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 ...
24.1 Hubble`s Galaxy Classification
... However, some galaxies have no Cepheids, and most are farther away then 25 Mpc. New distance measures are needed. The Tully–Fisher relation correlates a galaxy’s rotation speed (which can be measured using the Doppler effect) to its luminosity. In hindsight this makes sense, since faster rotation me ...
... However, some galaxies have no Cepheids, and most are farther away then 25 Mpc. New distance measures are needed. The Tully–Fisher relation correlates a galaxy’s rotation speed (which can be measured using the Doppler effect) to its luminosity. In hindsight this makes sense, since faster rotation me ...
ES 104 Midterm Exam Study Guide 1
... The stars and interstellar matter Know what a light year is and that it is used in describing stellar distances. Know that the brightness of a star is affected by its temperature and size. Know how a star’s color can indicate its relative temperature (hot vs. cool stars). Know that many stars occur ...
... The stars and interstellar matter Know what a light year is and that it is used in describing stellar distances. Know that the brightness of a star is affected by its temperature and size. Know how a star’s color can indicate its relative temperature (hot vs. cool stars). Know that many stars occur ...
Introduction to Galaxies - West Jefferson Local Schools
... Implies that Galaxies are “flying away” and that the speed with which they are moving away is proportional to there distance away. The further away the galaxy, the faster it is receding from us. (more on this later…) ...
... Implies that Galaxies are “flying away” and that the speed with which they are moving away is proportional to there distance away. The further away the galaxy, the faster it is receding from us. (more on this later…) ...
Unravelling the Origin and Evolution of Our Galaxy
... As it sweeps the sky, GAIA will observe everything that crosses its sensitive fields of view. Supernovae will be seen in huge numbers, gravitational micro-lensed events will be detected, and variable stars of all descriptions will be detected as they oscillate in brightness throughout the mission li ...
... As it sweeps the sky, GAIA will observe everything that crosses its sensitive fields of view. Supernovae will be seen in huge numbers, gravitational micro-lensed events will be detected, and variable stars of all descriptions will be detected as they oscillate in brightness throughout the mission li ...
An Eclectic View of our Milky Way Galaxy
... There are a variety of methods employed to establish θ0 , the orbital speed of the LSR, but many depend upon a few critical assumptions that can affect the results [see 22]. Two independent methods are available for establishing θ0 : by examining the motions of nearby galaxies relative to the Sun o ...
... There are a variety of methods employed to establish θ0 , the orbital speed of the LSR, but many depend upon a few critical assumptions that can affect the results [see 22]. Two independent methods are available for establishing θ0 : by examining the motions of nearby galaxies relative to the Sun o ...
Script
... planet formation theory. Many Jupiters were found at very small orbits with periods of 3–4 days (hot Jupiters), which has led to the new concept of planet migration (to allow Jupiters to form outside the ice-line and then migrate inward to very small orbits). Projects: Many projects are planned in t ...
... planet formation theory. Many Jupiters were found at very small orbits with periods of 3–4 days (hot Jupiters), which has led to the new concept of planet migration (to allow Jupiters to form outside the ice-line and then migrate inward to very small orbits). Projects: Many projects are planned in t ...
Powerpoint slides
... the Andromeda Galaxy. How far away does the audience think the Andromeda Galaxy is from the Milky Way? After their experience with stars within the galaxy, many audience members will try to send your second volunteer to another city! Surprisingly enough, the answer is eight feet, or approximately 20 ...
... the Andromeda Galaxy. How far away does the audience think the Andromeda Galaxy is from the Milky Way? After their experience with stars within the galaxy, many audience members will try to send your second volunteer to another city! Surprisingly enough, the answer is eight feet, or approximately 20 ...
Document
... stars, with a fairly large cluster core radius. The black hole certainly would have an effect on the density of stars near it, but only at a radius well inside 1% of the globular cluster core radius and only affecting a few tens of stars or so ...
