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CH01.AST1001.S15.EDS
... Our Sun moves randomly relative to the other stars in the local solar neighborhood… • at typical relative speeds of more than 70,000 km/hr • but stars are so far away that we cannot easily notice their motion … and it orbits the galaxy every 230 million years. ...
... Our Sun moves randomly relative to the other stars in the local solar neighborhood… • at typical relative speeds of more than 70,000 km/hr • but stars are so far away that we cannot easily notice their motion … and it orbits the galaxy every 230 million years. ...
The Strikingly Uniform, Highly Turbulent Interstellar Medium of the
... ionized gas in the most luminous Hot DOGs, we were awarded 8.1h in bands 7 and 8 to study the red-shifted 157.7µm (2 P3/2 → 2 P1/2 ) fine-structure transition of ionized carbon, [C ii], and the underlying dust continuum emission in a sample of Hot DOGs spanning a range of redshifts and luminosities. ...
... ionized gas in the most luminous Hot DOGs, we were awarded 8.1h in bands 7 and 8 to study the red-shifted 157.7µm (2 P3/2 → 2 P1/2 ) fine-structure transition of ionized carbon, [C ii], and the underlying dust continuum emission in a sample of Hot DOGs spanning a range of redshifts and luminosities. ...
Breaks in gamma-ray spectra of distant blazars and transparency of
... the mean free path of TeV gamma rays to dozens of Megaparsecs. However, TeV photons from numerous more distant sources have been detected3 . This might be interpreted, in each particular case, in terms of hardening of the emitted spectrum caused by presently unknown mechanisms at work in the sources ...
... the mean free path of TeV gamma rays to dozens of Megaparsecs. However, TeV photons from numerous more distant sources have been detected3 . This might be interpreted, in each particular case, in terms of hardening of the emitted spectrum caused by presently unknown mechanisms at work in the sources ...
Slide 1
... • A "true" color image or photograph recreates what our eyes would see in visible light under natural conditions • To create a color image from data at other wavelengths, astronomers represent it in "false" colors • Three of grayscale images from different wavelengths may be mapped to red, green, an ...
... • A "true" color image or photograph recreates what our eyes would see in visible light under natural conditions • To create a color image from data at other wavelengths, astronomers represent it in "false" colors • Three of grayscale images from different wavelengths may be mapped to red, green, an ...
matter and dark energy Gravitational lensing: a unique probe of dark
... gravitational lensing? Zwicky was correct that galaxies and galaxy clusters serve as more probable lenses than individual stars, but even so three factors seriously limit the visibility of lensed images. Firstly, it is useful to introduce the concept of optical depth τ in considering the probability ...
... gravitational lensing? Zwicky was correct that galaxies and galaxy clusters serve as more probable lenses than individual stars, but even so three factors seriously limit the visibility of lensed images. Firstly, it is useful to introduce the concept of optical depth τ in considering the probability ...
Chapter-by-Chapter Guide
... A geocentric universe is one in which the Earth is assumed to be at the center of everything. In contrast, our current view of the universe suggests that Earth is a rather ordinary planet orbiting a rather ordinary star in an ordinary galaxy, and there is nothing “central” about Earth at all. The la ...
... A geocentric universe is one in which the Earth is assumed to be at the center of everything. In contrast, our current view of the universe suggests that Earth is a rather ordinary planet orbiting a rather ordinary star in an ordinary galaxy, and there is nothing “central” about Earth at all. The la ...
PH607lec12
... There appears to be very little recent star formation in these galaxies, nor is there strong evidence for recent ingestion of smaller, younger galaxies. By contrast, the smaller, fainter galaxies are significantly younger -- their stars were formed as little as four billion years ago. The results of ...
... There appears to be very little recent star formation in these galaxies, nor is there strong evidence for recent ingestion of smaller, younger galaxies. By contrast, the smaller, fainter galaxies are significantly younger -- their stars were formed as little as four billion years ago. The results of ...
