This week on HST


HST Programs: August 11 - August 17, 2014

Program Number Principal Investigator Program Title
12884 Harald Ebeling, University of Hawaii A Snapshot Survey of The Most Massive Clusters of Galaxies
12893 Ronald L Gilliland, The Pennsylvania State University Study of Small and Cool Kepler Planet Candidates with High Resolution Imaging
12969 Peter Garnavich, University of Notre Dame Global Properties Are Not Enough: Probing the Local Environments of Type Ia Supernovae
13117 Andrew J. Levan, The University of Warwick A Chandra/HST survey of dark gamma-ray bursts and their hosts
13291 Masao Hayashi, National Astronomical Observatory of Japan (NAOJ) Resolving internal structures of the progenitors of early-type galaxies in a vigorously forming cluster at z=2.5
13292 Remy Indebetouw, The University of Virginia Dissecting star formation in N159
13306 Gillian Wilson, University of California - Riverside Is the Size Evolution of Massive Galaxies Accelerated in Cluster Environments?
13321 Pierre Guillard, Institut d'Astrophysique Spatiale COS Spectroscopy of the Stephan's Quintet Giant Shock
13332 Seth Redfield, Wesleyan University A SNAP Survey of the Local Interstellar Medium: New NUV Observations of Stars with Archived FUV Observations
13334 Adam Riess, The Johns Hopkins University The Longest Period Cepheids, a bridge to the Hubble Constant
13344 Adam Riess, The Johns Hopkins University A 1% Measurement of the Distance Scale with Perpendicular Spatial Scanning
13352 Matthew A. Malkan, University of California - Los Angeles WFC3 Infrared Spectroscopic Parallel Survey WISP: A Survey of Star Formation Across Cosmic Time
13358 Klaus Werner, Eberhard Karls Universitat, Tubingen Trans-iron group elements in the hot white dwarf RE 0503-289
13361 William P. Blair, The Johns Hopkins University Discovering and Characterizing the Young Supernova Remnant Population in M101
13365 Martin A Cordiner, Catholic University of America Probing the nature of small-scale structure towards rho Oph stars: A new avenue in diffuse interstellar band research
13377 Andrea Mehner, European Southern Observatory - Chile Essential UV Observations of Eta Carinae's Change of State
13381 Marshall Perrin, Space Telescope Science Institute STIS Coronagraphy of Four Young Debris Disks Newly Uncovered from the NICMOS Archive
13386 Steven A. Rodney, The Johns Hopkins University Frontier Field Supernova Search
13388 Gregory James Schwarz, American Astronomical Society Fundamental properties of novae outburst: Coordinated HST and XMM ToO observations
13398 Christopher W. Churchill, New Mexico State University A Breakaway from Incremental Science: Full Characterization of the z<1 CGM and Testing Galaxy Evolution Theory
13401 Claes Fransson, Stockholm University A 3D view of the SN 1987A Ejecta
13412 Tim Schrabback, Universitat Bonn, Argelander Institute for Astronomy An ACS Snapshot Survey of the Most Massive Distant Galaxy Clusters in the South Pole Telescope Sunyaev-Zel'dovich Survey
13435 Matteo Monelli, Instituto de Astrofisica de Canarias Multiple populations in external globular glusters: the Fornax dSph, the LMC, and the SMC
13442 R. Brent Tully, University of Hawaii The Geometry and Kinematics of the Local Volume
13452 Matthew Hayes, Stockholm University Coupling the emission of ionizing radiation and Lyman alpha
13459 Tommaso L. Treu, University of California - Los Angeles The Grism Lens-Amplified Survey from Space {GLASS}
13462 Brian E. Wood, Naval Research Laboratory Tracking the Winds of Red Giants from the Star to the ISM
13484 Bo Reipurth, University of Hawaii Structure, Excitation, and Evolution of Shocks: A Multi- Wavelength Study of Herbig-Haro 1/2
13496 Jennifer Lotz, Space Telescope Science Institute HST Frontier Fields - Observations of MACSJ0416.1-2403
13517 Matthew A. Malkan, University of California - Los Angeles WFC3 Infrared Spectroscopic Parallel Survey WISP: A Survey of Star Formation Across Cosmic Time

Selected highlights

GO 12969: Global Properties Are Not Enough: Probing the Local Environments of Type Ia Supernovae


