributions of Segue 1 and the Milky Way galaxies parameterized by the set Mgal,MW . The metallicity distribution of the member and nonmember stars are each modeled by Gaussians with mean metallicities w̄gal , w̄MW and widths σw,gal , σw,MW respect ...
... Here, Lgal and LMW are the individual probability distributions of Segue 1 and the Milky Way galaxies parameterized by the set Mgal,MW . The metallicity distribution of the member and nonmember stars are each modeled by Gaussians with mean metallicities w̄gal , w̄MW and widths σw,gal , σw,MW respect ...
Research Papers-Cosmology/Download/6307
... galaxies rotate around a common center under the law of the rotation of a rigid body and only the stars in the spiral arms have a speed which decreases with the increasing the distance from the nucleus. The same picture of the velocity distribution, as is known, is characteristic for the flows insid ...
... galaxies rotate around a common center under the law of the rotation of a rigid body and only the stars in the spiral arms have a speed which decreases with the increasing the distance from the nucleus. The same picture of the velocity distribution, as is known, is characteristic for the flows insid ...
Trapezium Fracture
... begin to understand the ultimate of their own world? Perhaps these beings will not have evolved on the Orion home worlds at all, but travelled to them from another distant place, and when they peer curiously at our own long dead region of space, it will not be in order to understand their ultimate f ...
... begin to understand the ultimate of their own world? Perhaps these beings will not have evolved on the Orion home worlds at all, but travelled to them from another distant place, and when they peer curiously at our own long dead region of space, it will not be in order to understand their ultimate f ...
pvb-based star compositions
... portion of magnalium, is particularly bright and burns fiercely, with a tendency to jet. The orange star is adjusted to my taste in colour; if you prefer a different shade, you might want to alter the relative proportions of calcium carbonate and cryolite. The compositions listed in Table 2 are reas ...
... portion of magnalium, is particularly bright and burns fiercely, with a tendency to jet. The orange star is adjusted to my taste in colour; if you prefer a different shade, you might want to alter the relative proportions of calcium carbonate and cryolite. The compositions listed in Table 2 are reas ...
Test 3 Review Clicker Questions
... a) there are no stars there. b) stars in that direction are obscured by interstellar gas. c) stars in that direction are obscured by interstellar dust. d) numerous black holes capture all the starlight behind them. ...
... a) there are no stars there. b) stars in that direction are obscured by interstellar gas. c) stars in that direction are obscured by interstellar dust. d) numerous black holes capture all the starlight behind them. ...
The ages of pre-main-sequence stars
... models in this range. We describe our models in detail in the following sections, but note that, because we use very similar physics, they do not differ greatly from those of D'Antona & Mazzitelli. However, stars do continue to accrete long after their photospheres are exposed, and they can be place ...
... models in this range. We describe our models in detail in the following sections, but note that, because we use very similar physics, they do not differ greatly from those of D'Antona & Mazzitelli. However, stars do continue to accrete long after their photospheres are exposed, and they can be place ...
X. Nuclear star clusters in low-mass early-type galaxies
... computations, the theoretical framework for the dissipational formation of NSCs provides less quantitative predictions than the inspiralling cluster scenario. There is evidence that both the in situ as well as the GC inspiralling formation happen in galaxies. Evidence for the GC inspiral scenario is ...
... computations, the theoretical framework for the dissipational formation of NSCs provides less quantitative predictions than the inspiralling cluster scenario. There is evidence that both the in situ as well as the GC inspiralling formation happen in galaxies. Evidence for the GC inspiral scenario is ...
Clusters as laboratories for the study of galaxy evolution
... may become as useful as star clusters are in the study of stellar evolution” -- Dressler, 1984 Annual Reviews Back in 1984, (and still?) the prevalent view was that clusters were themselves agents that influenced the evolution of galaxies, so that the processes that produced different morphological ...
... may become as useful as star clusters are in the study of stellar evolution” -- Dressler, 1984 Annual Reviews Back in 1984, (and still?) the prevalent view was that clusters were themselves agents that influenced the evolution of galaxies, so that the processes that produced different morphological ...
