XMMнNewton CCF Release Note XMMнCCFнRELн12 RGS Effective Area C. Erd October 4, 2000 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS flag RGS1 QUANTUMEF 0006 1998н01н01T00:00:00 CCD DESC, SI1, SI2, SI3, SI4, SI5, SI6, SI7, SI8, SI9, RGA EFF, RGA INTERCEPT, RGA OBSCURATE --- NO RGS2 QUANTUMEF 0006 1998н01н01T00:00:00 CCD DESC, SI1, SI2, SI3, SI4, SI5, SI6, SI7, SI8, SI9, RGA EFF, RGA INTERCEPT, ... RGS-COL-CAL-00006 Page: 4 Auth.: ... 2] Jean Cottam. ...

... The WFPC2 CCDs have a small b ut significant charge transfer efficiency (CTE) problem which causes some signal to be lost when charge is transferred down the chip during readout. This has the effect of making objects at higher row numbers (more charge transfers) appear fainter than they would if they were at low row numbers. The effect depends on the temperature of the CCDs. ... It is also possible that proportional losses for fainter stars, at least with no background, may be larger. ...

... Next: The PROS Big Up: Software Systems Previous: Data Reduction Software . ... The srcinten task provides PROS users with a tool to compute count rates for point sources in the ROSAT High Resolution Imager (HRI). ... Corrected upper limits are cited at locations where the count rate falls below the source detection threshold. ... Srcinten is a new PROS task that computes and applies the above correction factors to the net counts in a user-specified aperture. ...

Colors are given essentially in the UBV system. They are : . total asymptotic colors ubt for (U-B)T . total asymptotic colors bvt for (B-V)T . effective colors ube for ((U-B)e (colors within the effective aperture in which half the total B-flux is emitted) . effective colors bve for ((B-V)e (same as for ube) Total assymptotic colors bvtc and ubtc are corrected for galactic extinction, inclination and redshift effect (see e.g. btc documentation) .

To main of Laboratory . The research work and design of optical and optical-electronic devices are carries out by laboratory staff: . ... Lens: . ... In the layout 1 prism systems perform functions of dispersive element, corrector of aberrations, optical reducer. ... Spectral range 200 - 400 nm; . ... Back Forward . ... The main corrector's function are compensation of field aberrations of the main spherical mirror of a telescope (diameter of 600 mm, f'=1200 mm) and increase aperture ratio. ...

... Then we went on to explain more in detail how to build an interaction matrix in MCAO. ... Complete lab experiments are under way at: - UVic - Durham - Lund They all want to demonstrate the feasability of MCAO, with DMs, WFSs and phase screens. ... Miska has done an experiment in the lab with SLM phase screens (liquid crystal). ... Parallelization could be desirable for ELT simulations - Collaborations possible on realization of phase screens for experiments / AO systems: - Palomar (?) ...

... One characteristic of the ATCA dishes is that they are big by 3-mm standards. Indeed van Hoerner (1967) has considered the limits to the size of an antenna before various effects become significant. ... As the ATCA dishes are twice this, it is no surprise that the ATCA antenna gain and primary beam response varies as a result of thermal distortions. ... To first order, the gain change will be calibrated out provided the phase calibrator is very close to the target source. ...

... Telescopes ћ Binoculars ћ Microscopes . Meade Ultra-High Transmission coatings (UHTC ) Group . ... Meade Standard Coatings: The optical surfaces of all Meade telescopes include high-grade optical coatings fully consistent in quality with the precision of the optical surfaces themselves. ... These specialized, and extremely advantageous, coatings are offered here as the Meade Ultra-High Transmission Coatings (UHTC) group, a coatings group available optionally on many Meade telescope models. ...

Previous Next Table of Contents . Increasing the Threshold value will have dramatic effects on the time it takes to process and image. ... Increases in Flare Intensity and Spike Points will also significantly increase processing time, although probably not as much so as the increase in Threshold. Changing the Spike Color from white to either background or foreground will increase the time to process the image, but the increase is not significant. ...

ALMA | ... In this section, we explain why we need to correct phase fluctuations and ALMA's strategy to do this. Rapid fluctuations will be corrected with water vapour radiometers (WVRs). The Cavendish Astrophysics Group was also a leading contributor to the ALMA prototype WVRs, which were put through their paces in tests at the Submillimeter Array (SMA). ... The Cavendish Astrophysics Group in partnership with the Onsala Space Observatory built two prototype WVRs for the ALMA project. ...

