Lecture Thirteen (Powerpoint format) - Flash
... Major Astronomical News Item of the Week -Discovery of Gliese 581c Gliese 581c is the smallest extrasolar planet discovered to date, at about 5 times the mass of the Earth. It is believed based on models (not yet demonstrated by direct observation) that this could very well be a massive Earthli ...
... Major Astronomical News Item of the Week -Discovery of Gliese 581c Gliese 581c is the smallest extrasolar planet discovered to date, at about 5 times the mass of the Earth. It is believed based on models (not yet demonstrated by direct observation) that this could very well be a massive Earthli ...
– 1 – 1. Galaxy Observations 1.1.
... wide luminosity (i.e. mass) range with moderate resolution but high accuracy spectra. A fixed aperture size is used for each galaxy, corresponding to a fixed physical size for each of the two galaxy clusters. The Coma cluster of galaxies is the nearest virialized large cluster of galaxies with a wel ...
... wide luminosity (i.e. mass) range with moderate resolution but high accuracy spectra. A fixed aperture size is used for each galaxy, corresponding to a fixed physical size for each of the two galaxy clusters. The Coma cluster of galaxies is the nearest virialized large cluster of galaxies with a wel ...
lecture course
... gravitational lensing (both weak and strong) measurements. The existence of dark matter in a cosmological context comes from the consideration of a large number of datasets in conjunction with each other.for example, information comes from measurements of cosmic shear and the Lyman forest. Cosmologi ...
... gravitational lensing (both weak and strong) measurements. The existence of dark matter in a cosmological context comes from the consideration of a large number of datasets in conjunction with each other.for example, information comes from measurements of cosmic shear and the Lyman forest. Cosmologi ...
EarthComm_c1s3
... There are arguments against the steady-state theory. They include the discovery of the cosmic background radiation. As you read earlier, this radiation indicates that the universe did have a beginning. Just after the big bang, all that existed in the universe was energy. As the universe expanded, it ...
... There are arguments against the steady-state theory. They include the discovery of the cosmic background radiation. As you read earlier, this radiation indicates that the universe did have a beginning. Just after the big bang, all that existed in the universe was energy. As the universe expanded, it ...
class 1,S11
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
Astronomical Distance Ladder
... Fisher. It was shown that in disc galaxies the luminosity is related to the rotation velocity. For disc galaxies the luminosity is proportional to the size of the galaxy in other words L=c1 x R2. However, it is known that at a given distance R the velocity should be V2=GM/R, then solving for R gives ...
... Fisher. It was shown that in disc galaxies the luminosity is related to the rotation velocity. For disc galaxies the luminosity is proportional to the size of the galaxy in other words L=c1 x R2. However, it is known that at a given distance R the velocity should be V2=GM/R, then solving for R gives ...
Chemistry
... Energy comes to us from our sun and other stars in the form of electromagnetic energy. The visible portion of the total spectrum of energy received can be analyzed by using a spectroscope. Dark absorption lines can be observed which can be used to identify a star’s properties such as its composition ...
... Energy comes to us from our sun and other stars in the form of electromagnetic energy. The visible portion of the total spectrum of energy received can be analyzed by using a spectroscope. Dark absorption lines can be observed which can be used to identify a star’s properties such as its composition ...
Presentation for Bechtel Bettis 9_28_04
... To detect a spectral line is easy. To distinguish it from all of the other radiation a detector absorbs at the same time is hard! By mixing the RF signal with a reference provided by the experimenter, the “Local Oscillator”, the spectrum is downconverted and may be analyzed. ...
... To detect a spectral line is easy. To distinguish it from all of the other radiation a detector absorbs at the same time is hard! By mixing the RF signal with a reference provided by the experimenter, the “Local Oscillator”, the spectrum is downconverted and may be analyzed. ...
DTU_9e_ch18 - University of San Diego Home Pages
... This diagram shows why we only see part of the entire universe. As time passes, this volume grows, meaning that light from more distant galaxies reaches us. The farthest galaxies we see (inset) as they were within a few hundred million years after the Big Bang. These galaxies, formed at the same tim ...
... This diagram shows why we only see part of the entire universe. As time passes, this volume grows, meaning that light from more distant galaxies reaches us. The farthest galaxies we see (inset) as they were within a few hundred million years after the Big Bang. These galaxies, formed at the same tim ...
04 Astrophysics_-_lesson_4 cosmology
... origin and evolution of our universe. It postulates that 12 to 14 billion years ago, the portion of the universe we can see today was only a few millimetres across. It has since expanded from this hot dense state into the vast and much cooler cosmos we currently inhabit. We can see remnants of this ...
... origin and evolution of our universe. It postulates that 12 to 14 billion years ago, the portion of the universe we can see today was only a few millimetres across. It has since expanded from this hot dense state into the vast and much cooler cosmos we currently inhabit. We can see remnants of this ...
The Milky Way - Montgomery College
... Measuring the Mass of the Black Hole in the Center of the Milky Way By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to be ~ 2.6 million ...
... Measuring the Mass of the Black Hole in the Center of the Milky Way By following the orbits of individual stars near the center of the Milky Way, the mass of the central black hole could be determined to be ~ 2.6 million ...
Super Giant
... The two factors that determine the force of gravity are mass and distance. What relationship exists between the speed of the galaxies moving apart and their initial distance from one another? Name and DESCRIBE this law. The further away the galaxy is, the faster it is moving- Hubble’s Law Explain ho ...
... The two factors that determine the force of gravity are mass and distance. What relationship exists between the speed of the galaxies moving apart and their initial distance from one another? Name and DESCRIBE this law. The further away the galaxy is, the faster it is moving- Hubble’s Law Explain ho ...