The ATLAS3D project-XXII. Low-efficiency star formation in early
... simulations of gas discs embedded in isolated early-type and spiral galaxies. Despite using a universal local law to form stars in the simulations, we find that the earlytype galaxies are offset from the spirals on the large-scale Kennicutt relation, and form stars two to five times less efficiently ...
... simulations of gas discs embedded in isolated early-type and spiral galaxies. Despite using a universal local law to form stars in the simulations, we find that the earlytype galaxies are offset from the spirals on the large-scale Kennicutt relation, and form stars two to five times less efficiently ...
Measuring distances to the edge of the local group
... We propose to measure the distance to the nearby dwarf irregular galaxies Sextans A, B, and NGC 3109 using Cepheid variable stars. These stars have a well-known period-luminosity relationship caused by the radial pulsation of the star, which was first characterized by Leavitt in 1912. They can thus ...
... We propose to measure the distance to the nearby dwarf irregular galaxies Sextans A, B, and NGC 3109 using Cepheid variable stars. These stars have a well-known period-luminosity relationship caused by the radial pulsation of the star, which was first characterized by Leavitt in 1912. They can thus ...
NAS biographical memoir of Martin Schwarzschild
... deadly skin disease) and died in 1916. The solution is still called the “Schwarzschild solution” and the critical inner radius is termed the “Schwarzschild radius.” Martin’s uncle by marriage, Robert Emden, a professor of physics and meteorology, had published the famous book Gaskugeln (“Gas spheres ...
... deadly skin disease) and died in 1916. The solution is still called the “Schwarzschild solution” and the critical inner radius is termed the “Schwarzschild radius.” Martin’s uncle by marriage, Robert Emden, a professor of physics and meteorology, had published the famous book Gaskugeln (“Gas spheres ...
Chapter 24
... Intermediate between the E7 ellipticals and the Sa spirals in the Hubble classification is a class of galaxies that show evidence of a thin disk and a flattened bulge, but that contain no gas and no spiral arms. Two such objects are shown in Figure 24.6. These galaxies are known as S0 galaxies if no ...
... Intermediate between the E7 ellipticals and the Sa spirals in the Hubble classification is a class of galaxies that show evidence of a thin disk and a flattened bulge, but that contain no gas and no spiral arms. Two such objects are shown in Figure 24.6. These galaxies are known as S0 galaxies if no ...
Preview Sample 2
... C) depends on the star's right ascension. D) depends on the observer's latitude. E) depends on the observer's longitude. Answer: D 17) Suppose you live at latitude 40°N. Which of the following describes the conditions that make a star circumpolar? A) Stars are circumpolar if they have declination > ...
... C) depends on the star's right ascension. D) depends on the observer's latitude. E) depends on the observer's longitude. Answer: D 17) Suppose you live at latitude 40°N. Which of the following describes the conditions that make a star circumpolar? A) Stars are circumpolar if they have declination > ...
Ursa Major
![](https://commons.wikimedia.org/wiki/Special:FilePath/Big_dipper.triddle.jpg?width=300)
Ursa Major /ˈɜrsə ˈmeɪdʒər/ (also known as the Great Bear and Charles' Wain) is a constellation in the northern celestial hemisphere. One of the 48 constellations listed by Ptolemy (second century AD), it remains one of the 88 modern constellations. It can be visible throughout the year in most of the northern hemisphere. Its name, Latin for ""the greater (or larger) she-bear"", stands as a reference to and in direct contrast with Ursa Minor, ""the smaller she-bear"", with which it is frequently associated in mythology and amateur astronomy. The constellation's most recognizable asterism, a group of seven relatively bright stars commonly known as the ""Big Dipper"", ""the Wagon"" or ""the Plough"" (among others), both mimicks the shape of the lesser bear (the ""Little Dipper"") and is commonly used as a navigational pointer towards the current northern pole star, Polaris in Ursa Minor. The Big Dipper and the constellation as a whole have mythological significance in numerous world cultures, usually as a symbol of the north.The third largest constellation in the sky, Ursa Major is home to many deep-sky objects including seven Messier objects, four other NGC objects and I Zwicky 18, the youngest known galaxy in the visible universe.