This week on HST


HST Programs: March 20 - March 26, 2006

Program number
Principal Investigator
Program title
Links
10173 William Sparks, STScI Infrared Snapshots of 3CR Radio Galaxies
Abstract
10334 Holland Ford, The Johns Hopkins University i-Band Dropouts around High-z Radio Quasars
Abstract
10475 Nathan Smith, University of Colorado at Boulder An ACS H-alpha Survey of the Carina Nebula
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
10524 Francesco Ferraro, Universita di Bologna Blue Stragglers: a key stellar population to probe internal cluster dynamics
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
10576 Gabriel Prochter, University of California - Santa Cruz An ACS Imaging Survey of the Galaxies Hosting Strong Mg II Absorption
Abstract
10582 Gregory Sivakoff, The University of Virginia Probing The Galaxy-wide Globular Cluster - Low Mass X-ray Binary Connection in Early-type Galaxies
Abstract
10584 Andreas Zezas, Smithsonian Institution Astrophysical Observatory The link between X-ray source and stellar populations in M81
Abstract
10591 Arjun Dey, National Optical Astronomy Observatories, AURA ACS observations of the galaxies in a giant Ly-alpha nebula at z~2.7
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
10603 Deborah Padgett, Jet Propulsion Laboratory Multiwavelength Imaging of Edge-on Protoplanetary Disks: Quantifying the Growth of Circumstellar Dust
Abstract
10605 Evan Skillman, University of Minnesota - Twin Cities Quantifying Star Formation and Feedback: The M81 Group Dwarf Galaxies
Abstract
10610 George Benedict, University of Texas at Austin Astrometric Masses of Extrasolar Planets and Brown Dwarfs
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
10762 Daniel Harris, Smithsonian Institution Astrophysical Observatory The Long X-ray Jet of Quasar 4C19.44
Abstract

Some selected highlights


GO 10475: An ACS H-alpha Survey of the Carina Nebula

HST image of NGC 3372, the Carina nebula

The Carina nebula, or NGC 3372, is a young, star-forming region lying at a distance of ~2 kpc in the southern Milky Way. This program will use ACS and WFPC2 to survey much of the nebula using narrow-passband filters centred on or near H-alpha. Carina provides an important link between well-studied nearby H II regions like Orion, and more distant mini-starbusts like 30 Doradus. The present observations will permit a census of microjets, proplyds, and silhouette disks with diameters as small as 200 AU, besides providing the first catalog of outflows (jets) from embedded low-mass stars, thin filamentary shocks, and wind-wind collisions in Carina.

GO 10493: A Survey for Supernovae in Massive High-Redshift Clusters

The high-redshift galaxy cluster RXJ0152-13 (z=0.83) [VRIJK image from ESO science archive]

Type Ia supernovae are believed to originate in the explosive deflagration of white dwarfs in binary systems. They have acquired increasing importance as cosmological tracers over the last decade. However, the formation rate of SN-Ia remains weakly constrained, particularly at moderate and high redshifts. This program aims to tackle this issue through observations of several massive galaxy clusters at redshifts between 0.5 and 0.9. Besides constraining the SN-Ia rate, these observations should also shed light on the time delay between the first onset of star formation and the appearance of SN-Ia.

GO 10603: Multiwavelength Imaging of Edge-on Protoplanetary Disks: Quantifying the Growth of Circumstellar Dust

HST image of the IRAS 04302+2247, hidden by its protoplanetary disk

Planet formation occurs within young circumstellar disks. Edge-on systems provide a particularly useful means of studying this environment, since the parent star is obscured, allowing more details of disk structure and morphology to emerge. Previous observations of several disks have revealed interesting differences in the wavelength dependence of scattering, suggesting different particle-size distributions and, perhaps, different grain growth histories. The present program targets 15 edge-on disks for high-resolution optical (ACS) and infrared (NICMOS) imaging, significantly expanding the sample of objects available for detailed analysis of dust properties.

GO 10762: The long X-ray jet of Quasar 4C19.44

The X-ray jet of 4C19.44

Highly collimated jets are common features of active galactic nuclei and quasars. 4C 19.44, variously described as a quasar and a Seyfert 1, was originally identified as a radio source in the 4C survey. Radio observations also revealed an extended jet, which is also evident at X-ray wavelengths. The present program aims to use ACS to obtain high-resolution images of the system in the F475W and F814W filters, allowing a detailed comparison of the structure of jet at radio, optical and X-ray wavelengths.

Past weeks:
page by Neill Reid, updated 15/03/2006