Hidden57_rf
... of images using three different wavebands of light. Infrared data from the Spitzer Space Telescope are coloured red; visible data from the Hubble Space Telescope are yellow; and X-ray data from the Chandra X-ray Observatory are green and blue. Located 10,000 light-years away in the constellation Cas ...
... of images using three different wavebands of light. Infrared data from the Spitzer Space Telescope are coloured red; visible data from the Hubble Space Telescope are yellow; and X-ray data from the Chandra X-ray Observatory are green and blue. Located 10,000 light-years away in the constellation Cas ...
Considerations about LIRIS MOS observations
... The LIRIS field of view covers 4x4 arcmin2 with a pixel scale of 0.25”. The maximum number of slitlets is around 25. Observing technique: Given the high and variable sky emission contamination, observations in the near infrared range need frequent sampling of the sky emission. This is usually achiev ...
... The LIRIS field of view covers 4x4 arcmin2 with a pixel scale of 0.25”. The maximum number of slitlets is around 25. Observing technique: Given the high and variable sky emission contamination, observations in the near infrared range need frequent sampling of the sky emission. This is usually achiev ...
Stars, Galaxies, and the Universe Section 1 Section 1
... from Earth, is caused by the movement of Earth. • The stars seem as though they are moving counterclockwise around a central star called Polaris, the North Star. Polaris is almost directly above the North Pole, and thus the star does not appear to move much. • Earth’s revolution around the sun cause ...
... from Earth, is caused by the movement of Earth. • The stars seem as though they are moving counterclockwise around a central star called Polaris, the North Star. Polaris is almost directly above the North Pole, and thus the star does not appear to move much. • Earth’s revolution around the sun cause ...
Stars, Galaxies, and the Universe Section 1
... • big bang theory the theory that all matter and energy in the universe was compressed into an extremely small volume that 3 to 15 billion years ago exploded and began expanding in all directions • By the mid-20th century, almost all astronomers and cosmologists accepted the big bang theory. ...
... • big bang theory the theory that all matter and energy in the universe was compressed into an extremely small volume that 3 to 15 billion years ago exploded and began expanding in all directions • By the mid-20th century, almost all astronomers and cosmologists accepted the big bang theory. ...
γ The potential for intensity interferometry with -ray telescope arrays
... Abstract. Intensity interferometry exploits a quantum optical effect in order to measure objects with extremely small angular scales. The first experiment to use this technique was the Narrabri intensity interferometer, which was successfully used in the 1970s to measure 32 stellar diameters at opti ...
... Abstract. Intensity interferometry exploits a quantum optical effect in order to measure objects with extremely small angular scales. The first experiment to use this technique was the Narrabri intensity interferometer, which was successfully used in the 1970s to measure 32 stellar diameters at opti ...
2. The Three Pillars of the Big Bang Theory
... therefore, tell us what conditions were like on our planet when it was slightly over half of its present age. We astronomers, however, can look back in time and see objects as they looked long before the Earth or the Sun had even formed. There is a price we have to pay for this amazing view of the u ...
... therefore, tell us what conditions were like on our planet when it was slightly over half of its present age. We astronomers, however, can look back in time and see objects as they looked long before the Earth or the Sun had even formed. There is a price we have to pay for this amazing view of the u ...
class 1,F10
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
... —No, the observable portion of the universe is about 14 billion light-years in radius because the universe is about 14 billion years old. ALSO (not in Ch. 1 of the book), we can “see” only about 4% of the universe, 96% is made of “dark matter” and “dark energy”. ...
The Milky Way Galaxy
... Let’s start by studying a special galaxy, our own: The Milky Way The basic structures of the Milky Way Galaxy: bulge, disk, halo What happens inside the Milky Way: the-star-gas-star cycle The motions of the Milky Way: how they happen and where; What do they mean, and what they are useful for? The my ...
... Let’s start by studying a special galaxy, our own: The Milky Way The basic structures of the Milky Way Galaxy: bulge, disk, halo What happens inside the Milky Way: the-star-gas-star cycle The motions of the Milky Way: how they happen and where; What do they mean, and what they are useful for? The my ...
幻灯片 1
... Other physical factors for the period changes can be excluded This permits an observational test for the stellar evolution theory HADS are observationally favored large amplitude only a few excited modes ...
... Other physical factors for the period changes can be excluded This permits an observational test for the stellar evolution theory HADS are observationally favored large amplitude only a few excited modes ...
Hubble Deep Field
The Hubble Deep Field (HDF) is an image of a small region in the constellation Ursa Major, constructed from a series of observations by the Hubble Space Telescope. It covers an area 2.5 arcminutes across, about one 24-millionth of the whole sky, which is equivalent in angular size to a 65 mm tennis ball at a distance of 100 metres. The image was assembled from 342 separate exposures taken with the Space Telescope's Wide Field and Planetary Camera 2 over ten consecutive days between December 18 and December 28, 1995.The field is so small that only a few foreground stars in the Milky Way lie within it; thus, almost all of the 3,000 objects in the image are galaxies, some of which are among the youngest and most distant known. By revealing such large numbers of very young galaxies, the HDF has become a landmark image in the study of the early universe, with the associated scientific paper having received over 900 citations by the end of 2014.Three years after the HDF observations were taken, a region in the south celestial hemisphere was imaged in a similar way and named the Hubble Deep Field South. The similarities between the two regions strengthened the belief that the universe is uniform over large scales and that the Earth occupies a typical region in the Universe (the cosmological principle). A wider but shallower survey was also made as part of the Great Observatories Origins Deep Survey. In 2004 a deeper image, known as the Hubble Ultra-Deep Field (HUDF), was constructed from a few months of light exposure. The HUDF image was at the time the most sensitive astronomical image ever made at visible wavelengths, and it remained so until the Hubble Extreme Deep Field (XDF) was released in 2012.