Active Galactic Nuclei: are they important?
... •Massive central black holes are in all galaxies •In most galaxies the activity is low (e.g. Sgr A* in the Milky Way) but there is no strict border between AGN and non-active galaxies •Thus again BH and galaxies likely evolve ...
... •Massive central black holes are in all galaxies •In most galaxies the activity is low (e.g. Sgr A* in the Milky Way) but there is no strict border between AGN and non-active galaxies •Thus again BH and galaxies likely evolve ...
Presidential
... intimately related to the Measurements on Exploding Stars, far away in Cosmos. This is linked to a great mystery in Cosmology Today, which is the possible Presence of a Dark Energy in the Universe. In Supernovae, the core collapses in less than a Second, causing a Massive Explosion. A shock wave the ...
... intimately related to the Measurements on Exploding Stars, far away in Cosmos. This is linked to a great mystery in Cosmology Today, which is the possible Presence of a Dark Energy in the Universe. In Supernovae, the core collapses in less than a Second, causing a Massive Explosion. A shock wave the ...
Supplementary Information
... angle of the major axis (24 west of north) by searching for the largest amplitude in mean velocity along slits passing through the nominal continuum centre position. We then varied inclination, total mass, radial and z-scale lengths to reach minimum 2 with respect to the observed one dimensional ...
... angle of the major axis (24 west of north) by searching for the largest amplitude in mean velocity along slits passing through the nominal continuum centre position. We then varied inclination, total mass, radial and z-scale lengths to reach minimum 2 with respect to the observed one dimensional ...
The Extragalactic Distance Database: Color–Magnitude Diagrams
... star’s position on the image, and its apparent magnitude in both flight and groundbased filters, as well as several characterizations of the quality of the measurement. If there are several images per filter available then these values are displayed for each individual image as well as in combinatio ...
... star’s position on the image, and its apparent magnitude in both flight and groundbased filters, as well as several characterizations of the quality of the measurement. If there are several images per filter available then these values are displayed for each individual image as well as in combinatio ...
astro-ph/0504597 PDF
... heavier than iron. Fusing iron doesn’t release energy, instead it uses up energy! Thus, as no more nuclear fusion is possible, a core of iron builds up in the centers of massive supergiants. Eventually, the iron core reaches something called the Chandrasekhar Mass, which is about 1.4 times the mass ...
... heavier than iron. Fusing iron doesn’t release energy, instead it uses up energy! Thus, as no more nuclear fusion is possible, a core of iron builds up in the centers of massive supergiants. Eventually, the iron core reaches something called the Chandrasekhar Mass, which is about 1.4 times the mass ...
normal and active - FirstLight Astro
... ✴ what is this dark matter? ✴ dunno! ✴ neutrinos might play some role (?) ✴ whatever it is, dark matter does play a MAJOR role in the future of our universe, whatever it is ...
... ✴ what is this dark matter? ✴ dunno! ✴ neutrinos might play some role (?) ✴ whatever it is, dark matter does play a MAJOR role in the future of our universe, whatever it is ...
After School Guide to Ology Astronomy
... Big Bang – An incredibly huge explosion that was the beginning of everything — time, space, and matter — and which occurred at some time between 13 and 14 billion years ago. According to current theory, the Big Bang launched the ongoing expansion of the universe. black hole – A region in space where ...
... Big Bang – An incredibly huge explosion that was the beginning of everything — time, space, and matter — and which occurred at some time between 13 and 14 billion years ago. According to current theory, the Big Bang launched the ongoing expansion of the universe. black hole – A region in space where ...
Our Place in a Vast Universe
... explain the departures from the overall approximate homogeneity and isotropy that it successfully explained, it was a bonus that with a simple starting point, inflation could partially explain the observed inhomogeneities and anisotropies of our universe, which of course are essential for our existe ...
... explain the departures from the overall approximate homogeneity and isotropy that it successfully explained, it was a bonus that with a simple starting point, inflation could partially explain the observed inhomogeneities and anisotropies of our universe, which of course are essential for our existe ...
the gravity theory on a background of the lobachevsky geometry
... = k −1 coth = Γ̆221 , Γ̆233 = − sin θ cos θ, k ρ = k −1 coth = Γ̆331 , Γ̆323 = cot θ = Γ̆332 , k ...
... = k −1 coth = Γ̆221 , Γ̆233 = − sin θ cos θ, k ρ = k −1 coth = Γ̆331 , Γ̆323 = cot θ = Γ̆332 , k ...
