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Le travail présenté consiste en l'élaboration de la courbe de rotation de la galaxie spirale NGC3198 à partir de son profil de luminosité. Pour ce faire, des images dans 14 bandes spectrales (allant de l'UV à l'IR lointain) ont été analysées en divisant la galaxie en anneaux concentriques, chacun se référant à une distance galactocentrique. Ces profils ont ensuite été corrigés de l'absorption par les poussières. Des spectres d'étoiles ont été ajustés afin d'obtenir le profil de masse stellaire de la galaxie. Le profil de masse de gaz a également été déterminé. Ces profils de masse ont été utilisés pour calculer la courbe de rotation en supposant une distribution de matière dans un disque (sauf pour le bulbe sphérique). La courbe de rotation ainsi obtenue a pu être comparée à celle observée et plusieurs hypothèses (halo de matière sombre, mauvaise estimation des distances) ont été envisagées pour expliquer les différences. The present work is consisting in the elaboration of the spiral galaxy NGC3198 rotation curve using it's luminosity profile. We used images in 14 spectral bands (from UV to far IR) to analyse them by dividing the galaxy in concentric annuli, each one at a different galactocentric distance. Those inferred luminosity profiles were corrected from the dust absorption. Stellar spectra were fitted in order to obtain the stellar mass profile. The mass profile of the gas was also determined. Those mass profiles were used to calculate the rotation curve assuming a disk-like matter distribution (except for the spherical bulge). This rotation curve was compared to the observed one and we looked into different hypotheses (dark matter halo, distances issues) in order to explain the differences between them.

Spiral galaxy --- NGC3198 --- Rotation curve --- galaxie spirale --- courbe de rotation --- Physique, chimie, mathématiques & sciences de la terre > Aérospatiale, astronomie & astrophysique

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This is a revealing account of the family life and achievements of the Third Earl of Rosse, a hereditary peer and resident landlord at Birr Castle, County Offaly, in nineteenth-century Ireland, before, during and after the devastating famine of the 1840s. He was a remarkable engineer, who built enormous telescopes in the cloudy middle of Ireland. The book gives details, in an attractive non-technical style which requires no previous scientific knowledge, of his engineering initiatives and the astronomical results, but also reveals much more about the man and his contributions - locally in the.

Astronomers. --- Physical scientists --- Rosse, William Parsons, --- Parsons, William, --- Rosse, --- Anglo-Irish community. --- Birr Castle. --- Countess of Rosse. --- Irish climate. --- Spiral Galaxy. --- William Parsons. --- architectural initiative. --- astronomy. --- engineering. --- resident landlord. --- scientific research. --- spiral nebulae. --- telescopes. --- the Leviathan.

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No detailed description available for "Heart of Darkness".

SCIENCE / Astronomy. --- Age of the universe. --- Astronomer. --- Astronomical object. --- Astronomy. --- Astrophysics. --- Atomic nucleus. --- Background radiation. --- Beatrice Tinsley. --- Big Bang. --- Calculation. --- Cepheid variable. --- Chemical element. --- Chronology of the universe. --- Cosmic background radiation. --- Cosmic distance ladder. --- Cosmic microwave background. --- Cosmic ray. --- Cosmological constant. --- Dark energy. --- Deceleration parameter. --- Density. --- Edwin Hubble. --- Einstein field equations. --- Fritz Zwicky. --- Galaxy cluster. --- General relativity. --- George Gamow. --- Gravitational field. --- Gravitational lens. --- Gravity. --- Hubble Space Telescope. --- Hubble's law. --- Jim Peebles. --- Lambda-CDM model. --- Measurement. --- Metric expansion of space. --- Milky Way. --- Nebula. --- Neutron star. --- Newton's law of universal gravitation. --- Observable universe. --- Observational cosmology. --- Observatory. --- Paul Steinhardt. --- Photon. --- Physical cosmology. --- Physical law. --- Physicist. --- Prediction. --- Quantity. --- Quantum gravity. --- Quantum mechanics. --- Radio astronomy. --- Radio telescope. --- Science. --- Scientist. --- Shape of the universe. --- Solar mass. --- Special relativity. --- Spiral galaxy. --- Steady State theory. --- String theory. --- Supernova. --- Theoretical physics. --- Theory of relativity. --- Thought experiment. --- Ultimate fate of the universe. --- Universe. --- Vesto Slipher. --- Zwicky (crater). --- Age of the universe. --- Astronomer. --- Astronomical object. --- Astronomy. --- Astrophysics. --- Atomic nucleus. --- Background radiation. --- Beatrice Tinsley. --- Big Bang. --- Calculation. --- Cepheid variable. --- Chemical element. --- Chronology of the universe. --- Cosmic background radiation. --- Cosmic distance ladder. --- Cosmic microwave background. --- Cosmic ray. --- Cosmological constant. --- Dark energy. --- Deceleration parameter. --- Density. --- Edwin Hubble. --- Einstein field equations. --- Fritz Zwicky. --- Galaxy cluster. --- General relativity. --- George Gamow. --- Gravitational field. --- Gravitational lens. --- Gravity. --- Hubble Space Telescope. --- Hubble's law. --- Jim Peebles. --- Lambda-CDM model. --- Measurement. --- Metric expansion of space. --- Milky Way. --- Nebula. --- Neutron star. --- Newton's law of universal gravitation. --- Observable universe. --- Observational cosmology. --- Observatory. --- Paul Steinhardt. --- Photon. --- Physical cosmology. --- Physical law. --- Physicist. --- Prediction. --- Quantity. --- Quantum gravity. --- Quantum mechanics. --- Radio astronomy. --- Radio telescope. --- Science. --- Scientist. --- Shape of the universe. --- Solar mass. --- Special relativity. --- Spiral galaxy. --- Steady State theory. --- String theory. --- Supernova. --- Theoretical physics. --- Theory of relativity. --- Thought experiment. --- Ultimate fate of the universe. --- Universe. --- Vesto Slipher. --- Zwicky (crater).

