The Formation of Population III Stars in Gas Accretion Stage: Effects
... 2003; Yoshida et al. 2006; Yoshida et al. 2008). Cosmological simulations have shown that the first collapsed objects had a baryonic mass of ∼ 103 − 104 M⊙ and a temperature of ∼ 200 − 300 K (e.g., Bromm et al. 2002). Until several years ago, it was thought that only a single massive star with a mass ...
... 2003; Yoshida et al. 2006; Yoshida et al. 2008). Cosmological simulations have shown that the first collapsed objects had a baryonic mass of ∼ 103 − 104 M⊙ and a temperature of ∼ 200 − 300 K (e.g., Bromm et al. 2002). Until several years ago, it was thought that only a single massive star with a mass ...
Formation of Molecular Clouds and Global Conditions for Star
... or the H2 to 13 CO abundance ratio, both of which can vary within and between clouds in response to local conditions of UV irradiance, density, temperature, and metallicity (Bolatto et al. 2013; Ripple et al. 2013). Millimeter wave interferometers can resolve large GMC complexes in nearby galaxies b ...
... or the H2 to 13 CO abundance ratio, both of which can vary within and between clouds in response to local conditions of UV irradiance, density, temperature, and metallicity (Bolatto et al. 2013; Ripple et al. 2013). Millimeter wave interferometers can resolve large GMC complexes in nearby galaxies b ...
Impact of Protostellar Outflow on Star Formation: Effects of Initial
... estimate the mass ejection rate from the host cloud or star formation efficiency, we need to calculate the evolution of the protostellar outflow from the prestellar core stage because a wide-opening-outflow appears before protostar formation. In addition to the wide-opening-angle outflow, well collimated ...
... estimate the mass ejection rate from the host cloud or star formation efficiency, we need to calculate the evolution of the protostellar outflow from the prestellar core stage because a wide-opening-outflow appears before protostar formation. In addition to the wide-opening-angle outflow, well collimated ...
Comet Ion Tails Purpose Introduction Materials
... APOD: 2009 December 16 - Comet Hyakutake Passes the Earth Explanation: In 1996, an unexpectedly bright comet passed by planet Earth. Discovered less than two months before, Comet C/1996 B2 Hyakutake came within only 1/10th of the Earth-Sun distance from the Earth in late March. At that time, Comet H ...
... APOD: 2009 December 16 - Comet Hyakutake Passes the Earth Explanation: In 1996, an unexpectedly bright comet passed by planet Earth. Discovered less than two months before, Comet C/1996 B2 Hyakutake came within only 1/10th of the Earth-Sun distance from the Earth in late March. At that time, Comet H ...
THE DEMOGRAPHICS OF LONG-PERIOD COMETS ABSTRACT
... of our sample due to failed follow-up. This is probably a conservative upper limit: most of these lost objects were most likely either not real to begin with or fastmoving objects only visible for a short window of time. Secondly, some comets might have been inactive at these large heliocentric dist ...
... of our sample due to failed follow-up. This is probably a conservative upper limit: most of these lost objects were most likely either not real to begin with or fastmoving objects only visible for a short window of time. Secondly, some comets might have been inactive at these large heliocentric dist ...
Polarimetry: a powerful diagnostic tool in astronomy
... show appreciable polarization. For example, synchrotron and cyclotron radiation produce linear and circular polarization respectively. However, it is the polarization produced by material around a star that perhaps provides most current interest. This could be from a protoplanetary disc or a debris ...
... show appreciable polarization. For example, synchrotron and cyclotron radiation produce linear and circular polarization respectively. However, it is the polarization produced by material around a star that perhaps provides most current interest. This could be from a protoplanetary disc or a debris ...
Dawes Review. The tidal downsizing hypothesis of planet formation
... Even further from the Sun, Saturn, Uranus and Neptune are expected to have even larger cores, which is consistent with Saturn’s core (constrained to weigh 5 − 20 MJ , see Helled & Guillot, 2013) most likely being heavier than Jupiter’s, and with Uranus and Neptune consisting mainly of their cores, s ...
... Even further from the Sun, Saturn, Uranus and Neptune are expected to have even larger cores, which is consistent with Saturn’s core (constrained to weigh 5 − 20 MJ , see Helled & Guillot, 2013) most likely being heavier than Jupiter’s, and with Uranus and Neptune consisting mainly of their cores, s ...
Studies of molecular clouds at the Galactic centre Roland Karlsson DECLINATION (B1950)
... +50 (GMC M-0.02-0.07) and +80 km s−1 clouds), and the circumnuclear disk (CND) which in fact is a collection of clumps in systematic rotation about the GC. The CND is likely to be replenished by the +20 km s−1 cloud via an object at the north tip of the +20 km s−1 cloud, the Southern streamer, and p ...