SN 2007uy and 2008D in NGC 2770
Supernovae have long attracted the attention of both amateur and professional astronomers as a means of studying the violent eruption and death of massive stars and degenerates. However, in the last decade they have also acquired considerable importance as distance indicators, tracing the expansion of the universe to redshifts well beyond the reach of more conventional yardsticks, such as cepheids, and providing a key underpinning for the hypothesised existcen of dark energy. Understanding the supernovae themselves, and, in particular, their progenitors, is key to accurately interpreting their luminosities and distances. The present SNAP program aims to tackle that aspect of the problem by using ACS to obtain deep, high resolution images of galaxies that have harboured recent type Ia supernovae. The targets are all drawn from the Sloan Digital Sky Survey, which has uncovered more than than 500 type Ia supernovae,. The supernovae themselves are long gone from view, but the ACS data will be used to probe the stellar populations in the immediate vicinity of the explosion, and hence gain a better understanding of the likely progenitor.

GO 13292: Dissecting star formation in N159


WFPC2 images of the N 159 star-forming region in the LMC
The Large Magellanic Cloud, the Milky Way's largest staellite, is the site of many star-forming regions. The most prominent is 30 Doradus, a 200-pc diameter region that has been targeted by Hubble Tarantula Treasury Project (GO 12939). That region of the LMC is gas-rich, and molecular gas extends south of 30 Doradus in a kiloparsec-long, filamentary structure. The star-forming region N159 lies close to the midpoint of that filament. Ground-based observations have resolved close to 200 OB stars within the region, which is probably no more than a few million years old. Those observartions, however, only scratch the surface of the star formation process. The present program aims to obtain deep HST imaging with the Advanced Camera for Surveys and both the UVIS and near-IR channels of Wide-Field Camera 3. Those milticolour (V, I, J, H and H-alpha) images will be combined with sub-millimetre data from the Atacama Large Millimetre Array (ALMA) and the Australia Telescope Compact Array in a search for lower-mass young-stellar objects (YSOs). The goal is to determine the stellar initial mass function to sub-solar masses, testing the agreement with observations of stars that formed in other very different environments.

GO 13381: STIS Coronagraphy of Four Young Debris Disks Newly Uncovered from the NICMOS Archive


HST NICMOS image of the edge-on debris disk in the G0 dwarf, HD 141943
Planet formation occurs in circumstellar disks around young stars. Most of the gaseous content of those disks dissipates in less than 10 million years, leaving dusty debris disks that are detectable through reflect light at near-infrared and, to a lesser extent, optical wavelengths. The structure of those disks is affected by massive bodies (i.e. planets and asteroids), which, through dynamical interactions and resonances, can produce rings and asymmetries. Analysis of the rangle of morphological structure in these systems provides insight into the distribution of properties of planetary systems. HST currently provides the only means of achieving the high-contrast required for the detection of scattered light from these disks in the presence of the bright parent stars. To date, while many systems have been observed, only a relatively small number of systems have been imaged successfully at visual or near-infrared wavelengths. Archival HST imaging exists for many nearby stars, and a suite of new reduction techniques have been applied to those data, removing the direct starlight with greater fidelity to enable detetion of faint debris disks. The present program builds on those results, using STIS to obtain more detailed images of the structure within those disks, cosntraining the likely frequency and distribution of planetary systems.

GO 13517: WISP - A Survey of Star Formation Across Cosmic Time


A region of massive star formation
Star formation is the key astrophysical process in determining the overall evolution of galactic systems, the generation of heavy elements, and the overall enrichment of interstellar and intergalactic material. Tracing the overall evolution through a wide redshift range is crucial to understanding how gas and stars evolved to form the galaxies that we see around us now. The present program builds on the ability of HST to carry out parallel observations, using more than one instrument. While the Cosmic Origins Spectrograph is focused on obtaining ultraviolet spectra of unparalleled signal-to-noise, this program uses the near-infrared grisms mounted on the Wide-Field Camera 3 infrared channel to obtain low resolution spectra between 1 and 1.6 microns of randomly-selected nearby fields. The goal is to search for emission lines characteristic of star-forming regions. In particular, these observations are capable of detecting Lyman-alpha emission generated by star formation at redshifts z > 5.6. A total of up to 40 "deep" (4-5 orbit) and 20 "shallow" (2-3 orbit) fields will be targeted in the course of this observing campaign.

Past weeks:
page by Neill Reid, updated 26/8/2014
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