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3261. http://www.mso.anu.edu.au/pfrancis/ObsTech/optical.pdf
... Note ґ when you get data from a CCD or IR detector, you get a number of counts in each pixel. ... Bad Pixel Removal. ... This is due to charge bleeding ґ this star is so bright that the number of electrons generated in the central pixels of the CCD was more than the potential well could hold ґ some of them leaked into adjoining pixels. ... Multiply by the number of square arcsec subtended by your source, to get the amount of sky light that will be falling onto the same pixels in your detector. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/optical.pdf -- 689.3 Кб -- 09.05.2007
[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/optical.pdf -- 689.3 Кб -- 09.05.2007
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[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/optical.pdf -- 689.3 Кб -- 09.05.2007
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3262. http://www.mso.anu.edu.au/~bessell/DOapp.txt
bessell@mso.anu.edu.au Designated Observatory Text Documents THE ASTRONOMICAL SOCIETY OF AUSTRALIA Designated Observatory Registry Application Form Last modified: 1 May 2007 The Astronomical Society of Australia has been asked by STANDARDS AUSTRALIA to compile a list of "designated" optical observatories that are valuable resources for (i) research, (ii) education and (iii) community use. The ASA is the final arbiter of whether any particular observatory is so designated. ...
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Ссылки http://www.mso.anu.edu.au/~bessell/DOapp.txt -- 6.1 Кб -- 08.05.2007
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3263. http://www.mso.anu.edu.au/pfrancis/ObsTech/TutEx2.pdf
... Question 1: It is widely believed that US spy satellites are so powerful that they can read a newspaper over your shoulder. ... Question 2: SkyMapper will obtain the magnitudes of about five billion objects, in each of 7 filters. ... But a few may be weird and exciting new classes of objects. ... Question 3: The average density of stars in our local part of the galaxy is 0.7 per cubic parsec. While doing a parallax survey, you found a 1 cubic parsec region which contains 4 stars. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/TutEx2.pdf -- 45.9 Кб -- 04.05.2007
[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/TutEx2.pdf -- 45.9 Кб -- 04.05.2007
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[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/TutEx2.pdf -- 45.9 Кб -- 04.05.2007
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3264. http://www.mso.anu.edu.au/pfrancis/ObsTech/Ass4.pdf
... A theory suggests that a certain sub-class of gamma-ray bursts all have the same absolute magnitude. ... The author claims that this absolute magnitude is so different from that in the previous sample that this must belong to a new sub-class of gamma-ray bursts. ... To do this, there needs to be some feature in their spectra which correlates with their absolute magnitude. ... Consider a telescope which is continually monitoring a star, looking for transits due to planets orbiting this star. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/Ass4.pdf -- 86.3 Кб -- 04.05.2007
[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/Ass4.pdf -- 86.3 Кб -- 04.05.2007
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[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/Ass4.pdf -- 86.3 Кб -- 04.05.2007
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3265. http://www.mso.anu.edu.au/pfrancis/ObsTech/Stats2.pdf
... If we make these assumptions, we can approximate the noise on any variable as a Gaussian, which is fully specified by its standard deviation s. Which is much simpler than needing the full probability density function for each variable. ... Electronic noise. ... sum ! ... So if you have a bunch of pixels containing no objects, the mean number of counts will be 1000, and the standard deviation will be the quadrature sum of 31.6 (the photon Poisson noise) and 5.3 (the read-out noise) ґ ie. 32.06 counts...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/Stats2.pdf -- 393.1 Кб -- 02.05.2007
[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/Stats2.pdf -- 393.1 Кб -- 02.05.2007
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[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/Stats2.pdf -- 393.1 Кб -- 02.05.2007
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3266. http://www.mso.anu.edu.au/~charley/papers/IncreasinglyOverlappingMagisteria9.pdf
... But what about the origin of the universe and its laws, the origin of ethics and the purpose of life? ... Dennett 2006, p 30) As science begins to address more fundamental and previously taboo issues (the origin of the universe, the origin of life, the origin and evolution of humanity, the evolutionary biology of human nature, sexuality, consciousness and morality), the magisteria of science expands and increasingly overlaps with the traditional monopoly that religion has had on these areas. ...
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Ссылки http://www.mso.anu.edu.au/~charley/papers/IncreasinglyOverlappingMagisteria9.pdf -- 67.0 Кб -- 01.05.2007
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3267. http://www.mso.anu.edu.au/~charley/papers/RoblesLineweaver2006.pdf
Is the Sun a Random Star? ... Looking for another Sun Conditions for habitability are not only determined by a planet's properties itself, they are given by the starґplanet system characteristics (stellar type, planetary orbital parameters, and planetary masses). ... In the search for terrestrial planets around other Page 176 Proceedings of the 6th Australian Space Science Conference, 2006 stars, the simplest assumption is that the most Earthґlike planets orbit Sunґlike stars. ...
