POISE AND EVOLUTION OF THE GALAXY : STRUCTURE ,
... Many essential paradoxes in the mechanical balance of the Galaxy are highlighted. We propose a unique and synthetic interpretation, including a cosmological theory of the origin of the observed cosmic rays, especially at the highest energies. It involves MATTER-ANTIMATTER ANNIHILATION in the median ...
... Many essential paradoxes in the mechanical balance of the Galaxy are highlighted. We propose a unique and synthetic interpretation, including a cosmological theory of the origin of the observed cosmic rays, especially at the highest energies. It involves MATTER-ANTIMATTER ANNIHILATION in the median ...
THE PHYSICAL CHARACTERIZATION OF THE STARS 1
... The stars are the basic pieces of the universe and the understanding of their properties, structure, formation and evolution is one of the most important branches of astrophysics. To characterize the stars allows to characterize the galaxies and from them the universe as a whole. As it is well known ...
... The stars are the basic pieces of the universe and the understanding of their properties, structure, formation and evolution is one of the most important branches of astrophysics. To characterize the stars allows to characterize the galaxies and from them the universe as a whole. As it is well known ...
Quasars: Back to the Infant Universe
... a black hole with mass of 1.2 billion M⊙ black hole with mass of 3 billion M⊙ ...
... a black hole with mass of 1.2 billion M⊙ black hole with mass of 3 billion M⊙ ...
Ch 05
... reached the energy breakeven point Led the program to design an observatory which would orbit the Earth – this become the Hubble Space Telescope (HST) He was able to watch its launch in 1990. This was 54 years after he had first proposed the idea in 1946! ...
... reached the energy breakeven point Led the program to design an observatory which would orbit the Earth – this become the Hubble Space Telescope (HST) He was able to watch its launch in 1990. This was 54 years after he had first proposed the idea in 1946! ...
Lifecycle of Dust in Galaxies - The National Academies of Sciences
... type of dust (scattered light) and the heating sources (hot stars). The spatial resolution of GALEX is sufficient for the dust scattering (5′′ ), but it is likely not sufficient to deal with the confusion due to crowding of the hot stars. Something like 1′′ (2.5 m) would likely be sufficient, especi ...
... type of dust (scattered light) and the heating sources (hot stars). The spatial resolution of GALEX is sufficient for the dust scattering (5′′ ), but it is likely not sufficient to deal with the confusion due to crowding of the hot stars. Something like 1′′ (2.5 m) would likely be sufficient, especi ...
UCO Focus - Lick Observatory
... The Keck Observatory found the first evidence of planets orbiting HD 7924, discovering the innermost planet in 2009 using the HIRES instrument installed on the 10-meter Keck I telescope. This same combination was also used to find other super-Earths orbiting nearby stars in planet searches led by UH ...
... The Keck Observatory found the first evidence of planets orbiting HD 7924, discovering the innermost planet in 2009 using the HIRES instrument installed on the 10-meter Keck I telescope. This same combination was also used to find other super-Earths orbiting nearby stars in planet searches led by UH ...
A Search for New Solar-Type Post-T Tauri Stars in
... we have not attempted to list flux levels of our “targets” as in fact the main aim of our proposal is to discover interesting targets not point at known objects. Our newly discovered interesting targets should not be of any more danger to the observatory than similar objects in other regions of the ...
... we have not attempted to list flux levels of our “targets” as in fact the main aim of our proposal is to discover interesting targets not point at known objects. Our newly discovered interesting targets should not be of any more danger to the observatory than similar objects in other regions of the ...
1 HABITABLE ZONES IN THE UNIVERSE GUILLERMO GONZALEZ
... runaway glaciation, respectively. Based on these, he found a very narrow CHZ for the Solar System, ranging from 0.958 to 1.004 astronomical units (AUs). Hart also introduced the continuously habitable zone concept, which takes the Sun’s gradual brightening into account; as the Sun ages, its luminosi ...
