An Introduction to Astronomy and Cosmology
... • It was discovered that the brightest (first magnitude) were about 100 times brighter than the faintest (sixth magnitude) • This was made a definition. – 5 magnitudes = a factor of 100 in brightness – So a star of 1st magnitude is exactly 100 times brighter than one of 6th magnitude. ...
... • It was discovered that the brightest (first magnitude) were about 100 times brighter than the faintest (sixth magnitude) • This was made a definition. – 5 magnitudes = a factor of 100 in brightness – So a star of 1st magnitude is exactly 100 times brighter than one of 6th magnitude. ...
5X_Measuring_galaxy_redshifts
... galaxies to be recorded simultaneously. (SALT uses mulitple slits to allow for MOS-Mulit-object spectroscopy) They use optical fibres to isolate light from different galaxies in the focal plane of the telescope. One technique is to locate the image in the focal plane in register with that of a metal ...
... galaxies to be recorded simultaneously. (SALT uses mulitple slits to allow for MOS-Mulit-object spectroscopy) They use optical fibres to isolate light from different galaxies in the focal plane of the telescope. One technique is to locate the image in the focal plane in register with that of a metal ...
The Dark Age of the Universe
... form by cooling provided by heavy elements (46), or by atomic H when Tvir ⬎ 104 K. Abundances of heavy elements as low as 1000 times smaller than that of the sun can increase the cooling rate over that provided by H2 and can also cool the gas to much lower temperatures than possible with H2 alone, r ...
... form by cooling provided by heavy elements (46), or by atomic H when Tvir ⬎ 104 K. Abundances of heavy elements as low as 1000 times smaller than that of the sun can increase the cooling rate over that provided by H2 and can also cool the gas to much lower temperatures than possible with H2 alone, r ...
Constellations and Distances to Stars
... How can we locate objects in the sky like we do on Earth when we don’t have any coordinates like latitude and longitude? • There are coordinates, but they are called declination and right ascension and we can use a celestial sphere as a model of the sky. The celestial sphere is simply an imaginary ...
... How can we locate objects in the sky like we do on Earth when we don’t have any coordinates like latitude and longitude? • There are coordinates, but they are called declination and right ascension and we can use a celestial sphere as a model of the sky. The celestial sphere is simply an imaginary ...
The Hidden Lives of Galaxies NSTA 2001
... A number of elliptical galaxies are observed to have hot gas beyond the visible limits of the galaxy. The temperature of the gas is a measure of its velocity and energy. This gas is so hot (about 10 million degrees Kelvin, or 18 million degrees F), and consequently has such a high velocity, that it ...
... A number of elliptical galaxies are observed to have hot gas beyond the visible limits of the galaxy. The temperature of the gas is a measure of its velocity and energy. This gas is so hot (about 10 million degrees Kelvin, or 18 million degrees F), and consequently has such a high velocity, that it ...
Astronomy Teleclass Webinar!
... Neutron stars with HUGE magnetic fields are known as magnetars. Neutron stars are formed from stars that go supernova, but aren’t big and fat enough to turn into a black hole. The Oort Cloud lies just beyond the Kuiper belt, housing an estimated 1 trillion comets. The visible surface of the sun ...
... Neutron stars with HUGE magnetic fields are known as magnetars. Neutron stars are formed from stars that go supernova, but aren’t big and fat enough to turn into a black hole. The Oort Cloud lies just beyond the Kuiper belt, housing an estimated 1 trillion comets. The visible surface of the sun ...
Astronomy
... Directions: Answer the following questions with the most correct answers. TRUE/FALSE: 1. _____ Hubble classified galaxies 2. _____ There are three main classifications of galaxies 3. _____ Elliptical galaxies have little or no star formation 4. _____ Elliptical galaxies have little or no rotation 5. ...
... Directions: Answer the following questions with the most correct answers. TRUE/FALSE: 1. _____ Hubble classified galaxies 2. _____ There are three main classifications of galaxies 3. _____ Elliptical galaxies have little or no star formation 4. _____ Elliptical galaxies have little or no rotation 5. ...
M.C. Runacres S.P. Owocki It is well known that the winds of hot
... In a previous paper (Runacres & Owocki 2002) we studied the evolution of wind structure up to a distance of 100R , using one-dimensional, time-dependent hydrodynamical models that take into account the instability of line-driving. In these models, the wind material is compressed into a sequence of ...
... In a previous paper (Runacres & Owocki 2002) we studied the evolution of wind structure up to a distance of 100R , using one-dimensional, time-dependent hydrodynamical models that take into account the instability of line-driving. In these models, the wind material is compressed into a sequence of ...
How Far Can You See?
... example, boasting hundreds of billions of stars in a spiral-spangled disk roughly 100,000 light-years across. The nearest such spiral galaxy to our own is the Andromeda Galaxy, which is about 21⁄2 million light-years away. It is visible to the unaided eye as a faint smudge in the autumn sky (see pag ...
... example, boasting hundreds of billions of stars in a spiral-spangled disk roughly 100,000 light-years across. The nearest such spiral galaxy to our own is the Andromeda Galaxy, which is about 21⁄2 million light-years away. It is visible to the unaided eye as a faint smudge in the autumn sky (see pag ...
MIR_absorption
... properties (temperature, density) and molecular content of infalling envelopes and disk atmospheres. By targeting young (<1 Myr old) Class I objects, sources that possess an associated molecular cloud core as well as a central forming star, we will be able to relate the properties of the infalling ...
... properties (temperature, density) and molecular content of infalling envelopes and disk atmospheres. By targeting young (<1 Myr old) Class I objects, sources that possess an associated molecular cloud core as well as a central forming star, we will be able to relate the properties of the infalling ...
