Next: Hierarchical Wiener filtering Up: Noise reduction from Previous: The convolution from . Let us consider a measured wavelet coefficient at the scale i . We assume that its value, at a given scale and a given position, results from a noisy process, with a Gaussian distribution with a mathematical expectation , and a standard deviation : . ... We get: . ... This is done from the study of the variation of the noise between two scales, with an hypothesis of a white gaussian noise; . ...

The computed band passes. ... The interim correlator input is filtered by 8 analog filters (50 Mhz wide at the 260 Mhz IF... one for each sub correlator). ... For bandwidths of 25 Mhz and below the real data stream is digitally down converted to complex samples I, Q streams. ... The Top figure is the halfband filter bandpass computed from the filter coefficients. ... The computed filter has aliased power, extra IQ filtering, and two applications of the filter on the resulting real bandpass. ...

... The errors associated with several of the pipeline corrections will not manifest themselves until data from individual visits are compared via the plate overlay process. ... The locations of the individual reference stars on each plate determine how to map the data from that visit onto the common master plate. ... The rms residuals of the fit, referred to as the plate overlay residuals , can be as small as 1 mas or as large as 6 mas. ... POSITION Mode Corrections and Errors . ...

scripts · Made a comparison with SCISIM ray trace that replicates each observation Main Analysis Steps · Select regions for each camera and run esas · Extract spectra and background · Made an . arf that is a guess for typical off axis angle ( fn(E) knowing only a single reflection occurs ) · Assume source spectrum of a LMXRB e.g. const*phabs*(diskbb+comptt) probably the detailed spectrum doesn't matter to 1st order · Also require an ...

HI source finding algorithms Comparing the general purpose Duchamp algorithm to a purpose built HI source finding algorithm Talk Outline · Common elements of source finding algorithms · The Duchamp algorithm · · · · Algorithm Strengths Draw-backs Improvements · An alternative HI source finder algorithm · Key differences · Algorithm · Preliminary work · Conclusion Common elements of general ...

The above image is a computer simulation of the distribution of mass in a Dark Matter dominated Universe. ... Structure (\eg density enhancements) clearly forms at the intersection of these filaments. ... What is Dark Matter? ... Testing for the presence of dark matter in the solar neighborhood now becomes an accounting problem The possible sources of this mass in the solar neighborhood are 1) luminous stars, 2) interstellar gas, 3) stellar remnants (mostly white dwarfs) and 4) dark matter: . ...

... 30, 2006 . ... If you retrieve these files via a Web browser, please note that you need to use the browser's "Save As..." facility. ... Figures must be provided as Encapsulated PostScript files and should be incorporated in your contribution using the standard Latex2e "graphicx" package as demonstrated in the demo file author.tex. ... Please submit the LaTeX source file of your contribution, and PostScript/PDF files of any figures, via email (!!!) to Iris Bronnert ( ibronner@eso.org ). ...

This document contains a summary of the user interface for filtering rows in binary tables. Table filtering allows a program to select rows from an table (e.g., X-ray event list) by checking each row against one or more expressions involving the columns in the table. When a table is filtered, only valid rows satisfying these expressions are passed through for processing. ... select rows whose pha value is exactly 10 . ... 10 pha select rows whose pha value is in the range of 10 to 50 . ...

... This gives a nice opportunity to check the quality of the FIRPO photometry against that of TIRGO. ... The values are Program POLYFIT V 10/Jul/90 ( A.Richichi ) - 24-Aug-1997 13:38:25 File : diff_temp_jc.dat Pol. degree: 1- N = 10- [ 2786.00- 4095.00 ] - [ 0.00- 1194.00] 1 -.10304E+01 0.26412E+00 2 0.29958E-03 0.74406E-04 sdev: 0.16063E+00 chi2 :0.24486E+01 Program POLYFIT V 10/Jul/90 ( A.Richichi ) - 24-Aug-1997 13:42:59 File : diff_temp_hc.dat Pol. degree: 1- N = 10- [ 2786.00- ...

... Following the full moon on Monday, March 24, I was able to make use of a few brief periods totalling about an hour and a half before the Easter weekend to make some 160 galaxy observations at home in Coonabarabran using the 0.41m telescope. ... Because of being on holidays my resources for comparison purpouses were rather limited, and so I had to rely upon amateur contacts in Queensland to verify my memory of this galaxy, and also to obtain visual confirmation of the supernova. ...

