... These Frontier Fields will combine the power of HST with the natural gravitational telescopes of high-magnification clusters of galaxies. ... We are soliciting gravitational lensing maps for the last four Hubble Frontier Fields clusters (MACSJ0717.5+3745, MACSJ1149.5+2223, AbellS1063, and Abell 370) based upon the exceptionally deep HST FF imaging and other new ancillary data. ... For the full set of proposal instructions and requirements, see the FY16 Frontier Fields Lensing Map Call for Proposals....

... The Swift X-ray Cluster Survey (SXCS) is an ongoing project aimed at finding serendipitously galaxy clusters in the Swift X-ray Telescope (XRT) archive. ... ROSAT . ... 600 km Here SXCS is compared with other X-ray cluster surveys based on Chandra or XMM data (please refer to Tundo et al. 2012 for detailed discussion). ... We are currently working to a second data release, based on a larger set of XRT fields, and on the use of a Voronoi-based algorithm "EXSdetect" tailored to the XRT data. ...

home . ... The information on this page applies to the following DFO operational machines: . ... Home directories for the operational instrument accounts (as well as other important home directories such as quality, flowmgr etc) are served to the DFO Blade nodes and the QC cluster nodes via NFS from hrs01 . ... Since 2008-10-07 , the entire /ots directory structure (i.e. including these two vital home directory systems) is backed up to the Backup Server bu2 using the ONANU.backup script . ...

... Over the first 4 years, its X-ray telescopes eROSITA and ART-XC will survey the whole sky with a record sensitivity in the 0.5-10 keV energy band. ... The goal of the second international Spectrum-RG conference is to discuss the different scientific topics addressed by the mission, synergies with surveys at other wavelengths, and requirements to follow-up observations.Contributed talks and poster presentations are invited on the topics related to the SRG science goals. ... Active galactic nuclei . ...

Astrophysics Space Missions . ... Space Physics Missions . Data Centers . ... Lectures in Space Science . ... Compton Gamma Ray Observatory (GRO) . ... University of Arizona , Theoretical Astrophysics Program Return to the top of this document . ... JHU/APL AMPTE/CCE Space Science Data Center . ... National Space Science Data Center (NSSDC) . ... Astrophysics Data Facility (ADF) at NASA/Goddard Space Flight Center . ... Center for Atmospheric and Space Sciences/Utah State University (CASS/USU) . ...

... This paper ( Burke et al. 2003 ) describes the creation of one such catalogue - the Southern Serendipitous High-redshift Archival ROSAT Cluster (SHARC) survey - which covers an area of 17.7 deg 2 and consists of 32 clusters with redshifts between 0.05 and 0.7 and X-ray luminosities between 7 x 10 42 and 4 x 10 44 erg/s: the high-redshift subsample contains 16 clusters with = 0.3 and X-ray luminosities greater than 2 x 10 43 erg/s (luminosities are quoted for the 0.5 - 2.0 keV energy band). ... 1997 ...

... Primordial theory review : Dick Bond . Defects and the CMB review : Andy Albrecht . ... Gravitational wave contribution to CMB anisotropies : V.B. Lukash and E.V. Mikheeva . C_l from cosmic strings : Lloyd Knox . Some aspects of CMB anisotropies induced from topological defects : Mairi Sakellariadou . ... CMB anisotropies from scaling sources : Ruth Durrer . ... SZ observations I : Sarah Church . ... Holes in the microwave sky? ... Detecting cosmic strings in the CMB : James Robinson . ...

... We address a question if globular clusters (GC) in a protogalaxy could for some time evolve chemically as isolated systems, enriching themselves with heavy elements produced in first supernova events that follow initial star formation. We determine both the critical mass of a protoglobular cluster that is needed to retain the ejecta of the very first supernova, and the critical energy (i.e., number of supernovae) that is needed to expel the residual gas from a cluster of a given mass. ...

News & Views There seems to be something very healthy about astronomical research when, under the same cover, an event which took place in 1333 AD (Leonid bursts as a resonance meteoroid component from Comet Temple/Tuttle) is discussed followed by a paper on how we might more effectively search for extraterrestrial intelligence (in the optical). In this issue we also have a further paper on young clusters (Praesepe) and the low end of the stellar mass function (see IAJ , 1999, 26(1), 17). ...

