The density of very massive evolved galaxies to z≃ 1.7
... of the seven galaxies are shown. The spectra drops very rapidly at ∼0.9–1 µm concurrent with the 4000 Å break placing the galaxies at z > 1.3 and suggesting an early-type spectral nature. We searched for the best-fitting template by comparing the observed spectral energy distribution (SED) of each g ...
... of the seven galaxies are shown. The spectra drops very rapidly at ∼0.9–1 µm concurrent with the 4000 Å break placing the galaxies at z > 1.3 and suggesting an early-type spectral nature. We searched for the best-fitting template by comparing the observed spectral energy distribution (SED) of each g ...
PH607 – Galaxies
... This cluster is loaded with gas and dust rich, star forming, spiral galaxies but has relatively few elliptical galaxies, which lack gas and dust and the associated newborn stars. Colours in the composite image show the star forming galaxies with a blue tint and ellipticals with a slightly yellowish ...
... This cluster is loaded with gas and dust rich, star forming, spiral galaxies but has relatively few elliptical galaxies, which lack gas and dust and the associated newborn stars. Colours in the composite image show the star forming galaxies with a blue tint and ellipticals with a slightly yellowish ...
Cosmos
... who believes he has discovered (a) that neutrinos exist in three different states, only one of which could be detected by neutrino telescopes studying the Sun; and (b) that neutrinos unlike light - have mass, so that the gravity of all the neutrinos in space may help to close the Cosmos and prevent ...
... who believes he has discovered (a) that neutrinos exist in three different states, only one of which could be detected by neutrino telescopes studying the Sun; and (b) that neutrinos unlike light - have mass, so that the gravity of all the neutrinos in space may help to close the Cosmos and prevent ...
PH607lec11
... This cluster is loaded with gas and dust rich, star forming, spiral galaxies but has relatively few elliptical galaxies, which lack gas and dust and the associated newborn stars. Colours in the composite image show the star forming galaxies with a blue tint and ellipticals with a slightly yellowish ...
... This cluster is loaded with gas and dust rich, star forming, spiral galaxies but has relatively few elliptical galaxies, which lack gas and dust and the associated newborn stars. Colours in the composite image show the star forming galaxies with a blue tint and ellipticals with a slightly yellowish ...
Missions
... the Sun allowed different levels of heat to pass. He performed a simple experiment to study the “heating powers of coloured rays”: he split the sunlight with a glass prism into its different constituent rainbow colours and measured the temperature of each colour. He observed an increase in temperatu ...
... the Sun allowed different levels of heat to pass. He performed a simple experiment to study the “heating powers of coloured rays”: he split the sunlight with a glass prism into its different constituent rainbow colours and measured the temperature of each colour. He observed an increase in temperatu ...
1 Cosmology: a brief refresher course
... to form heavier nuclei, they cannot immediately do so, as immediately after freeze-out there are still too many extremely high energy photons around, and these photodisintegrate any heavy nuclei that form. As the Universe expands and cools, however, the number density of these photons falls off expo ...
... to form heavier nuclei, they cannot immediately do so, as immediately after freeze-out there are still too many extremely high energy photons around, and these photodisintegrate any heavy nuclei that form. As the Universe expands and cools, however, the number density of these photons falls off expo ...
A New Science Strategy for Space Astronomy and Astrophysics
... this field, the report identified in priority order the most important scientific programs and projects for both groundand space-based research. It recommended a single large initiative for space, the Space Infrared Telescope Facility, which now appears to be getting under way, albeit on a smaller s ...
... this field, the report identified in priority order the most important scientific programs and projects for both groundand space-based research. It recommended a single large initiative for space, the Space Infrared Telescope Facility, which now appears to be getting under way, albeit on a smaller s ...
ESA BR-170 - ESA Science
... is just one of the two hundred billion stars that form the Milky Way galaxy, and that there are many more galaxies in the Universe. Powerful telescopes can now look out to frontiers as remote as ten billion lightyears from Earth. Although the observable Universe has become very large indeed, astrono ...
... is just one of the two hundred billion stars that form the Milky Way galaxy, and that there are many more galaxies in the Universe. Powerful telescopes can now look out to frontiers as remote as ten billion lightyears from Earth. Although the observable Universe has become very large indeed, astrono ...
NASA-TV Highlights
... Tuesday, July 8 The Moon's latest daily shift eastward brings it left of Saturn and upper right of Antares at nightfall. Closer below the Moon are Beta and Delta Scorpii (as seen from North America). Wednesday, July 9 Can your scope separate a double star 1.0 arcsecond wide? High overhead, 44 Bootis ...
