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: http://www.stsci.edu/~inr/thisweek1/2009/thisweek068.html
Дата изменения: Mon Mar 30 17:15:13 2009 Дата индексирования: Sun Apr 5 21:54:35 2009 Кодировка: Поисковые слова: galactic cluster |
Program Number | Principal Investigator | Program Title | Links |
11103 | Harald Ebeling, University of Hawaii | A Snapshot Survey of The Most Massive Clusters of Galaxies | Abstract |
11201 | Nitya Kallivayalil, Harvard University | Systemic and Internal motions of the Magellanic Clouds: Third Epoch Images | Abstract |
11704 | Brian Chaboyer, Dartmouth College | The Ages of Globular Clusters and the Population II Distance Scale | Abstract |
11785 | Howard E. Bond, Space Telescope Science Institute | Trigonometric Calibration of the Distance Scale for Classical Novae | Abstract |
11789 | George Fritz Benedict, University of Texas at Austin | An Astrometric Calibration of Population II Distance Indicators | Abstract |
11944 | Douglas R. Gies, Georgia State University Research Foundation | Binaries at the Extremes of the H-R Diagram | Abstract |
11972 | Karen J. Meech, University of Hawaii | Investigating the Early Solar System with Distant Comet Nuclei | Abstract |
11975 | Francesco R. Ferraro, Universita de Bologna | UV light from old stellar populations: a census of UV sources in Galactic Globular Clusters | Abstract |
11978 | Tommaso L. Treu, University of California - Santa Barbara | Luminous and dark matter in disk galaxies from strong lensing and stellar kinematics | Abstract |
11980 | Sylvain Veilleux, University of Maryland | Deep FUV Imaging of Cooling Flow Clusters | Abstract |
11981 | Jesus Maiz Apellaniz, Instituto de Astrofisica de Andalucia | FUV imaging survey of Galactic open clusters | Abstract |
11982 | Scott F. Anderson, University of Washington | Spanning the Reionization History of IGM Helium: a Large and Efficient HST Spectral Survey of Far-UV-Bright Quasars | Abstract |
11983 | Massimo Robberto, Space Telescope Science Institute | An Imaging Survey of Protoplanetary Disks and Brown Dwarfs in the Chamaeleon I region | Abstract |
11986 | Julianne Dalcanton, Univ. Washington | Completing HST's Local Volume Legacy | Abstract |
11987 | Michael W. Regan, Space Telescope Science Institute | The Recent Star Formation History of SINGS Galaxies | Abstract |
GO 11201: Systemic and Internal motions of the Magellanic Clouds: Third Epoch Images
GO 11789: An Astrometric Calibration of Population II Distance Indicators
GO 11982: Spanning the Reionization History of IGM Helium: a Large and Efficient HST Spectral Survey of Far-UV-Bright Quasars
GALEX, the Galaxy Evolution Explorer | The reionisation epoch for intergalactic helium is thought to occur somewhere between redshifts 3 and 4. Observations with the GALEX satellite, a NASA small explorer-class mission equipped with a 50-cm diameter telescope, are proving critical in testing this hypothesis through the identification of UV bright quasars in the appropriate redshift range. Galex was launched on 28th April 2003, and continues to operate more than 30 months beyond its nominal lifetime, conducting ultraviolet imaging and low-resolution grism spectroscopy at far-UV (125-175 nm) and near-UV (175-280 nm) wavelengths. Past HST programs by this research have used the ACS/SBC to target sources identified by cross-referencing GALEX against SDSS catalogues of moderate (1 < z < 3) and high redshift (z > 3.1) quasars. These sources can serve as effective probes of the ionisation state of the intergalactic medium at intervening redshifts. In particular, analysis of the He II Lyman-alpha absorption will shed light on the epoch of reionisation of intergalactic helium, generall placed between redshifts 3 and 4. The present program will use the ACS/SBC PR120L prism for spectroscopy of 40 QSOs with redshifts in the range 3.1 < z < 5.1. |