... runaway glaciation, respectively. Based on these, he found a very narrow CHZ for the Solar System, ranging from 0.958 to 1.004 astronomical units (AUs). Hart also introduced the continuously habitable zone concept, which takes the Sun’s gradual brightening into account; as the Sun ages, its luminosi ...
The Earth and Man In the Universe
... deduced from them, as to the distance of a star of the first magnitude, 46 for the minima and 497 for the maxima. It is conceivable that if the gauges were taken in every direction it would be possible to shape in this manner the exterior form of the visible starry universe, but as the circumpolar z ...
... deduced from them, as to the distance of a star of the first magnitude, 46 for the minima and 497 for the maxima. It is conceivable that if the gauges were taken in every direction it would be possible to shape in this manner the exterior form of the visible starry universe, but as the circumpolar z ...
THE DENSEST GALAXY
... the virial theorem: Mvir = βσe2 re /G. β is a parameter that depends on the structure of the galaxy and is smaller for more concentrated systems; σe is the integrated velocity dispersion within re . Following the results of Cappellari et al. (2006) for a range of Sérsic profiles, we assume β = 7, i ...
... the virial theorem: Mvir = βσe2 re /G. β is a parameter that depends on the structure of the galaxy and is smaller for more concentrated systems; σe is the integrated velocity dispersion within re . Following the results of Cappellari et al. (2006) for a range of Sérsic profiles, we assume β = 7, i ...
gateway - Thirty Meter Telescope
... TMT will use a segmented primary mirror, which was successfully pioneered on the Keck telescopes. This design is essential for extremely large telescopes. A single 30-meter diameter mirror would be too large to build and transport. TMT’s smaller segments, less than two meters across, can be more eas ...
... TMT will use a segmented primary mirror, which was successfully pioneered on the Keck telescopes. This design is essential for extremely large telescopes. A single 30-meter diameter mirror would be too large to build and transport. TMT’s smaller segments, less than two meters across, can be more eas ...
arXiv:1502.04693v1 [gr
... for which we have obtained Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) near-infrared grism spectroscopy. The sample (twenty-two in total) was observed with the G141 grism covering 1.10−1.70 µm, while fifteen were also observed with the G102 grism, which covers 0.90−1.10 µm. The additiona ...
... for which we have obtained Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) near-infrared grism spectroscopy. The sample (twenty-two in total) was observed with the G141 grism covering 1.10−1.70 µm, while fifteen were also observed with the G102 grism, which covers 0.90−1.10 µm. The additiona ...
Potential for Life on the Terrestrial Planets
... close-in planets). But exoplanets which are discovered by transits can be re-observed by the Doppler method so that their mass can also be determined if the precision is above the current signal threshold. The discovery of CoRoT-7b, the first small rocky exoplanet with measured radius and mass (Lége ...
... close-in planets). But exoplanets which are discovered by transits can be re-observed by the Doppler method so that their mass can also be determined if the precision is above the current signal threshold. The discovery of CoRoT-7b, the first small rocky exoplanet with measured radius and mass (Lége ...
14. The Milky Way Galaxy: A Spiral in Space
... 14.6 The Mass of the Milky Way Galaxy • Once all the Galaxy is within an orbit, the velocity should diminish with distance, as the dashed curve shows. • It doesn’t; more than twice the mass of the Galaxy would have to be outside the visible part to reproduce the observed curve. ...
... 14.6 The Mass of the Milky Way Galaxy • Once all the Galaxy is within an orbit, the velocity should diminish with distance, as the dashed curve shows. • It doesn’t; more than twice the mass of the Galaxy would have to be outside the visible part to reproduce the observed curve. ...
The Hipparcos Star Globe Booklet - Cosmos
... This will reveal the composition, formation and evolution of the Galaxy as never before. Gaia’s improved sensitivity will also enable the detection of numerous extra-galactic objects, asteroids and extrasolar planets, and provide a number of stringent new tests for general relativity and cosmology. ...