... Tuesday, July 8 The Moon's latest daily shift eastward brings it left of Saturn and upper right of Antares at nightfall. Closer below the Moon are Beta and Delta Scorpii (as seen from North America). Wednesday, July 9 Can your scope separate a double star 1.0 arcsecond wide? High overhead, 44 Bootis ...
Generation of Cosmological Perturbations by a First
... why the universe has attained the large scale inhomogeneities of matter distribution such as superclusters of galaxies. 9 ) This problem must be settled in order to complete a cosmological scenario based on GUTs. 10 ) A clue to approach this problem was obtained from the investigation into the space ...
... why the universe has attained the large scale inhomogeneities of matter distribution such as superclusters of galaxies. 9 ) This problem must be settled in order to complete a cosmological scenario based on GUTs. 10 ) A clue to approach this problem was obtained from the investigation into the space ...
Periodic Universal Gravitation Resulting in the Phenomenon of Dark
... first half of period of cosmic life, space expands from the big bang to the maximum. In the later half of cosmic life, cosmic contraction occurs. Energy provided by periodic gravitation is the energy behind cosmic expansion or contraction. Such energy stops being an unknown dark energy once it is id ...
... first half of period of cosmic life, space expands from the big bang to the maximum. In the later half of cosmic life, cosmic contraction occurs. Energy provided by periodic gravitation is the energy behind cosmic expansion or contraction. Such energy stops being an unknown dark energy once it is id ...
Lower Atmospheric Physics - National Open University of Nigeria
... The knowledge you gained in your study of gas laws shall now be extended to atmospheric gases. The atmosphere itself is a relatively thin gaseous envelop that surrounds the earth. It provides the air we breathe and protects us against some harmful radiations from the sun. You certainly know the stat ...
... The knowledge you gained in your study of gas laws shall now be extended to atmospheric gases. The atmosphere itself is a relatively thin gaseous envelop that surrounds the earth. It provides the air we breathe and protects us against some harmful radiations from the sun. You certainly know the stat ...
rcw 49 at mid-infrared wavelengths: a glimpse from the
... nebula; the bottom panels are zoomed in by a factor of 2 centered on the W2 cluster. We assign blue to the shortest wavelength band, green to the intermediate band, and red to the longest wavelength band. The left panels are composites of the [3.6], [4.5], and [5.8] bands, and the right panels are c ...
... nebula; the bottom panels are zoomed in by a factor of 2 centered on the W2 cluster. We assign blue to the shortest wavelength band, green to the intermediate band, and red to the longest wavelength band. The left panels are composites of the [3.6], [4.5], and [5.8] bands, and the right panels are c ...
Galaxy Classification Much of modern extragalactic astronomy deals
... 5) There is very little cold interstellar medium in elliptical galaxies. However, there is x-ray gas at a temperature of about T ∼ 106 K. One can easily see where this gas comes from. The stars in an elliptical galaxy must be losing mass. If the stars are moving isotropically at σ ∼ 200 km s−1 , the ...
... 5) There is very little cold interstellar medium in elliptical galaxies. However, there is x-ray gas at a temperature of about T ∼ 106 K. One can easily see where this gas comes from. The stars in an elliptical galaxy must be losing mass. If the stars are moving isotropically at σ ∼ 200 km s−1 , the ...
Chapter 1: Introduction to Galaxies File - QMplus
... Spiral galaxies have much gas within their discs, plus some embedded dust, which amounts to 1-20% of their visible mass (the rest of the visible mass is stars). This gas shows active star formation. The discs contain stars having a range of ages as a result of this continuing star formation. Spiral ...
... Spiral galaxies have much gas within their discs, plus some embedded dust, which amounts to 1-20% of their visible mass (the rest of the visible mass is stars). This gas shows active star formation. The discs contain stars having a range of ages as a result of this continuing star formation. Spiral ...
Quasars
... Not all quasars emit strong radio waves → radio-loud quasars & radio-quiet quasars → alternate name for radio-quiet: Quasi-Stellar Objects (QSOs) The brightness of the nucleus and the distance mask the host galaxy ...
... Not all quasars emit strong radio waves → radio-loud quasars & radio-quiet quasars → alternate name for radio-quiet: Quasi-Stellar Objects (QSOs) The brightness of the nucleus and the distance mask the host galaxy ...
Hands-On Activities
... Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. Mercury: The innermost and smallest planet in the solar system (since Pluto was re-labeled as a dwarf planet), orbiting the Sun once every 88 days. meteor: The visible event that occur ...
