| Program Number | Principal Investigator | Program Title | Links |
| 10488 | Mariangela Bernardi, University of Pennsylvania | The Most Massive Galaxies in the Universe: Color-Gradients and Texture | Abstract |
| 10491 | Harald Ebeling, University of Hawaii | A Snapshot Survey of the most massive clusters of galaxies | Abstract |
| 10493 | Avishay Gal-Yam, California Institute of Technology | A Survey for Supernovae in Massive High-Redshift Clusters | Abstract |
| 10496 | Saul Perlmutter, Lawrence Berkeley National Laboratory | Decelerating and Dustfree: Efficient Dark Energy Studies with Supernovae and Clusters | Abstract |
| 10501 | Rupali Chandar, The Johns Hopkins University | xtending the Heritage: Clusters, Dust, and Star Formation in M51 | Abstract |
| 10504 | Richard Ellis, California Institute of Technology | Characterizing the Sources Responsible for Cosmic Reionization | Abstract |
| 10510 | Marcella Longhetti, Osservatorio Astronomico di Brera, Milano | Morphology of massive early-type galaxies at z>1.2: constraining galaxy formation models | Abstract |
| 10512 | William Merline, Southwest Research Institute | Search for Binaries Among Faint Jupiter Trojan Asteroids | Abstract |
| 10515 | Eric Peng, Dominion Astrophysical Observatory | The Unique Star Cluster System of M85 | Abstract |
| 10525 | Suzanne Hawley, University of Washington | Characterizing the Near-UV Environment of M Dwarfs: Implications for Extrasolar Planetary Searches and Astrobiology | Abstract |
| 10527 | Dean Hines, Space Science Institute | Imaging Scattered Light from Debris Disks Discovered by the Spitzer Space Telescope Around 20 Sun-like Stars | Abstract |
| 10532 | Kai Noeske, University of California - Santa Cruz | Kinematics and morphology of the most massive field disk galaxies at z>1 | Abstract |
| 10536 | Raghvendra Sahai, Jet Propulsion Laboratory | What Are Stalled Preplanetary Nebulae? An ACS SNAPshot Survey | Abstract |
| 10542 | Antonella Nota, Space Telescope Science Institute | Charting the Sparkling Star Formation in NGC346 | Abstract |
| 10587 | Adam Bolton, Smithsonian Institution Astrophysical Observatory | Measuring the Mass Dependence of Early-Type Galaxy Structure | Abstract |
| 10588 | Michael Brotherton, University of Wyoming | The Host Galaxies of Post-Starburst Quasars | Abstract |
| 10592 | Aaron Evans, State University of New York at Stony Brook | An ACS Survey of a Complete Sample of Luminous Infrared Galaxies in the Local Universe | Abstract |
| 10596 | Luis Ho, Carnegie Institution of Washington | AGNs with Intermediate-mass Black Holes: A Test of the Black Hole-Bulge Paradigm | Abstract |
| 10603 | Deborah Padgett, California Institute of Technology | Multiwavelength Imaging of Edge-on Protoplanetary Disks: Quantifying the Growth of Circumstellar Dust | Abstract |
| 10606 | Bill Sparks, Space Telescope Science Institute | Ultraviolet Snapshots of 3CR Radio Galaxies | Abstract |
| 10612 | Douglas Gies, Georgia State University Research Foundation | Binary Stars in Cyg OB2: Relics of Massive Star Formation in a Super-Star Cluster | Abstract |
| 10617 | Andrea Dieball, University of Southampton | HST / Chandra Monitoring of a Dramatic Flare in the M87 Jet | Abstract |
| 10626 | Yeong-Shang Loh, University of Colorado at Boulder | A Snapshot Survey of Brightest Cluster Galaxies and Strong Lensing to z = 0.9 | Abstract |
| 10628 | C. O'Dell, Vanderbilt University | Determining the Lifetime of Planetary Nebula Knots from Observations of the Core of the Helix Nebula. | Abstract |
| 10775 | Ata Sarajedini, University of Florida | An ACS Survey of Galactic Globular Clusters | Abstract |
| 10923 | Frederic Pont, Observatoire de Geneve | Measuring the size of the close-in transiting extrasolar planet HD 189733b | Abstract |
GO 10504 Characterizing the Sources Responsible for Cosmic Reionization
A 3-D model of cosmic reionisation at redshift z=5.81
|
The standard cartoon for the evolution of the Universe envisages three
distinct phases following the Big Bang: the `recombination era', spanning the
