... Gravitational wave detection Timing residuals = unmodelled physical effects Spin-down irregularities No angular signature CSIRO. Gravitational wave detection Time standards · Most pulsar observations referred to TT(TAI) · Post-corrected time standard TT(BIPM2010) can be used · Requirement to fit for the pulsar's period and first derivative => a quadratic must be removed from the expected clock errors CSIRO. ... Simulate 10x expected TAI-TT(BIPM2010) in real pulsar data 5s CSIRO. ... CSIRO. ...

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• http://www.atnf.csiro.au/research/Astro2008/Postings/Daniel_Yardley.pdf
• PPTA Wiki | Projects / RedGW

Next: Star Formation Rate and Up: No Title Previous: Calculation of Evolutionary Tracks . To start calculations, we choose the distributions of the initial binary parameters: the mass of the primary ZAMS component, , binary mass ratio, , orbital separation a . ... whereas the mass ratio distribution is not. ... The zero assumption often made is that the mass ratio distribution has a flat shape, that is binaries with a high mass ratio occur as frequently as those with equal masses. ...

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• Gravitational Waves from Coalescing Compact Binary Stars
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... Changing Programs & Resolving Problems . ... Several factors first came to mind that might explain what was seen. ... However, such changes cannot also explain the changes seen in the stellar spectra, and again this hypothesis was initially rejected. A drift of the spectrum on the diode array could lead to a decrease in observed flux over time. ... As mentioned previously, a significant change should also lead to a drop in the spectrum at one end relative to the other, and that is not seen. ...

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• Merits

... Girls from Scoil Rince Emain Macha and choreographer Lorraine Scallon provided a moving astronomy-inspired dance at the opening of the John Hewitt Summer School at the Market Place Theatre, Armagh, on Monday 26 July. The highly acclaimed performance was part ofб "OASES", a cross-border and cross-community initiative that uses science and the arts to bring people from different backgrounds and different communities together. ... Nowadays Science and Arts are completely separate worlds. ...

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Astronomical Data Analysis Software and Systems X ASP Conference Series, Vol. ... We here present an overview of Cel ldetect, a source detection program for Chandra. ... The size of the cell is chosen to be some large fraction of the Point Spread Function (PSF) size. ... These are subtracted from the cell counts. ... Cel ldetect starts analysis with a 2048 в 2048 unblocked "window" at the cen- Sliding-Cell Detection Program for Chandra Data 445 PSF Limit Cell 2k x 2k Window Detector Edge Figure 3. ...

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• A Method for Minimizing Background Offset Errors When Creating Mosaics
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... 2009 September 21 . Abell 370: Galaxy Cluster Gravitational Lens . ... While imaging the cluster of galaxies Abell 370, astronomers had noted an unusual arc to the right of many cluster galaxies. ... In the mid-1980s, however, better images allowed astronomers to identify the arc as a prototype of a new kind of astrophysical phenomenon -- the gravitational lens effect of entire cluster of galaxies on background galaxies. ... About APOD | ...

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• APOD: December 20, 1995 - A Galaxy Gravitational Lens
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... In most astronomical observations the image intensity consists of contributions from both object and sky background. Depending on the complexity of the field and the type of object, different methods are used to estimate and subtract the background intensity. ... Non--linear filters are often used to remove stellar images and other sharp features (see Section ) while extended objects are very difficult to eliminate automatically. ...

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... RJMCMC Similar to Richardson Green 1997 Knowledge of the PSF makes things easier Insensitive to e.g. posterior for ten sources with = 3: Number of Components 9 10 11 12 0.141 0.222 0.220 0.157 0.022 0.029 0.027 0.021 Mean SD 7 0.029 0.018 8 0.058 0.019 13 0.082 0.014 Simulated Data Source region (2 SD) is about 28% of the area and contains about 41% of the observations Positions (-2, 0), (0, 1), (1.5, 0) with intensities ... Approximate the number of sources (2 in this case) 2. ...

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. Previous slide . Back to first slide . View graphic version .

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• Algorithm
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... Does the time it takes different methods to create all the elements coincide with the universeт??s accepted age? ... Illinois Urbana-Champaign) Different kinds of stars create elements at different rates, all of which are consistent with the age of the universe. Get instant access to subscriber content on Astronomy.com! ... Registration is FREE and takes only a few seconds to complete. If you are already registered on Astronomy.com, please log in below. ...

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• Why do some stars appear to flash a variety of different colors when you look
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• Magnetic fields, subatomic particles, etc., traveling in different directions

T he Siding Spring Survey (SSS) is a Near-Earth Object search program that utilises the 0.5-m Uppsala Schmidt Telescope at Siding Spring Observatory, N.S.W., Australia. ... The mission of the Siding Spring Survey is to contribute to the inventory of near-earth objects (NEOs), or more specifically, the potentially hazardous asteroids (PHAs) and comets (PHOs) that may pose a threat of impact and thus harm to civilization. ... Based on the CSS Mission page . ... Siding Spring Survey Main Page . ...