... This will reveal the composition, formation and evolution of the Galaxy as never before. Gaia’s improved sensitivity will also enable the detection of numerous extra-galactic objects, asteroids and extrasolar planets, and provide a number of stringent new tests for general relativity and cosmology. ...
Chapter 16 - Astronomy
... 6. Since there are no white dwarfs near the Sun, this portion of the Galactic disk must be no older than about 10 billion years. 7. The presence of O- and B-type stars primarily near the Galactic plane suggests that star formation does not occur to any great extent except along the plane. 8. Stars i ...
... 6. Since there are no white dwarfs near the Sun, this portion of the Galactic disk must be no older than about 10 billion years. 7. The presence of O- and B-type stars primarily near the Galactic plane suggests that star formation does not occur to any great extent except along the plane. 8. Stars i ...
Research proposal uploaded for ESO fellowship
... How is the star formation history of galaxies affected by supernovae feedback? Is this feedback powerful enough as to drive the global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat ...
... How is the star formation history of galaxies affected by supernovae feedback? Is this feedback powerful enough as to drive the global star formation rate decline of the universe? Supernova feedback represents a long standing problem in galaxy formation model. Currently, toy models are used to treat ...
Rotation in the ZAMS: Be and Bn stars
... there is a lack of Be stars with masses M < ∼ 7M⊙ in the first half of the MS phase. However, Fig. 3b shows that apparent V=7 magnitude limited counts of Bn stars increase strongly at spectral types cooler than B7. Since most of them are dwarfs, they probably had not enough time to attain the angula ...
... there is a lack of Be stars with masses M < ∼ 7M⊙ in the first half of the MS phase. However, Fig. 3b shows that apparent V=7 magnitude limited counts of Bn stars increase strongly at spectral types cooler than B7. Since most of them are dwarfs, they probably had not enough time to attain the angula ...
It is now recognized that the vast majority of ellipticals are of
... profiles at small radii; instead, the profiles rise inward to the last measured point. • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to counter-rotate with respect to the rest of the galaxy . • A few nearby E galaxies have nuc ...
... profiles at small radii; instead, the profiles rise inward to the last measured point. • Cores may exhibit unusual kinematics; for example, about a quarter of all elliptical galaxies have cores which appear to counter-rotate with respect to the rest of the galaxy . • A few nearby E galaxies have nuc ...
What we can measure
... the sun – since we have the planets orbiting the sun. We are only now being able to “see” other planets orbit other stars since those stars are so far away. However, we notice that there are lots of stars that orbit each other – and we can use that to get the mass of the bigger (central) star. ...
... the sun – since we have the planets orbiting the sun. We are only now being able to “see” other planets orbit other stars since those stars are so far away. However, we notice that there are lots of stars that orbit each other – and we can use that to get the mass of the bigger (central) star. ...
The densest galaxy - SelectedWorks
... self-enrichment by the winds of asymptotic giant branch stars (Gratton et al. 2012). Our results suggest light-element selfenrichment may also be present in UCDs, presumably related to their high stellar densities. We note that [Na/Fe] varies strongly with σ in early-type galaxies, increasing from ∼ ...
... self-enrichment by the winds of asymptotic giant branch stars (Gratton et al. 2012). Our results suggest light-element selfenrichment may also be present in UCDs, presumably related to their high stellar densities. We note that [Na/Fe] varies strongly with σ in early-type galaxies, increasing from ∼ ...
PDF only - at www.arxiv.org.
... over one billion years, in a sample of such systems. If a terrestrial planet could exist in a stable orbit for this length of time it is likely to be able to exist there for the duration of that star’s main sequence lifetime. A putative terrestrial planet may exist in an orbit that is not only stabl ...
... over one billion years, in a sample of such systems. If a terrestrial planet could exist in a stable orbit for this length of time it is likely to be able to exist there for the duration of that star’s main sequence lifetime. A putative terrestrial planet may exist in an orbit that is not only stabl ...
