Hubble 2006: Science Year in Review
... The servicing mission in 1999 enhanced many of Hubble’s subsystems, including the central computer, a new solid-state data-recording system to replace the aging magnetic tape drives, and the gyroscopes needed for pointing control. A month prior to launch, a gyroscope failure had forced Hubble into ...
... The servicing mission in 1999 enhanced many of Hubble’s subsystems, including the central computer, a new solid-state data-recording system to replace the aging magnetic tape drives, and the gyroscopes needed for pointing control. A month prior to launch, a gyroscope failure had forced Hubble into ...
09 03 07 Logic Outline - The National Academies of Sciences
... We can expand on two of Mertz’s vital points. First, advances in technology, especially in computers and electronics—but also materials and other areas—can reduce telescope costs. Mertz illustrated this with an obvious example—shifting from equatorial to alt-az mounts. Second, true economy can only ...
... We can expand on two of Mertz’s vital points. First, advances in technology, especially in computers and electronics—but also materials and other areas—can reduce telescope costs. Mertz illustrated this with an obvious example—shifting from equatorial to alt-az mounts. Second, true economy can only ...
Observational Studies of Interacting Galaxies and the Development
... Interacting galaxies are thought to be the essential building blocks of elliptical galaxies under the hierarchical galaxy formation scenario. The goal of my dissertation is to broaden our understanding of galaxy merger evolution through both observational studies and instrument developments. Observa ...
... Interacting galaxies are thought to be the essential building blocks of elliptical galaxies under the hierarchical galaxy formation scenario. The goal of my dissertation is to broaden our understanding of galaxy merger evolution through both observational studies and instrument developments. Observa ...
Telescopes
... incoming light. All the big telescopes in the world are reflection telescopes (e.g., the Keck 10 m telescopes). We will focus on (Cassegrain) reflection telescopes in this ...
... incoming light. All the big telescopes in the world are reflection telescopes (e.g., the Keck 10 m telescopes). We will focus on (Cassegrain) reflection telescopes in this ...
abstracts book - Instituto de Astrofísica e Ciências do Espaço
... has secured major advances in the understanding of the physics of the stellar interiors and has allowed us to build and prepare the tools to look at other stars. Several ground facilities and space missions have completed the picture by adding the necessary data to study stars across the HR diagram ...
... has secured major advances in the understanding of the physics of the stellar interiors and has allowed us to build and prepare the tools to look at other stars. Several ground facilities and space missions have completed the picture by adding the necessary data to study stars across the HR diagram ...
Galaxy Disks Further
... Within disks, the star-formation history was studied first in our Galaxy in the Solar Neighborhood. The stellar initial mass function (IMF; the statistical distribution of stellar massses during star formation) was derived first by Salpeter (1959). Schmidt (1959) defined the Schmidt law for the rate ...
... Within disks, the star-formation history was studied first in our Galaxy in the Solar Neighborhood. The stellar initial mass function (IMF; the statistical distribution of stellar massses during star formation) was derived first by Salpeter (1959). Schmidt (1959) defined the Schmidt law for the rate ...
Clusters: age scales for stellar physics
... several results do not agree with each other completely. One example is the different age scales for open clusters, since there are several ways to estimate this parameter, as we will see. Among them, the so called upper main sequence turn off (UMSTO), a nuclear age whose observational evidence is t ...
... several results do not agree with each other completely. One example is the different age scales for open clusters, since there are several ways to estimate this parameter, as we will see. Among them, the so called upper main sequence turn off (UMSTO), a nuclear age whose observational evidence is t ...
Star Formation in the Milky Way and Nearby Galaxies Further
... focused on the collective effects of star formation, integrated over entire star-forming regions or, often, over entire galaxies. This collective conversion of baryons from interstellar gas to stars and the emergent radiation and mechanical energy from the stellar populations is most relevant to the ...
... focused on the collective effects of star formation, integrated over entire star-forming regions or, often, over entire galaxies. This collective conversion of baryons from interstellar gas to stars and the emergent radiation and mechanical energy from the stellar populations is most relevant to the ...
National Aeronautics and Space Administration
... "Your problems are great fillers as well as sources of interesting questions. I have even given one or two of your problems on a test! You certainly have made the problems a valuable resource!" (Chugiak High School, Alaska) "I love your problems, and thanks so much for offering them! I have used the ...
... "Your problems are great fillers as well as sources of interesting questions. I have even given one or two of your problems on a test! You certainly have made the problems a valuable resource!" (Chugiak High School, Alaska) "I love your problems, and thanks so much for offering them! I have used the ...
