c Copyright by Jonathan C. McKinney, 2004
... flow (McKinney and Gammie, 2002). The differences in their results were due to differences in their experimental designs. Seemingly small changes to the VHD model introduced nonnegligible changes to the results. This suggests that a self-consistent MHD, rather than phenomenological VHD, model for tu ...
... flow (McKinney and Gammie, 2002). The differences in their results were due to differences in their experimental designs. Seemingly small changes to the VHD model introduced nonnegligible changes to the results. This suggests that a self-consistent MHD, rather than phenomenological VHD, model for tu ...
... defined to be slow processes, i.e., ones that have timescales much longer than tdyn . To be interesting, they must operate over long times. Some secular processes, such as disk heating via stellar enounters with molecular clouds, are well known (Spitzer & Schwarzschild 1951, 1953). But star-star rel ...
The Evolution of Star Formation Activity in . Cory R. Wagner
... In this thesis, we explore 7.5 billion years of evolution in cluster galaxy star formation activity using a sample of 11 high-redshift (1 < z < 1.5) clusters from the IRAC Shallow Cluster Survey, and 25 low-redshift (0.15 < z < 1) clusters from The Cluster Lensing And Supernova survey with Hubble. W ...
... In this thesis, we explore 7.5 billion years of evolution in cluster galaxy star formation activity using a sample of 11 high-redshift (1 < z < 1.5) clusters from the IRAC Shallow Cluster Survey, and 25 low-redshift (0.15 < z < 1) clusters from The Cluster Lensing And Supernova survey with Hubble. W ...
The most metal-poor galaxies
... we can now try to compare different kinds of galaxies. One of the most fundamental parameters for a galaxy is of course its mass. This mass, which may consist of stars, gas, dust, baryonic- and non-baryonic dark matter, is more difficult to measure, than e.g. the luminosity, but to the first approxi ...
... we can now try to compare different kinds of galaxies. One of the most fundamental parameters for a galaxy is of course its mass. This mass, which may consist of stars, gas, dust, baryonic- and non-baryonic dark matter, is more difficult to measure, than e.g. the luminosity, but to the first approxi ...
Niraj D. Welikala Thesis - D-Scholarship@Pitt
... The role of star formation in galaxies is clearly a fundamental component of their evolution, although it is becoming clear that galaxy environments may also play a significant role. To explore the relationship between environment and star formation in galaxies, I use the photometric information con ...
... The role of star formation in galaxies is clearly a fundamental component of their evolution, although it is becoming clear that galaxy environments may also play a significant role. To explore the relationship between environment and star formation in galaxies, I use the photometric information con ...
IRAM Annual Report 2012
... of 140 AU. The continuum was detected at the 0.4mJy level and found consistent with emission originating from a region of cold gas and dust (≤10K) and of enhanced H2 column density (≥∙71022 cm-2). From this, the gas and dust mass of Oph B-11 was estimated to 0.02-0.03 M⊙. The linewidth of the N2H+(1 ...
... of 140 AU. The continuum was detected at the 0.4mJy level and found consistent with emission originating from a region of cold gas and dust (≤10K) and of enhanced H2 column density (≥∙71022 cm-2). From this, the gas and dust mass of Oph B-11 was estimated to 0.02-0.03 M⊙. The linewidth of the N2H+(1 ...
Galaxy Disks Further
... and gas content, such as HI content and integrated color (Roberts & Hayes 1994). These latter properties were convincingly interpreted as a measure of the process of depletion of the interstellar gas in star formation and the rate of current star formation relative to that averaged over a galaxy’s l ...
... and gas content, such as HI content and integrated color (Roberts & Hayes 1994). These latter properties were convincingly interpreted as a measure of the process of depletion of the interstellar gas in star formation and the rate of current star formation relative to that averaged over a galaxy’s l ...
A Teacher`s Guide to the Universe
... This page is a work in progress and from time to time pages may be under construction. In addition, since the page is still under construction your comments are appreciated (To respond see below). Also, please note that credit has been given where appropriate on page footnote.html and can be viewed ...
... This page is a work in progress and from time to time pages may be under construction. In addition, since the page is still under construction your comments are appreciated (To respond see below). Also, please note that credit has been given where appropriate on page footnote.html and can be viewed ...
Neutrino Astrophysics
... a neutron to a proton, with the emission of an electron and an electron antineutrino. Indeed, it was the apparent absence of energy conservation in nuclear β decay that first lead Wolfgang Pauli, more than 80 years ago, to suggest that some undetected neutral particle (the νe ) must be escaping from ...
... a neutron to a proton, with the emission of an electron and an electron antineutrino. Indeed, it was the apparent absence of energy conservation in nuclear β decay that first lead Wolfgang Pauli, more than 80 years ago, to suggest that some undetected neutral particle (the νe ) must be escaping from ...
environmental effects on galaxy evolution in nearby clusters
... attenuation in local and high redshift galaxies. (c) Investigation of the effect of large scale structures assembling on galaxy evolution through the dynamical analysis of Abell 1367, one of the best examples of a dynamically young local cluster of galaxies. (d) The characterization of the effects o ...
... attenuation in local and high redshift galaxies. (c) Investigation of the effect of large scale structures assembling on galaxy evolution through the dynamical analysis of Abell 1367, one of the best examples of a dynamically young local cluster of galaxies. (d) The characterization of the effects o ...
Circumstellar dust emission from nearby Solar
... emission of nearby Solar-type stars, and is partly involved with the Herschel key programme DUst around NEarby Stars (DUNES). It includes detailed studies on a few nearby stars, and results from a coherent re-reduction of the combined datasets of the original DUNES catalogue and 55 DEBRISobserved so ...
... emission of nearby Solar-type stars, and is partly involved with the Herschel key programme DUst around NEarby Stars (DUNES). It includes detailed studies on a few nearby stars, and results from a coherent re-reduction of the combined datasets of the original DUNES catalogue and 55 DEBRISobserved so ...
Where stars form: inside-out growth and coherent star formation from
... JF125W /HF140W /HF160W selected photometric catalogs (see Skelton et al. 2014). These photometric catalogs form the scaffolding of this project upon which all the remaining data products rest. For this study, we rely on the rest-frame colors, stellar masses, and star formation rates. All of these qu ...
... JF125W /HF140W /HF160W selected photometric catalogs (see Skelton et al. 2014). These photometric catalogs form the scaffolding of this project upon which all the remaining data products rest. For this study, we rely on the rest-frame colors, stellar masses, and star formation rates. All of these qu ...
ROSAT Ian R. Stevens* and David K. Strickland*
... and NGC 5408) and were detected (though the case is marginal for NGC 2366), while the other three were observed serendipitously and were not detected. A similar dichotomy was also found for the WR galaxies in SS98. WR galaxies are a subset of emission-line (EL) galaxies. Conti (1991) listed a small ...
... and NGC 5408) and were detected (though the case is marginal for NGC 2366), while the other three were observed serendipitously and were not detected. A similar dichotomy was also found for the WR galaxies in SS98. WR galaxies are a subset of emission-line (EL) galaxies. Conti (1991) listed a small ...
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.