... +50 (GMC M-0.02-0.07) and +80 km s−1 clouds), and the circumnuclear disk (CND) which in fact is a collection of clumps in systematic rotation about the GC. The CND is likely to be replenished by the +20 km s−1 cloud via an object at the north tip of the +20 km s−1 cloud, the Southern streamer, and p ...
The Physics and Chemistry of Nebular Evolution
... can make up as much as 80% of the volume of a given meteorite. Chondrules are roughly millimeter-sized, igneous, ferromagnesium silicates that are considered to be evidence for transient heating events in the early solar system (Connolly et al., 2006). In addition to chondrules, refractory objects c ...
... can make up as much as 80% of the volume of a given meteorite. Chondrules are roughly millimeter-sized, igneous, ferromagnesium silicates that are considered to be evidence for transient heating events in the early solar system (Connolly et al., 2006). In addition to chondrules, refractory objects c ...
gerard peter kuiper - National Academy of Sciences
... least in outline; that it was identical to the general process of star formation, from slightly turbulent prestellar clouds upon contraction, with conservation of angular momentum. It followed that the Solar System was no more than an "unsuccessful" double star with the companion mass spread out rad ...
... least in outline; that it was identical to the general process of star formation, from slightly turbulent prestellar clouds upon contraction, with conservation of angular momentum. It followed that the Solar System was no more than an "unsuccessful" double star with the companion mass spread out rad ...
Brochure - Institut für Raumfahrtsysteme
... of sunlight by dust particles. The glow is concentrated in the ecliptic plane, thus, the zodiacal light appears only in the constellations that lie on the Sun’s apparent annual path. Although visible only in extremely dark areas away from moonlight and civil light pollution, its thermal emission is ...
... of sunlight by dust particles. The glow is concentrated in the ecliptic plane, thus, the zodiacal light appears only in the constellations that lie on the Sun’s apparent annual path. Although visible only in extremely dark areas away from moonlight and civil light pollution, its thermal emission is ...
teach with space
... to Earth. Analysis of this dust confirmed the presence of glycine, the simplest amino acid. This was monumentally important. Amino acids are the building blocks for proteins. As such, they are a major building block of life itself. To find these biological molecules (chemical formula C2H5NO2 ) on a ...
... to Earth. Analysis of this dust confirmed the presence of glycine, the simplest amino acid. This was monumentally important. Amino acids are the building blocks for proteins. As such, they are a major building block of life itself. To find these biological molecules (chemical formula C2H5NO2 ) on a ...
teach with space
... to Earth. Analysis of this dust confirmed the presence of glycine, the simplest amino acid. This was monumentally important. Amino acids are the building blocks for proteins. As such, they are a major building block of life itself. To find these biological molecules (chemical formula C2H5NO2 ) on a ...
... to Earth. Analysis of this dust confirmed the presence of glycine, the simplest amino acid. This was monumentally important. Amino acids are the building blocks for proteins. As such, they are a major building block of life itself. To find these biological molecules (chemical formula C2H5NO2 ) on a ...
SPICA Yellow Book
... A complete understanding of the formation and evolution of galaxies, stars and planets can only be reached through the investigation of the cold and obscured parts of the Universe, where the basic processes of formation and evolution occur. Deep exploration of the cold Universe using high spatial re ...
... A complete understanding of the formation and evolution of galaxies, stars and planets can only be reached through the investigation of the cold and obscured parts of the Universe, where the basic processes of formation and evolution occur. Deep exploration of the cold Universe using high spatial re ...
Astronomy and Astrophysics (ASTRO) Iowa State University – 2013-2014 1
... including the solar system, weather and climate, water and soils, plate tectonics, and geologic hazards. Must be taken concurrently with GEOL/ASTRO 106. ASTRO 120. The Sky and the Solar System. (3-0) Cr. 3. F.S.SS. For the nonscientist. The sky: constellations; motions of the sun, moon, and planets; ...
... including the solar system, weather and climate, water and soils, plate tectonics, and geologic hazards. Must be taken concurrently with GEOL/ASTRO 106. ASTRO 120. The Sky and the Solar System. (3-0) Cr. 3. F.S.SS. For the nonscientist. The sky: constellations; motions of the sun, moon, and planets; ...
Analysis of Stellar Activity and Orbital Dynamics in Extrasolar
... Nearly four centuries later, as- age can be estimated based on short26 tronomers are much closer to finding lived, extinct radionuclides like Al and ...
... Nearly four centuries later, as- age can be estimated based on short26 tronomers are much closer to finding lived, extinct radionuclides like Al and ...
PDF only - at www.arxiv.org.