... How do have my images go into a different directory? To put your images into a directory other than the standard /export/images you MUST create the directory from the dryrot prompt. ... Create the directory with the following command dryrot: mkdir /export/images/ your directory Now when you set up the directory in spicam you need to type spicam: path /export/images/ your directory This will now put the images into your directory. ...

... You can create the directory manually by executing the following commands on your server: mkdir /var/www/vhosts/www.atnf.csiro.au/htdocs/research/pulsar/ppta/pub/cache chmod 777 /var/www/vhosts/www.atnf.csiro.au/htdocs/research/pulsar/ppta/pub/cache Then, reload this page . Or, for a slightly more secure installation, try executing chmod 2777 /var/www/vhosts/www.atnf.csiro.au/htdocs/research/pulsar/ppta/pub on your server and following this link . ...

... The default display type is Auto (ScanDisk ; adjusts to the current display). ... ScanTimeOut Determines whether ScanDisk should detect disk timeouts ; while performing a surface scan. ... Surface Determines whether ScanDisk will perform a surface scan: ; Never (Default) Does not perform a surface scan. ... The Prompt value causes ScanDisk to prompt you for a disk. ... The next five settings accept any of the following values: ; Prompt Causes ScanDisk to prompt you before fixing this problem. ...

... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... A star cluster hides star clusters . ... W hile exploring deep Hubble Space Telescope images of a globular star cluster called NGC 6397, astronomers stumbled on a distant background galaxy harboring hundreds of similar clusters. ... A single giant star in NGC 6397 outshines one of the background galaxy's clusters by 10 million times....

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Radio data are displayed in the following format: . After the title with name of cluster under examination and with line about kind of data under one, e.g. Radio data [ optical data ] [ radio source identifications ] [ radio spectra (1.0 or 1.1) ] . ... The first line contains the number of radio sources associated with the cluster (these are just those sources with entries in sections 'Radio galaxy', 'Radio source' and 'Radio spectrum' below). ... Radio sources in cluster: 2 # . ...

... BLUE STRAGGLER STARS are unusually hot and bright stars found in the cores of ancient star clusters known as globulars. ... BACKGROUND (from wikipedia): Blue straggler stars are stars in open or globular clusters that are hotter and bluer than other cluster stars having the same luminosity. ... There is evidence in favor of this view, notably that blue straggler stars appear to be much more common in dense regions of clusters, especially in the cores of globular clusters. ...

Astronomy Picture of the Day . Double Cluster in Perseus . ... 6.12.2007 . ... Some 7,000 light-years away, this pair of open or galactic star clusters is an easy binocular target and is visible to the unaided eye from dark sky areas. ... In addition to being physically close together, the clusters' ages based on their individual stars are similar - evidence that both clusters were likely a product of the same star-forming region. ... 2007 2008 . ... Publications with keywords: galactic cluster . ...

. Home . Structure of Data . Description . Catalog . Publications . VO . ЮБ 2000 . 11:14:20.2 . ЮД 2000 . -57:33:04 . l . 290.172 . b . 2.895 . diameter . 14.0' . (m - M) 0 . 11.4 0.05 . distance . 1900 50 pc . E(B - V) . 0.08 0.01 . log(t) . 9.65 0.05 . (J, J-H) isochrone VOTable . 2MASS data VOTable . Developed by the Team . Send us your questions or feedback

... The most powerful and widely used methods to calculate the scattering matrix of a fractal cluster are based on the coupled dipoles methods (e.g. the Discrete Dipole Approximation, DDA) and the theory of light scattering by a cluster of spherical particles [2-4]. ... At present the procedure of calculation of the scattering matrix is well developed for both an oriented cluster of spherical particles and for chaotically oriented clusters of such particles [4]. ...

... Peter J.K. "Jeff" Wisoff (Ph.D) . NASA Astronaut (former) . ... A veteran of four space flights, STS-57 in 1993, STS-68 in 1994, STS-81 in 1997 and STS-92 in 2000, Dr. Wisoff has logged a total of 42 days, 56 hours, 1 minute and 48 seconds in space, including , 19 hours and 53 minutes of EVA time in three space walks. ... Following 183 orbits of the Earth in 269 hours and 46 minutes, the eleven-day mission ended with Space Shuttle Endeavour landing at Edwards Air Force Base, California. ...