Weighing a galaxy
... Stars and gas orbit around the centres of spiral galaxies in much the same way as the Earth orbits around the Sun. The more mass a galaxy contains, the faster the orbits have to be. If the orbit is not fast enough, the orbital radius will decrease in the same way as artificial satellites orbiting th ...
... Stars and gas orbit around the centres of spiral galaxies in much the same way as the Earth orbits around the Sun. The more mass a galaxy contains, the faster the orbits have to be. If the orbit is not fast enough, the orbital radius will decrease in the same way as artificial satellites orbiting th ...
Lec10
... — Use orbital properties of companion — Measure velocity and distance of orbiting gas It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun) ...
... — Use orbital properties of companion — Measure velocity and distance of orbiting gas It’s a black hole if it’s not a star and its mass exceeds the neutron star limit (~3 MSun) ...
Interpretation of the Helix Planetary Nebula using Hydro
... From the HST/ACS images of the Tadpole merger, the inner halo is baryonic and homogeneous except for dark-dwarf-galaxy PGC clusters. Its large 130 kpc radius (R = 4 × 1021 m) is revealed by young-globular-clusters (YGCs) and stars triggered into formation by tidal forces and radiation from the mergi ...
... From the HST/ACS images of the Tadpole merger, the inner halo is baryonic and homogeneous except for dark-dwarf-galaxy PGC clusters. Its large 130 kpc radius (R = 4 × 1021 m) is revealed by young-globular-clusters (YGCs) and stars triggered into formation by tidal forces and radiation from the mergi ...
What does X-ray light show us?
... Gamma-ray astronomy presents unique opportunities to explore these exotic objects. By exploring the universe at these high energies, scientists can search for new physics, testing theories and performing experiments which are not possible in earthbound laboratories. ...
... Gamma-ray astronomy presents unique opportunities to explore these exotic objects. By exploring the universe at these high energies, scientists can search for new physics, testing theories and performing experiments which are not possible in earthbound laboratories. ...
Astronomy - Dalriada at dalriada.org.uk
... the naked eye in the night sky, a stellar ‘nursery’ where stars are formed from the nebula’s gas. The Horsehead Nebula comprises clouds of interstellar dust which block light from a bright nebula behind. Nebulae may be visible by emission (e.g. Great Orion), reflection, or occlusion (e.g. Horsehead) ...
... the naked eye in the night sky, a stellar ‘nursery’ where stars are formed from the nebula’s gas. The Horsehead Nebula comprises clouds of interstellar dust which block light from a bright nebula behind. Nebulae may be visible by emission (e.g. Great Orion), reflection, or occlusion (e.g. Horsehead) ...
PPS
... incoming light into its rainbow pattern - a technique which goes right back to Isaac Newton's discovery that light can be split into its component colours in this way. The spectrum can then be photographed and studied in detail. The positions and strengths of the lines in the spectrum can also be de ...
... incoming light into its rainbow pattern - a technique which goes right back to Isaac Newton's discovery that light can be split into its component colours in this way. The spectrum can then be photographed and studied in detail. The positions and strengths of the lines in the spectrum can also be de ...
Today`s Powerpoint
... 2. If you are in freefall, you are also weightless. Einstein says these are equivalent. So in freefall, the light and the ball also travel in straight lines. 3. Now imagine two people in freefall on Earth, passing a ball back and forth. From their perspective, they pass the ball in a straight line. ...
... 2. If you are in freefall, you are also weightless. Einstein says these are equivalent. So in freefall, the light and the ball also travel in straight lines. 3. Now imagine two people in freefall on Earth, passing a ball back and forth. From their perspective, they pass the ball in a straight line. ...
The Origin of the Solar System and Other Planetary Systems
... breaking from a strong solar wind can be found in T Tauri stars which are in a highly active phase of their evolution and have strong stellar winds. Besides being a source of magnetic braking, these winds also sweep away the gas disk, leaving the planetesimals and gas giants. ...
... breaking from a strong solar wind can be found in T Tauri stars which are in a highly active phase of their evolution and have strong stellar winds. Besides being a source of magnetic braking, these winds also sweep away the gas disk, leaving the planetesimals and gas giants. ...
Power Point Presentation
... Universe has collapsed due to a slightly higher density of dark matter. It forms a 100 million solar mass protogalaxy, and at the center of this protogalaxy, a star is born! Density movie ...
... Universe has collapsed due to a slightly higher density of dark matter. It forms a 100 million solar mass protogalaxy, and at the center of this protogalaxy, a star is born! Density movie ...
ph507lecnote06
... In purely astronomical terms, the optical portion of the spectrum is important because most stars and galaxies emit a significant fraction of their energy in this part of the spectrum. (This is not true for objects significantly colder than stars e.g. planets, interstellar dust and molecular clouds, ...
... In purely astronomical terms, the optical portion of the spectrum is important because most stars and galaxies emit a significant fraction of their energy in this part of the spectrum. (This is not true for objects significantly colder than stars e.g. planets, interstellar dust and molecular clouds, ...
Star formation
Star formation is the process by which dense regions within molecular clouds in interstellar space, sometimes referred to as ""stellar nurseries"" or ""star-forming regions"", collapse to form stars. As a branch of astronomy, star formation includes the study of the interstellar medium (ISM) and giant molecular clouds (GMC) as precursors to the star formation process, and the study of protostars and young stellar objects as its immediate products. It is closely related to planet formation, another branch of astronomy. Star formation theory, as well as accounting for the formation of a single star, must also account for the statistics of binary stars and the initial mass function.In June 2015, astronomers reported evidence for Population III stars in the Cosmos Redshift 7 galaxy at z = 6.60. Such stars are likely to have existed in the very early universe (i.e., at high redshift), and may have started the production of chemical elements heavier than hydrogen that are needed for the later formation of planets and life as we know it.