... Stellar magnitudes, provided by observations in an optical band, are reduced to the units of erg/cm /s as follows: . ... Table: `Zero-points', central wavelengths, and effective widths of optical bands (Zombeck's Handbook, 1990). - the corrected value (the handbook value is given in parentheses). ... We have achieved coincidence between theoretical values by Bochkarev et al (1991) and ours, obtained with rectangular shapes of transmission band of optical filters. ... 1991, V. 1, P. 41. ...

... An exposure map is provided for each ROSAT field (e.g., rp110590_mex.imh). The simplest method of applying an exposure correction is to divide the data by the exposure map yielding a count rate image. The image must first be blocked to the same size as the exposure map, e.g., for ROSAT PSPC. xi> imcalc input file (`-' for STDIN) or imcalc commands () : - # interactive mode IMC > ctrate.imh = ``xdata$rp110590.qp[bl=30]'' / ``xdata$rp110590_mex.imh'' IMC > quit . ...

... The behaviour of the polarization efficiency (see Eq. ( 14 )) for non-absorbing and absorbing spheroids is shown in Fig. 11 for the case when a maximum polarization is expected (PF alignment, ). ... Figure 11: Polarization efficiency against for prolate and oblate spheroids with and , picket fence orientation, . The size/shape effects are illustrated. ... Figure: Polarization efficiency as a function of particle equivolume radius for prolate core-mantle spheroids with and , PF orientation, . ...

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Processing the "Face on Mars" Images . ... Contrast Enhancement . ... Image Processing of Images of the "Face on Mars": A Cautionary Tale . ... In the figures below, the general flow of processing for Viking Orbiter data is outlined, illustrated with the best two images of the "Face"(Figure 1). ... Figure 1: Raw (top) and contrast-enhanced raw (bottom) enlargements of 035A72 (left) and 070A13 (right). ... Figure 3: Increasing the contrast of the "face" images (035A72 (left) and 070A13 (right)). ...

Processing the Viking Orbiter Images . ... Contrast Enhancement . ... Image Processing of Images of the "Face on Mars": A Cautionary Tale . ... In the figures below, the general flow of processing for Viking Orbiter data is outlined, illustrated with the best two images of the "Face"(Figure 1). ... Figure 1: Raw (top) and contrast-enhanced raw (bottom) enlargements of 035A72 (left) and 070A13 (right). ... Figure 3: Increasing the contrast of the "face" images (035A72 (left) and 070A13 (right)). ...

home education . SEARCH ASP SITE: Match ALL words Match ANY word . ... SEED Grants to Scientists . ... The ASP SEED Grant program supports the ASP's mission to advance science and science literacy through astronomy by encouraging active researchers to engage in public outreach, K-14 formal education, or informal education programs or activities. ... Development, use, and dissemination of a well-illustrated college-level presentation on a specific topic or problem in current research . ... search . ...

... ON THE ROLE OF LARGE-SCALE PLASMA IRREGULARITIES AT THE FINAL STAGE OF ANOMALOUS ABSOPTION DEVELOPING UNDER HF HEATING OF THE IONOSPHERE . ... Fig. ... With the aid of numerical statistical modeling based on multiple ray tracing it is shown that in presence of large-scale irregularities the reflected signal amplitude mean value is increased significantly. ... Dependence of the mean amplitude of the reflected from the ionosphere signal on the large-scale (10-50 km) electron density irregularity level...

TOWARDS SUPERSENSITIVE BOLOMETERS AND ELECTRON COOLERS BASED ON CARBON NANOTUBES M.TARASOV, J.SVENSSON, S.DITTMER, L.KUZMIN, AND E.CAMPBELL Chalmers University of Technology, GЖteborg SE 41294, Sweden E-mail: Mikhail.tarasov@mc2.chalmers.se Carbon nanotubes (CNT) are being intensively developed for novel electronics. Electron cooling by superconductor-insulator-nanotube (SIN) tunnel junctions could be extremely effective due to the small volume of the CNT. ...

... For every level we have plotted the dependence between width and Lande factor and obtained the linear regression parameters: the inclination, the zero Lande factor line width and the correlation. ... Fig. 1. presents a model components, the intensity of which decreases (b) line with 10 and increases (c) to the center of spectral line (the field is 12 k6s). ... Our results show strong dependencies of line width on the level of width measurements. ...