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1. Background correction
... One important issue for the spectral analysis with X-ray detectors is the treatment of background for extended sources. ... To deal with the particle background (more or less constant outside proton flares), one should assign weights to the reference event list and extract images or spectra using the same spectral or spatial (in detector coordinates) selection as the source. The original spatial selection (on the source) is usually applied to sky coordinates (not detector coordinates). ...
[ Сохраненная копия ]  Ссылки http://xmm.vilspa.esa.es/sas/8.0.0/doc/evigweight/node11.html -- 5.9 Кб -- 02.07.2008
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2. Silicon Nanoparticles: Source of Extended Red Emission?
We have reviewed the characteristics of the extended red emission (ERE) as observed in many dusty astronomical environments, in particular, the diffuse interstellar medium of the Galaxy. ... We have compared the photoluminescence properties of a variety of carbon- and silicon-based materials proposed as sources for the ERE with the observationally established constraints. We found that silicon nanoparticles provide the best match to the spectrum and to the efficiency requirement of the ERE. ...
[ Сохраненная копия ]  Ссылки http://www.stsci.edu/~kgordon/papers/1998ApJ...501L.111W.html -- 4.5 Кб -- 21.01.2016
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3. The AstroStat Slog ICA
... I happened to observe a surge of principle component analysis (PCA) and independent component analysis (ICA) applications in astronomy. ... Category: Algorithms , arXiv , Astro , Cross-Cultural , Data Processing , Jargon | ... Algorithms arXiv Astro Bad AstroStat Bayesian CHASC Cross-Cultural Data Processing Fitting Frequentist Galaxies gamma-ray High-Energy Imaging Jargon Job Languages MC MCMC Meta Methods Misc News Nuggets Objects Optical Physics Quotes Spectral Stars Stat Timing Uncertainty X-ray...
[ Сохраненная копия ]  Ссылки http://hea-www.harvard.edu/AstroStat/slog/groundtruth.info/AstroStat/slog/tag/ica/index.html -- 29.3 Кб -- 01.03.2014
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4. Calculating the Position and Velocity Components of HST
... The HST uses an onboard model of its orbit to perform in real-time various control functions relating to spacecraft operations and observation support. ... New coefficients for the ephemeris are updated every other day, and are archived as FITS keywords for each HST observation data set. Using these coefficients,an observer can perform a variety of calibration and characterization calculations relating to the orbital position and velocity of the telescope. ...
[ Сохраненная копия ]  Ссылки http://www.adass.org/adass/proceedings/adass94/aket.html -- 12.3 Кб -- 03.11.2000
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5. Introduction
Next: Principal Components Analysis Up: Multivariate Analysis Methods Previous: Multivariate Analysis Methods . Compared to the past, ever larger amounts of data are being collected in astronomy, and the rate will continue to accelerate in the next decades. It is therefore necessary to work on bigger samples if full advantage is to be taken of all accessible information. ... One way to work effectively on large samples is to apply, and if necessary to develop, suitable statistical methods. ...
[ Сохраненная копия ]  Ссылки http://www.sao.ru/precise/Midas_doc/doc/94NOV/vol2/node223.html -- 5.2 Кб -- 23.02.1996
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6. casacore: components/SpectralComponents/SpectralList.h Source File
... Classes . Files . ... File List . ... components . ... 00150 Bool set ( const SpectralElement in, const uInt which); 00151 00152 // Clear the list 00153 void clear (); 00154 00155 // Set a maximum size of the list 00156 void set ( const uInt nmax); 00157 00158 // Sort the list on the first parameter (i.e. peak value for Gaussian) 00159 void sort (); 00160 00161 // Convert to and from a Record (see details in SpectralElement) 00162 // group 00163 Bool fromRecord ( String errMsg, ...
[ Сохраненная копия ]  Ссылки http://www.atnf.csiro.au/computing/software/casacore/casacore-1.2.0/doc/html/SpectralList_8h_source.html -- 30.6 Кб -- 14.02.2011
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7. Some useful data about gains, NFs & compression points of Eddies box components
Subject: Some useful data about gains, NFs compression points of Eddies box components . ... Gain: ~ 21 dB . ... 1 dB compression: + 6 dBm . ... 1dB compression point for this system is ~ +15 dBm. For a clean(i.e., very linear) signal, we recommend staying 10 dB or more below the 1dB compression point, putting the "peak linear power" at +5 dBm. ... Assuming an LNA + Mixer gain of ~ 35 dB and with + 8 dBm mixer compression point, any input - 27dBm will begin to saturate the mixer. ...
[ Сохраненная копия ]  Ссылки http://www.naic.edu/~phil/mbeam/iflo/eddiesbox.html -- 3.6 Кб -- 05.04.2008
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8. Solar system sector, archive 1994
... 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 . ...
[ Сохраненная копия ]  Ссылки http://www.sao.ru/Doc-en/Science/results/ar_solar/res1994.html -- 6.4 Кб -- 10.04.2016
[ Сохраненная копия ]  Ссылки http://mavr.sao.ru/Doc-en/Science/results/ar_solar/res1994.html -- 6.4 Кб -- 10.04.2016
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9. What are typical star-to-star distances in globular clusters compared to
... Gravitational wave search provides insights into galaxy evolution and mergers . ... galaxies . ... Globular cluster NGC 2808, elliptical galaxy NGC 2986, and the Sextans Dwarf . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... What are typical star-to-star distances in globular clusters compared to stellar distances in our region of the galaxy? ... RELATED TOPICS: GLOBULAR CLUSTERS . ... Get instant access to subscriber content on Astronomy.com! ...
[ Сохраненная копия ]  Ссылки http://www.astronomy.com/magazine/ask-astro/2012/03/a-starry-backyard -- 63.1 Кб -- 10.04.2016
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10. Journal "Peremennye Zvezdy"
Peremennye Zvezdy", . ... Star Name: . GSC 3710-00312, USNO-A2.0 1425-04252279 . ... Variability type: . ... USNO-A2.0 1425-04252279 is located at the distance of 15?.7 from the X-ray source 1RXS J031707.9+572942, which is larger than the position error of the source (12?), but its hardness ratio HR1 = 0.03 0.29, typical of chromospherically active stars, and its character of variability allow us to assume that the star is related to the X-ray source. ... Eclipsing variability . Sine wave 1 . ...
[ Сохраненная копия ]  Ссылки http://www.astronet.ru/db/varstars/msg/1250291 -- 11.7 Кб -- 03.02.2013
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11. OEM Optical Components
... OEM OPTICAL COMPONENTS . ... Home Products OEM Optical Components . ... Objective, Plan Achromatic, 4 X 0.12, BF . ... Objective, Flatfield Achromatic, 20 X 0.40, BF . ... Objective, Flatfield Achromatic, 30 X 0.90, Iris, H2O Imm., ... Objective, Flatfield Achromatic, 60 X 1.00-0.70, Oil, Iris, BF . ... Objective, Flatfield Achromatic, 100 X 1.25, Oil, BF . ... Q-Plan™ Achromat Objective, 2.5 X 0.08, BF . ... Q-Plan™ Achromat Objective, 60 X 0.85, dry, BF . ... Eyepiece, Widefield, 10X, F.N. 18 . ...
[ Сохраненная копия ]  Ссылки http://www.lomoplc.com/OEMFrames.html -- 16.8 Кб --