MASSACHUSETTS INSTITUTE OF TECHNOLOGY Physics Department Physics 8.286: The Early Universe
... The correct answer was (vi), that tens of thousands of nearby stars have had their distances measured by parallax using the orbit of the Earth. The vast majority of these were measured by the Hipparcos satellite, launched in 1989. This was a very important achievement, because among other benefits i ...
... The correct answer was (vi), that tens of thousands of nearby stars have had their distances measured by parallax using the orbit of the Earth. The vast majority of these were measured by the Hipparcos satellite, launched in 1989. This was a very important achievement, because among other benefits i ...
ASPEN WORKSHOP 2003
... and 9 I dropouts but of course this is tricky based on only 1 band! Z assumed, modest decline in size: at 1500—1700Ang Petrosian radius (half light radius divided by 2.6), broadly centered on 1 Kpc, z evolution (from 2 to 1 arcsec) consistent with either –1 or –2/3 exponent; similar result with half ...
... and 9 I dropouts but of course this is tricky based on only 1 band! Z assumed, modest decline in size: at 1500—1700Ang Petrosian radius (half light radius divided by 2.6), broadly centered on 1 Kpc, z evolution (from 2 to 1 arcsec) consistent with either –1 or –2/3 exponent; similar result with half ...
The UKIRT Infrared Deep Sky Survey ZY JHK Photometric System
... low temperature brown dwarfs (Section 5.2.2) and the identification of quasars with redshifts beyond the current maximum reached by SDSS, z = 6.4 (Section 5.4). To enable such goals, a novel feature of UKIDSS is the extension of imaging observations to wavelengths shortward of 1.2 µm where the avail ...
... low temperature brown dwarfs (Section 5.2.2) and the identification of quasars with redshifts beyond the current maximum reached by SDSS, z = 6.4 (Section 5.4). To enable such goals, a novel feature of UKIDSS is the extension of imaging observations to wavelengths shortward of 1.2 µm where the avail ...
A catalogue of the Chandra Deep Field South with multi
... Fig. 1. COMBO-17 filter set: Total system efficiencies in the COMBO-17 bands. They include two telescope mirrors, the WFI instrument, CCD detector and an average La Silla atmosphere. Photometric calibrations of such datasets are best achieved with spectrophotometric standards inside the target field ...
... Fig. 1. COMBO-17 filter set: Total system efficiencies in the COMBO-17 bands. They include two telescope mirrors, the WFI instrument, CCD detector and an average La Silla atmosphere. Photometric calibrations of such datasets are best achieved with spectrophotometric standards inside the target field ...
Quiz 2 Lecture 12
... a. Ring galaxies can be produced by head-on collisions between galaxies. b. The ratio of the number of elliptical to spiral galaxies remains constant over time. c. The Magellanic Clouds may eventually be "cannibalized" by our Galaxy. d. The shape of a galaxy can be influenced by collision with anoth ...
... a. Ring galaxies can be produced by head-on collisions between galaxies. b. The ratio of the number of elliptical to spiral galaxies remains constant over time. c. The Magellanic Clouds may eventually be "cannibalized" by our Galaxy. d. The shape of a galaxy can be influenced by collision with anoth ...
Theory of Motion of Matter on the Formation of Galaxy and Star
... motion direction of dispersed matter and made it move towards nebula center. Energy change occurs between primordial galaxy nebula center high density nuclear zone and dispersed matter, producing numerous vortex type primordial stellar nebulas there. Primordial stellar nebulas have constituted primo ...
... motion direction of dispersed matter and made it move towards nebula center. Energy change occurs between primordial galaxy nebula center high density nuclear zone and dispersed matter, producing numerous vortex type primordial stellar nebulas there. Primordial stellar nebulas have constituted primo ...
The DRIFT Dark Matter Project - School of Physics and Astronomy
... was carried out within the School of Physics at The University of Edinburgh and the institutions of the DRIFT collaboration. Chapters 1 and 2 describe much of the background theory relevant to the field of research. A substantial contribution to the work described in Chapter 3 and onwards was made b ...
... was carried out within the School of Physics at The University of Edinburgh and the institutions of the DRIFT collaboration. Chapters 1 and 2 describe much of the background theory relevant to the field of research. A substantial contribution to the work described in Chapter 3 and onwards was made b ...
The Final Version of the White Paper is available.
