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181. http://www.adass.org/adass/proceedings/adass00/reprints/P1-12.pdf
Astronomical Data Analysis Software and Systems X ASP Conference Series, Vol. ... F. A. Primini, and H. E. Payne, eds. AIRY : Astronomical Image Restoration in interferometrY Serge Correia, Marcel Carbillet, Luca Fini Arcetri Astrophysical Observatory, Largo E. Fermi 5, 50125 Firenze, Italy Patrizia Boccacci , Mario Bertero INFM and Department of Computer and Information Sciences, University of Genova, Via Dodecaneso 35, 16146 Genova, Italy Antonella ... Cubes SIM - Save IMage struct. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-12.pdf -- 279.6 Кб -- 29.05.2001
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182. http://www.adass.org/adass/proceedings/adass00/reprints/P1-13.pdf
... F. A. Primini, and H. E. Payne, eds. Parallelization of Widefield Imaging in AIPS++ K. Golap, A. Kemball, T. Cornwell, W. Young National Radio Astronomy Observatory Abstract. ... Parallelization of Widefield Imaging in AIPS++ where : Vk (u, v )= Ik (l - lk ,m - mk )exp j 2 (u(l - lk )+ v (m - mk ))dl dm 409 The iterative multi-stage algorithm implemented in AIPS++ proceeds as follows: · Calculate residual images for all facets (using 2-D transforms). ... Recalculate residual images and repeat. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-13.pdf -- 74.7 Кб -- 29.05.2001
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183. http://www.adass.org/adass/proceedings/adass00/reprints/P1-14.pdf
... F. A. Primini, and H. E. Payne, eds. Ionospheric Corrections in AIPS++ Oleg Smirnov Netherlands Foundation for Research in Astronomy (ASTRON) P.O. Box 2 7990 AA Dwingeloo, The Netherlands Abstract. ... Campbell (1999) has experimented both with an a priori theoretical model of the ionosphere, and with GPS observations, to perform ionospheric corrections in VLBI observations. ... Given a time and date, PIM can compute a predicted electron density distribution for any region of the ionosphere. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-14.pdf -- 69.4 Кб -- 29.05.2001
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184. http://www.adass.org/adass/proceedings/adass00/reprints/P1-15.pdf
Astronomical Data Analysis Software and Systems X ASP Conference Series, Vol. ... F. A. Primini, and H. E. Payne, eds. Redesign and Reimplementation of XSPEC Ben Dorman and Keith Arnaud Laboratory for High Energy Astrophysics, Code 664, NASA/Goddard Space Flight Center, Greenbelt, MD 20771 1,2 Abstract. ... Code Features Data Package The XSPEC data library design makes use of three design patterns (Gamma et al. 1995) in order to allow a flexible upgradeable capability to read and process Xray data. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-15.pdf -- 74.0 Кб -- 29.05.2001
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185. http://www.adass.org/adass/proceedings/adass00/reprints/P1-16.pdf
... F. A. Primini, and H. E. Payne, eds. A Flexible Ob ject Oriented Design for Page Formating Nancy R. Adams-Wolk Harvard-Smithsonian Center for Astrophysics, Cambridge MA, 02138 Abstract. ... One result of this development is the sum format page tool. ... 420 Adams-Wolk DOCUMENT CLASS PAGE CLASS PAGE CLASS PAGE CLASS ROW CLASS ROW CLASS PAGE CLASS ROW CLASS ROW CLASS PAGE CLASS ROW CLASS ROW CLASS ITEM CLASS ROW CLASS ROW CLASS COLUMN COLUMN ITEM CLASS ITEM CLASS ITEM CLASS Figure 1. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-16.pdf -- 59.1 Кб -- 29.05.2001
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186. http://www.adass.org/adass/proceedings/adass00/reprints/P1-17.pdf
... This unit is connected to the serial port of the control computer. ... The server itself knows at every moment the status of controlled devices and can send the answer immediately to a client; the spectrograph may be controlled from any computer which is connected to Ethernet and is allowed to do so; the client can be linked to various programs and so it can extend their functions; and several clients can run at the same time, some of them only monitoring the status of the spectrograph. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-17.pdf -- 73.7 Кб -- 29.05.2001
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187. http://www.adass.org/adass/proceedings/adass00/reprints/P1-19.pdf
... The residual bias signal is spatially constant, so that application of flatfield images during calibration gives rise to an imprint of the flatfield structure. ... It assumes that the flatfielded signal in each pixel can be expressed as Cxy = Ixy + bias в Qxy , (3) where Cxy is the calibrated value of pixel (x, y ), Ixy is the intrinsic signal from sky and sources, bias is the residual bias signal in a given quadrant, and Qxy is again the relative quantum efficiency (flatfield) value. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-19.pdf -- 108.9 Кб -- 29.05.2001