... stars, with a fairly large cluster core radius. The black hole certainly would have an effect on the density of stars near it, but only at a radius well inside 1% of the globular cluster core radius and only affecting a few tens of stars or so ...
Document
... same plane and in the same direction. Halo stars also orbit the center of the galaxy, but with orbits randomly inclined to the disk of the galaxy. • How long does it take the Sun to orbit the galactic center? • Each orbit takes about 230 million years. • How do we determine galactic mass from stella ...
... same plane and in the same direction. Halo stars also orbit the center of the galaxy, but with orbits randomly inclined to the disk of the galaxy. • How long does it take the Sun to orbit the galactic center? • Each orbit takes about 230 million years. • How do we determine galactic mass from stella ...
What is a planet? - X-ray and Observational Astronomy Group
... Ptransit= R* / a For Earth (P=1yr, a=1AU), Ptransit=0.5% But for close, “hot” Jupiters, Ptransit=10% Of course, relative probability of detecting Earths is lower since would have to observe for up to 1 year ...
... Ptransit= R* / a For Earth (P=1yr, a=1AU), Ptransit=0.5% But for close, “hot” Jupiters, Ptransit=10% Of course, relative probability of detecting Earths is lower since would have to observe for up to 1 year ...
W The X-Ray Universe X-ray images of the Universe are
... Advanced X-ray Astrophysics Facility (AXAF), which is scheduled for launch in 1998. This observatory, with its four sets of nested mirrors, will be the X-ray equivalent of the Hubble Space Telescope. AXAF and other future missions will provide scientists with opportunities for deeper insight into bl ...
... Advanced X-ray Astrophysics Facility (AXAF), which is scheduled for launch in 1998. This observatory, with its four sets of nested mirrors, will be the X-ray equivalent of the Hubble Space Telescope. AXAF and other future missions will provide scientists with opportunities for deeper insight into bl ...
on the mass distribution of stars in the solar neighbourhood
... After accepting the final results one meets the question how reliable they are. Here we have three main items to consider. The first concerns the fraction of low-mass stars because if it is not so high, as found in this paper, then the present results become doubtful. A comparison can be done with I ...
... After accepting the final results one meets the question how reliable they are. Here we have three main items to consider. The first concerns the fraction of low-mass stars because if it is not so high, as found in this paper, then the present results become doubtful. A comparison can be done with I ...
PDF only - at www.arxiv.org.
... HDST builds on NASA and ESA’s foundation of missions for exoplanet discovery and characterization: Kepler, JWST, TESS, and Plato have or are expected to make fundamental advances in finding and studying planets around other stars. But even if all these missions exhaust their full potential, they wil ...
... HDST builds on NASA and ESA’s foundation of missions for exoplanet discovery and characterization: Kepler, JWST, TESS, and Plato have or are expected to make fundamental advances in finding and studying planets around other stars. But even if all these missions exhaust their full potential, they wil ...
Formation and Detectability of Terrestrial Planets around
... & Bromley 2006) in which collisions of isolated embryos, protoplanets of approximately lunar mass, dominate the evolution of the disk. During this phase, gravitational interactions among planetary embryos serve to form the final planetary system around the star and clear out the remaining material i ...
... & Bromley 2006) in which collisions of isolated embryos, protoplanets of approximately lunar mass, dominate the evolution of the disk. During this phase, gravitational interactions among planetary embryos serve to form the final planetary system around the star and clear out the remaining material i ...
Chapter 15 The Formation of Planetary Systems
... luminosity may be observed as a function of time. This is called a transit. Notice a transit requires a planetary orbit almost perfectly in the line of sight of an observer on Earth. So transits will be found in only a tiny fraction of stars, even if all have planets. The time to enter and exit the ...
... luminosity may be observed as a function of time. This is called a transit. Notice a transit requires a planetary orbit almost perfectly in the line of sight of an observer on Earth. So transits will be found in only a tiny fraction of stars, even if all have planets. The time to enter and exit the ...
