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481. ADASS 2002 Conference Proceedings
... Greisen, E. G., Valdes, F. G., Calabretta, M. R., & Allen, S. L. 2003, in ASP Conf. ... In Paper I, Greisen & Calabretta (2003) describe a generalized method for specifying the coordinates of FITS data samples. ... The present paper extends the discussion to the spectral coordinates of wavelength, frequency, and velocity. ... Greisen & Calabretta (2003, ``Paper I'') describes the computation of the world or physical coordinates as a multi-step process. ... A later work (Calabretta, et al. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P4-5/ -- 25.5 Кб -- 13.03.2003
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass02/P4-5/P4-5.html -- 25.5 Кб -- 13.03.2003
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482. ADASS 2002 Conference Proceedings
Next: Status of the BIMA Image Pipeline . ... We describe all the steps of the standard reduction including per pixel error propagation: Bias correction, treatment of bad pixels, flatfielding, and filtering of cosmic ray events. ... We build difference images via image convolution with a technique called OIS (optimal image subtraction, Alard & Lupton 1998), proceed with PSF-fitting, relative photometry on all pixels and finally apply an automatic detection of variable sources. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P4-4/ -- 14.6 Кб -- 13.03.2003
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483. ADASS 2002 Conference Proceedings
... The Center for Adaptive Optics maintains a web site, which serves as a repository for software and tools related to adaptive optics. ... In the future, the CfAO web page can evolve into a complete data reduction toolbox for adaptive optics observations. ... Quirrenbach, A. 1999, in Proceedings of ESO/OSA Topical Meeting on Astronomy with Adaptive Optics, Ed. Bonaccini, D., European Southern Observatory conference and workshop proceedings, 56, 361 . ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P4-3/ -- 13.9 Кб -- 13.03.2003
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484. ADASS 2002 Conference Proceedings
... Using a simple 2-D Gaussian Point Spread Function (PSF) on a constant (flat) sky background, I derive a theoretical photometric and astrometric performance model for analytical and digital PSF-fitting stellar photometry. ... The photometric performance is maximized when either the effective background area or the effective-background-level measurement error is minimized. ... An important, but frequently ignored, noise source is the uncertainty of the measurement of the effective background level ( )...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P4-2/ -- 25.4 Кб -- 12.03.2003
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485. ADASS 2002 Conference Proceedings
... 295 Astronomical Data Analysis Software and Systems XII, eds. H. E. Payne, R. I. Jedrzejewski, & R. N. Hook (San Francisco: ASP), 431 . ... We discuss the development of a Java toolbox for astronomical time series data. ... The TSA module analyzes the time series data and performs trend prediction and rule discovery on both real time and historical data. ... Hetland, M. L. 2002, in Data Mining in Time Series Databases, ed. M. Last, A. Kandel and H. Bunke (World Scientific), in press. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P4-14/ -- 12.6 Кб -- 12.03.2003
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486. ADASS 2002 Conference Proceedings
... We are exploring the use of unlabeled data for supervised classification and for semi-supervised clustering. Current automated classification methods rely heavily on supervised learning algorithms that require training data sets containing large amounts of previously classified, or labeled, data. ... Our project relies on statistical learning to combine labeled and unlabeled data in new ways. ... One set, , consists of the labeled data where is a feature vector and is a class label. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P4-13/ -- 16.1 Кб -- 12.03.2003
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487. ADASS 2002 Conference Proceedings
... FLY is a public domain parallel treecode, which makes heavy use of the one-sided communication paradigm to handle the management of the tree structure. ... This paper shows an example of the integration of a tree N-body code with an adaptive mesh, following the PARAMESH scheme. This new implementation will allow the FLY output, and more generally any binary output, to be used with any hydrodynamics code that adopts the PARAMESH data structure, to study compressible flow problems. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P4-12/ -- 13.4 Кб -- 12.03.2003
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488. ADASS 2002 Conference Proceedings
... ClassX is a project aimed at creating an automated system to classify X-ray sources and is envisaged as a prototype of the Virtual Observatory. ... The most fundamental are: (a) classification methods and algorithms, (b) selection and definition of classes (object types), and (c) identification of source counterparts across multi-wavelength data. ... Using different sets of training parameters (attributes), we get different classifiers for the same list of class names (e.g., Figure 1). ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P4-10/ -- 13.2 Кб -- 12.03.2003
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489. ADASS 2002 Conference Proceedings
... Reads source extraction tables, FITS images from input lists and if absolute refinement is desired, a list of absolute point source positions; . ... When absolute astrometric references are available, the ``fiducial'' reference image (mosaic) frame is treated like a single input image, which contains the absolute point source positions. ... Input image overlap coverage was . ... The SSC point source extractor was then used to extract point sources from each input image (with pointing error). ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P4-1/ -- 24.0 Кб -- 12.03.2003
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490. ADASS 2002 Conference Proceedings
... Up: Data Analysis Software and Systems . ... PacketLib is a C++ open-source software library for writing applications which deal with satellite telemetry source packets, provided that the packets are compliant with the CCSDS Telemetry and Telecommand Standards. ... From an input stream of bytes, the library is able to recognize automatically the source packets (described by a simple configuration file), and provides a simple access to each packet field by means of an object oriented interface. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-9/ -- 14.0 Кб -- 12.03.2003