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The solar system has always been a messy place in which gravity wreaks havoc. Moons form, asteroids and comets crash into planets, ice ages commence, and dinosaurs disappear. By describing the dramatic consequences of such disturbances, this authoritative and entertaining book reveals the fundamental interconnectedness of the solar system--and what it means for life on Earth. After relating a brief history of the solar system, Alan Rubin describes how astronomers determined our location in the Milky Way. He provides succinct and up-to-date accounts of the energetic interactions among planetary bodies, the generation of the Earth's magnetic field, the effects of other solar-system objects on our climate, the moon's genesis, the heating of asteroids, and the origin of the mysterious tektites. Along the way, Rubin introduces us to the individual scientists--including the famous, the now obscure, and the newest generation of researchers--who have enhanced our understanding of the galactic neighborhood. He shows how scientific discoveries are made; he discusses the uncertainty that presides over the boundaries of knowledge as well as the occasional reluctance of scientists to change their minds even when confronted by compelling evidence. This fresh historical perspective reveals science as it is: an imperfect but self-correcting enterprise. Journeying to the frontiers of knowledge, Rubin concludes with the exciting realm of astrobiology. He chronicles the history of the search for life on Mars and describes cutting-edge lines of astrobiological inquiry, including panspermia (the possible transfer of life from planet to planet), the likelihood of technologically advanced alien civilizations in our galaxy, and our probable responses to alien contact. Authoritative and up-to-date but also entertaining and fluidly written, Disturbing the Solar System will appeal to any reader who has ever picked up a rock or gazed at the moon with a sense of wonder.

Life on other planets. --- Gravity. --- Catastrophes (Geology) --- Accretion (astrophysics). --- Antimatter. --- Aristarchus (crater). --- Astrobiology. --- Astronomer. --- Astronomy. --- Astrophysics. --- Binary star. --- Canyon Diablo (meteorite). --- Carbon dioxide. --- Carbonaceous chondrite. --- Chondrite. --- Chondrule. --- Comet. --- Cosmic Background Explorer. --- Cosmic dust. --- Cosmic ray. --- Crater chain. --- Debris disk. --- Discovery and exploration of the Solar System. --- Earth's magnetic field. --- Exoplanet. --- Extinction event. --- Extraterrestrial life. --- Formation and evolution of the Solar System. --- Galactic Center. --- Geologist. --- Giant planet. --- Giant-impact hypothesis. --- Gravity anomaly. --- Heliocentrism. --- Hubble Space Telescope. --- Impact crater. --- Impact event. --- Impact structure. --- Incompatible element. --- Iridium anomaly. --- Iron meteorite. --- Jupiter. --- Kara crater. --- Lunar eclipse. --- Lunar mare. --- Lunar meteorite. --- Magnetic anomaly. --- Magnetic field. --- Magnetosphere. --- Martian meteorite. --- Mesosiderite. --- Meteor Crater. --- Meteor shower. --- Meteorite. --- Meteoroid. --- Microorganism. --- Molecular cloud. --- Moon rock. --- Nebular hypothesis. --- Neutron star. --- Nuclear explosion. --- Nuclear fusion. --- Nuclear reaction. --- Occultation. --- Oort cloud. --- Orbit. --- Orbital eccentricity. --- Orbital period. --- Origin of the Moon. --- Orion Nebula. --- Panspermia. --- Planet. --- Planetary body. --- Planetary nebula. --- Planetary surface. --- Planetary system. --- Planetesimal. --- Polarity reversal (seismology). --- Projectile. --- Radiation damage. --- Radiation pressure. --- Radioactive decay. --- Radionuclide. --- Rings of Saturn. --- Rubble pile. --- Runaway greenhouse effect. --- Saturn. --- Sediment. --- Shock metamorphism. --- Silicate. --- Small Solar System body. --- Solar System. --- Solar eclipse. --- Solar flare. --- Solar mass. --- Spacecraft. --- Spiral galaxy. --- Supernova. --- Tektite. --- Uranus. --- Urey (crater). --- Van Allen radiation belt. --- Volcanism.