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881. The Chandra Automatic Data Processing Infrastructure
... 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. ... The Automatic Processing system (AP) polls its input directories for raw telemetry and ephemeris data, pre-processes the telemetry, kicks off the processing pipelines at the appropriate times, provides the required input, and archives the output data products...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-32/ -- 14.0 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-32/P1-32.html -- 14.0 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-32/P1-32.html -- 14.0 Кб -- 29.05.2001
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882. Kalman Filtering in Chandra Aspect Determination
Next: The Chandra Automatic Data Processing Infrastructure . ... This is done with a Kalman filter and Rauch-Tung-Striebel (RTS) smoother, which are key components of the overall aspect solution software. ... The schematic shown in Figure 1 illustrates the basic flow of the Kalman filter design for Chandra aspect determination (Gelb 1974, TRW Memorandum 1996). ... Figure 1: Chandra Aspect Kalman Filter Schematic. ... The filter alone is not able to use future data to produce estimates. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-31/ -- 13.0 Кб -- 29.05.2001
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883. An Object Oriented Design for Monitoring the Chandra Science Instrument X-ray
Next: Kalman Filtering in Chandra Aspect Determination . ... The Science Instrument (SI) background monitoring is one such thread that is designed to compile a temporally and spatially ordered table of the observed flux and energy spectrum in detector coordinates. ... As part of the M&TA System (Wolk et al. 2000) the SI Background (SIB) monitoring thread is based on C++ tools designed with object oriented design methodologies that provide flexibility for generating SIB maps. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-30/ -- 14.4 Кб -- 29.05.2001
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884. The ST5000: An Attitude Determination System with Low-Bandwidth Digital Imaging
... The Space Astronomy Laboratory is building an attitude determination and digital imaging system with embedded compression. 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 5arcseconds. ... The ST5000 can determine its attitude with respect to an absolute coordinate system (say, FK5 Equatorial) by analyzing the star patterns in a single frame. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-29/ -- 14.0 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-29/P1-29.html -- 14.0 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-29/P1-29.html -- 14.0 Кб -- 29.05.2001
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885. IFU Data Products and Reduction Software
... P.O. Box 26732, Tuscon, Arizona, 85726-6732, U.S.A. We present a summary of the current status of Starlink and UK data reduction and science product manipulation software for the next generation of IFUs, and discuss the implications of the currently available analysis software with respect to the scientific output of these new instruments. ... We also examine the competing science product data formats, and discuss the conventions for representing the data in a multi-extension FITS format. ... Format...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-27/ -- 16.5 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-27/P1-27.html -- 16.5 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-27/P1-27.html -- 16.5 Кб -- 29.05.2001
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886. The VIMOS Mask Preparation Software
Next: IFU Data Products and Reduction Software . ... To fully exploit such a potential a dedicated tool, the VIMOS Mask Preparation Software (MPS), has been designed. The MPS provides the astronomer with tools for the selection of the objects to be spectroscopically observed, including interactive object selection, handling of curved slits, and an algorithm for automatic slit positioning that derives the most effective solution in terms of the number of objects selected per field. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-26/ -- 18.1 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-26/P1-26.html -- 18.1 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-26/P1-26.html -- 18.1 Кб -- 29.05.2001
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887. Automated Spectral Extraction for High Multiplexing MOS and IFU Observations
... The distinguishing characteristic of VIMOS is its very high multiplex capability: in MOS mode up to 800 spectra can be acquired simultaneously, while the Integral Field Unit produces 6400 spectra to obtain integral field spectroscopy of an area approximately 1 1 arcmin in size. ... Figure 1: A block diagram scheme of the DRS spectral extraction process . ... The extraction itself is carried out following two different procedures for MOS and IFU observations. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-25/ -- 14.8 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-25/P1-25.html -- 14.8 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-25/P1-25.html -- 14.8 Кб -- 29.05.2001