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Ссылки http://www.mso.anu.edu.au/~charley/papers/RoblesLineweaver2006.pdf -- 68.9 Кб -- 01.05.2007
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3268. http://www.mso.anu.edu.au/~charley/papers/LineweaverRobles2006.pdf
... Abstract: The focus of extrasolar planet searches has become the detection of habitable terrestrial planets. ... Since the chemical compositions of terrestrial planets also play an important role in habitability, we propose the creation on the observed chemical abundances of stars. Keywords: Terrestrial planet formation, Solar system, chemical composition Introduction a century astronomers have relied on the Hertzsprung-Russell diagram to classify stars according to their colour and magnitude. ...
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Ссылки http://www.mso.anu.edu.au/~charley/papers/LineweaverRobles2006.pdf -- 82.1 Кб -- 01.05.2007
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3269. http://www.mso.anu.edu.au/pfrancis/ObsTech/radio_exercises.txt
I. Since the crew of astronomers in this Observational Techniques course already has some experience with "optical telescopes" and a working knowledge of optics and diffraction theory, it's useful to apply that experience to radio telescopes. ... The telescope is a favorite to Australian astronomers for observing the 21cm spectral line of atomic hydrogen. ... The idea is to use the Parkes All-Sky Survey in the 21cm line to estimate some parameters for your favourite galaxy. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/radio_exercises.txt -- 4.7 Кб -- 30.04.2007
[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~fbriggs/radio_exercises.txt -- 4.7 Кб -- 30.04.2007
[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/radio_exercises.txt -- 4.7 Кб -- 30.04.2007
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[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~fbriggs/radio_exercises.txt -- 4.7 Кб -- 30.04.2007
[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/radio_exercises.txt -- 4.7 Кб -- 30.04.2007
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3270. http://www.mso.anu.edu.au/~charley/papers/LineweaverEgan2007.pdf
The Cosmic Coincidence as a Temp oral Selection Effect Pro duced by the Age Distribution of Terrestrial Planets in the Universe Charles H. Lineweaver1 Chas A. Egan1,2 1 Planetary Science Institute, Research School of Astronomy and Astrophysics ... We have made the most specific anthropic explanation of the cosmic coincidence using the age distribution of terrestrial planets in our Universe and found this explanation fairly robust to the largely uncertain time it takes observers to evolve. ...
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Ссылки http://www.mso.anu.edu.au/~charley/papers/LineweaverEgan2007.pdf -- 484.1 Кб -- 30.04.2007
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3271. http://www.mso.anu.edu.au/~kcf/surya/spiralstructure/Seigar06
... I. METHOD OUTLINE Marc S. Seigar1 , James S. Bullock1 , Aaron J. Barth1 and Luis C. Ho2 Draft version April 17, 2007 arXiv:astro-ph/0603622v1 22 Mar 2006 ABSTRACT We investigate the use of spiral arm pitch angles as a probe of disk galaxy mass profiles. We confirm our previous result that spiral arm pitch angles (P) are well-correlated with the rate of shear (S) in disk galaxy rotation curves, by using a much larger sample (51 galaxies) than used previously (17 galaxies). ...
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Ссылки http://www.mso.anu.edu.au/~kcf/surya/spiralstructure/Seigar06 -- 409.4 Кб -- 22.04.2007
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3272. http://www.mso.anu.edu.au/pfrancis/ObsTech/Ass2.pdf
... But today, you haven't detected any. ... Its mission is to search for planets around other stars by looking for the dimming in their light when a planet passes in front of it. It will monitor 100,000 stars for five years, looking for the slight dimming caused by these planetary transits. ... You will observe in the Vquantum efficiency (i.e. it detects 80% of the photons that hs). ... Assume that the only photons you detect come from the star ґ i.e. ignore background light. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/Ass2.pdf -- 66.2 Кб -- 20.04.2007
[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/Ass2.pdf -- 66.2 Кб -- 20.04.2007
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[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/Ass2.pdf -- 66.2 Кб -- 20.04.2007
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3273. http://www.mso.anu.edu.au/pfrancis/ObsTech/Stats1.pdf
... It's also crucial for many projects to be able to justify why you need to observe a given number of targets. ... A "statistic" is technically just such a number, derived from some vast pile of data, which hopefully tells us something interesting. ... Measure this "statistic" from your data. ... Set this to be a random number drawn from a Poisson distribution with mean 1208x1.01=1220.08. ... Create another array, and fill it with Gaussian random numbers with mean 0 and standard deviation 20. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/Stats1.pdf -- 2415.0 Кб -- 18.04.2007
[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/Stats1.pdf -- 2415.0 Кб -- 18.04.2007
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[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/Stats1.pdf -- 2415.0 Кб -- 18.04.2007
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3274. http://www.mso.anu.edu.au/pfrancis/ObsTech/starflare.py
from numarray import * from numarray.random_ array import * size = 8640 # Number of observations flare = 1.1 # Size of flare counts = 1208*4*4 # Number of counts in the absence of a flare threshold = 0.97 # Threshold of mean flare flux at which you claim a flare . seed() # start up the random number generator photons = poisson ( counts ,[ size ]) # set up poisson noise ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/starflare.py -- 1.7 Кб -- 18.04.2007