Astronomy and the Bible
... The popular theory is that stars form from vast clouds of gas and dust through gravitational contraction. Because of heat pressure gas and dust clouds will expand, NOT contract. “The complete birth of a star has never been observed. The principles of physics demand some special conditions for st ...
... The popular theory is that stars form from vast clouds of gas and dust through gravitational contraction. Because of heat pressure gas and dust clouds will expand, NOT contract. “The complete birth of a star has never been observed. The principles of physics demand some special conditions for st ...
Exploring Space—The Universe: The Vast
... 1. Before viewing the video, ask students what interests them most about the universe. Is it the enormous distances? The idea of planets and galaxies far different than our own? Do they believe that there is life in other parts of the universe? Do they believe that our country and other nations shou ...
... 1. Before viewing the video, ask students what interests them most about the universe. Is it the enormous distances? The idea of planets and galaxies far different than our own? Do they believe that there is life in other parts of the universe? Do they believe that our country and other nations shou ...
Article #1- How the Big Bang Theory Works
... anti-particles annihilated each other, some particles survived. These particles would later combine to form all the matter in the universe. A period of particle cosmology followed the quantum age. This period starts at t = 1 x 10-11 seconds. This is a phase that scientists can recreate in lab condit ...
... anti-particles annihilated each other, some particles survived. These particles would later combine to form all the matter in the universe. A period of particle cosmology followed the quantum age. This period starts at t = 1 x 10-11 seconds. This is a phase that scientists can recreate in lab condit ...
A Closer Earth and the Faint Young Sun Paradox
... Although such a figure is roughly of the same order of magnitude of the value of the Hubble parameter 3.8 Ga ago HAr = 1.192H0 = 8.2 × 10−11 a−1 , standard general relativity rules out cosmological explanations for the hypothesized Earth’s recession rate. Instead, a class of modified theories of gra ...
... Although such a figure is roughly of the same order of magnitude of the value of the Hubble parameter 3.8 Ga ago HAr = 1.192H0 = 8.2 × 10−11 a−1 , standard general relativity rules out cosmological explanations for the hypothesized Earth’s recession rate. Instead, a class of modified theories of gra ...
Formation of Globular Clusters: In and Out of Dwarf Galaxies
... progenitor galaxies at intermediate redshifts • Model explains observed sizes, masses, ages, metallicities • Dynamical evolution explains the present mass function and may be important for metallicity bimodality • Red clusters in the Galaxy are due to massive late gas-rich ...
... progenitor galaxies at intermediate redshifts • Model explains observed sizes, masses, ages, metallicities • Dynamical evolution explains the present mass function and may be important for metallicity bimodality • Red clusters in the Galaxy are due to massive late gas-rich ...
Equipartition magnetic fields in normal galaxies
... Abstract. We studied the total magnetic field strength in normal starforming galaxies estimated using energy equipartition assumption. Using the well known radio–far infrared correlation we demonstrate that the equipartition assumption is valid in galaxies at sub-kpc scales. We find that the magneti ...
... Abstract. We studied the total magnetic field strength in normal starforming galaxies estimated using energy equipartition assumption. Using the well known radio–far infrared correlation we demonstrate that the equipartition assumption is valid in galaxies at sub-kpc scales. We find that the magneti ...
solar.gmu.edu
... Quasars: Luminous Objects •A quasar’s luminosity can be calculated from its apparent brightness and the distance using the inverse-square law •Even though small, the luminosity of a quasar (1038 to 1042 Watts) can be very larger, i.e., several thousand times more than the entire Milly Way Galaxies ...
... Quasars: Luminous Objects •A quasar’s luminosity can be calculated from its apparent brightness and the distance using the inverse-square law •Even though small, the luminosity of a quasar (1038 to 1042 Watts) can be very larger, i.e., several thousand times more than the entire Milly Way Galaxies ...
15 May 2011 Gas Giants, (Rigel, Betelgeuse, Aldebaran etc
... masses commonly called gas giants an unusual feature came to my attention, since the reported mass values of these stars were suspiciously very low when compared to the amounts of energy coming out of them. Presently, the evaluation of some physical data regarding stellar objects depends from the in ...
... masses commonly called gas giants an unusual feature came to my attention, since the reported mass values of these stars were suspiciously very low when compared to the amounts of energy coming out of them. Presently, the evaluation of some physical data regarding stellar objects depends from the in ...
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.