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: http://www.stsci.edu/~inr/thisweek1/thisweek331.html
Дата изменения: Fri Jun 8 23:36:03 2007 Дата индексирования: Tue Oct 2 14:15:55 2012 Кодировка: Поисковые слова: galaxy cluster |
Program Number | Principal Investigator | Program Title | Links |
10404 | Andrew W. Zirm, Universiteit Leiden | The Nature of Protocluster Galaxies at z=2.16: Morphology-Density and Color-Magnitude Relations | Abstract |
10508 | William M. Grundy, Lowell Observatory | Orbits, Masses, and Densities of Three Transneptunian Binaries | Abstract |
10521 | Jason Surace, California Institute of Technology | ACS Imaging of a Unique Spitzer Field: Morphology of mid-IR Variable Sources | Abstract |
10578 | Ignasi Ribas, Institut d'Estudis Espacials de Catalunya | Eclipsing Binaries in the Local Group: Calibration of the Zero-point of the Cosmic Distance Scale and Fundamental Properties of Stars in M31 | Abstract |
10802 | Adam Riess, Space Telescope Science Institute | SHOES-Supernovae, HO, for the Equation of State of Dark energy | Abstract |
10809 | Pieter van Dokkum, Yale University | The nature of dry mergers in the nearby Universe | Abstract |
10814 | Joel N. Bregman, University of Michigan | The Masses for ultraluminous X-ray sources | Abstract |
10833 | Bradley Peterson, The Ohio State University Research Foundation | Host Galaxies of Reverberation Mapped AGNs | Abstract |
10861 | David Carter, Liverpool John Moores University | An ACS Treasury Survey of the Coma cluster of galaxies | Abstract |
10881 | Graham Smith, University of Birmingham | The Ultimate Gravitational Lensing Survey of Cluster Mass and Substructure | Abstract |
10882 | William Sparks, Space Telescope Science Institute | Emission Line Snapshots of 3CR Radio Galaxies | Abstract |
10906 | Sylvain Veilleux, University of Maryland | The Fundamental Plane of Massive Gas-Rich Mergers: II. The QUEST QSOs | Abstract |
10910 | John A. Biretta, Space Telescope Science Institute | HST / Chandra Monitoring of a Dramatic Flare in the M87 Jet | Abstract |
10921 | C. O'Dell, Vanderbilt University | Tangential Velocities of Objects in the Orion Nebula and Locating the Embedded Outflow Sources | Abstract |
11003 | Lori M. Lubin, University of California - Davis | Mixing It Up : Gas, Stars, Starbirth, and AGN in a Supercluster at z = 0.9 | Abstract |
11011 | C. S. Kochanek, The Ohio State University Research Foundation | Dissecting An Accretion Disk | Abstract |
GO 10508: Orbits, Masses, and Densities of Three Transneptunian Binaries
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The Kuiper Belt consists of icy planetoids that orbit the Sun within a broad band stretching from Neptune's orbit (~30 AU) to distance sof ~50 AU from the Sun (see David Jewitt's Kuiper Belt page for details). Over 500 KBOs (or trans-Neptunian objects, TNOs) are currently known out of a population of perhaps 70,000 objects with diameters exceeding 100 km. Approximately 2% of the known KBOs are binary (including Pluto, one of the largest known KBOs, regardless of whether one considers it a planet or not). This is a surprisingly high fraction, given the difficulties involved in forming such systems and the relative ease with which they can be disrupted. It remains unclear whether these systems formed from single KBOs (through collisions or 3-body interactions) as the Kuiper Belt and the Solar System have evolved, or whether they represent the final tail of an initial (much larger) population of primordial binaries. These issues can be addressed, at least in part, through deriving a better understanding of the composition of KBOs - and those properties can be deduced by measuring the orbital parameters for binary systems. The present proposal aims to use the ACS/HRC to determine the relative orbits for several known KBO binaries. Just as with binary stars, the orbital period and semi-major axis give the total system mass, while the mid-infrared properties (measured by Spitzer) allow an assessment of the surface area/diameters; combining these measurements gives an estimate of the mean density. |
GO 10578: Eclipsing Binaries in the Local Group: Calibration of the Zero-point of the Cosmic Distance Scale and Fundamental Properties of Stars in M31
GO 10881: The Ultimate Gravitational Lensing Survey of Cluster Mass and Substructure
GO 10921: Tangential Velocities of Objects in the Orion Nebula and Locating the Embedded Outflow Sources