Lecture 2
... Submillimeter Galaxies (SMGs) • The UV is heavily extincted • The light is absorbed by dust grains and reemitted at far-IR and submillimetre wavelengths • Most of the galaxy’s light can be emitted at >100m • These frequencies are difficult to observe due to atmospheric effects ...
... Submillimeter Galaxies (SMGs) • The UV is heavily extincted • The light is absorbed by dust grains and reemitted at far-IR and submillimetre wavelengths • Most of the galaxy’s light can be emitted at >100m • These frequencies are difficult to observe due to atmospheric effects ...
Chapter 10 Formation and evolution of the Local Group
... The orbits are traced from z = 1 (near each label) to their present position (black dots). The close passage of NGC 6822 is clearly indicated. The orbit of the Large Magellanic Cloud (LMC) is shown, but the Small Magellanic Cloud is excluded from the model since it may interacting with the LMC. Leo ...
... The orbits are traced from z = 1 (near each label) to their present position (black dots). The close passage of NGC 6822 is clearly indicated. The orbit of the Large Magellanic Cloud (LMC) is shown, but the Small Magellanic Cloud is excluded from the model since it may interacting with the LMC. Leo ...
Document
... • I will make hundreds of hours of new observations of M dwarfs to determine flare rates • I am creating model galaxy simulations to predict flare rates on a Galactic scale that includes spectral type and activity level. We can ‘observe’ this model to predict what LSST will see. ...
... • I will make hundreds of hours of new observations of M dwarfs to determine flare rates • I am creating model galaxy simulations to predict flare rates on a Galactic scale that includes spectral type and activity level. We can ‘observe’ this model to predict what LSST will see. ...
Lab 14 Galaxy Morphology
... appeared similar to comets, but did not move. Others of these nebulae were resolved into clusters of stars as bigger telescopes were constructed, and used to examine them. Some of these fuzzy nebulae, however, did not break-up into stars no matter how big a telescope was used to look at them. While ...
... appeared similar to comets, but did not move. Others of these nebulae were resolved into clusters of stars as bigger telescopes were constructed, and used to examine them. Some of these fuzzy nebulae, however, did not break-up into stars no matter how big a telescope was used to look at them. While ...
The science case for - Astrophysics
... of which we are made. Perhaps most exotic of all, some new force seems to be stretching space-time, accelerating the expansion of the Universe. The nature of this force, which controls the future of the Universe, remains quite unknown. Astronomy is a technology-enabled science: progress in astronom ...
... of which we are made. Perhaps most exotic of all, some new force seems to be stretching space-time, accelerating the expansion of the Universe. The nature of this force, which controls the future of the Universe, remains quite unknown. Astronomy is a technology-enabled science: progress in astronom ...
Stellar Populations of Dwarf Elliptical Galaxies: UBVRI Photometry
... of low luminosity galaxies. At the same time, Virgo is dynamically young (e.g., Tully & Shaya 1984) and contains several substructural units (Binggeli et al. 1987); thus, with a well selected sample it may be possible to study the evolution of dwarf elliptical galaxies within the cluster itself. Rec ...
... of low luminosity galaxies. At the same time, Virgo is dynamically young (e.g., Tully & Shaya 1984) and contains several substructural units (Binggeli et al. 1987); thus, with a well selected sample it may be possible to study the evolution of dwarf elliptical galaxies within the cluster itself. Rec ...
the structure of the local interstellar medium. v. electron densities
... of C ii and C ii . All these relevant spectra were scrutinized for signs of C ii absorption. We found only 13 sight lines that show LISM absorption in both transitions and list them in Table 1. The 100 pc distance limit is chosen to coincide with the approximate extent of the Local Bubble (Lalleme ...
... of C ii and C ii . All these relevant spectra were scrutinized for signs of C ii absorption. We found only 13 sight lines that show LISM absorption in both transitions and list them in Table 1. The 100 pc distance limit is chosen to coincide with the approximate extent of the Local Bubble (Lalleme ...
A Spectroscopically Confirmed Excess of 24 micron Sources in a
... confirms that it has a higher density of IR members compared to the cluster and includes bright IR sources (log(LIR )[erg s−1 ]> 45) not found in galaxy clusters at z . 0.35; and 3) there is a strong trend of decreasing 24µm fraction with increasing galaxy density, i.e. an infrared-density relation, ...
... confirms that it has a higher density of IR members compared to the cluster and includes bright IR sources (log(LIR )[erg s−1 ]> 45) not found in galaxy clusters at z . 0.35; and 3) there is a strong trend of decreasing 24µm fraction with increasing galaxy density, i.e. an infrared-density relation, ...
book_text4
... The Hubble Space Telescope has undoubtedly had a greater public impact than any other space astronomy mission ever. The images included in this beautiful volume are quite staggering in what they reveal about the Universe we live in and have already become part of our common scientific and cultural h ...
