... December 21, 1997 . ... Advantages are briefly discussed of gaining in spectral resolution, which is accompanied by losses in signal level, as compared with the attempts to improve the accuracy of measurement of line parameters by means of rising the S/N ratio alone with increasing the exposure time. To partially solve the problem of observations of faint objects at the BTA a new design echelle spectrometer is proposed. high resolution spectroscopy . ...

Next: Results & Discussion Up: Coronal Hole Diagnostics out Previous: Introduction . ... The dates of the observations discussed here, their locations, pointing, slit sizes and exposure times are given in BTDW. ... Line fits are given by the dotted line. ... An estimation of the errors in the derived parameters was obtained using the GA-derived parameters as an input for a ``classical'' IDL-CURVEFIT procedure (Peter, 1999; Peter & Judge, 1999). ...

... Impact on source motion in Galactic coordinate system is given by Kovalevsky (2003), Malkin (2011) l cos b = -A sin l, b = -A cos l sin b, where A = R0 02 /c is the galactocentric acceleration called hereafter the GA constant. ... We just have to return to the traditional many-centuries-old astrometric practice of modelling the position of a celestial object as a linear trend with two parameters: the position at the initial (conventional) epoch and the apparent (proper) motion. ... 2011). ...

... Programme . ... Abstract: Centaurus A is the first system in which direct evidence for a strong shock associated with radio-lobe expansion has been found, and is the nearest and most dramatic example of a jet / environment interaction. ... I will discuss the implications of these results for particle acceleration at the shock, for Centaurus A as a source of TeV radiation and UHECRs, and for shock heating in nearby and more distant galaxies. go back . ...

... Rumors of a Strange Universe . ... NASA Explanation: Only a few short years ago , when the APOD editors were in graduate school, the pervasive, cosmic Dark Energy was not even seriously discussed. Of course, it now appears that this strange energy dominates the cosmos (as well as lectures on cosmology ) and provides a repulsive force accelerating the large scale expansion of the Universe . ... NASA Official: Jay Norris. ... Publications with keywords: supernova - cosmology - dark energy . ...

On February 11-13 1998 at Kiljavanranta near Helsinki an Interball project meeting was organized by the Finnish Meteorological Institute and Russian Space Research Institute (IKI) . ... Main attention was devoted to mechanisms and manifestations of magnetospheric substorms, as observed from space and from ground observations. Four time intervals were selected for a coordinated data analysis. ... Magnetospheric storm on October 22, 1996 ( The LLBL-Driven Substorm? ... Programme of the Workshop. ...

Supernova cosmology : legacy and future Bruno Leibundgut ESO Congratulations! for the discovery of the accelerating expansion of the Universe through observations of distant supernovae Supernova Cosmology · Required observations ­ light curve ­ spectroscopic classification ­ redshift · Required theory ­ cosmological model ­ ( supernova explosions and light emission) · ... 2009 Union2 data set (557 SNe Ia) Goobar & Leibundgut 2011 Supernova Cosmology ­ do we need more? ...

... Julian Date Flux Densities (mJy) Julian Date Flux Densities (mJy) 2440000:0 A1 A2 B C 2440000:0 A1 A2 B C 8930.9968 153.8 134.6 59.8 22.6 9021.6846 154.0 137.0 59.0 22.9 8939.7717 163.7 146.0 66.1 22.9 9024.6766 151.4 134.6 58.4 22.1 8940.8936 153.2 135.8 59.2 22.6 9030.5334 156.7 139.1 59.0 22.4 8944.7380 161.7 142.2 63.7 23.1 9032.6650 151.8 136.5 57.7 22.6 8951.8637 148.4 131.3 58.3 21.7 9036.7067 155.1 137.1 58.8 ...

An Ancient Universe: How Astronomers Know the Vast Scale of Cosmic Time . ... Astronomers can also determine the speed a galaxy is moving by breaking up its light into its component colors, rainbow-fashion. ... This pattern is now called "the expanding universe", since the entire universe of galaxies seems to be moving away. ... The Ancient Universe - The Age of the Expanding Universe - The Age of the Oldest Stars - The Age of Light From Distant Galaxies - The Age of the Chemical Elements | ...

... Up: Data Analysis and Processing Techniques . ... Also, a method for quality control of CCD observations is suggested. ... Everyone who observes a celestial object using a CCD detects moving celestial objects as a ``by product''. ... We hope that our investigations may be useful for near-Earth space control and also for searches of the moving celestial objects through analysis of old and new CCD frames obtained at any amateur or professional astronomical observatory. ...