... The characterization of exoplanets is one of the outstanding key science cases for HIRES. The focus will be on characterizing exo-planet atmospheres over a wide range of masses, from Neptune-like down to Earth-like including those in the habitable zones, in terms of chemical composition, stratificat ...
... The characterization of exoplanets is one of the outstanding key science cases for HIRES. The focus will be on characterizing exo-planet atmospheres over a wide range of masses, from Neptune-like down to Earth-like including those in the habitable zones, in terms of chemical composition, stratificat ...
Feedback in low-mass galaxies in the early Universe
... emission lines53, neutral gas probed by low ionization absorption lines14,50,54, and molecular gas observed at radio wavelengths13,55. These observations have revealed that the properties of outflows vary with galaxy mass, star-formation rate, and the surface density of star formation: more massive ...
... emission lines53, neutral gas probed by low ionization absorption lines14,50,54, and molecular gas observed at radio wavelengths13,55. These observations have revealed that the properties of outflows vary with galaxy mass, star-formation rate, and the surface density of star formation: more massive ...
The colour–magnitude relation of early
... on the star formation history of these galaxies, indicating an impressive degree of homogeneity in the formation process. The correlation is most naturally accounted for as a sequence of metal abundance, with the scatter being primarily driven by differences in galaxy age. This paradigm correctly pr ...
... on the star formation history of these galaxies, indicating an impressive degree of homogeneity in the formation process. The correlation is most naturally accounted for as a sequence of metal abundance, with the scatter being primarily driven by differences in galaxy age. This paradigm correctly pr ...
Lecture Outline and Specific Objectives
... • describe the models for the formation of galaxies Chapter 23 Dark Matter, Dark Energy, and the Fate of the Universe Text Sections: 23.1 – 23.3 Specific Objectives - after studying this chapter you should be able to: • explain what is meant by dark matter and dark energy • describe methods to deter ...
... • describe the models for the formation of galaxies Chapter 23 Dark Matter, Dark Energy, and the Fate of the Universe Text Sections: 23.1 – 23.3 Specific Objectives - after studying this chapter you should be able to: • explain what is meant by dark matter and dark energy • describe methods to deter ...
Lecture 3 - University of Washington
... • The measurements show that rotation curves are “flat” – they are not ap√ proching the vc(R) ∝ 1/ R behavior expected in the outer parts of disks • Therefore, there must be an invisible galaxy component that is capable of producing gravitational force • Earlier (1930’s) suggested by Fritz Zwicky, b ...
... • The measurements show that rotation curves are “flat” – they are not ap√ proching the vc(R) ∝ 1/ R behavior expected in the outer parts of disks • Therefore, there must be an invisible galaxy component that is capable of producing gravitational force • Earlier (1930’s) suggested by Fritz Zwicky, b ...
The Swift satellite lives up to its name, revealing cosmic
... prompt phase the canonical afterglow decays very steeply before flattening out to what is known as a plateau phase. The light curve then breaks to the steeper decay rate known from pre-Swift data and may steepen again at a day or so after the GRB began indicating the sideways spreading of the jet as ...
... prompt phase the canonical afterglow decays very steeply before flattening out to what is known as a plateau phase. The light curve then breaks to the steeper decay rate known from pre-Swift data and may steepen again at a day or so after the GRB began indicating the sideways spreading of the jet as ...
Active Galactic Nuclei
... • Assume Eddington limited accretion λ=1, efficiency η =10%: • M0 = 10 Mo --> 9x106 Mo after 6x108 years • Either lower efficiency, or larger start mass: • η = 0.09, M0 = 150 Mo --> M(z=7) = 6x108 Mo • But: accretion at the Eddington limit for 1 billion years? • Initial mass function unknown • Quasi ...
... • Assume Eddington limited accretion λ=1, efficiency η =10%: • M0 = 10 Mo --> 9x106 Mo after 6x108 years • Either lower efficiency, or larger start mass: • η = 0.09, M0 = 150 Mo --> M(z=7) = 6x108 Mo • But: accretion at the Eddington limit for 1 billion years? • Initial mass function unknown • Quasi ...
Content - Sedgefield Community College
... Describe how smoke alarm works using alpha Describe how thickness of paper is controlled by beta Describe how gamma is used in irradiating food, sterilising equipment and diagnosing and treating cancer. Describe the dangers of ionising radiation. Explain safety precautions of hospital workers. Descr ...