Evolution of the Milky Way with radial motions of stars and gas
... matter and rotational velocity, which also depend on the distribution of the dark matter halo). Some of those properties play an important role in determining the extent of radial displacement of stars; this is the role of the rotation curve for blurring, for example (Sect. 2.2.1). Unfortunately, de ...
... matter and rotational velocity, which also depend on the distribution of the dark matter halo). Some of those properties play an important role in determining the extent of radial displacement of stars; this is the role of the rotation curve for blurring, for example (Sect. 2.2.1). Unfortunately, de ...
- Isaac Newton Group of Telescopes
... 1996 we had the additional distraction of the Prior Options process the then UK Governments requirement for public services to be subject to competitive tendering, in this case the management of the telescopes and delivery of the instrumentation programme. So my main emotion on reading this annua ...
... 1996 we had the additional distraction of the Prior Options process the then UK Governments requirement for public services to be subject to competitive tendering, in this case the management of the telescopes and delivery of the instrumentation programme. So my main emotion on reading this annua ...
Stars, Galaxies, and Beyond
... I have prepared this summary to assist in learning some of the materials relevant to the courses named. These 300–level (junior) college courses have provided a satisfying opportunity to take a more detailed but still manageable look at astronomy and astrophysics applying to space well beyond the so ...
... I have prepared this summary to assist in learning some of the materials relevant to the courses named. These 300–level (junior) college courses have provided a satisfying opportunity to take a more detailed but still manageable look at astronomy and astrophysics applying to space well beyond the so ...
Astronomy Astrophysics - Niels Bohr Institutet
... would also be volume-complete to a sufficiently large distance (∼40 pc). For this, we chose the HD catalogue (Cannon & Pickering 1918–24), the only all-sky spectral catalogue then available. All A5-G0 stars brighter than mvis = 8.3, G0 stars in the interval 8.30 ≤ mvis ≤ 8.40, and all G5 or just G sta ...
... would also be volume-complete to a sufficiently large distance (∼40 pc). For this, we chose the HD catalogue (Cannon & Pickering 1918–24), the only all-sky spectral catalogue then available. All A5-G0 stars brighter than mvis = 8.3, G0 stars in the interval 8.30 ≤ mvis ≤ 8.40, and all G5 or just G sta ...
Strongly suggested reading: The stellar halo of the Galaxy
... A word of caution is necessary before we start our journey through the stellar halo of the Galaxy. While working on this article, I could not help but wonder whether this was a good time to write a review on the stellar halo (see, for example, previous excellent reviews by Gilmore et al. 1989; Majew ...
... A word of caution is necessary before we start our journey through the stellar halo of the Galaxy. While working on this article, I could not help but wonder whether this was a good time to write a review on the stellar halo (see, for example, previous excellent reviews by Gilmore et al. 1989; Majew ...
the PDF program book
... religion. If you need anything, please don’t hesitate to contact a member of the LOC or send us an email at [email protected]. We hope you enjoy our beautiful historic city and have a fruitful and productive scientific meeting. As we say in Sweden, välkommen! ...
... religion. If you need anything, please don’t hesitate to contact a member of the LOC or send us an email at [email protected]. We hope you enjoy our beautiful historic city and have a fruitful and productive scientific meeting. As we say in Sweden, välkommen! ...
Mapping the Pathways of Galaxy Transformation Across Time and
... many these galaxies, which are not currently forming stars, have significant reservoirs of molecular gas, which may fuel the central, supermassive black hole or later star formation episodes. We have also found that post-starburst galaxies host a disproportionate number of Tidal Disruption Events, i ...
... many these galaxies, which are not currently forming stars, have significant reservoirs of molecular gas, which may fuel the central, supermassive black hole or later star formation episodes. We have also found that post-starburst galaxies host a disproportionate number of Tidal Disruption Events, i ...
Strongly suggested reading: The Milky Way`s stellar disk
... ages. We know that in principle this enormous wealth of information about the stellar body of our Galaxy holds a key to recognizing and understanding some of the mechanisms that create and evolve disk galaxies. And it holds a key to mapping the three-dimensional gravitational potential and by implic ...
... ages. We know that in principle this enormous wealth of information about the stellar body of our Galaxy holds a key to recognizing and understanding some of the mechanisms that create and evolve disk galaxies. And it holds a key to mapping the three-dimensional gravitational potential and by implic ...