... The Hubble Space Telescope has undoubtedly had a greater public impact than any other space astronomy mission ever. The images included in this beautiful volume are quite staggering in what they reveal about the Universe we live in and have already become part of our common scientific and cultural h ...
Teaching Tips Table of Contents - Hubble Deep Field
... AMAZING SPACE: HUBBLE DEEP FIELD ACADEMY ...
... AMAZING SPACE: HUBBLE DEEP FIELD ACADEMY ...
GRB prompt emission
... GRB Environments II: Studying the environment using radio and optical observation of GRBs • Density profiles are different for different environments: massive stars will be enveloped by a wind profile. ...
... GRB Environments II: Studying the environment using radio and optical observation of GRBs • Density profiles are different for different environments: massive stars will be enveloped by a wind profile. ...
GRB prompt emission
... GRB Environments II: Studying the environment using radio and optical observation of GRBs • Density profiles are different for different environments: massive stars will be enveloped by a wind profile. ...
... GRB Environments II: Studying the environment using radio and optical observation of GRBs • Density profiles are different for different environments: massive stars will be enveloped by a wind profile. ...
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 ...
A Zoo of Galaxies - Cambridge University Press
... In his 1927 defence of the classification scheme, Hubble claimed to have examined “upward of a thousand galaxies” in its construction. However for true physical understanding of a galaxy, more than just an image is required – we also need an estimate of its distance in order to reveal its size and ma ...
... In his 1927 defence of the classification scheme, Hubble claimed to have examined “upward of a thousand galaxies” in its construction. However for true physical understanding of a galaxy, more than just an image is required – we also need an estimate of its distance in order to reveal its size and ma ...
– 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 ...
The cosmological significance of high
... dkpc is the distance to Complex H in kiloparsecs. A typical H II region of diameter 50 pc would subtend an angle of 6.′ 4 at the nominal distance of 27 kpc to Complex H, and would thus be resolved easily by MSX. Ultracompact H II regions (less than 2 pc in diameter), however, would show up as point ...
... dkpc is the distance to Complex H in kiloparsecs. A typical H II region of diameter 50 pc would subtend an angle of 6.′ 4 at the nominal distance of 27 kpc to Complex H, and would thus be resolved easily by MSX. Ultracompact H II regions (less than 2 pc in diameter), however, would show up as point ...
Galaxies - hwchemistry
... curvature of space. – The presence of mass actually distorts space-time around it. – That is what you feel as gravity. – Einstein predicted that a light beam traveling through a gravitational field would be deflected by the curvature of space-time, much as a golf ball is deflected as it rolls over a ...
... curvature of space. – The presence of mass actually distorts space-time around it. – That is what you feel as gravity. – Einstein predicted that a light beam traveling through a gravitational field would be deflected by the curvature of space-time, much as a golf ball is deflected as it rolls over a ...
Quantitative constraints on starburst cycles in galaxies with stellar
... energy distribution parameters at the present day. We generate all model libraries at metallicities of 0.5 solar and 0.25 solar, appropriate for galaxies with stellar masses in the range 108 to 1010 M⊙ (Tremonti et al 2004). A fixed Chabrier (2003) initial mass function (IMF) is adopted for all the ...
... energy distribution parameters at the present day. We generate all model libraries at metallicities of 0.5 solar and 0.25 solar, appropriate for galaxies with stellar masses in the range 108 to 1010 M⊙ (Tremonti et al 2004). A fixed Chabrier (2003) initial mass function (IMF) is adopted for all the ...
Lambda-CDM model
The ΛCDM (Lambda cold dark matter) or Lambda-CDM model is a parametrization of the Big Bang cosmological model in which the universe contains a cosmological constant, denoted by Lambda (Greek Λ), associated with dark energy, and cold dark matter (abbreviated CDM). It is frequently referred to as the standard model of Big Bang cosmology, because it is the simplest model that provides a reasonably good account of the following properties of the cosmos: the existence and structure of the cosmic microwave background the large-scale structure in the distribution of galaxies the abundances of hydrogen (including deuterium), helium, and lithium the accelerating expansion of the universe observed in the light from distant galaxies and supernovaeThe model assumes that general relativity is the correct theory of gravity on cosmological scales.It emerged in the late 1990s as a concordance cosmology, after a period of time when disparate observed properties of the universe appeared mutually inconsistent, and there was no consensus on the makeup of the energy density of the universe.The ΛCDM model can be extended by adding cosmological inflation, quintessence and other elements that are current areas of speculation and research in cosmology.Some alternative models challenge the assumptions of the ΛCDM model. Examples of these are modified Newtonian dynamics, modified gravity and theories of large-scale variations in the matter density of the universe.