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888. SLIM: A Program to Simulate the ACS Spectroscopic Modes
... Previous: The Sliding-Cell Detection Program for Chandra X-ray Data . ... SLIM is a program developed at ST-ECF to simulate direct and slitless spectroscopic images. ... SLIM produces slitless spectroscopy simulations which include the effects of geometric distortions, fringing, and the field-dependence of the spectral dispersion. ... A slitless spectroscopy simulator was required to create realistic data of the upcoming Advanced Camera for Surveys (ACS) slitless spectroscopic modes. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-24/ -- 12.7 Кб -- 29.05.2001
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889. The Sliding-Cell Detection Program for Chandra X-ray Data
Next: SLIM: A Program to Simulate the ACS Spectroscopic Modes . ... Previous: On the Fly Bad Pixel Detection for the Chandra X-ray Observatory's Aspect Camera . ... We here present an overview of Celldetect , a source detection program for Chandra. ... Celldetect identifies point sources in the presence of background. ... At each point where a detection is attempted, celldetect uses an appropriately sized cell. ... The background statistics in celldetect change as the cell size increases. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-23/ -- 13.0 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-23/P1-23.html -- 13.0 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-23/P1-23.html -- 13.0 Кб -- 29.05.2001
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890. On the Fly Bad Pixel Detection for the Chandra X-ray Observatory's Aspect...
Next: The Sliding-Cell Detection Program for Chandra X-ray Data . ... The Chandra X-ray Observatory uses an optical CCD in its aspect camera. ... This ``on the fly'' determination allows us to adjust for variations in CCD conditions between dark current calibration observations and provides useful information for identifying bad regions on the Aspect camera CCD. ... As the aspect camera CCD is exposed to radiation, warm pixels will develop. ... Chandra's Aspect camera detector is a pixel CCD. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-22/ -- 14.0 Кб -- 29.05.2001
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891. The Chandra X-ray Observatory PSF Library
Next: On the Fly Bad Pixel Detection for the Chandra X-ray Observatory's Aspect Camera . ... Using these models we have produced a set of simulations of the Chandra point spread function (PSF) which is available to the users via PSF library files. ... The image pixels indicate the number of counts used for each PSF image. ... High resolution library (I) with a step of 1 arcminute between images: contains 1$$m pixel images covering a 1 to +1 arcminutes grid (3 3) about the optical axis. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-21/ -- 18.1 Кб -- 29.05.2001
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892. Deconvolution of ``Drizzled'' and Rotated HST/WFPC2 Images: Faint-object
... We have further adapted our deconvolution-based HST/WFPC2 reduction techniques, which our simulations have shown to be very effective in crowded fields (Butler 2000), to take advantage of the extra resolution afforded by ``dithered'' observations. ... We therefore believe that deconvolution of ``drizzled'' and rotated images ( 2 spacecraft roll angles) is the optimal way to detect and measure faint objects in crowded fields imaged with HST, and we recommend such an observing strategy. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-20/ -- 16.9 Кб -- 29.05.2001
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893. HST NICMOS Residual Bias Removal Techniques
Next: Deconvolution of ``Drizzled'' and Rotated HST/WFPC2 Images: Faint-object Photometry in Crowded Fields . ... HST NICMOS detectors suffer from temporal bias drifts, which lead to incomplete bias subtraction during image calibration. The residual bias signal is spatially constant, so that application of flatfield images during calibration gives rise to an imprint of the flatfield structure. ... Changes in bias between readouts are left as residual signal in the subtracted images. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-19/ -- 16.8 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-19/P1-19.html -- 16.8 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-19/P1-19.html -- 16.8 Кб -- 29.05.2001
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894. Parallelization of Widefield Imaging in AIPS++
Next: Ionospheric Corrections in AIPS++ . ... Previous: AIRY: Astronomical Image Restoration in interferometrY . ... Calculate residual images for all facets (using 2-D transforms). Partially deconvolve individual facets and update the image model for each facet. ... The image in Figure 1 was made using the AIPS++ widefield algorithm with 225 facets. ... In calculating the residual image the residual visibility re-projection for the different facets can be estimated independently. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-13/ -- 11.6 Кб -- 29.05.2001