... 172 ] Briefly, the count rate at the detector from a source at a redshift z is . ... Figure 55 shows the ``Green functions'' for the double compact binary merging rate   evolution assuming no collapse anisotropy. ... Another way that diverse peculiarities in the - distribution induced by the sources evolution could arise is connected with a possible non-monotonic character of the star formation rate in galaxies. ... 22 ] Figure  56 shows two-dimensional cuts through the parameter space. ...

Not on-site at APO, but can be obtained on loan--contact Jeff Morgan at UWash, morgan/astro.washington.edu . CENTER( ) PASSBAND( ) NEBULAR LINE (OR CONTINUUM) . 4861 60 Hbeta 5007 60 [O III] 6301 10 [O I] -- [S III]6312A line is supressed 6563 10 Halpha -- [N II]6584 and 6583 lines are suppressed 6583 10 [N II] -- Halpha line is suppressed 6728 80 [S II]6717+6731 4686 60 He II 4760 100 blue cont or Fe II 8290 195 red cont. See also the Hodge filter set below. ... APO Filters Homepage ...

The build the executables: make To install the executables and set_camera_filter link in /usr/local/bin/ make install To uninstall the executables make uninstall To use the IFW filter wheel from within xmccd, you need to specify an external filter wheel option in the configuration file by setting ccd.filter_wheel = 1 in prefs.ccd By default, XmCCD will try to automatically configure an SBIG filter wheel on SBIG cameras, or follow a configuration file directive. ...

... After the edit, recompile the kernel and recompile the Apache server then reboot. ... If you're running a really busy BSD Apache server, the following are useful things to do if the system is acting sluggish: . ... Maximum # of processes . ... This machine is a server that handles lots of traffic, # so we crank that value. options NMBCLUSTERS=4096 # mbuf clusters at 4096 # # Misc. options # options CHILD_MAX=512 # maximum number of child processes options OPEN_MAX=512 # maximum fds (breaks RPC svcs)...

... The European HST Archive has been moved to ESA's European Space Astronomy Centre ( ESAC ), Spain, where most of ESA's Space Science Archives are located and operated from. ... The Space Telescope European Coordinating Facility (ST-ECF), jointly operated by ESA and the European Southern Observatory ( ESO ) was, until the end of 2010, the European HST science facility, supporting the European astronomy community in exploiting the research opportunities provided by the Hubble Space Telescope. ...

... 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. ...

Next: Feature enhancement: normalizing Up: No Title Previous: Feature enhancement: pulsing . The inverse transform is at the core of the best known applications of wavelets: data compaction and numerics. ... Two applications fall within our scope: filtering and denoising. Filtering consists of using only a portion of the wavelet map in the inverse transform process, masking out certain durations. ... Figure 23: Filtered reconstruction of the intermittent signal. ...

Astronomy Picture of the Day . Sun vs Super Moon . ... To make it, the Full Moon on May 6 was photographed with the same camera and telescope used to image the Sun (with a dense solar filter!) on the following day. ... And for some the New Moon will be surprisingly easy to compare to the Sun, because on May 20 the first solar eclipse of 2012 will be visible from much of Asia, the Pacific, and North America. ... Publications with keywords: full moon - perigee - apogee - solar eclipse . ...

... commands . ... data_spectrum <name> : data in "spectrum" format . ... Repeat command to add additional mask regions. sigma is the s.d. to apply to the data within the region to be masked. ... Repeat command to add additiona continuum regions. ... cont_reg_clear : Clear current continuum regions . ... The observed spectrum is then multipled by this filter to obtain a new spectrum for use by SFIT. cont_sigma : Computes standard deviation of data in continuum regions and applies it to current data . ...

... Problem 5. ... See figure 1 for the light curve of these narrow Nitrogen lines. ... Figure out the behaviour of each parcel of gas, and then add them all up to find the light curve. 5.4 (3pts) Using expression from problem 5.2, derive the expression for the time after SN explosion date, when the first light from the ionised ring reaches Earth. Using the expression from problem 5.2, derive the expression for the time after SN explosion date when the maximum brightness of the ring occurs. ...