... Posts tagged ?Inselberg? ... Speaking of XAtlas from my previous post I tried another visualization tool called Parallel Coordinates on these Capella observations and two stars with multiple observations (AL Lac and IM Peg). As discussed in [MADS] Chernoff face, full description of the catalog is found from XAtlas website. ... MADS] Parallel Coordinates? ... vlk on [MADS] Parallel Coordinates . upvc windows on [MADS] Parallel Coordinates . ... Alfred Inselberg on [MADS] Parallel Coordinates . ...

... Aurora from Space . ... Magnetic Storms . ... The "ring of fire" seen by satellite cameras around the polar caps (picture below) is probably created by electrons leaking from the tail's plasma sheet, whose magnetic field lines form a somewhat imperfect trap. ... One possible explanation involves the close association between auroral arcs and electric currents which flow along field lines between the ionosphere and distant space ( Birkeland currents ). ... Why no aurora at the magnetic poles? ...

... Flux density at 1 GHz (/Jy): 2720 . ... 1991, ApJ, 373, 146. ... ADS . ... VLA at 1.4 GHz and 4.8 GHz (both 1".3), for polarisation studies. ... VLA at 1.4 GHz and 4.8 GHz, for proper motion studies. ... 151 MHz observations for bulk expansion studies. ... Chandra observations, showing outer shock. ... Fesen et al. ... Spitzer observations. ... Chandra observations of rim. ... 2006, ApJ, 636, 848. ... 2006, ApJ, 647, L41. -ray line observations. ... Spitzer and Chandra observations for 3-D structure...

... L. Testi(1,2) and A.I. Sargent(1) . 1) Division of Physics, Mathematics and Astronomy, Caltech, MS 105-24, Pasadena, CA 91125, USA . ... We review some of the basic guidelines used to plan, execute and analyse multi-field observations at the Owens Valley Radio Observatory millimeter wave array. As a working example we discuss our observations of the inner 5.5'x5.5' of the Serpens cloud core. ... Mantained by: Leonardo Testi . ...

... arXiv.org . ... Although great progress has been made in modelling the disk with radiative transfer models able to reproduce the spectral energy distribution (SED) of Herbig Ae stars, the constraints brought by images have not been yet fully exploited. Here, we are interested in checking if these new observational imaging constraints can be accounted for by predictions based on existing models of passive centrally irradiated hydrostatic disks made to fit the SEDs of the Herbig Ae stars. ...

... 8, ``Celestial Mechanics'', 2002 Dynamics of the Saturnian system with regard to high precision observations A. Vienne 1;2 , W. Thuillot 1 , J. E. Arlot 1 1 IMCCE/Observatoire de Paris 2 Universit'e de Lille, France The acquisition of high precision astrometric observations of Solar System ob­ jects can be applied to the improvement of the dynamical models and to explore some specific problems of celestial mechanics. ... Vienne A., Duriez L. TASS1.6: Ephemerides of the major Saturnian satel­ lites. ...

... A radio galaxy is a galaxy that emits an unusually big amount of energy at radio wavelengths. ... Inside of each galaxy with an active nucleus (radio galaxies are among them) there must be a system of a "central machine" responsible for the colossal amount of the emitted energy from radio to gamma ranges. ... Sometimes a radio source in an active galaxy may flare again if the needed conditions appear (a new portion of matter would fall into the furnace of the "central machine"). ...

... Tonight's Sky . ... Astronomy for Kids . ... Cosmic mirages" confirm accelerated cosmic expansion . ... The accelerated expansion increases the distance to the quasar, giving rise to higher chance of having a massive galaxy close to the light path to produce gravitational lensing. ... This research conducted an enormous survey of gravitationally lensed quasars and adopted much more sophisticated theoretical calculations to build a very convincing case for the accelerated cosmic expansion.т?? . ...

... click image to view discuss) . ... Submitted by Paul Valleli on 06/21/2007 00:15:41 . ... ITEAMS 1st Light (for Paul) . At the end of October '09, I got access to the robotic telescopes of the ITEAMS project - a 5-inch automatic scope with cooled CCD detector. ... Submitted by Paul Valleli on 11/03/2009 10:52:59 . ... Paul at the Air Space Museum of the Strategic Air Command, Ashland NE . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

MINUTES of the RadioAstron Teleconference on February 21, 2006 V. Slysh chaired the teleconference. ... Engineering model of the MFS (18-26 GHz) on-board receiver has been fabricated, and it is now under the testing in the ASC. The flight model is expected in April 2006. ... Operational time of 18-cm receiver was prolonged till the end of 2007 (as a launch date).The flight model of the 92-cm receiver will be delivered to the ASC in May 2007. ...