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895. AIRY: Astronomical Image Restoration in interferometrY
... Correia, S., Carbillet, M., Fini, L., Bertero, M., Boccacci, P., Vallenari, A., Richichi, A., & Barbati, M. 2001, in ASP Conf. ... AIRY is a modular software package designed to simulate optical and near-infrared interferometric observations and/or to perform subsequent image restoration/deconvolution. ... Bertero, M., Boccacci, P., Correia, S., & Richichi, A. 2000, in Interferometry in Optical Astronomy , ed. P. J Lena & A. Quirrenbach, SPIE 4006, 514 . ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-12/ -- 13.5 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-12/P1-12.html -- 13.5 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-12/P1-12.html -- 13.5 Кб -- 29.05.2001
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896. New Tools for the Analysis of ISOPHOT P32 Mapping Data in PIA
... Previous: Uniform Data Sampling: Noise Reduction & Cosmic Rays . ... The Infrared Space Observatory AOT P32 is a dedicated mapping mode combining the raster capability of ISO with the chopping capability of the ISOPHOT instrument for obtaining images in the far infrared, maximising the spatial resolution. We present diffraction limited maps of the Crab Nebula at 60 and 100 m, as an illustration of a new tool for the P32 data analysis, integrated within the ISOPHOT Interactive Analysis (PIA). ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-11/ -- 17.3 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-11/P1-11.html -- 17.3 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-11/P1-11.html -- 17.3 Кб -- 29.05.2001
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897. A System for Web-based Access to the HSOS Database
... 238, Astronomical Data Analysis Software and Systems X, eds. F. R. Harnden, Jr., ... Web-based access to the data will provide a powerful, convenient tool for data searching and solar physics. ... The system will be generated by PHP and MySQL. ... Given the large amount of data, and that the data is not only plain text but also image file, visual file, we select a relational database--MySQL--to build the database management system, and use PHP to build the database engine and user query interface. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-09/ -- 11.0 Кб -- 29.05.2001
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898. Pile-up on X-ray CCD Instruments
... Ballet, J. 2001, in ASP Conf. ... The underlying hypothesis is that an event is due to only one X-ray. ... The charge from an X-ray may either concentrate in one pixel (single events) or appear over several adjacent pixels (split events) forming a specific pattern or grade. ... I have shown (Ballet 1999, Equations 1-3 and A5) that for strict (0) and generalised (30) single events (using the above notations), assuming a (locally) uniform X-ray flux, i.e., a pixel size small with respect to the PSF: ....
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-06/ -- 27.6 Кб -- 29.05.2001
[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-06/P1-06.html -- 27.6 Кб -- 29.05.2001
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[ Сохраненная копия ] Ссылки http://www.adass.org/adass/proceedings/adass00/P1-06/P1-06.html -- 27.6 Кб -- 29.05.2001
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899. Projective Transform Techniques to Reconstruct the 3-D Structure and the
... Polar plumes appear in images of the Sun's corona as faint linear enhancements in radial directions emanating from the North and South polar regions during the period of minimal solar activity. ... What are polar plumes? ... Even if plumes seems to be in rigid body rotation with the solar magnetic field, classic inversion with Radon transform is unable to reconstruct such 3-D structure due mainly to transient phenomena. ... We address points 2) and 3), solved with projective techniques. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-04/ -- 16.8 Кб -- 29.05.2001
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900. Correction of Systematic Errors in Differential Photometry
... A common cause of errors in CCD differential photometry is an improper calibration of the array. ... Figure 1: Differential photometry as a function of the position on the CCD for three stars in a field observed with the University of Bochum 0.6m telescope at the ESO La Silla observatory. ... These variations are quite different from star to star. ... Differential data computed between widely separated stars can show errors of up to about 0.1 mag when a night-sky superflat correction is applied. ...
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Ссылки http://www.adass.org/adass/proceedings/adass00/P1-03/ -- 16.3 Кб -- 29.05.2001
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