... Roman god of war (the counterpart of the Greek Ares), on account of its blood red color as viewed in the night sky. Mercury: The innermost and smallest planet in the solar system (since Pluto was re-labeled as a dwarf planet), orbiting the Sun once every 88 days. meteor: The visible event that occur ...
Molecules Detected in Interstellar Space
... H2 , because of its symmetry, does not have an electric dipole moment, only weak electric quadrupole transitions between rotational or ro-vibrational levels can be observed. Therefore, low rotational transitions of the CO molecule, although about by 10-4 less abundant than H2 , have become the most ...
... H2 , because of its symmetry, does not have an electric dipole moment, only weak electric quadrupole transitions between rotational or ro-vibrational levels can be observed. Therefore, low rotational transitions of the CO molecule, although about by 10-4 less abundant than H2 , have become the most ...
Chapter 1 LONG-TERM VARIATIONS IN THE GALACTIC
... intended as a short background. Different processes are elaborated in subsequent chapters. In particular, many of the processes are notably more important on shorter scales, and deserve more elaborate attention. ...
... intended as a short background. Different processes are elaborated in subsequent chapters. In particular, many of the processes are notably more important on shorter scales, and deserve more elaborate attention. ...
Unsolved Mystery of Molecules Found in
... Over time, astronomers have been building up catalogs to show exactly which wavelengths are absorbed by all kinds of atoms and molecules. Each molecule has its own unique pattern, which can be used like a fingerprint: if a pattern found during an astronomical observation matches a pattern in one of ...
... Over time, astronomers have been building up catalogs to show exactly which wavelengths are absorbed by all kinds of atoms and molecules. Each molecule has its own unique pattern, which can be used like a fingerprint: if a pattern found during an astronomical observation matches a pattern in one of ...
Galaxies and Their Structure
... In 1914 Vesto Slipher (lived 1870--1963) announced his results from the spectra of over 40 spiral galaxies (at his time people thought the ``spiral nebulae'' were inside the Milky Way). He found that over 90% of the spectra showed redshifts which meant that they were moving away from us. Edwin Hubbl ...
... In 1914 Vesto Slipher (lived 1870--1963) announced his results from the spectra of over 40 spiral galaxies (at his time people thought the ``spiral nebulae'' were inside the Milky Way). He found that over 90% of the spectra showed redshifts which meant that they were moving away from us. Edwin Hubbl ...
Sample pages 1 PDF
... a very dense and very hot state, the Big Bang, expanding and cooling over time. Even today, echoes of the Big Bang can be observed, for example in the form of the cosmic microwave background radiation. Accurate observations of ...
... a very dense and very hot state, the Big Bang, expanding and cooling over time. Even today, echoes of the Big Bang can be observed, for example in the form of the cosmic microwave background radiation. Accurate observations of ...
Outer space
Outer space, or just space, is the void that exists between celestial bodies, including the Earth. It is not completely empty, but consists of a hard vacuum containing a low density of particles, predominantly a plasma of hydrogen and helium as well as electromagnetic radiation, magnetic fields, neutrinos, dust and cosmic rays. The baseline temperature, as set by the background radiation from the Big Bang, is 2.7 kelvin (K). Plasma with a number density of less than one hydrogen atom per cubic metre and a temperature of millions of kelvin in the space between galaxies accounts for most of the baryonic (ordinary) matter in outer space; local concentrations have condensed into stars and galaxies. In most galaxies, observations provide evidence that 90% of the mass is in an unknown form, called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. Data indicates that the majority of the mass-energy in the observable Universe is a poorly understood vacuum energy of space which astronomers label dark energy. Intergalactic space takes up most of the volume of the Universe, but even galaxies and star systems consist almost entirely of empty space.There is no firm boundary where space begins. However the Kármán line, at an altitude of 100 km (62 mi) above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. This treaty precludes any claims of national sovereignty and permits all states to freely explore outer space. Despite the drafting of UN resolutions for the peaceful uses of outer space, anti-satellite weapons have been tested in Earth orbit.Humans began the physical exploration of space during the 20th century with the advent of high-altitude balloon flights, followed by manned rocket launches. Earth orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961 and unmanned spacecraft have since reached all of the known planets in the Solar System. Due to the high cost of getting into space, manned spaceflight has been limited to low Earth orbit and the Moon.Outer space represents a challenging environment for human exploration because of the dual hazards of vacuum and radiation. Microgravity also has a negative effect on human physiology that causes both muscle atrophy and bone loss. In addition to these health and environmental issues, the economic cost of putting objects, including humans, into space is high.