... This document describes fundamental, yet still unresolved, astrophysical questions that can only be answered through a FIR space mission, and gives an overview of the technology required to answer them: essentially a “roadmap”. These queries regard: ...
... This document describes fundamental, yet still unresolved, astrophysical questions that can only be answered through a FIR space mission, and gives an overview of the technology required to answer them: essentially a “roadmap”. These queries regard: ...
Observations, Modeling and Theory of Debris Disks
... in thermal emission or scattered light. These disks may persist over Gyrs through steady-state evolution and/or may also experience sporadic stirring and major collisional breakups, rendering them atypically bright for brief periods of time. Most interestingly, they provide direct evidence that the ...
... in thermal emission or scattered light. These disks may persist over Gyrs through steady-state evolution and/or may also experience sporadic stirring and major collisional breakups, rendering them atypically bright for brief periods of time. Most interestingly, they provide direct evidence that the ...
Observations, Modeling and Theory of Debris Disks
... in thermal emission or scattered light. These disks may persist over Gyrs through steady-state evolution and/or may also experience sporadic stirring and major collisional breakups, rendering them atypically bright for brief periods of time. Most interestingly, they provide direct evidence that the ...
... in thermal emission or scattered light. These disks may persist over Gyrs through steady-state evolution and/or may also experience sporadic stirring and major collisional breakups, rendering them atypically bright for brief periods of time. Most interestingly, they provide direct evidence that the ...
Reassessing the formation of the inner Oort cloud
... either a Hernquist or Plummer potential – and chose other parameters based on the latest observations of embedded clusters from the literature. These other parameters result in the stars being on radial orbits and the cluster collapses. Similar to previous studies, in our simulations the inner Oort ...
... either a Hernquist or Plummer potential – and chose other parameters based on the latest observations of embedded clusters from the literature. These other parameters result in the stars being on radial orbits and the cluster collapses. Similar to previous studies, in our simulations the inner Oort ...
9 The Clearing of Protoplanetary Disks and of the Protosolar Nebula
... in low-density star-forming regions like Taurus. They also find that the disk frequency sharply decreases with cluster age suggesting a disk lifetime (the time for all stars to lose their disks) of 6 Myr (see the dot-dashed line in Fig. 9.2). The sensitivity of the IRAC camera on board the Spitzer S ...
... in low-density star-forming regions like Taurus. They also find that the disk frequency sharply decreases with cluster age suggesting a disk lifetime (the time for all stars to lose their disks) of 6 Myr (see the dot-dashed line in Fig. 9.2). The sensitivity of the IRAC camera on board the Spitzer S ...
ESA BR-170 - ESA Science
... In 1800, the German-born British astronomer and musician, William Herschel – famous for his discovery of the planet Uranus a few years earlier – described that the differently coloured filters through which he observed the Sun allowed different levels of heat to pass. He performed a simple experimen ...
... In 1800, the German-born British astronomer and musician, William Herschel – famous for his discovery of the planet Uranus a few years earlier – described that the differently coloured filters through which he observed the Sun allowed different levels of heat to pass. He performed a simple experimen ...
Intelligent Life in the Universe - e
... Jewish, and Germanic mythologies. Although no fossil traces of such beings have ever been found, most of us firmly believe that nonhuman intelligent beings do indeed exist. This conviction is derived from the staggering size of the universe with roughly 100 billion times 100 billion (1022 ) stars, wh ...
... Jewish, and Germanic mythologies. Although no fossil traces of such beings have ever been found, most of us firmly believe that nonhuman intelligent beings do indeed exist. This conviction is derived from the staggering size of the universe with roughly 100 billion times 100 billion (1022 ) stars, wh ...
Missions
... All types of light are ‘electromagnetic radiation’. Electromagnetic radiation propagates through space as a wave. Although this wave always travels at the same speed in a vacuum (the famous speed of light, 300 000 kilometres per second), some of its characteristics vary depending on its energy. Ultr ...
... All types of light are ‘electromagnetic radiation’. Electromagnetic radiation propagates through space as a wave. Although this wave always travels at the same speed in a vacuum (the famous speed of light, 300 000 kilometres per second), some of its characteristics vary depending on its energy. Ultr ...
High ions towards white dwarfs: circumstellar line shifts and stellar
... As previously found (e.g. Savage & Lehner 2006), for a fraction of the OVI detections the measured velocity is significantly shifted from the IS velocity (deduced from low ionization species), and another fraction of detections has no or negligible velocity shifts. In that work, the authors have als ...
... As previously found (e.g. Savage & Lehner 2006), for a fraction of the OVI detections the measured velocity is significantly shifted from the IS velocity (deduced from low ionization species), and another fraction of detections has no or negligible velocity shifts. In that work, the authors have als ...