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• University Problem Based Learning Exercises for Teaching Astronomy and Physics

Detection technique . We are using ISIS , the optimal image subtraction method developed by C. Alard & R.H. Lupton, to search for SNe in our images. ... The second image shows the same subtraction, but after the convolution of the best image with ISIS: . ... For this reason, we are suggested to search for nuclear SNe with NICMOS on HST, to exploit its stable PSF, sensitivity and angular resolution to detect from space nuclear obscured SNe which might have been missed by ground-based surveys. ...

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• APOD: July 10, 1998 - Interacting Galaxies

... Stellar Evolution is driven entirely by the never ending battle between Pressure and Gravity . As imbalances are reached, the star is driven to find a new Energy source. ... Pressure and gravitational forces are equal, the star is stable and its core is sufficiently hot to fuse Hydrogen into Helium More about main sequence stars . ... The luminosity generated by the core fusion of Helium into Carbon is far greater than the shell luminosity associated with the fusion of Hydrogen into Helium. ...

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... Eileen Marie Collins (Colonel, USAF, RET.) ... SPECIAL HONORS: Defense Superior Service Medal, Distinguished Flying Cross, Defense Meritorious Service Medal, Air Force Meritorious Service Medal with one oak leaf cluster, Air Force Commendation Medal with one oak leaf cluster, Armed Forces Expeditionary Medal for service in Grenada (Operation Urgent Fury, October 1983), French Legion of Honor, NASA Outstanding Leadership Medal, NASA Space Flight Medals, Free Spirit Award, and the National Space...

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... AGES Precursor Observations · Targeted the M74 ( NGC 628) group · Noise falls as t (to 200s) AGES Precursor Observations · Targeted the M74 ( NGC 628) group · Noise falls as t (to 200s) AGES Precursor Observations · Targeted the M74 ( NGC 628) group · Noise falls as t (to 200s) · Detected 5 galaxies in the group KDG 010 dw0137+1540 UGC 1171 AGES Precursor ...

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• Different types of HVCs in different environments?

... A Galaxy Gravitational Lens . ... 19.12.1995 . ... Credit Copyright: NASA , HST , K. Ratnatunga. Myungshin Im ( JHU ) Explanation: Sometimes it takes a keen eye to see a good mirage. ... Consequently, the huge mass of the galaxy is able to pull separate images of the quasar around it - an effect called gravitational lensing . ... 1995 1996 . ... Publications with keywords: gravitational lens . ... MACS 1206: A Galaxy Cluster Gravitational Len . ... Abell 370: Galaxy Cluster Gravitational Lens . ...

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Application of IVOA software tools for radio sources investigation Zhelenkova O., Kopylov A., Chernenkov V. The interrelationship between the objects of astronomical catalogs in the different ranges of electromagnetic spectrum and their association into the real astrophysical source has obvious scientific interest. ... We used NVSS as the reference coordinate catalog. ... For 60% of radio sources identified with the objects of the radio catalogs we discovered optical candidates in SDSS survey. ...

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... What is the view of the sky at extreme energies ? ... 2015 : 2015 : Ultimate price tag 400-800 M A very large multi-purpose facility A very large multi-purpose facility Options: Options: Water Megatonne (,,MEMPHYS ) --Water Megatonne (,,MEMPHYS ) 100 kton Liquid Argon (,,GLACIER ) -- 100 kton Liquid Argon (,,GLACIER ) 50 kton scintillaton detector (,,LENA ) --50 kton scintillaton detector (,,LENA ) Soon : Borexino Soon : Borexino 2015 : 2015: EUSO ? ...

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• Different X-ray Spectra

... During the analysis of the surveys carried out on RATAN-600, it was found that almost one fifth of the detected sources shows significant radio flux variations. ... We used the data from "Cold" radio surveys carried out with RATAN-600 in 1980-1994 to search for radio sources with significant flux variability. ... On possibility of detection of variable sources using the data of Cold surveys carried out on RATAN-600. ... Detection of Variable Sources Using the Data of "Cold" Surveys. ...

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... 14.1 Foreground color: the 'color' property . ... 14.2.1 Background properties: 'background-color' , 'background-image' , 'background-repeat' , 'background-attachment' , 'background-position' , and 'background' . ... Background properties are not inherited, but the parent box's background will shine through by default because of the initial 'transparent' value on 'background-color' . ... BODY { background: white url("pendant.gif"); background-repeat: repeat-y; background-position: center; } . ...

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