first few hundred thousand years, where the ionised hydrogen and helium
plasma generated by the Big Bang gives way to cooler, neutral atomic gas; the
`dark ages', lasting ~500,000 years, where the Universe is populated by
neutral absorbing gas; and `cosmic reionisation', where the first
episodes of star and black hole formation lead to photoionisation
of neutral hydrogen, and much increased transparency in the
inter(proto-)galactic medium. A key question for cosmological investigations
is the identity of the cosmic reionisers - were quasars (i.e. massive
black holes) primarily responsible, or were more conventional star clusters,
or Population III objects, the key ingredient? The aim of this proposal is to use gravitational lensing by massive clusters to probe the universe at redshifts beyond z=6. Combining NICMOS and ACS imaging with mid-infrared observations with Spitzer, the goal is to identify a representative sample of luminous objects at redshifts 6 < z < 10, laying the foundation for future more detailed investigations with JWST. |
GO 10512 Search for Binaries Among Faint Jupiter Trojan Asteroids
An artist's impression of the binary asteroid, Patroclus
|
Binary stars have been known for well over 300 years, but it is only within the last decade that it has been clear that asteroids are also often found in pairs. This is somewhat unexpected, since the low mass of asteroids leads to very low binding energy between the components. Both the formation mechanism(s?) and the stability of current systems remain unclear. The present program is using the HRC on ACS to carry out a snapshot survey of faint Trojan asteroids, which reside at the stable L4 and L5 Lagrange points on Jupiter's orbit. Several larger Trojans are known to be binary (e.g. Patroclus, see this link for more information), but data remain spare for the fainter members of this population. The collision environment among the Trojans is similar to that of Main Belt asteroids, but the composition is likely to be very different; thus, sampling the binary fraction over a significant range in mass should help us understand the relative importance of collisional and binary formation mechanisms. |
GO 10542 Charting the Sparkling Star Formation in NGC346
WFPC2 image of the SMC cluster, NGC 346
|
The Small Magellanic Cloud has a mass that is less than 0.5% that of the Milky Way, but it encompasses star-forming complexes that are the equal of any Galactic counterpart. The most massive such system is NGC 346, with a diameter of ~70 parsecs and lying in the main body of the SMC. The cluster includes the eruptive variable, HD 5980, which for a short period in 1994 was the most luminous star in the SMC. Previous ACS observations have revealed many compact star clusters, some still embedded in the parent dust clouds. There are also numerous low mass (< 3 solar masses) pre-main-sequence stars distributed throughout the region. The present proposal will extend observations to cover a broader swathe of the complex, using the ACS images in the V (F606W) and I (F814W) filters to probe the stellar mass function to ~0.6 solar masses, and investigate the degree of mass segregation within this active star-ofrming region. |
GO 10592 An ACS Survey of a Complete Sample of Luminous Infrared Galaxies in the Local Universe
A NICMOS image of the interacting LIRG, NGC 6090 |
Luminous infrared galaxies (LIRGs) have total luminosities that exceed
1011.4 LSun, with most of the energy emitted at wavelengths longward
of 10 microns. Many (perhaps most) of these galaxies are interacting or merging disk
galaxies, with the excess infrared luminosity generated by warm dust associated with
the extensive star formation regions. Many systems also exhibit an active nucleus, and
may be in the process of evolving towards an S0 or elliptical merger remnant. The
present program surveys a total of 88 such systems from the IRAS Revised Bright Galaxy
Sample, imaging each system with the ACS using the F439W (B) and F814W (I) filters. The
observations will probe
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