... In our numerical experiments we mainly considered two sets of simulated data provided by R. Hanisch, namely the Star Cluster and the Elliptical Galaxy 2 (Hanisch 1993). Fig. 1 shows the relative error (the inverse of the signal-to-noise ratio) achieved using the Tikhonov method in the restoration of the above mentioned images. ... As a result, Tikhonov regularization takes about sec on the initial mesh and sec on an extended mesh (IBM RISC 6000/560 with ESSL 2). ...

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• Comparisons of Implementations
• Imaging Performance of HST Compared to Future Ground-Based Adaptive Optics
• Simulation of a Distant Cluster of Normal Galaxies

... NGC 6903: The Butterfly Nebula . ... Star Size Comparisons . ... The Nebula's glowing gas surrounds hot young stars at the edge of an immense interstellar molecular cloud. Curiosity: Wheels on Mars . ... The Milky Trail . ... The Eagle Nebula and the Swan Nebula span this broad starscape, a telescopic view of the Sagittarius spiral arm toward the center of our Milky Way galaxy. ... While most spiral galaxies, including our own Milky Way, have two or more spiral arms, NGC 4725 has only one. ...

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• Star Size Comparisons

... Gravitational wave search provides insights into galaxy evolution and mergers . ... galaxies . ... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... What are typical star-to-star distances in globular clusters compared to stellar distances in our region of the galaxy? ... RELATED TOPICS: GLOBULAR CLUSTERS . ... Get instant access to subscriber content on Astronomy.com! ...

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• A simpler cosmic relation | Astronomy.com

... This SAS routine allows to compare real columns from two files, with absolute and relative tolerance. ... compare_realcols table =newfile(: table ) reftable=reffile(: table ) colnames= column list (abstol=tol1 reltol=tol2 operation=op) # newfile(: table ): name of the first file with table ( first by default ) # reffile(: table ): name of the second file with table ( first by default ) # column list : names of the columns to be compared (separated by a blank) # tol1 : absolute ...

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... Editor's choices for the most educational Astronomy Pictures of the Day about clusters of galaxies: . APOD: 2006 March 21 - The Coma Cluster of Galaxies . ... APOD: 2005 November 22 - A Galactic Collision in Cluster Abell 1185 . ... A prominent example occurs on the left of the above image of the rich cluster of galaxies Abell 1185. ... Recent observations of Abell 1185 have found unusual globular clusters of stars that appear to belong only to the galaxy cluster and not to any individual galaxy. ...

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• APOD: 2013 June 6 - Star Size Comparisons
• APOD: 2011 February 22 - Star Size Comparisons
• SNe related preprints

... We have made observations of the Perseus cluster with the Westerbork Telescope at 610 MHz. ... Several newly detected sources are identified with cluster galaxies. ... No evidence is found for the existence of the previously reported ~ 65'x25' cluster halo, 3C 84B. Key words: radio galaxies - clusters - tailed radio sources buoyancy The Perseus Cluster of galaxies is one of the most fascinating systems accessible to extragalactic astronomers. ...

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• Documentation: LEDA: parameter: vvir
• Radio spectra JAVA interface.
• Sky subtraction and object extraction

home publications > mercury . ... Big Clusters, Tiny Galaxies . ... Astronomers struggle to understand why giant star clusters form in the tiniest of galaxies . ... These clusters are probably young versions of globular clusters, but they are commonly called super star clusters. Seven dwarf galaxies within 16 million light-years have formed super star clusters, with one of these galaxies, NGC 1569, possessing two young clusters. ... Super star clusters have a lot to tell us about star formation. ...

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• ASP: A Taste of Real Astronomy ? The ESA/ESO Astronomy Exercises
• ASP: Sharing the Universe

... 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. ...

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• Cannibal Stars Cause Giant Explosions in Fornax Cluster Galaxy (ESO Press
• research field
• STScI PRC99-30: Hubble Spies Giant Star Cluster Near Galactic Center

. Next: Objects Up: Interface Previous: Interface . Please note, all integer indices in ASAP and iPython are 0-relative . Malte Marquarding 2005-11-30

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• casacore: casa::Compare_global_functions_ObjCompareFunc Struct Reference
• difx:difxmpi_mpi_related_issues [ATNF VLBI Wiki]
• Interface

Some astronomers ignore low-mass stars because they aren t very bright. However, stars with initial masses between about 0.8 Msun and 8 Msun (AGB stars) play an important role as the main site of the slow neutron capture (s-)process, which produces roughly half of the elements heavier than iron. ... From this work, we will see have a better understanding of AGB nucleosynthesis, the chemical evolution of globular clusters, and the properties of helium-rich stars. ...

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• Blue Straggler Stars
• Proposed Facility
• COALA - Computational Astrophysics Laboratory

... Up: Data Analysis Tools, Techniques, and Software . Previous: An Automatic Astronomical Classifier Based on Topological Neural Networks . ... Teuben, P. J., Wolfire, M. G., Pound, M. W., & Mundy, L. G. 2000, in ASP Conf. ... P. J. Teuben, M. G. Wolfire, M. W. Pound, L. G. Mundy . ... We have assembled a cluster of Intel-Pentium based PCs running Linux to compute a large set of Photodissociation Region (PDR) and Dust Continuum models. ... 2000). ... Teuben, P. J. 2000, BIMA memo (in preparation) . ...