Chapter 15 The Formation of Planetary Systems
... luminosity may be observed as a function of time. This is called a transit. Notice a transit requires a planetary orbit almost perfectly in the line of sight of an observer on Earth. So transits will be found in only a tiny fraction of stars, even if all have planets. The time to enter and exit the ...
... luminosity may be observed as a function of time. This is called a transit. Notice a transit requires a planetary orbit almost perfectly in the line of sight of an observer on Earth. So transits will be found in only a tiny fraction of stars, even if all have planets. The time to enter and exit the ...
Spatial distribution of stars in the Milky Way
... • We use a statistical approach to determine and describe the spatial distribution of stars in the Galaxy • This approach allows us to derive the structure of the disk and spheroidal components (density distribution and extent). • This information can then be coupled to the age and chemical composit ...
... • We use a statistical approach to determine and describe the spatial distribution of stars in the Galaxy • This approach allows us to derive the structure of the disk and spheroidal components (density distribution and extent). • This information can then be coupled to the age and chemical composit ...
Stars part 1
... The authorized reproduction or distribution of this copyrighted work is highly encouraged. Lethargic obtuseness is insubordinate and is discouraged by PBIS, as it may result in little or no monetary gain after secondary education or a fine of $250,000. ...
... The authorized reproduction or distribution of this copyrighted work is highly encouraged. Lethargic obtuseness is insubordinate and is discouraged by PBIS, as it may result in little or no monetary gain after secondary education or a fine of $250,000. ...
1 Dark matter and dark energy comprise over 90% of the Universe
... is composed of. Thus far, it has not been directly detected, cannot be seen and fails to emit electromagnetic radiation that we can detect. We believe dark matter exists because of the motions of stars, galaxies and galaxy clusters, but there are alternatives such as Modified Newtonian Dynamics, or ...
... is composed of. Thus far, it has not been directly detected, cannot be seen and fails to emit electromagnetic radiation that we can detect. We believe dark matter exists because of the motions of stars, galaxies and galaxy clusters, but there are alternatives such as Modified Newtonian Dynamics, or ...
exam 3 review lecture
... • Luminosity and jets likely come from matter falling into big black hole (millions of solar masses) at the galaxies centers • Was our galaxy an AGN once? ...
... • Luminosity and jets likely come from matter falling into big black hole (millions of solar masses) at the galaxies centers • Was our galaxy an AGN once? ...
HD 140283: A Star in the Solar Neighborhood that Formed Shortly
... We made FGS observations of HD 140283 at 11 epochs between 2003 August and 2011 March, at dates close to the biannual times of maximum parallax factor. The FGS are interferometers that, in addition to providing guiding control during imaging or spectroscopic observations, can measure precise positio ...
... We made FGS observations of HD 140283 at 11 epochs between 2003 August and 2011 March, at dates close to the biannual times of maximum parallax factor. The FGS are interferometers that, in addition to providing guiding control during imaging or spectroscopic observations, can measure precise positio ...
On the correlation between stellar chromospheric flux and the
... mosphere induced by magnetic heating that is localized close to the footpoints of the long loop (cf. Lanza et al. 2001, and references therein). Rapidly rotating late-type stars such as AB Dor show signatures of condensations absorbing in Hα, that are located a few stellar radii above the surface (C ...
... mosphere induced by magnetic heating that is localized close to the footpoints of the long loop (cf. Lanza et al. 2001, and references therein). Rapidly rotating late-type stars such as AB Dor show signatures of condensations absorbing in Hα, that are located a few stellar radii above the surface (C ...
Galactic Archaeology: Current Surveys
... reveals that these stars formed, and thus reflect conditions, at redshifts greater than 2. These stars retain some memory of the initial early conditions at which they form, and thus the early stages of galaxy evolution. The chemical elemental abundances in the stellar photospheres of main sequence ...
... reveals that these stars formed, and thus reflect conditions, at redshifts greater than 2. These stars retain some memory of the initial early conditions at which they form, and thus the early stages of galaxy evolution. The chemical elemental abundances in the stellar photospheres of main sequence ...
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.