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 ...
The Young Exoplanet Transit Initiative (YETI)
... The RV technique has led to the discovery of ∼500 planet candidates, of which some 20 % are confirmed by either the astrometry or transit technique (see e.g. exoplanet.eu for updates). The latter method has detected ∼100 planets, all of which have been confirmed by RV data (or transit timing, see Li ...
... The RV technique has led to the discovery of ∼500 planet candidates, of which some 20 % are confirmed by either the astrometry or transit technique (see e.g. exoplanet.eu for updates). The latter method has detected ∼100 planets, all of which have been confirmed by RV data (or transit timing, see Li ...
Disk Galaxies and problem 3
... This is observationally seen in grand-design spirals, such as M51. The tidal arms are also easily produced in numerical simulations, see Fig. 7. • Bar spiral arms. A rotating bar at the centre of galaxies can also induce spiral arms that can last for a long time. This may be another way to form gran ...
... This is observationally seen in grand-design spirals, such as M51. The tidal arms are also easily produced in numerical simulations, see Fig. 7. • Bar spiral arms. A rotating bar at the centre of galaxies can also induce spiral arms that can last for a long time. This may be another way to form gran ...
Space Interferometry Mission
The Space Interferometry Mission, or SIM, also known as SIM Lite (formerly known as SIM PlanetQuest), was a planned space telescope developed by the U.S. National Aeronautics and Space Administration (NASA), in conjunction with contractor Northrop Grumman. One of the main goals of the mission was the hunt for Earth-sized planets orbiting in the habitable zones of nearby stars other than the Sun. SIM was postponed several times and finally cancelled in 2010.In addition to hunting for extrasolar planets, SIM would have helped astronomers construct a map of the Milky Way galaxy. Other important tasks would have included collecting data to help pinpoint stellar masses for specific types of stars, assisting in the determination of the spatial distribution of dark matter in the Milky Way and in the Local Group of galaxies and using the gravitational microlensing effect to measure the mass of stars.The spacecraft would have used optical interferometry to accomplish these and other scientific goals. This technique collects light with multiple mirrors (in SIM's case, two) which is combined to make an interference pattern which can be very precisely measured.The initial contracts for SIM Lite were awarded in 1998, totaling US$200 million. Work on the SIM project required scientists and engineers to move through eight specific new technology milestones, and by November 2006, all eight had been completed.SIM Lite was originally scheduled for a 2005 launch, aboard an Evolved Expendable Launch Vehicle (EELV). As a result of continued budget cuts, the launch date has been pushed back at least five times. NASA has set a preliminary launch date for 2015 and U.S. federal budget documents confirm that a launch date is expected ""no earlier"" than 2015. The budget cuts to SIM Lite are expected to continue through FY 2010. As of February 2007, many of the engineers working on the SIM program had moved on to other areas and projects, and NASA directed the project to allocate its resources toward engineering risk reduction. However, the preliminary budget for NASA for 2008 included zero dollars for SIM.In December 2007, the Congress restored funding for fiscal year 2008 as part of an omnibus appropriations bill which the President later signed. At the same time the Congress directed NASA to move the mission forward to the development phase. In 2009 the project continued its risk reduction work while waiting for the findings and recommendations of the Astronomy and Astrophysics Decadal Survey, Astro2010, performed by the National Academy of Sciences, which would determine the project's future.On 13 August 2010, the Astro2010 Decadal Report was released and did not recommend that NASA continue the development of the SIM Lite Astrometric Observatory. This prompted NASA Astronomy and Physics Director, Jon Morse, to issue a letter on 24 September 2010 to the SIM Lite project manager, informing him that NASA was discontinuing its sponsorship of the SIM Lite mission and directing the project to discontinue Phase B activities immediately or as soon as practical. Accordingly, all SIM Lite activities were closed down by the end of calendar year 2010.