Galaxies (Professor Powerpoint)
... Mergers can transform two spirals into an elliptical galaxy. Some astronomers think that galaxies are always born as spirals, and they can become ellipticals only via mergers. ...
... Mergers can transform two spirals into an elliptical galaxy. Some astronomers think that galaxies are always born as spirals, and they can become ellipticals only via mergers. ...
Lecture 12: Galaxy Evolution
... change seen out to z=1 except possible in the blue spheroids ! • More data needed subject rapidly advancing due to new Galaxies – AS 3011 technologies. ...
... change seen out to z=1 except possible in the blue spheroids ! • More data needed subject rapidly advancing due to new Galaxies – AS 3011 technologies. ...
DTU Chap 16 Galaxies v2
... According to the spiral density wave theory, spiral arms of grand-design galaxies are caused by density waves. The gravitational field of a spiral density wave compresses the interstellar clouds that pass through it, thereby triggering the formation of stars, including OB associations, which highlig ...
... According to the spiral density wave theory, spiral arms of grand-design galaxies are caused by density waves. The gravitational field of a spiral density wave compresses the interstellar clouds that pass through it, thereby triggering the formation of stars, including OB associations, which highlig ...
Dark Matter and Dark Energy
... in its name and it’s not well understood. This name can be applied to anything that addresses the fact that the expansion of the universe is accelerating. Universal expansion is an example of space-time curvature, so let’s start with that. ...
... in its name and it’s not well understood. This name can be applied to anything that addresses the fact that the expansion of the universe is accelerating. Universal expansion is an example of space-time curvature, so let’s start with that. ...
Quasars
... Quasars and QSOs Not all quasars emit strong radio waves → radio-loud quasars & radio-quiet quasars → alternate name for radio-quiet: Quasi-Stellar Objects (QSOs) The brightness of the nucleus and the distance mask the host galaxy → appear as point sources unless observed at very high angular resolu ...
... Quasars and QSOs Not all quasars emit strong radio waves → radio-loud quasars & radio-quiet quasars → alternate name for radio-quiet: Quasi-Stellar Objects (QSOs) The brightness of the nucleus and the distance mask the host galaxy → appear as point sources unless observed at very high angular resolu ...
Extragalactic Globular Cluster Systems
... CDM Universe. The upper panel Moore et al (2006) shows the density distribution at a redshift z = 12 from a region that will form a single galaxy at z = 0 (lower panel). The blue–pink colour scale shows ...
... CDM Universe. The upper panel Moore et al (2006) shows the density distribution at a redshift z = 12 from a region that will form a single galaxy at z = 0 (lower panel). The blue–pink colour scale shows ...
Fujihara09 - Cardiff Physics and Astronomy
... deterministic, but very complicated function. For example, the gravitationalwave field consisting of many overlapping periodic signals with arbitrary, but fixed, amplitudes and phases appears random. In principle, it is resolvable in components. A stochastic background signal can be intrinsically ra ...
... deterministic, but very complicated function. For example, the gravitationalwave field consisting of many overlapping periodic signals with arbitrary, but fixed, amplitudes and phases appears random. In principle, it is resolvable in components. A stochastic background signal can be intrinsically ra ...
Ch17_lecture
... • To use this method, one concentrates on some stars or gas on the outer fringes of the galaxy • The semimajor axis distance used in Kepler’s third law is simply half the galaxy’s pre-determined diameter • For the orbital period used in the third law, one uses Doppler analysis of the galaxy’s spectr ...
... • To use this method, one concentrates on some stars or gas on the outer fringes of the galaxy • The semimajor axis distance used in Kepler’s third law is simply half the galaxy’s pre-determined diameter • For the orbital period used in the third law, one uses Doppler analysis of the galaxy’s spectr ...
Indroduction
... The chemical and spectro-photometric aspect are investigated by means of the so-called Evolutionary Population Synthesis (EPS) originally due to Tinsley (1978) (see Tinsley (1980a), and Bruzual (1993) for review), and since then used by many authors (see below for complete referencing). The great ad ...
... The chemical and spectro-photometric aspect are investigated by means of the so-called Evolutionary Population Synthesis (EPS) originally due to Tinsley (1978) (see Tinsley (1980a), and Bruzual (1993) for review), and since then used by many authors (see below for complete referencing). The great ad ...
Massive quiescent galaxies at cosmic noon Robert Feldmann UC Berkeley
... Noon and dynamica galaxies over the past 10 Gyr. The uncerta rown in size by a factor of ALMA: 870μm + CO Extreme Star-bursts (SMGs) was determined from simulations~1.4that i rs (10 Gyr). A key test of Gyr and template mismatch. However, w ellarHighest kinematics of• one form of stars atnoise rates ...
... Noon and dynamica galaxies over the past 10 Gyr. The uncerta rown in size by a factor of ALMA: 870μm + CO Extreme Star-bursts (SMGs) was determined from simulations~1.4that i rs (10 Gyr). A key test of Gyr and template mismatch. However, w ellarHighest kinematics of• one form of stars atnoise rates ...
Recollapsing Universe
... constant’ (CC) as repulsive force in space-time to counteract attractive force of gravity (A fudge factor!) • Willem de Sitter (A, Dutch, 1917) solves GTR equations with no CC and low density of matter: showed universe must expand • Alexander Friedmann (M, Russian, 1920) solves GTR with no CC but ...
... constant’ (CC) as repulsive force in space-time to counteract attractive force of gravity (A fudge factor!) • Willem de Sitter (A, Dutch, 1917) solves GTR equations with no CC and low density of matter: showed universe must expand • Alexander Friedmann (M, Russian, 1920) solves GTR with no CC but ...
black holes are created when stars collapse and die from burning its
... • the core is extremely cold at absolute zero, and the more distance spread outward, the more hot it gets, reaching temperatures ranging in the hundreds of billions at some points • the atmosphere of galaxies is just clusters of gases, mostly hydrogen and helium, that are trapped in the gravitationa ...
... • the core is extremely cold at absolute zero, and the more distance spread outward, the more hot it gets, reaching temperatures ranging in the hundreds of billions at some points • the atmosphere of galaxies is just clusters of gases, mostly hydrogen and helium, that are trapped in the gravitationa ...
Weak gravitational lensing
While the presence of any mass bends the path of light passing near it, this effect rarely produces the giant arcs and multiple images associated with strong gravitational lensing. Most lines of sight in the universe are thoroughly in the weak lensing regime, in which the deflection is impossible to detect in a single background source. However, even in these cases, the presence of the foreground mass can be detected, by way of a systematic alignment of background sources around the lensing mass. Weak gravitational lensing is thus an intrinsically statistical measurement, but it provides a way to measure the masses of astronomical objects without requiring assumptions about their composition or dynamical state.