[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/starflare.py -- 1.7 Кб -- 18.04.2007
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[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/starflare.py -- 1.7 Кб -- 18.04.2007
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3275. http://www.mso.anu.edu.au/pfrancis/ObsTech/MagPrac.pdf
Magnitude Practice Exercises 1: A quasar has an I-band magnitude of 21.0 (Vega). What is its flux at this wavelength: Ї In f Ї In f (answers: 4.48в10 -2 0 W m-2 nm-1, 1.16в10 -3 1 W m-2 Hz-1). 2: A star has V=21.0 and I=20.7 (Vega). What is it's (f) flux in V? and in I? What is the ratio between the two? (answers: 1.45в10 -1 9 W m-2 nm-1, 5.91в10 -2 0 W m-2 nm-1, 2.45). ... What is its flux at this wavelength: Ї In f Ї In f (answers: 4.37в10 -3 0 W m-2 Hz-1, 7.75в10 -1 9 W m-2 nm-1). ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/MagPrac.pdf -- 60.0 Кб -- 13.04.2007
[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/MagPrac.pdf -- 60.0 Кб -- 13.04.2007
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[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/MagPrac.pdf -- 60.0 Кб -- 13.04.2007
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3276. http://www.mso.anu.edu.au/pfrancis/ObsTech/TutEx1.pdf
... It is 1st August, and you are hoping to observe a number of bright galaxies from a catalogue. ... You used the normal Vega magnitude scale. You now want to compare your B-K colour against the published colours of another, supposedly similar star you found in the literature. Your colour: B-K = 3.43 Literature colour: B-K = 3.41 Unfortunately, when you read the small-print in the literature paper, you found that the published colour used AB-magnitudes, not Vega magnitudes. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/TutEx1.pdf -- 66.7 Кб -- 12.04.2007
[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/TutEx1.pdf -- 66.7 Кб -- 12.04.2007
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[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/TutEx1.pdf -- 66.7 Кб -- 12.04.2007
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3277. http://www.mso.anu.edu.au/pfrancis/ObsTech/IO_demo.py
... It adds together the first two of these numbers. If the result is greater than the # third number, it prints all three numbers out (to a file called results.d) # Otherwise it prints out a rude message # First , open the files inhandle = open ('data.d', 'r') outhandle = open ('results.d', 'w') # Now loop through all the lines in the input. for line in inhandle: allarray = line .split() # Split the line you've just read in into its component bits n1 = float ( ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/IO_demo.py -- 2.2 Кб -- 12.04.2007
[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/IO_demo.py -- 2.2 Кб -- 12.04.2007
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[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/IO_demo.py -- 2.2 Кб -- 12.04.2007
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3278. http://www.mso.anu.edu.au/pfrancis/ObsTech/generate.py
from numarray import * from numarray.random_array import * size = 50000 bmean = 17.0 bsig = 2.0 bkmean = 2.0 bksig = 1.0 rmin = 0.1 rmax = 2.0 outhandle = open('simdata.d', 'w') seed() number = arange( size ) rah = randint (0,24, size ) ram = randint (0,60, size ) ras = uniform ( 0.0 , 60.0 , size ) dd = 57.295*arccos( uniform (- 1.0 , 1.0 , size )) - 90.0 dd = dd.astype(Int8) dm = randint (0,60, ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/generate.py -- 1.8 Кб -- 12.04.2007
[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/generate.py -- 1.8 Кб -- 12.04.2007
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[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/generate.py -- 1.8 Кб -- 12.04.2007
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3279. http://www.mso.anu.edu.au/pfrancis/ObsTech/BrightnessUnits.pdf
... Virtually all detectors and telesco pes are sensitive to only a particular range of frequencies or wavelengths. ... Flux per unit wavelength or frequency So in practice, when we measure how much radiation we receive from some object, we usually mean the energy at some particular frequency, not the integral of the energy over all frequencies (which would be the bolometric brightness). ... But imaging data at UV, optical and IR wavelengths often uses a different approach: broad-band imaging. ...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/BrightnessUnits.pdf -- 468.8 Кб -- 11.04.2007
[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/BrightnessUnits.pdf -- 468.8 Кб -- 11.04.2007
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[ Текст ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/BrightnessUnits.pdf -- 468.8 Кб -- 11.04.2007
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3280. Which Programming Language Should I use
... Perl . ... IDL is used for data analysis and graphics. ... Advantages of a language that is popular in the real world are the existence of web resources such as tutorials, a wide range of libraries of existing code you can use and modify, and better job prospects for you if you ever want to venture into the real world. ... Most data reduction systems (eg IRAF, MIDAS, Starlink) do not interface well with any programming language: IRAF has itуs own (very clunky) language in which you can write scripts...
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Ссылки http://www.mso.anu.edu.au/pfrancis/ObsTech/WhichLanguage.htm -- 24.2 Кб -- 10.04.2007
[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/WhichLanguage.htm -- 24.2 Кб -- 10.04.2007
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[ Сохраненная копия ] Ссылки http://www.mso.anu.edu.au/~pfrancis/ObsTech/WhichLanguage.htm -- 24.2 Кб -- 10.04.2007
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