Next: The Clark CLEAN Up: Image Deconvolution Previous: Introduction . The CLEAN algorithm (H?gbom 1974) (A&AS 15, 417) represents the image as a number of point sources in an otherwise empty field of view. ... The H?gbom CLEAN algorithm looks for the brightest (in an absolute sense) pixel (called a CLEAN component) in a specified region in the image (called the CLEAN window which must include all the real emission in the image). ... This subtracted image is called the residual image. ...

Next: To produce a region Up: Image Display in Xwindows Previous: General usage. ... Menu items are chosen by clicking any mouse button (cf. ... save current cursor as an include region (counts within region will be included in subsequent calculations) . ... When another image is displayed, the earlier one can be compared with it by pressing its respective mouse button with cursor in the main display window. ... Table 1: Detailed list of menu options . ... color . ... enter/leave region sub-menu . ...

... Bojan Nikolic web pages (r. 329) . ... The HУЖgbom ?CLEAN? is a simple algorithm for deconvolving images, that is, it is an algorithm to remove to an extent the smearing in an image due to a finite point-spread function. This algorithm is particularly applicable to making images from radio aperture synthesis array telescopes, where this algorithm (and other closely related) are the standard deconvolution approach. ... Copyright 2005 -- 2016, Bojan Nikolic feedback welcome ...

... Please note that throughout this exercise you need some patience since the PEARL procedures use the Direct Fourier Transform which is quite slow for the size of map we are trying to work with! . ... Initial chisq= 24.980139 . SVD: will edit 0 singular values! ... Click Update to add the selected number of CLEAN component to the current model (which was empty at the start), self-calibrate the phases, subtract the CLEAN components from the data, and re-display the updated residual and final maps. ...

... Previous: ESO C Library for an Image Processing Software Environment (eclipse) . ... A new CLEAN-type algorithm searches for model components not in the dirty image but in the multi-resolution wavelet transform of the dirty image based on the dirty beam. ... The improvement of this prototype Wavelet CLEAN, which does convolve with the dirty beam, can be attributed to a suppression of noise and aliasing in the dirty image by use of information in the sidelobes of the whole image domain. ...

... GPI Data Pipeline 1.0 documentation . GPI Data Pipeline Developer?s Guide . Enter search terms or a module, class or function name. Pipeline Code Internal Organization . ... Function Call Hierarchy when Running Recipes . ... The GPI data pipeline is implemented in object-oriented fashion using IDL classes. ... For detailed documentation on the functions and variables internal to the following, please see the comments in the source code directly. ... The main object class of the pipeline! ...

XMM­Newton CCF Release Note XMM­CCF­REL­0103 EPIC MOS Spectral Response Distribution D Lumb January 8, 2002 1 CCF components Name of CCF VALDATE List of Blocks changed CAL VERSION XSCS flag EMOS1 QUANTUMEF 0009.CCF 2000­01­01 QE CCDn NO EMOS2 QUANTUMEF 0009.CCF 2000­01­01 QE CCDn NO 2 Changes In previous versions, the CCD efficiency was defined within a region described by a POLYGON function. The selectlib functionality can cause some inconsistency at the borders of such a region. ...

... In this first example, we allow an object to fall onto a small radar unit . The resulting Time-Frequency distribution is shown as a contour plot in Fig. 8 (a). Figure: FIGURE GOES SOMEWHERE IN THIS GENERAL VICINITY . ... Its density plot appears as an image in Fig. ... The response has a very high peak, as evidenced from Fig. ...

Next: Data Structures Up: Multi-Object Spectroscopy Previous: Fitting the dispersion . DEFINE/MOS helps you to localize your objects and sky regions and by default works automatically. ... In the averaged frame it tries to detect objects above the threshold ( ) within the search window and fits a gaussian to any detected object. ... SET/MOS def_mode=i . ... It may be advisable to do at least a rough sky subtraction ahead of this command to facilitate the detection of the objects. ...

... It was shown in the early 1980's that spectral lines formed around 1-2.5 x 10 5 K were enhanced in radiance by factors up to 15-25 over the normal quiet Sun. From the dynamical viewpoint, this would suggest a pressure imbalance between the sunspot and the surrounding region. ... Here, the electron density was evaluated over a bright sunspot plume region using lines within the O V 760? multiplet. ... The derived densities in all four regions are indicated. ...