DTU 8e Chap 17 Quasars and Other Active Galaxies
... a galaxy that is only 400 million lightyears away. This pattern is called an Einstein cross. The diffuse image at the center of the Einstein cross is the core of the intervening galaxy. The physical effect that creates these multiple images is the same as that seen for galaxies. ...
... a galaxy that is only 400 million lightyears away. This pattern is called an Einstein cross. The diffuse image at the center of the Einstein cross is the core of the intervening galaxy. The physical effect that creates these multiple images is the same as that seen for galaxies. ...
Stars and Galaxies
... Optical Telescopes There are two basic types of optical telescopes. One type uses only lenses to study light and the other uses lenses and mirrors. Optical telescopes collect visible light and produce magnified images of objects. Light is collected by an objective lens or mirror. Because starlight i ...
... Optical Telescopes There are two basic types of optical telescopes. One type uses only lenses to study light and the other uses lenses and mirrors. Optical telescopes collect visible light and produce magnified images of objects. Light is collected by an objective lens or mirror. Because starlight i ...
Vacuum Bubbles Nucleation and Dark Matter Production through
... [2]. Inflation requires the existence of dark matter and axions have long been candidates for cold dark matter. A further refinement of the standard models stems from a recent analysis of the cosmic microwave background [3] added to the data from high-redshift supernova observations [4]. Together, t ...
... [2]. Inflation requires the existence of dark matter and axions have long been candidates for cold dark matter. A further refinement of the standard models stems from a recent analysis of the cosmic microwave background [3] added to the data from high-redshift supernova observations [4]. Together, t ...
Searching for Dwarf Galaxies and Population III Star
... 1. By 2016, the James Webb Space Telescope will regularly deliver deep infrared images that reveal the most massive star-forming galaxies and proto-clusters of galaxies at z > 7. We will identify the most luminous at z ~ 7.7, where Lyman falls in an atmospheric window between night sky lines, and ...
... 1. By 2016, the James Webb Space Telescope will regularly deliver deep infrared images that reveal the most massive star-forming galaxies and proto-clusters of galaxies at z > 7. We will identify the most luminous at z ~ 7.7, where Lyman falls in an atmospheric window between night sky lines, and ...
Research proposal uploaded for ESO fellowship
... How is the star formation history of galaxies affected by supernovae feedback? Is this feedback powerful enough as to drive the global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat ...
... How is the star formation history of galaxies affected by supernovae feedback? Is this feedback powerful enough as to drive the global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat ...
Physics case for Antares+
... supernovae explosions, etc. The penetrating potential of neutrinos is important not only for extremely dense environments in which -rays are dramatically absorbed, but also moderately opaque sources from which we do see -rays, but after significant distortion due to internal and external absorptio ...
... supernovae explosions, etc. The penetrating potential of neutrinos is important not only for extremely dense environments in which -rays are dramatically absorbed, but also moderately opaque sources from which we do see -rays, but after significant distortion due to internal and external absorptio ...
The Origin of Life from Primordial Planets
... converted the H-He comets to a rapidly spinning carbon white dwarf. Evidence from new telescopes, and improved old telescopes, show the standard cosmological model ΛCDMHC requires major modification to include effects of modern fluid mechanics (Gibson 2009ab). Including viscosity, diffusivity and st ...
... converted the H-He comets to a rapidly spinning carbon white dwarf. Evidence from new telescopes, and improved old telescopes, show the standard cosmological model ΛCDMHC requires major modification to include effects of modern fluid mechanics (Gibson 2009ab). Including viscosity, diffusivity and st ...
Parallel Universes - MIT Kavli Institute for Astrophysics and Space
... planets. Yet disturbing questions remained about what happened in the very beginning. Did something appear from nothing? Where are all the superheavy particles known as magnetic monopoles that particle physics predicts should be created early on (the “monopole problem”)? Why is space so big, so old ...
... planets. Yet disturbing questions remained about what happened in the very beginning. Did something appear from nothing? Where are all the superheavy particles known as magnetic monopoles that particle physics predicts should be created early on (the “monopole problem”)? Why is space so big, so old ...
