![Archaeoastronomy, Astronomy of Celts, A. Gaspani](http://s1.studyres.com/store/data/007749629_1-0e13c8c2d0b10f25173559f2a7f3c53f-300x300.png)
in search of antimatter in the universe
... Spiral galaxies do not often feature AGN, and so instead, we consider elliptical galaxies, which have stars evenly distributed throughout the volume of an ellipse. One such galaxy is Centaurus A, which is the closest galaxy to us with an AGN jet, at 3.7 Mega parsecs (1 parsec is 3.1x1016 m). This me ...
... Spiral galaxies do not often feature AGN, and so instead, we consider elliptical galaxies, which have stars evenly distributed throughout the volume of an ellipse. One such galaxy is Centaurus A, which is the closest galaxy to us with an AGN jet, at 3.7 Mega parsecs (1 parsec is 3.1x1016 m). This me ...
cranmer_nessc_oct2008
... • Rivinius et al. (1998, 2001) found correlations between emission-line “outbursts” and constructive interference (“beating”) between NRP periods. ...
... • Rivinius et al. (1998, 2001) found correlations between emission-line “outbursts” and constructive interference (“beating”) between NRP periods. ...
2_ISM - UCT Astronomy Department
... observing the same (standard) source several time during the night with a wide variety in zenith distances – usually well known for established Observatories. ...
... observing the same (standard) source several time during the night with a wide variety in zenith distances – usually well known for established Observatories. ...
Rotational Doppler beaming in eclipsing binaries
... orbital Doppler beaming has been included in the simulations, but, for clarity and simplicity, additional effects such as ellipsoidal variations, the reflection effect and gravitational lensing have not been included. For illustration purposes all binaries are assumed to be seen exactly edge-on (i=9 ...
... orbital Doppler beaming has been included in the simulations, but, for clarity and simplicity, additional effects such as ellipsoidal variations, the reflection effect and gravitational lensing have not been included. For illustration purposes all binaries are assumed to be seen exactly edge-on (i=9 ...
Full Poster - Cool Cosmos
... these wavelengths. X-rays and gamma rays are produced by matter which is heated to millions of degrees and are often caused by cosmic explosions, high speed collisions, or by material moving at extremely high speeds. This radiation has such high energy that specially made, angled mirrors must be use ...
... these wavelengths. X-rays and gamma rays are produced by matter which is heated to millions of degrees and are often caused by cosmic explosions, high speed collisions, or by material moving at extremely high speeds. This radiation has such high energy that specially made, angled mirrors must be use ...
Nucleosynthesis and Chemical Evolution of Oxygen
... To analyze the yields from massive stars, we consider a single model. While this is only one particular model, its yields are fairly representative of the ejecta from any star more than ten times the mass of the Sun. Chemical evolution models using detailed stellar model yields have long shown that ...
... To analyze the yields from massive stars, we consider a single model. While this is only one particular model, its yields are fairly representative of the ejecta from any star more than ten times the mass of the Sun. Chemical evolution models using detailed stellar model yields have long shown that ...
THE NEUTRAL GAS DYNAMICS OF THE NEARBY MAGELLANIC
... detailed studies of galactic rotational dynamics in the absence of differential shear. Many dwarfs display solidbody rotation that is well-suited to precision rotation curve work (e.g., Oh et al. 2008). Most nearby systems appear to be dark-matter dominated (Mateo 1998), making them important labora ...
... detailed studies of galactic rotational dynamics in the absence of differential shear. Many dwarfs display solidbody rotation that is well-suited to precision rotation curve work (e.g., Oh et al. 2008). Most nearby systems appear to be dark-matter dominated (Mateo 1998), making them important labora ...
The loss of nitrogen-rich atmospheres from Earth-like
... will also search for atmospheric species which are considered as bio-markers (e.g. O3 , H2 O, CH4 , etc.). By using the Earth with its atmosphere as a proxy and in agreement with the classical habitable zone concept, one should expect that Earth-like exoplanets suitable for life as we know it should ...
... will also search for atmospheric species which are considered as bio-markers (e.g. O3 , H2 O, CH4 , etc.). By using the Earth with its atmosphere as a proxy and in agreement with the classical habitable zone concept, one should expect that Earth-like exoplanets suitable for life as we know it should ...
A Collection of Curricula for the STARLAB Polynesian Voyaging
... people to regard them as akin to astrologers and oracles. Such a Hawaiian expert was called a kilo (seer, prophet, or judge; one who "looks earnestly"). Basically all this went back to a knowledge of the heavenly bodies and their apparent motions, upon which the Hawaiian calendar was based. The app ...
... people to regard them as akin to astrologers and oracles. Such a Hawaiian expert was called a kilo (seer, prophet, or judge; one who "looks earnestly"). Basically all this went back to a knowledge of the heavenly bodies and their apparent motions, upon which the Hawaiian calendar was based. The app ...
ChAPTER 10 sTARS
... 4. If you add more total energy to a wave (as you did in Step 7), what happens to the a. Frequency of the wave ? b. Wavelength of the wave? 5. A wave moves 12m in 5 seconds. There are 6 complete waves produced in that distance and time. Using this information, complete the tasks and answer the follo ...
... 4. If you add more total energy to a wave (as you did in Step 7), what happens to the a. Frequency of the wave ? b. Wavelength of the wave? 5. A wave moves 12m in 5 seconds. There are 6 complete waves produced in that distance and time. Using this information, complete the tasks and answer the follo ...