... TROUBLE SHOOTING AT THE TELESCOPE . ... This can be caused by two things: . ... To fix, just type "disc on". ... To see if this is your problem, go to some other window on observer and type "df -k /export/obs8". ... This may be caused by you having typed either a square or curly bracket ([ or {) on the datataking window. ... To fix, go into the "datataking" window and type "pnt tol 10.0" to reset the pointing tolerance to 10 seconds. "aog generic if1Prog@da err" error when sourcing your set-up file ...

... Dwarf Galaxies in the Coma Cluster . ... In visible light images, over a thousand galaxies are seen to lie within a volume about 20 million light-years across in the rich Coma Galaxy Cluster. But infrared images of the Coma Cluster have now been used to add thousands more to the Coma's galaxy count in the form of previously undiscovered dwarf galaxies. ... The Hubble Space Telescope has resolved individual stars in a spectacular new image of nearby spiral galaxy M81. ... The Horsehead Nebula . ...

... JavaScript 1.1: added current, next, and previous properties. ... To change a window's current URL without generating a history entry, you can use the Location.replace method. ... For example, if the history list contains three named entries, these entries are reflected as history[0] , history[1] , and history[2] . ... back . ... onClick="history.go('home.netscape.com')"> The following button navigates to the URL that is three entries backward in the history list: <P><INPUT TYPE="button" VALUE="Go" ...

Next: Roche lobe overflow (stage Up: Principal Evolutionary States of Previous: Main-sequence stars (stage I) . ... The duration of this stage for a binary component is no longer a function of the stellar mass alone (as in the case of single stars), but also depends on the initial binary type (A, B or C) (Iben and Tutukov, 1985, 1987[ 74 , 75 ]): . The radius of the post-MS star rapidly increases (on a thermal time-scale)   and reaches characteristic giant values. ...

... A Front of line M-G Goto a line ^E End of line ^N Next line M-N Front of paragraph ^P Previous line M-P End of paragraph ----------------------------------------------------------------------------- = (2) DELETING INSERTING -- Delete previous character ^D or DELETE Delete next character ^C or INSERT Insert a space M- -- Delete previous word M-D Delete next word ^K Close ( ... The KILL BUFFER is the text which has been most recently saved or deleted. ...

... Lagoon Nebula, Trifid Nebula and the NGC 6559 Complex – Negative Image . This negative view of the previous image highlights the dark nebulas in the region. Same acquisition data as the previous image: 5nm Hydrogen-alpha filter, Total= 48 minutes, 8 x 360-second unbinned sub frames. Takahashi Epsilon -180 – f/2.8, SBIG STL6303E CCD camera, ATMoB Clubhouse, Westford, MA. ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

. Small black points show all QSOs known previously before the start of this survey. | Front page | . | << - Survey description objectives | . Robert J. Smith, ">rsmith@mso.anu.edu.au Last modified: Fri Sep 24 11:39:02 EST 1999 .

Polycyclic aromatic hydrocarbons in HII regions: correlation with metallicity . ... We have perfomed the aperture photometry of HII regions using infrared images from telescopes Spitzer and Herschel at passbands 3.6, 4.5, 5.8, 8.0, 24, 70 and 160 m. Emission of PAHs are observed at passbands 3.6 - 8.0 m, 24 m is emission likely of hot small particles and finally large particles are responsible for emission at 70 and 160 m. We determine abundances of PAHs using model of Draine Li (2007) . ...

... 1994: . As a result of comparing the spectra of active solar regions from the observations with high spatial resolution in the microwave range at the RATAN-600 (the S-component) with a flare component observed at meter wavelengths on the VLA (USA) we revealed the presence of a strong and prolonged noise storm exactly where a weak decaying active region (with the presence of powerful active regions in the disk) is located. ... Archive . ...

... There are number of features that can be set by the user in the Sparkle Dialog box. ... The Sparkle plug-in computes the luminosity (level of whiteness) of each pixel in the image (the user can see this when the progress window labeled Generating luminosity array... is displayed). ... The threshold value is currently a slider/text field pair which have a precision of .0001. ... Like the Threshold value, the Flare Intensity has both a slider and a text input field for specifying its value. ...