This week on HST


HST Programs: June 4 - June 10, 2007

Program Number Principal Investigator Program Title Links
10561 Andrea Dieball, University of Southampton A deep UV imaging survey of the Globular Cluster M 30 Abstract
10792 Matthias Dietrich, The Ohio State University Research Foundation Quasars at Redshift z=6 and Early Star Formation History Abstract
10798 Leon Koopmans, Kapteyn Astronomical Institute Dark Halos and Substructure from Arcs & Einstein Rings Abstract
10800 Keith Noll, Space Telescope Science Institute Kuiper Belt Binaries: Probes of Early Solar System Evolution Abstract
10802 Adam Riess, Space Telescope Science Institute SHOES-Supernovae, HO, for the Equation of State of Dark energy Abstract
10833 Bradley Peterson, The Ohio State University Research Foundation Host Galaxies of Reverberation Mapped AGNs Abstract
10841 Rupali Chandar, Observatories of the Carnegie Institution of Washington A Proper Motion Search for Intermediate Mass Black Holes in Globular Clusters (2nd Epoch Observations) Abstract
10862 John Clarke, Boston University Comprehensive Auroral Imaging of Jupiter and Saturn during the International Heliophysical Year Abstract
10869 Alain Lecavelier des Etangs, CNRS, Institut d'Astrophysique de Paris The upper atmosphere and the escape state of the transiting very-hot-Jupiter HD189733b Abstract
10873 Mark Whittle, The University of Virginia The Radio-quiet Jet Flow in Markarian 34 Abstract
10877 Weidong Li, University of California - Berkeley A Snapshot Survey of the Sites of Recent, Nearby Supernovae Abstract
10887 Andrew Bunker, University of Exeter Stellar Populations in a z=4 Lensed Galaxy with NICMOS Abstract
10893 Peter Garnavich, University of Notre Dame Sweeping Away the Dust: Reliable Dark Energy with an Infrared Hubble Diagram Abstract
10902 Goran Ostlin, Stockholm University The Nearest Luminous Blue Compact Galaxies: A Window on Galaxy Formation /td> Abstract
10927 Wei-Chun Jao, Georgia State University The Weight-Watcher Program for Subdwarfs Abstract
11079 Luciana Bianchi, The Johns Hopkins University Treasury Imaging of Star Forming Regions in the Local Group: Complementing the GALEX and NOAO Surveys Abstract
11080 Daniela Calzetti, University of Massachusetts Exploring the Scaling Laws of Star Formation Abstract
11082 Christopher Conselice, Univ. of Nottingham NICMOS Imaging of GOODS: Probing the Evolution of the Earliest Massive Galaxies, Galaxies Beyond Reionization, and the High Redshift Obscured Universe Abstract
11155 Marshall D. Perrin, University of California - Berkeley Dust Grain Evolution in Herbig Ae Stars: NICMOS Coronagraphic Imaging and Polarimetry Abstract
11157 Joseph H. Rhee, University of California - Los Angeles NICMOS Imaging Survey of Dusty Debris Around Nearby Stars Across the Stellar Mass Spectrum Abstract
11310 Agustin Sanchez-Lavega Universidad del Pais Vasco Jupiter's North Temperate Belt Disturbance Abstract

Some selected highlights

GO 10792: Quasars at Redshift z=6 and Early Star Formation History

SDSS 1030+0524, one of the high redshift QSOs targeted in this program One of the major achievements of the Sloan Digital Sky Survey has been the detection of numerous high redshift quasars. These high luminosity objects serve as cosmic lamp-posts when it comes to probing star formation at such early epochs (lookback times exceeding 10 Gyrs): quasars are powered by accretion onto black holes, which are likely to form in high-mass (proto-)galaxies; those galaxies, in turn, are likely to be in high density environments (i.e. proto-clusters); thus, detailed investigations of the properties of high-redshift QSOs is likely to provide a snapshot of galaxy structure at those early epochs. The present proposal concentrates on z>6 QSOs, using the NICMOS grisms to obtain low resolution near-IR spectra that will allow measurement of the relative abundance of Fe and Mg in those objects. Magnesium is an alpha element, generated predominantly in Type II SN; Fe comes predominantly from Type I SN, which require 0.5-1 Gyrs to reach fruition; hence, this ratio provides an estimate of the time that has elapsed since the first outburst of star formation in these systems.

GO 10877: A Snapshot Survey of the Sites of Recent, Nearby Supernovae

A recent supernova in M100 Supernovae mark the (spectacular) evolutionary endpoint for a subset of stellar systems. Standard models predict that they originate from massive stars and (probably) close binaries with a compact (WD, neutron star) component, but there are still some questions remaining over whether we fully understand the range of possible progenitors. The last decade has seen the development of a number of large-scale programs, usually using moderate-sized telescopes, that are dedicated to monitoring (relatively nearby galaxies, searching for new supernovae. This program obtains follow-up images of recent supernovae, concentrating on systems within 20 Mpc of the Milky Way. The observations are taken well after maximum, with the aim of using the high spatial resolution of WFPC2 to identify the fading remnant and perhaps determine its origin.

GO 11082: NICMOS Imaging of GOODS: Probing the Evolution of the Earliest Massive Galaxies, Galaxies Beyond Reionization, and the High Redshift Observational Universe

ACS images of a section of the GOODS fields The Great Observatories Origins Deep Survey, is a large-scale program that is designed to probe galaxy formation and evolution at redshifts from z~1 to z~6. GOODS covers two ~150 sq. arcminute fields, one centred on the Hubble Deep Field and the second on the Chandra Deep Field South, and combines deep oppical/far-red imaging (F435W, F606W, F775W and F850LP filters) using ACS on HST with deep IRAC (3.6 to 8 micron) and MIPS (25 micron) imaging with Spitzer. Chandra data are also available for the bulkd of the field. The present program aims to supplement those data with near-infrared H-band (F160W) imaging with NICMOS, coupled (eventually) with parallel ultraviolet observations using the ACS/SBC.

GO 11310: Jupiter's North Temperate Belt Disturbance

Jupiter on April 23, 2007 (taken by (see Christopher Go ); the image is inverted. The light brown spot with darker centre, lying on the northern edge of the North Temperate Belt, was a precursor to the development of new structure in the NTB. Jupiter on April 29, 2007 (also (see Christopher Go ); the NTB shows more extensive disturbances and the dark spot is Io's shadow.

Jupiter's atmosphere is characterised by series of banded latitudinal features, designated alternately as belts (dark features) or zones. These are circulation cells, produced by the high Coriolis force generated by Jupiter's dense atmosphere and rapid rotation rate (the diurnal period of 9.9 hours corresponds to a speed of 12.5 km/sec at the equator). The different colours correspond to different depths within the Jovian atmosphere, with the lighter-coloured zones generally corresponding to ammonia clouds in the uppermost layers. In general, the belt/zone structure is fairly stable with time, although smaller-scale disturbances are not infrequent (such as the recent appearance of a ). During March, a disturbance developed in the North Temperate Belt, with the appearance of several bright spots that developed darker trailing features. This type of behaviour has been seen several times in the past, most recently in 1990, and often culminates in the formation of a new dark zone that circumnavigates the entire NTB. This proposal will use multicolour imaging with WFPC2 to sample Jupiter's atmosphere at different depths, and hence investigate the wind profile in the disturbed region.


Past weeks:
page by Neill Reid, updated 23/4/2007