The Formation of Primordial Luminous Objects - SLAC
... Figure 1.5. Schematic evolution of the temperature of the Intergalactic Medium (IGM) as a function of redshift: after recombination and before thermal decoupling (at zCompton ), TIGM is locked to TCMBR and evolves as (1+z). After thermal decoupling TIGM is no more locked to the radiation temperature ...
... Figure 1.5. Schematic evolution of the temperature of the Intergalactic Medium (IGM) as a function of redshift: after recombination and before thermal decoupling (at zCompton ), TIGM is locked to TCMBR and evolves as (1+z). After thermal decoupling TIGM is no more locked to the radiation temperature ...
X-ray Astronomy and the search for Black Holes
... • Above about E~2 keV, there is a highly absorbed, hard component. – There is a clear detection of Fe K complex, indicating thin thermal origin – A single kT (~5 keV) fit would work – But the effective bandpass was narrow (E~2-10 keV) so only weak constraints can be placed on models – Reminescent of ...
... • Above about E~2 keV, there is a highly absorbed, hard component. – There is a clear detection of Fe K complex, indicating thin thermal origin – A single kT (~5 keV) fit would work – But the effective bandpass was narrow (E~2-10 keV) so only weak constraints can be placed on models – Reminescent of ...
A Modern View of the Universe
... years ago. We see more distant galaxies as they were even further in the past. Some of the galaxies in the Hubble Space Telescope photo that opens the chapter are billions of light-years away, meaning we see them as they were billions of years ago. It’s also amazing to realize that any “snapshot” of ...
... years ago. We see more distant galaxies as they were even further in the past. Some of the galaxies in the Hubble Space Telescope photo that opens the chapter are billions of light-years away, meaning we see them as they were billions of years ago. It’s also amazing to realize that any “snapshot” of ...
Parallel Universes
... planets. Yet disturbing questions remained about what happened in the very beginning. Did something appear from nothing? Where are all the superheavy particles known as magnetic monopoles that particle physics predicts should be created early on (the “monopole problem”)? Why is space so big, so old ...
... planets. Yet disturbing questions remained about what happened in the very beginning. Did something appear from nothing? Where are all the superheavy particles known as magnetic monopoles that particle physics predicts should be created early on (the “monopole problem”)? Why is space so big, so old ...
The Cosmos & the Bible
... Radio Background • It was predicted years in advance by George Gamow as a natural consequence of a 'BigBang' cosmology. • In such a scheme, it is the glow from the time when the universe became transparent, about 100,000 years after its creation. • Other cosmologies have no natural explanation for t ...
... Radio Background • It was predicted years in advance by George Gamow as a natural consequence of a 'BigBang' cosmology. • In such a scheme, it is the glow from the time when the universe became transparent, about 100,000 years after its creation. • Other cosmologies have no natural explanation for t ...
A100H–Exploring the Universe: Dark Matter, Dark Energy Martin D
... Either dark matter exists or our understanding of our gravity must be revised ...
... Either dark matter exists or our understanding of our gravity must be revised ...
Non-standard cosmology
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A non-standard cosmology is any physical cosmological model of the universe that has been, or still is, proposed as an alternative to the Big Bang model of standard physical cosmology. In the history of cosmology, various scientists and researchers have disputed parts or all of the Big Bang due to a rejection or addition of fundamental assumptions needed to develop a theoretical model of the universe. From the 1940s to the 1960s, the astrophysical community was equally divided between supporters of the Big Bang theory and supporters of a rival steady state universe. It was not until advances in observational cosmology in the late 1960s that the Big Bang would eventually become the dominant theory, and today there are few active researchers who dispute it.The term non-standard is applied to any cosmological theory that does not conform to the scientific consensus, but is not used in describing alternative models where no consensus has been reached, and is also used to describe theories that accept a ""big bang"" occurred but differ as to the detailed physics of the origin and evolution of the universe. Because the term depends on the prevailing consensus, the meaning of the term changes over time. For example, hot dark matter would not have been considered non-standard in 1990, but would be in 2010. Conversely, a non-zero cosmological constant resulting in an accelerating universe would have been considered non-standard in 1990, but is part of the standard cosmology in 2010.