Channel ops are one of the most powerful and simple tools available to you with the GIMP. ... Channel ops are operations that typically involve two images. Each channel operation compares and does some sort of manipulation based on the pixels in two images. ... Add takes two images, and adds the RGB or greyscale values of the pixels. ... If you have a completely black canvas, all the values are zero. ... This channel operation compares two images and results in the darkest values from each image. ...

... Confirm Dark Galaxy Existence . ... New evidence from NASA's Hubble Space Telescope and the Westerbork Synthesis Radio Telescope in the Netherlands has been used to rule out all but one of the ideas put forward to explain the existence of VIRGOHI 21, an intergalactic gas cloud 50 million light-years from the Earth. ... Are there more such dark galaxies out there? ... Credit: R. Minchin / Arecibo Observatory / Cardiff University / Isaac Newton Telescope / Westerbork Synthesis Radio Telescope . ...

Instrument Science Report WFC3 2004-09 Preliminary Assessment of Image Persistence in the WFC3 UVIS CCD Detector G. F. Hartig and S. Baggett 16 April 2004 ABSTRACT We have performed an initial assessment of the level of residual image persistence in the WFC3 UVIS CCD flight detectors. ... Highly saturated point source image at field point UV14 at 350 nm (left) and 100 s dark (right) at the same detector location, approximately 4 minutes later, showing no indication of image persistence. ...

... Operating at a wavelength of 10 ?m, it produces a 135њx135њ image with a resolution of 0.9њ. ... The clouds move from the west-southwest. ... At the same time as the IR images, visible light images were taken with an Apple Computer QuickTake electronic camera. ... At 1540 MDT, the large central cloud is visible in both images. At 1544 MDT, a distinctive cloud is apparent near the center in the visible image and right of center in the IR. The performance of the SDSS cloud scanner is excellent. ...

... ATNF Home . About ATNF . ... About ATNF overview . ... Governance overview . Australia Telescope Steering Committee . ... Australia Telescope User Committee . ... Our people overview . ... Publications overview . ... Murchison Radio-astronomy Observatory . ... Parkes radio telescope . ... Mopra radio telescope . ... Australia Telescope 20GHz Survey . ... Visiting Parkes radio telescope . ... Parkes radio telescope webcam . ... Some Results of an H Survey in the Taurus Dark Clouds . ...

Find Similar Abstracts . ... Large-scale distribution of matter in the universe . ... DARK MATTER, GALACTIC EVOLUTION, MASS DISTRIBUTION, UNIVERSE, GRAVITATIONAL EFFECTS, HYDROGEN RECOMBINATIONS, PERTURBATION THEORY . ... 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 ...

Swift/ XRT radiation damage and results from the lab using a proton-damaged CCD Claudio Pagani (Swift/ XRT team) XMM Calibration Meeting, Leicester, 7/3/2012 XRT CCD e2v CCD -22 detector (developed for EPIC MOS camera on XMM) Operated in Photon Counting (PC) and Windowed Timing (WT) mode 4 55Fe corner sources continuously illuminate CCD corners, used to monitor CCD performance Spectral resolution at launch: FWHM = 135 eV at Mn K- (5.9 ...

... ROTATION CURVE: When studying spiral galaxies it is invariably found that the stellar rotational velocity in the disk remains constant, or "flat", with increasing distance away from the galactic center. ... The rotation speed of the stars in galaxies is found NOT to decrease with increasing distance from the galactic center (see emission lines in the spectrum), implying that the overall mass distribution of the galaxy is different from the light distribution. ...

... Post-irradiation measurements, performed at room temperature, included dark current, flat field illumination, read noise, conversion gain, fixed pattern noise and dynamic range. ... C. Dark Current . ... Figure 4: The dark current at 25 C as a function of dose. ... In the course of measuring the noise levels, we observed that the noise level for the dark current, using the pooled variance described above, increased rapidly with integration time, far in excess of the shot noise. ... E. Alpha Spectra ...

... These are the typical steps through which a CCD image has to go. ... That process is repeated until all the pixels from the 1st line are read out. ... Figure 1: raw CCD image, obtained with a Tektronics 1024; refer to the bottom of the page for the technical details. ... The corresponding raw image presents all the defects and artifacts of the CCD and the telescope. ... These are the most basic steps; every image published should have received the following corrections. ... IfA Hale-Bopp page | ...