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• ADASS 2003 Conference Proceedings
• Compression of Mosaic CCD Images with CompFITS2
• Structure Detection in Low Intensity X-Ray Images using the Wavelet Transform

... Stellar cinders . Born-again stars . ... Heavyweight Stars . ... What will happen inside the Sun and why? ... These are questions about "stellar evolution", the history of stars as they are transformed by nuclear processes deep inside. ... Most of what we know about stellar evolution comes from computer models of stars. ... We learn about the evolution of high-mass stars from HR diagrams of young galactic open clusters, and the evolution of low-mass metal-poor stars from old globular clusters. ...

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• Site Map | OASES Over us All is the SElfsame Sky | OASES 2010
• OASES Show at the John Hewitt Summer School | OASES Over us All is the SElfsame
• OASES at the NASUWT Annual Conference 2011 | OASES Over us All is the SElfsame

Find Similar Abstracts . ... The velocity of clusters of galaxies relative to the microwave background. ... BACKGROUND RADIATION, GALACTIC CLUSTERS, MICROWAVE SCATTERING, VELOCITY MEASUREMENT, HIGH TEMPERATURE GASES, MICROWAVES, POLARIZED RADIATION, RADIAL VELOCITY, RADIO ASTRONOMY, THOMSON SCATTERING . ... Use: Authors Title Abstract Text Text Query with Keywords Return: Query Results Query Form Database: Astronomy Instrumentation Physics and Geophysics ABSTRACT QUERY USER FEEDBACK HELP ...

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• The COOC Criterion (Criterion of Observations versus Calculations)
• Restrictions on the Scenario Parameters

... Scaling relations of galaxies: . ... 2007) . ... This research is now being extended to other clusters such as Hydra and Centaurus, by Ingo Misgeld . ... 2007 , Misgeld et al. 2008 and 2009 ) support a picture where the scaling relations of dwarf galaxies are shaped more by internal than external agents, given that colour-magnitude and magnitude-surface brightness relations agree quite well between the low-density Local Group environment and dense clusters like Fornax and Hydra. Misgeld et al. ...

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• Relative Sizes of the Alpha Centauri Components and other Objects (artistтАЩs
• Location of ESO HQ Relative to Munich | ESO
• Relative Changes with Redshift of the Fine Structure Constant | ESO

... Clustering of AGN and QSOs at z=1 . Using galaxies from the DEEP2 Redshift Survey and AGN from the AEGIS/Chandra survey and QSOs from SDSS, I present the cross-correlation function of AGN/QSOs and 'normal' galaxies at z=1. Using the known clustering of DEEP2 galaxies, this leads to an estimate of the bias and typical host dark matter halo mass of AGN/QSOs as a function of X-ray luminosity, which constrains AGN formation models. oral . ... Tuesday: AGN correlation functions, LSS, environments . ...

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• The AstroStat Slog R
• Reading Quiz
• The AstroStat Slog Blog Archive [ArXiv] 1st week, June 2008

RELATIVE SUNSPOT NUMBERS Description of Data from SGD Explanation of Data Reports: Relative Sunspot Numbers -- The relative sunspot number is an index of the activity of the entire visible disk of the Sun. ... The provisional daily Zurich relative sunspot numbers, Rz, were based upon observations made at Zurich and its two branch stations in Arosa and Locarno and communicated by M. Waldmeier of the Swiss Federal Observatory. ... This indicates the uncertainty above and below the predicted number. ...

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... This represents the first HI selected sample covering the core and the outskirts of a local cluster of galaxies. ... Optically selected samples miss a considerable number of low luminosity, low surface brightness galaxies underestimating by almost a factor 2 the number of HI rich galaxies present in the cluster volume. ... Right: The g band luminosity function for galaxies in the A1367 volume as obtained from the optically (circles) and HI (histogram) selected sample. ...

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• http://www.naic.edu/alfa/ealfa/meeting1/talks/davies.pdf
• http://www.naic.edu/~phil/430yagi/cross_01aug06.html
• modelAerostatPeriods

The fundamental properties of early-type galaxies in the Coma Cluster S.A.W. Moore et al. University of Durham, U.K. Co-authors: Lucey, J.R.; Colless, M.; Kuntschner, H.; Bower, R.; Davies, R.L. Early-type galaxies in clusters exhibit remarkably tight correlations between their global properties, e.g. the colour- magnitude relation, the Mg2 - relation and the Fundamental Plane. ... In addition, these data provide a baseline for evolutionary studies of distant clusters. ...

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• Determination of the relative orientation between radio and dynamical reference
• ALMA-related software engineering topics Bojan Nikolic web pages (r. 329)

... Bad Astronomy . ... Bitesize Astronomy . ... Bad Astro Store . ... Keep Bad Astronomy close to your heart, and help make me filthy rich. ... So far in our hop from cluster to cluster we've seen associations , then constellations , and then our first truly bound group of open clusters . ... Some open clusters have tens of thousands of stars, but a decent globular cluster has over a million. ... Our Milky Way galaxy sports about 100 globulars that we have detected. ... 2008 Phil Plait. ...

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• Phil Plait's Bad Astronomy: Mad Science
• Phil Plait's Bad Astronomy: Misconceptions

Elliptical galaxies Elliptical galaxies Rough subdivision · Normal ellipticals. ... Dwarf ellipticals (dE's). ... E dE BCD dSph 1013 - 1014 108 - 1013 107 - 109 109 107 - 108 300-1000 1-200 1-10 3 0.1­0.5 100 10­100 1­10 0.1­10 5­100 Elliptical galaxies Shapes of elliptical galaxies Elliptical galaxies Shapes of elliptical galaxies Elliptical galaxies Shapes of elliptical galaxies Elliptical galaxies Shapes of elliptical galaxies Elliptical galaxies ...

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• Database of Optical Properties -- Level: database
• Linear polarization: wavelength dependence
• Model of clusters