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188. http://www.adass.org/adass/proceedings/adass00/reprints/P1-20.pdf
... F. A. Primini, and H. E. Payne, eds. Deconvolution of "Drizzled" and Rotated HST/WFPC2 Images: Faint-ob ject Photometry in Crowded Fields Raymond Butler, Aaron Golden, Andrew Shearer Department of Information Technology, National University of Ireland Galway, University Road, Galway, Ireland Abstract. ... This makes it an excellent starting point for our non-linear subsampled MEM (Maximum Entropy Method) deconvolution approach to star detection and crowded-field photometry on HST/WFPC2 images. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-20.pdf -- 363.6 Кб -- 29.05.2001
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189. http://www.adass.org/adass/proceedings/adass00/reprints/P1-21.pdf
... Introduction The Chandra X-Ray Observatory (Chandra) produces sharper images then any other X-ray telescope to date (less then 1 on-axis), and therefore provides a unique opportunity for high-angular resolution studies of cosmic X-ray sources. ... In addition to these standard PSF libraries, the user may construct their own library files as long as the FITS HDUs and the PSF images conform to the general Chandra PSF library format. ... The The Chandra X-ray Observatory PSF Library 437 Figure 1. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-21.pdf -- 91.9 Кб -- 29.05.2001
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190. http://www.adass.org/adass/proceedings/adass00/reprints/P1-22.pdf
... As with all space-based CCD detectors, radiation damage will accrue with time and substantially increase the dark current of individual pixels, resulting in "warm pixels." ... The CXC data systems group has developed software to analyze the star image data and identify warm pixels as part of standard processing. ... These dark current maps show the expected number of counts to be registered by each CCD pixel when no source photons fall on it. ... The typical star image will have a FWHM of 1.8 pixels...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-22.pdf -- 540.4 Кб -- 29.05.2001
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191. http://www.adass.org/adass/proceedings/adass00/reprints/P1-23.pdf
Astronomical Data Analysis Software and Systems X ASP Conference Series, Vol. ... We here present an overview of Cel ldetect, a source detection program for Chandra. ... The size of the cell is chosen to be some large fraction of the Point Spread Function (PSF) size. ... These are subtracted from the cell counts. ... Cel ldetect starts analysis with a 2048 в 2048 unblocked "window" at the cen- Sliding-Cell Detection Program for Chandra Data 445 PSF Limit Cell 2k x 2k Window Detector Edge Figure 3. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-23.pdf -- 111.7 Кб -- 29.05.2001
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192. http://www.adass.org/adass/proceedings/adass00/reprints/P1-24.pdf
... F. A. Primini, and H. E. Payne, eds. SLIM: A Program to Simulate the ACS Sp ectroscopic Mo des N. Pirzkal, A. Pasquali, R. N. Hook, J. R. Walsh, R. A. E. Fosbury, W. Freudling, R. Albrecht ST-ECF, Karl-Schwarzschild Str-2, Garching bei Muenchen D-85748, Germany Abstract. SLIM is a program developed at ST-ECF to simulate direct and slitless spectroscopic images. ... ACS is scheduled to be launched in 2001, and simulated data are needed to test future slitless spectroscopy extraction software. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-24.pdf -- 103.4 Кб -- 29.05.2001
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193. http://www.adass.org/adass/proceedings/adass00/reprints/P1-25.pdf
... The VIMOS Data Reduction Software (DRS) has been designed specifically to satisfy these two requirements. ... Starting from the general instrument calibrations, specific calibrations are obtained for each specific mask used for an observation (see Figure 1): (a) the Mask Preparation Software used by the astronomer to define the slitlets positions for MOS observations (see Bottini, Garilli, Tresse 2001) produces an Aperture Automated Extraction for MOS and IFU Observations VIMOS ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-25.pdf -- 66.2 Кб -- 29.05.2001
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194. http://www.adass.org/adass/proceedings/adass00/reprints/P1-26.pdf