... Describe how smoke alarm works using alpha Describe how thickness of paper is controlled by beta Describe how gamma is used in irradiating food, sterilising equipment and diagnosing and treating cancer. Describe the dangers of ionising radiation. Explain safety precautions of hospital workers. Descr ...
Dark Weak Force and Condensed Matter Contents
... flux quanta mediating bound state interactions between particles become dark. One can assign to each interaction a field body (em, Z 0 , W , gluonic, gravitational) and p-adic prime and the value of Planck constant characterize the size of the particular field body. One might even think that particl ...
... flux quanta mediating bound state interactions between particles become dark. One can assign to each interaction a field body (em, Z 0 , W , gluonic, gravitational) and p-adic prime and the value of Planck constant characterize the size of the particular field body. One might even think that particl ...
GammaRay Bursts, the Strongest Explosions in the Universe.
... according to their duration (longer or shorter than 2 seconds). The bursts arrive from random directions in the sky and disappear. Present dedicated satellites searching for GRBs detect bursts at a rate of one per day. This can be translated to one burst per ...
... according to their duration (longer or shorter than 2 seconds). The bursts arrive from random directions in the sky and disappear. Present dedicated satellites searching for GRBs detect bursts at a rate of one per day. This can be translated to one burst per ...
Chap 16: Galaxies
... Dark Matter Adding “visible” mass in: • stars, • interstellar gas, • dust, …etc., we find that most of the mass is “invisible”! • The nature of this “dark matter” is not understood at this time. • Some ideas: brown dwarfs, small black holes, exotic elementary particles. ...
... Dark Matter Adding “visible” mass in: • stars, • interstellar gas, • dust, …etc., we find that most of the mass is “invisible”! • The nature of this “dark matter” is not understood at this time. • Some ideas: brown dwarfs, small black holes, exotic elementary particles. ...
Dr. Charles William Lucas
... the universal force law he has refined the ring model to describe the complete set of elementary particles, their decay schemes, reactions, and excited states by introducing the classical concept of stable elementary particles being composed of primary, secondary and tertiary level three dimensiona ...
... the universal force law he has refined the ring model to describe the complete set of elementary particles, their decay schemes, reactions, and excited states by introducing the classical concept of stable elementary particles being composed of primary, secondary and tertiary level three dimensiona ...
Project Description - SDSS-III
... The Sloan Digital Sky Survey (SDSS), both the original 5-year program and its ongoing 3year extension (SDSS-II), has made enormous contributions across a wide span of astronomical fields, including contributions to many of the discoveries mentioned above. Along the way it has exemplified a new mode ...
... The Sloan Digital Sky Survey (SDSS), both the original 5-year program and its ongoing 3year extension (SDSS-II), has made enormous contributions across a wide span of astronomical fields, including contributions to many of the discoveries mentioned above. Along the way it has exemplified a new mode ...
Prologue - LandSurvival.com
... insights into the nature of reality and our place within that reality. It is a paradigm of “initiation,” where one ceases to adhere to reductionist scientific ideals and instead becomes aware that a higher spiritual reality underlies all of physical existence as we know it. In this book, we hope to ...
... insights into the nature of reality and our place within that reality. It is a paradigm of “initiation,” where one ceases to adhere to reductionist scientific ideals and instead becomes aware that a higher spiritual reality underlies all of physical existence as we know it. In this book, we hope to ...
Book of Abstracts - University of Sheffield
... Overview and status of LUX-ZEPLIN . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Overview of Axion Searches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Overview of Dark Matter Searches with the Fermi-LAT . . . . . . . . . . . . . . . . . 31 PandaX-II 500kg Liquid Xenon D ...
... Overview and status of LUX-ZEPLIN . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Overview of Axion Searches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Overview of Dark Matter Searches with the Fermi-LAT . . . . . . . . . . . . . . . . . 31 PandaX-II 500kg Liquid Xenon D ...
Effective Operators for Dark Matter Detection
... measured with high accuracy as 125 GeV. The CDF and D0 collaborations at Tevatron [6] also found an excess in the data around this value. This historical event projected us in a new era of measurements with the Large Hadron Collider (LHC) experiment. The next step is to establish the exact nature of ...
... measured with high accuracy as 125 GeV. The CDF and D0 collaborations at Tevatron [6] also found an excess in the data around this value. This historical event projected us in a new era of measurements with the Large Hadron Collider (LHC) experiment. The next step is to establish the exact nature of ...
Non-standard cosmology
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.