Annual Report 2011 - Max Planck Institute for Astrophysics
... SDSS group operate their own computer clusters. The former installation is designed in a similar fashion as the general system, and is maintained by an MPA system manager. The SDSS system is MS Windows based, and administered both by an MPA- and an additional SDSS-manager. During 2011 central comput ...
... SDSS group operate their own computer clusters. The former installation is designed in a similar fashion as the general system, and is maintained by an MPA system manager. The SDSS system is MS Windows based, and administered both by an MPA- and an additional SDSS-manager. During 2011 central comput ...
What Makes a Failure? Designing a New National Telescope, 1975
... this article I will limit my definition of “telescope” to traditional ground-based reflecting telescopes, such as have been used by astronomers for centuries, and of “astronomy” to traditional ground-based astronomy with observations made in the visible or near ultraviolet or infrared parts of the s ...
... this article I will limit my definition of “telescope” to traditional ground-based reflecting telescopes, such as have been used by astronomers for centuries, and of “astronomy” to traditional ground-based astronomy with observations made in the visible or near ultraviolet or infrared parts of the s ...
Chapter 5 The Evolutionary Paths Of Nearby Galaxies
... to try to understand the mechanisms behind the quenching of the star formation. I also note that a few early-type galaxies lie well outside the red sequence. These are misclassified or peculiar objects and their properties will be investigated later. To investigate whether the quenching is due to AG ...
... to try to understand the mechanisms behind the quenching of the star formation. I also note that a few early-type galaxies lie well outside the red sequence. These are misclassified or peculiar objects and their properties will be investigated later. To investigate whether the quenching is due to AG ...
W.M. Keck Observatory Annual Report 2009
... Before the 1990s the only planets known were those we all learned in school. Detecting and studying planets orbiting nearby stars is now one of the most exciting and dynamic areas of astronomy. “Exoplanet” research, a relatively new field of study, has developed beyond its initial emphasis on provin ...
... Before the 1990s the only planets known were those we all learned in school. Detecting and studying planets orbiting nearby stars is now one of the most exciting and dynamic areas of astronomy. “Exoplanet” research, a relatively new field of study, has developed beyond its initial emphasis on provin ...
X. Nuclear star clusters in low-mass early-type galaxies
... Hopkins & Quataert 2011). Since simulations and calculations involving hydrodynamics are more complex than pure gravitational computations, the theoretical framework for the dissipational formation of NSCs provides less quantitative predictions than the inspiralling cluster scenario. There is eviden ...
... Hopkins & Quataert 2011). Since simulations and calculations involving hydrodynamics are more complex than pure gravitational computations, the theoretical framework for the dissipational formation of NSCs provides less quantitative predictions than the inspiralling cluster scenario. There is eviden ...
2. The X-ray-Radio correlation for bulgeless galaxies
... Correlations between the X-ray and Radio emissions are observed for both galaxies with Active Galactic Nuclei (AGN) and in Star Forming galaxies. For the first case, the Xray/Radio correlation seems to present different slopes for Radio-loud and Radio-quiet AGN and may be used to estimate the mass o ...
... Correlations between the X-ray and Radio emissions are observed for both galaxies with Active Galactic Nuclei (AGN) and in Star Forming galaxies. For the first case, the Xray/Radio correlation seems to present different slopes for Radio-loud and Radio-quiet AGN and may be used to estimate the mass o ...
Performance Improvement of a Flexible Telescope Through
... on a more realistic situation, the thermal and associated mechanical behavior of the telescope structure can be studied from thermal model calculations, which use as input a realistic thermal state of the environment [13]. The influence of wind on a telescope is investigated in a similar exploratory ...
... on a more realistic situation, the thermal and associated mechanical behavior of the telescope structure can be studied from thermal model calculations, which use as input a realistic thermal state of the environment [13]. The influence of wind on a telescope is investigated in a similar exploratory ...
THE UV-OPTICAL COLOR MAGNITUDE DIAGRAM. II. PHYSICAL
... derived from the SDSS spectroscopic sample to measure the distribution of galaxies in the local universe (z < 0:25) and their physical properties as a function of specific star formation rate (SFR /M? ) and stellar mass (M? ). Throughout this study our emphasis is on the properties of galaxies on an ...
... derived from the SDSS spectroscopic sample to measure the distribution of galaxies in the local universe (z < 0:25) and their physical properties as a function of specific star formation rate (SFR /M? ) and stellar mass (M? ). Throughout this study our emphasis is on the properties of galaxies on an ...
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.