... The MPS provides the astronomer with tools for the selection of the ob jects to be spectroscopically observed, including interactive ob ject selection, handling of curved slits, and an algorithm for automatic slit positioning that derives the most effective solution in terms of the number of ob jects selected per field. ... Given a catalog of ob jects, SPOC maximizes the number of observable ob jects in a single exposure and computes the corresponding slit positions. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-26.pdf -- 78.0 Кб -- 29.05.2001
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195. http://www.adass.org/adass/proceedings/adass00/reprints/P1-27.pdf
Astronomical Data Analysis Software and Systems X ASP Conference Series, Vol. ... We also examine the competing science product data formats, and discuss the conventions for representing the data in a multi-extension FITS format. ... Introduction Integral Field Spectroscopy (IFS) is a technique to produce spectra over a contiguous 2-D field, producing as a final data product a 3-D data cube of the two spatial coordinate axes plus an additional axis in wavelength. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-27.pdf -- 76.5 Кб -- 29.05.2001
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196. http://www.adass.org/adass/proceedings/adass00/reprints/P1-29.pdf
... F. A. Primini, and H. E. Payne, eds. The ST5000: An Attitude Determination System with Low-Bandwidth Digital Imaging J. W. Percival and K. H. Nordsieck Space Astronomy Laboratory, University of Wisconsin-Madison, Madison, WI 53706 Abstract. ... The attitude determination system uses a 30-square-degree field of view and an embedded star catalog to determine the Right Ascension and Declination of its line of sight to better than 5 arcseconds. ... ST5000 Single-star Noise Equivalent Angle. exposures. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-29.pdf -- 125.6 Кб -- 29.05.2001
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197. http://www.adass.org/adass/proceedings/adass00/reprints/P1-30.pdf
Astronomical Data Analysis Software and Systems X ASP Conference Series, Vol. ... SIB pipeline flow chart. ... This class is the basis of the M&TA SIB stores information about energy bands ranges, the band name, and a pointer to functions to store the information for a the data to FITS file. ... Data Products The SIB monitor products for the ACIS instrument contain a column for each energy band defined within the input energy band definitions files as well as a time column and a flare column. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-30.pdf -- 67.9 Кб -- 29.05.2001
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198. http://www.adass.org/adass/proceedings/adass00/reprints/P1-31.pdf
... The gyro rate data minimizes the effects of noise from the star measurements, and the long-term accuracy of the star data provides a high-fidelity estimate of the gyro bias drift. ... The filter estimates 3-axis error in current attitude estimate and 3-axis gyroscope drift rate, resulting in six estimated quantities referred to as the filter "state." ... In the upper left graph, the solid line shows the actual pitch estimate error for a 500 second nominal dither observation. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-31.pdf -- 335.4 Кб -- 29.05.2001
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199. http://www.adass.org/adass/proceedings/adass00/reprints/P1-32.pdf
... The requirements for processing Chandra telemetry are very involved and complex. ... Standard Data Processing is accomplished by dozens of "pipelines" designed to process specific instrument data and/or generate a particular data product. Pipelines are organized into levels and generally require as input the output products from earlier levels. ... This complexity is captured in an ASCII processing registry which contains information about every data product and pipeline. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-32.pdf -- 71.5 Кб -- 29.05.2001
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200. http://www.adass.org/adass/proceedings/adass00/reprints/P1-33.pdf
... We have developed a format convention that allows one to specify an n-dimensional function in a FITS binary table, the FITS Embedded Function (FEF). The format allows for enumerated values, constants, and analytical functions, and arithmetic combinations of those three. ... We shall assume that if function values are requested for values of enumerated variables that fall between the enumerated grip points, the values of all enumerated columns will be interpolated linearly. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/reprints/P1-33.pdf -- 68.0 Кб -- 29.05.2001
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