Sample
... neutron star with a mass that is three times greater than the mass of the Sun cannot hold itself up under its own gravity and will compress into an infinitesimal point called a singularity, where the original matter is lost from view forever and only gravity remains, thus forming what is referred to ...
... neutron star with a mass that is three times greater than the mass of the Sun cannot hold itself up under its own gravity and will compress into an infinitesimal point called a singularity, where the original matter is lost from view forever and only gravity remains, thus forming what is referred to ...
Accuracy of spectroscopy-based radioactive dating of stars
... obtained by propagating the error in Eq. (5). One may also try to derive an equivalent width for the blended line by subtracting the theoretical equivalent width of the blending components from the total W of the blend. However, in general, this ignores saturation effects, and thus the “corrected” W ...
... obtained by propagating the error in Eq. (5). One may also try to derive an equivalent width for the blended line by subtracting the theoretical equivalent width of the blending components from the total W of the blend. However, in general, this ignores saturation effects, and thus the “corrected” W ...
Galaxies
... e. the diameter of the Milky Way galaxy. 30. Which of the following is not used as a distance indicator? a. large globular clusters b. Herbig-Haro objects c. H II regions d. Cepheid variable stars e. Supernovae 31. The look-back time is a. the time it takes for the light from an object to reach Eart ...
... e. the diameter of the Milky Way galaxy. 30. Which of the following is not used as a distance indicator? a. large globular clusters b. Herbig-Haro objects c. H II regions d. Cepheid variable stars e. Supernovae 31. The look-back time is a. the time it takes for the light from an object to reach Eart ...
LAB #5 - GEOCITIES.ws
... The early spectral classification system was based on the appearance of the spectra, but the physical reason for these differences in spectra were not understood until the 1930’s and 1940’s. Then it was realized that, while there were some chemical differences among stars, the main thing that determ ...
... The early spectral classification system was based on the appearance of the spectra, but the physical reason for these differences in spectra were not understood until the 1930’s and 1940’s. Then it was realized that, while there were some chemical differences among stars, the main thing that determ ...
Lecture 2
... Most galaxies are too far away to pick out their Cepheid variables. How do we measure distances to them? Using atomic spectra, Doppler shifts and the Hubble law. ...
... Most galaxies are too far away to pick out their Cepheid variables. How do we measure distances to them? Using atomic spectra, Doppler shifts and the Hubble law. ...
The Interstellar Medium White Paper
... clouds that are long-lived and stable, supported against gravity by internal turbulence and magnetic fields. This contrasts strongly with the picture given by mechanism (iv), of compression in converging flows, where gravity plays little role. It produces molecular clouds that are transient features ...
... clouds that are long-lived and stable, supported against gravity by internal turbulence and magnetic fields. This contrasts strongly with the picture given by mechanism (iv), of compression in converging flows, where gravity plays little role. It produces molecular clouds that are transient features ...
astro-ph/0504597 PDF
... and electrons are pushed together to form neutrons and neutrinos. Even though neutrinos don’t interact easily with matter, at densities as high as they are here, they exert a tremendous outward pressure. The other is, outer layers fall inward when the iron core collapses. When the core stops collaps ...
... and electrons are pushed together to form neutrons and neutrinos. Even though neutrinos don’t interact easily with matter, at densities as high as they are here, they exert a tremendous outward pressure. The other is, outer layers fall inward when the iron core collapses. When the core stops collaps ...
Observational properties of stars
... concentrated into a point). The object was visible in the sky for 2 years. A supernova remnant is associated with this event, and currently it is thought to have been a Type Ia. SN1054 – (July 4) in Taurus, observed by Arabic, Chinese, Japanese astronomers, peak of V = -6, again brighter than Venus. ...
... concentrated into a point). The object was visible in the sky for 2 years. A supernova remnant is associated with this event, and currently it is thought to have been a Type Ia. SN1054 – (July 4) in Taurus, observed by Arabic, Chinese, Japanese astronomers, peak of V = -6, again brighter than Venus. ...
When we look at a neighboring galaxy (such as M31, the
... Massive stars don't live very long (a few million years, a mere cosmic eye blink by most standards) and this advanced evolutionary stage is short-lived indeed, about 100,000 to 500,000 years. Consider that this is comparable to the time it takes for a photon to make its way from the core of the sun ...
... Massive stars don't live very long (a few million years, a mere cosmic eye blink by most standards) and this advanced evolutionary stage is short-lived indeed, about 100,000 to 500,000 years. Consider that this is comparable to the time it takes for a photon to make its way from the core of the sun ...
Stellar kinematics
Stellar kinematics is the study of the movement of stars without needing to understand how they acquired their motion. This differs from stellar dynamics, which takes into account gravitational effects. The motion of a star relative to the Sun can provide useful information about the origin and age of a star, as well as the structure and evolution of the surrounding part of the Milky Way.In astronomy, it is widely accepted that most stars are born within molecular clouds known as stellar nurseries. The stars formed within such a cloud compose open clusters containing dozens to thousands of members. These clusters dissociate over time. Stars that separate themselves from the cluster's core are designated as members of the cluster's stellar association. If the remnant later drifts through the Milky Way as a coherent assemblage, then it is termed a moving group.