... Posts tagged ?PDF? ... Probability density functions are another way of summarizing the consequences of assuming a Gaussian error distribution when the true distribution is Poisson. ... The figure below ( AAS 472.09 ) compares the pdfs for the Poisson intensity (red curves) and the Gaussian equivalent (black curves) for two cases: when the number of counts in the source region is 50 (top) and 8 (bottom) respectively. ... Tags: background , gaussian , PDF , Poisson . ... ArXiv] 4th week, Nov. 2007? ...

We present a mid-infrared analysis of star-formation activity in the Large Magellanic Cloud's molecular ridge (south of 30 Doradus). The Magellanic Clouds are a rare laboratory in which extragalactic star-formation diagnostics can be tested at high spatial resolution. ... Detailed analysis in very nearby galaxies, like the Magellanic Clouds, allows us to test and better understand the scaling relations used in unresolved and distant star-formation regions. ...

... Massive Star Forming Region DR21 in Infrared . ... JPL , Caltech , NASA Explanation: Deep in the normally hidden recesses of giant molecular cloud DR21, a stellar nursery has been found creating some of the most massive stars yet recorded. The orbiting Spitzer Space Telescope 's Infrared Array Camera opened the window into the cloud last year in mid- infrared light. ... Publications with keywords: star formation - stellar nursery . Publications with words: star formation - stellar nursery . ...

XMM-Newton Science Analysis System Page: 1 backcorr November 22, 2004 Abstract backcorr makes a background spectrum appropriate to the accumulation region used for a given source spectrum. The task calls arfgen twice; once for the source region and once for the background region. ... EPIC backcorr corrected background spectrum [1] 8 Algorithm subroutine backcorr Arfgen computes the effective area curves for both the source (arf_in_src.arf) and background (arf_in_bkg.arf) regions. ...

... 2004 April 14 . Massive Star Forming Region DR21 in Infrared . ... Explanation: Deep in the normally hidden recesses of giant molecular cloud DR21, a stellar nursery has been found creating some of the most massive stars yet recorded. The orbiting Spitzer Space Telescope 's Infrared Array Camera opened the window into the cloud last year in mid- infrared light. The cloud is opaque to visible light because of dense interstellar dust . ... About APOD | ...

Next: Arbitrary Regions of Interest Up: Region of Interest and Previous: Region of Interest and . Generally a minimum of three routines are needed to process even ``regular'' regions of interest. ... The routines of interest are: subroutine BoxInput(key,dataset,boxes,maxboxes) subroutine BoxSet(boxes,naxis,nsize,flags) subroutine BoxInfo(boxes,naxis,blc,trc) All routines require an integer array, boxes , which is used to accumulate a description of the region of interest. ...

... astro-ph . ... Whitespace-separated words are treated as AND ed. Show 10 50 100 articles per page in Full Compact mode . ... Quasar Variability in the Framework of Poissonian Models . ... It is shown that in this very general framework the well established anti-correlation between variability amplitude and wavelength can only be understood as an effect of an underlying spectral component which remains stable on long time-scales, and is redder than the variable component. ...

... We report on our ongoing project ``Infrared Study of HII Regions Associated with Small Clouds.' ... These IR data, combined with optical imaging (which will be obtained from the IAC-80 telescope), IRAS survey maps, and existing CO observations of the associated clouds, will allow us to undertake a detailed investigation of the gas-to-dust mass ratio, initial mass function and the star-formation efficiency in these complexes. ... CHECKPSF: check the PSF (Point Spread Function) model, . ...

... 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. ...

... OCR by H.Andernach 1/96, to be proof-read) This is the first of a series of papers presenting results of a 10-GHz radio continuum survey of the galactic plane region using the 45-m telescope at Nobeyama. ... Weak Nonthermal Sources: A comparison with the Bonn S-GHz survey reveals a number of weak nonthermal sources near the galactic plane. ... For this reason we conducted a survey of the galactic plane region at 10 GHz using the 45-m radio telescope at the Nobeyama Radio Observatory (NRO). ...