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491. ADASS 2002 Conference Proceedings
... Such projections are suitable for direct comparison with radio data (such as produced by AIPS), X-ray observations (e.g., ximage), optical, and IR. ... In N-body simulations, we model bulk gas, heated gas, and stars as individual particles in three-dimensional space. ... The issue of how to match a simulation to an observation runs into an interesting limitation, as finding the slice of time that corresponds to `now' is a necessary step in creating the pseudo-observation. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-8/ -- 16.4 Кб -- 12.03.2003
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492. ADASS 2002 Conference Proceedings
... Previous: Predictive Mining of Time Series Data in Astronomy . ... This paper describes a method for determining the geometric distortion of the FUSE detectors using data from the in-orbit stimulation lamp exposures. A wavelet approach is used to smooth the image, while enhancing the shape of the shadows cast by the QE and plasma grids suspended above the detectors. ... Wavelets are functions that satisfy certain mathematical requirements and are used in representing data or other functions. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-7/ -- 11.3 Кб -- 12.03.2003
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493. ADASS 2002 Conference Proceedings
... Astro Space Center, Profsojuznaya 84/32, GSP-7, 117997, Moscow, Russia . ... The algorithm allows to work easily with the first and the second derivatives of a visibility function phases and amplitudes. This approach is important for high orbiting Space VLBI data processing. ... where is a measurements of the visibility function and is an approximating function. ... If is a 2-D complex function (a model), the bi-orthogonal approximation is known in VLBI as a self-calibration algorithm. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-6/ -- 27.6 Кб -- 12.03.2003
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494. ADASS 2002 Conference Proceedings
... This paper presents an algorithm for solving antenna based polarization leakage in a radio interferometer using co-polar observations of unpolarized sources. If ignored, polarization leakage manifests itself as closure errors in parallel hand (co-polar) visibilities. ... Hence, polarization leakage manifests as increased closure errors . ... The closure phase due to polarization mis-matches between phased antennas in a radio interferometer therefore naturally measures the Pancharatnam phase. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-5/ -- 26.1 Кб -- 12.03.2003
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495. ADASS 2002 Conference Proceedings
... Up: Data Analysis Software and Systems . ... XAssist is a NASA AISR-funded project for the automation of X-ray astrophysics, with emphasis on galaxies. It is nearing completion of its initially funded effort, and is working well for Chandra and ROSAT data. ... Historically, only X-ray ``experts'' usually attempted the analysis of X-ray data. ... XAssist is capable of performing data reduction and preliminary analysis for ROSAT , Chandra and XMM-Newton data. ... Downloads data . ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-4/ -- 13.2 Кб -- 12.03.2003
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496. ADASS 2002 Conference Proceedings
... This paper describes the architecture and functionality of a general purpose two dimensional plotting package for astronomy--QtPlot. ... QtPlot supports ASCII and XML format. ... This modified package, QtPlot, supports column delimited ASCII format tables (the so-called IPAC table format), but of greater importance is the fact that it supports XML structured for astronomical plot directives, underpinned by the eXtensible Data Format(XDF), a container for transporting scientific data. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-2/ -- 12.1 Кб -- 12.03.2003
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497. ADASS 2002 Conference Proceedings
Up: Data Analysis Software and Systems . ... SAOImage DS9 is an astronomical imaging and data visualization application. It supports FITS images and binary tables, multiple frame buffers, region manipulation, and many scale algorithms and colormaps. ... The latest release of DS9, version 2.2 (October 2002), contains a number of new features, including: . ... Once DS9 is connected to Chandra-Ed, FITS images can be sent back to DS9 for display and further analysis as part of these activities. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-16/ -- 11.6 Кб -- 12.03.2003
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498. ADASS 2002 Conference Proceedings
... A tool for analyzing single-dish data, DISH, is developed on this platform. ... A complete Users' Manual and Reference Guide are available on the web in the AIPS ++ documentation sections. % dish # From the unix prompt, this # begins an AIPS ++ session # and creates the DISH tool # referred to as d . # d.show() hence calls the # dish function show - d.import('/home/gbtdata/AGBT02B_28_02','ohmaser', startscan=23,stopscan=28) # The import function converts # GBT FITS data to DISH format...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-13/ -- 12.7 Кб -- 12.03.2003
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499. ADASS 2002 Conference Proceedings
... Upon successful generation of these files, the Script Generator notifies the Queue Manager that a collection is ready to be processed. ... The Script Generator informs the Queue Manager of the collection that is waiting to be processed and also tells how many sub-stages there are to the job and what type of processing each sub-stage requires. The Queue Manager manages the various sub-stages, and if all are successful, alerts the BIMA Data Archive of the new data products to ingest. ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-12/ -- 13.0 Кб -- 12.03.2003
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500. ADASS 2002 Conference Proceedings
Next: AIPS++ Reduction and Analysis of GBT Single-Dish Spectral Data . Up: Data Analysis Software and Systems . ... 295 Astronomical Data Analysis Software and Systems XII, eds. H. E. Payne, R. I. Jedrzejewski, & R. N. Hook (San Francisco: ASP), 477 . ... 77, Astronomical Data Analysis Software and Systems IV, ed. R. A. Shaw, H. E. Payne, & J. J. E. Hayes (San Francisco: ASP), 357 . ... 238, Astronomical Data Analysis Software and Systems X , ed. F. R. Harnden, Jr., ...
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Ссылки http://www.adass.org/adass/proceedings/adass02/P3-10/ -- 15.6 Кб -- 12.03.2003
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