The study of energetic particles acceleration and transport within the magnetosphere and on its boundaries is the main goal of DOK-2 experiment on Auroral Probe in a frame of INTERBALL project. ... DOK-2 uses two pairs of energetic particle telescopes . ... This information is available only during the most informative Real Time mode of DOK-2. ... Full 56-57 channel spectra accumulated during time intervals from 10 s to 1464 s depending on a particle intensity. ... For this time interval: . ...

... GBT results . ... OOF Holography Home Page Quick Links: . ... This page contains the more recent measurements with our new OOF Holography system. ... The latest Out-Of-Focus data were taken with SCUBA on 11th February 2003. ... Aperture . ... Residuals . ... The results are summarised in the following plots: ~~available soon - see previous results page for now~~ . We have recently obtained some OOF data from the Green Bank Telescope operated by the NRAO in the US. the results are shown here. ...

SOME RESULTS FROM INTMINS . The experiment can be performed when the electron beam (instrument ISTOCHNIK ) and plasma blobs (instrument ARIEL ) are injected approximately along or perpendicular to the Earth's magnetic field. ... The pulses of frequency of 1000 Hz will generate EM waves and its harmonics. ... To increase the electron gun pulse duration up to D t = 0.5 f -1 ( D t = 5x10 -4 s) and to stabilise their frequency as good as possible. ... Back to the INTMINS Main Page ...

... Fall 2005 . Fall 2004 . Winter 2005 . Spring 2005 . Summer 2005 . Fall 2003 . Winter 2004 . Spring 2004 . Summer 2004 . Fall 2002 . Winter 2003 . Spring 2003 . Summer 2003 . ... The Swift gamma-ray burst explorer was launched on Nov. 20, 2004 from Cape Canaveral, Florida. ... A number of models describing exotic forms of matter, generically referred to as dark energy (not to be confused with dark matter), have been proposed to explain this acceleration. ...

... Moon Shadow . ... When the Moon's shadow reached out and touched the Earth last month, the result was a Solar Eclipse. ... This total solar eclipse was the last visible from the Americas for this millennium. A total solar eclipse is exciting partly because it is so short. Cracks and Ridges on Europa . ... What appears to be a caricature of a complex highway system on Earth is actually a system of ridges and cracks on the icy surface of Jupiter's moon Europa. ... Water Ice At The Lunar Poles . ...

... Next: Star Finding and Up: Image Restoration and Previous: Multiresolution and Astronomical . ... Design improvements continue to be made in the filter developed using mathematical morphology principles for the Infrared Astronomical Satellite ( IRAS ) images. The purpose of this filter is to eliminate Galactic cirrus emission from extragalactic fields. ... With an appropriate normalization, the filter curve was applied to each pixel in the image to remove the Galactic cirrus. ...

Download Izmccd (~2.7 MB). ... a) a choice of the best mode of measurements of stars and objects ("Properties/Measurement"), . b) a choice of reference stars. ... 1) necessity of presence on an image of a plenty of stars (we recommend to apply this mode, if on the frame of reference stars is more 100) . ... Sx and Sy depend from residuals at all reference stars (reference stars are marked by blue color). ... These residuals are the image of the star a minus function of a profile for each pixel. ...

... Exposure Time Calculator (ETC) . Survey processing . ... VISTA is a 4-m class wide field survey telescope for the southern hemisphere, equipped with a near infrared camera (1.65 degree diameter field of view at VISTA's nominal pixel size) containing 67 million pixels of mean size 0.34 arcsec and available broad band filters at Z,Y,J,H,K s and a narrow band filter at 1.18 micron. A wide field visible camera, if constructed, could also be used on VISTA. ... Tile . ... ESO VISTA Public Surveys . ...

Astronotes Armagh Planetarium's Stellar Blog! ... Our Galaxy . ... Stars . ... Space Flight . ... New observations with the European Southern Observatory (ESO)тАЩs Very Large Telescope of some of the most distant galaxies ever detected are revealing the mysteries of this important phase of the early Universe. ... These powerful instruments are essential for exploring this early period in cosmic history as they alone can enable the accurate observations of €аthese extremely distant and faint galaxies. ...

. English . Russian KOI8 . Current server sed.sao.ru . Dissertation of Doctor of Sciences degree ( close to German Habilitation ) . A time to cast away stones, . and a time to gather stones together . Ecclesiastes, Ch. 3 ; 5 . Full gzipped PostScript version (in Russian) is here (2005), autoreferat (short thesis in Russian) is here . Main results of dissertation work . Continue...