T his page contains synthetic Hertzsprung-Russell Diagrams (HRDs) for a simulated Star Forming Region, assuming different scenarios and timescales for the history of star formation. ... In the paper we only presented the best fits to the HRD of the CMa R1 Star Forming Region. ... Download movie (1.90 MB) . Scenario II: Constant rate of star formation during a time interval delta t . delta t = 0.1 Myr . ... Scenario IV: Linearly decreasing rate of star formation during a time interval delta t . ...

... Ultraviolet photons have short wavelength and high energy and thus come from sources which have fairly high temperatures. ... Star formation regions in nearby galaxies . Star formation regions in our own galaxy . ... In addition, the background glow of the night sky is at a minimum level at around 2000 angstroms. ... It is hoped that these very diffuse galaxies can be more easily imaged at a wavelength where the noise from a background of finite brightness is at its minimum. ...

82% of the galaxy s total [O III] luminosity, confirming that J2240 is a quasar ionization echo. The ionized gas cloud has a strong kinematic link to the central AGN and is co-rotating with the main body of the galaxy, suggesting that it may be the remnant of a quasar-driven outflow. ... Detailed 3D spectroscopic analysis of other GB galaxies will provide further insight into the evolutionary history of this unique class of objects. ...

... We have assumed a constant in time star formation rate and the total number of stars in the Galaxy, , to be such that the total mass of the galaxy is ; assuming the Salpeter mass function   , we get . ... This number agrees with a standard estimation of the galactic star formation rate of order of per year. In each run of calculations, we trace the evolution of binaries with initial parameters randomly distributed according to the chosen initial laws. ...

OFFICIAL PRESS RELEASE . ... the International Space Station . ... P. Semenov, Technical Manager of the Russian Manned Space Programs, General Designer of S.P. Korolev RSC Energia, Academician of the Russian Academy of Sciences, Frederick D. Gregory, NASA Deputy Administrator, N.A. Anfimov, General Director of TsNII of Machine-Building, Academician of RAS, as well as representatives of Roskosmos, NASA, Russian enterprises and organizations participating in the implementation of the ISS program. ...

Nowadays at the Department the experimental and theoretical investigations, including astronomical and ionospheric observations, active experiments with space vehicles are taking place. ... Solar Corona physics and erruptive phenomenae. ... Stellar astronomy. ... The Department has organized and put into practice more then 50 expeditions for observation of Solar ecllipces, aurorae polaris, comets, meteor streams, controlled space experiments, and also for investigations of geophysical characteristics. ...

... Samara region . SSAU History . ... An alignment meeting on data mining, storage and processing of very large data amounts on the basis of hardware and software complex Big Data took place in Samara State Aerospace University. ... The laboratory for processing of very large data amounts on the basis of the hardware and software complex was made in the University and the necessary equipment was purchased. ... Data processing requires powerful processors and advanced computer programs. ... Big Data. ...

Spectrometric complex of RATAN-600. ... There is a system of stable computer driven local oscillators that have accuracy about 10 to degree -8. ... Spectrometer driving system is accomplished with two DVK-4 computers and one IBM PC and make possible to develop radio line observations on the frequency band pass of the input low noise amplifiers ( LNA ): . ... The performance of spectrometric complex is controlled by program driving system ( PDS ) and the data gathering and recording system ( DGS ). ...

... We present a photometric and spectroscopic study of the unique isolated nearby galaxy KKR25. The isolated dwarf spheroidal (dSph) galaxy KKR25 was discovered by Karachentseva, Karachentsev Richter (1999, A , 135, 221) during the search of dwarf galaxies in the direction of the Local Void. In spite of its isolation KKR 25 has no gas and looks like a normal dwarf spheroidal system. ... This is the first known planetary nebula in a dwarf spheroidal galaxy outside the Local Group. ...

... Institute of Solid-State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia . Received June 15, 2000) . Temperature dependences of the resistivity tensor components ab and c were measured for YBa 2 Cu 3 O 7 - x single crystals with different oxygen contents. The resistivity anisotropy c / ab was found to grow exponentially with decreasing temperature. ... PACS: 74.25.Fy, 74.72.Bk ...