. " The Arecibo Observatory is sponsored by the National Science Foundation. Any opinions, findings and conclusions or recommendations . expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation."

... As is known, the observed distribution of massive stars in the direction of the Galactic center looks very peculiar: the vast majority of all massive stars are concentrated towards the central 1 pc or so (Genzel et al. ... In order to compare the observed distribution of X-ray sources in the Galactic center with what would be expected from the population synthesis computations, we have considered two hypothetical scenarios for the location of the starburst. ...

Next: NICMOS/HST H-band (F160W) Images Up: NICMOS Science Previous: HST NICMOS Observations of . ... Observations of P . ... The NICMOS team has devised a comprehensive program of observations of the Galactic Center. ... Data in hand give a first look at variability and a detailed look at the search for the tip of the main sequence will be discussed where NICMOS has demonstrated adequate sensitivity and photometric precision to identify likely O8-B1 stars at the Galactic Center. ...

ChaMP and the High Redshift Quasars in X­rays S. Mathur 1 Harvard Smithsonian Center for Astrophysics Cambridge, MA 02138 H. Marshall 1 MIT, Cambridge, MA 02139 N. Evans 1 , P. Green 1 and B. Wilkes 1 Harvard Smithsonian Center for Astrophysics Cambridge, MA 02138 Abstract. ... This will enable us to determine the high redshift X­ray luminosity function. ... Prediction of Redshift Distribution of Quasars in ChaMP Fields The X­ray Luminosity Function at z = 0 is described as \Phi(L X ) = \Phi ? ...

Next: Accretion Disks with Up: StarsStellar Populations, Previous: Spectroscopic Analysis of . ... We present and discuss spatially resolved spectra of the accretion disk and the gas stream region as a function of distance from disk center, the spectrum of the uneclipsed light, and the radial temperature distribution in the ultraviolet. Keywords: Accretion disks, Cataclysmic variables . ... In this paper we report on the HST spectral mapping of the nova-like UX UMa. ...

Next: The derived luminosity and Up: The galactic population of Previous: The galactic population of . Figure 16: The observed distribution of pulsar dispersion measures. Dotted curve is the total known population, solid curve is the Parkes survey. Figure 17: The observed distribution of pulsar distances above the galactic plane. ... Figure 18: The observed distribution of pulsar flux densities. ...

... This thread contains a step-by-step recipe to extract MOS spectra of a point-like source observed in Imaging mode and to create associated response matrices, starting from a calibrated, concatenated event list (either produced with emproc or available as PPS product; here it has the assumed file name MOS.fits ). ... The users should note that the SAS metatask xmmselect allows them to interactively define source and background regions (via ds9) and to run backscale on the fly. ...

Some peculiarities of orbits of observed comets. ... Icarus, 2005 Simulation and reality Distribution of anti-perihelia of short-period comets with e 0.9 ( ecliptic coordinates ) Distribution of anti-perihelia of short-period comets with e 0.9 ( ecliptic coordinates ) Distribution of anti-perihelia of long-period comets with 0.9 e 1 ( ecliptic coordinates ) ­ ...

... According to the most popular cosmological paradigm, the greater part of the galaxy mass is accumulated in the dark matter halo. ... The polar ring galaxies (PRGs) reveal external rings or disks of gas, dust and stars rotating in a plane roughly perpendicular to the disk of the central galaxy. ... The shape of the dark halo in the model was chosen so as to achieve the best fit to the observed rotation of both galaxies themselves and their polar rings. ... The SPRC-7 galaxy. ...

... Observing . ... Home Observing Lincoln Center Lincoln Center Observing Schedule . ... Clear Sky Chart . ... Lincoln Center . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . Observing Resources for Amateur Astronomers - Part 2: Intermediate Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... Cross-shaped galaxy ZGC 2315+03 (Fig.1) has been described by Zwicky (1971) as ``post-eruptive or the result of the crossing of a compact galaxy through an edge-on spiral'' . This object was included in the Polar-Ring Catalog (C-71) by Whitmore et al. (1990) as a possible candidate for Polar-Ring Galaxies (PRG). ... One of them is galaxy 'disk' and the other is 'polar-ring'. ... The facts against the polar-ring nature of ZGC 2315+03 can be summarized as follows: . ...

January 7, 2000 Dr. Eric Torrence, University of Chicago . ... 3:00pm, 240D Willamette Hall . Dr. Torrence will also present the Physics Colloquium on January 6. return to top . ... Dr. Morii will also present the Physics Colloquium on January 24. return to top . ... return to top . ... The ratio of the inclusive jet cross sections at center of mass energies 0.63 TeV and 1.8 TeV is also presented versus scaled jet transverse energy x_T and compared to QCD predictions. 3:00pm, 472 Willamette Hall . ...

. An outline of how the dark matter distribution (right) was reconstructed from optical images (left) taken by the Subaru Telescope. A precise measurement of the shapes of background galaxies in observed images enabled the team to investigate the distortion pattern (center) and then reconstruct the distribution of dark matter in the galaxy clusters. // NAOJ/ASIAA/School of Physics and Astronomy, University of Birmingham/Kavli IPMU/Astronomical Institute, Tohoku University

... 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. ...

Variations of total ozone content and lower ozone stratosphere temperature in Antarctic Region during winter-spring period A.V. Grytsai National Taras Shevchenko University of Kyiv Astronomy and Space Physics Department assen@univ.kiev.ua Data, used in the work work Total ozone: Total Ozone Mapping Spectrometer (TOMS) measurements during 1979 - 2005 and Ozone Monitoring Instrument (OMI) ones for 2006, for http://toms.gsfc.nasa.gov/ftpdata.html. ... A long-term TOC decrease is significant. ...

... НЕПРЕРЫВНОГО МАТЕМАТИЧЕСКОГО ОБРАЗОВАНИЯ . ... Кружок ?Олимпиады и математика? ... Московская математическая олимпиада . Заочный математический конкурс . ... Устные математические олимпиады . Олимпиады по программированию . Математический праздник . Математические регаты . ... Математические бои . Олимпиада по геометрии им. И.Ф.Шарыгина . ... Программа ?Math in Moscow? Научные конкурсы . Творческий конкурс . ... График олимпиад . ... XXVII Математический праздник . ...

... AMPLE (Adaptable Minor Planet Ephemerides) is integrated software package to deal with a number of problems concerning minor planets with the aid of IBM-type personal computer. ... compiling a list of all numbered minor planets which can be seen at certain moment within specified sky region and visualization of their mutual positions; . ... As AMPLE is able to reproduce virtually any table of "the Ephemerides of Minor Planets" , it may be considered as computer version of the EMP. ...

... Our resulting sample of ELGs presented in Tables 2 and 3 is not artificially biased to any specific type of galaxies. ... Since we are looking for selection of a sample of Case BCGs, it is interesting to examine how the detected BCGs are connected with Case emission-line codes. ... Altogether BCGs comprise about 60 % of all Case ELGs which display emission lines in our spectra, or about 44 % of all Case galaxies with some emission-line code. ... Among those with the code ``w'' about 40 % are BCGs. ...