... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

... Light from Cygnus A . ... Credit Copyright: X-ray: NASA/CXC/SAO ; Optical: NASA/STScI ; Radio: NSF/NRAO/AUI/VLA Explanation: Celebrating astronomy in this International Year of Light , the detailed image reveals spectacular active galaxy Cygnus A in light across the electromagnetic spectrum. ... One of the brightest celestial sources visible to radio telescopes, at 600 million light-years distant Cygnus A is the closest powerful radio galaxy. ... Publications with keywords: Cygnus - active galaxy . ...

... Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2015 January 24 . Light from Cygnus A . Image Credit: X-ray: NASA/CXC/SAO ; Optical: NASA/STScI ; Radio: NSF/NRAO/AUI/VLA . Explanation: Celebrating astronomy in this International Year of Light , the detailed image reveals spectacular active galaxy Cygnus A in light across the electromagnetic spectrum. ... About APOD | ...

... Flux density at 1 GHz (/Jy): 56 . ... Notes: This is the remnant of the Tycho's SN of AD 1572. Radio: Shell, brightest to the NE. ... 1982, MNRAS, 200, 473. ... 1982, ApJ, 257, 145. ... Radio at 2.7 GHz (4'') from 1980 and 1983, and One-Mile Telescope at 1.4 GHz (23'') from 1965 and 1980, for expansion. ... VLA H I absorption observations towards central radio source. ... WSRT and Effelsberg 100-m at 1.4 GHz (50''), and VLA at 1.4 GHz (13''), for neutral hydrogen studies. ... 2010, ApJ, 715, L146. ...

... Australia Telescope Steering Committee . ... Parkes radio telescope . ... Such a model can reproduce much of the observed late-time evolution of the radio flux density and spectral index (though recent results for SNб 1993J (van Dyk et al. 1994) show that the Chevalier model does not adequately describe the early behaviour of radio light curves for this supernova, perhaps due to variations in the mass-loss rate and clumping in the stellar wind, which are not yet accounted for in the model). ...

... Bionic eyes. If our eyes could see in different wavelength bands, this is what the Sun would look like. ... Visible light, crucial to photosynthesis, is a type of radiation. ... At the heart of this revolution is the recognition that light travels as a wave. ... Dreams of Fields . ... By the time the fields go from strong to weak and back to strong, the wave has moved a certain distance, known as the wavelength. ... Red light, blue light, infrared light, ultraviolet light, radio waves, x-rays ? ...

... The light curves in 1996 . The light curves in 1997 . The Fourier spectra in 1997 . ... Max fluxes in flare of 1999 . ... The light curves in 1999 . ... The light curves in 2001 (decay of a flare) . The light curves in September 2001 - January 2002 . The light curves in November 2001 - January 2002 . The light curves in december 2001 - January 2002 . ... The light curves from September 2005 to February 2006 . The light curves from 12 January to 03 February 2006 . ...

... This thread contains a step-by-step recipe to extract EPIC (pn will be used as an example) light-curves of a point-like source, starting from a calibrated, concatenated event list (either produced with epproc or available as PPS product; it will bear the name: PN.fits in this thread). The content of this thread is the same as Extraction of a X-ray light curve for a point-like source (command-line version). ... in the lccorr GUI window (see Fig.7) define at least the following widgets: . ...

... Authors: Christopher P. O'Dea I review the radio to X-ray properties of GHz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) sources, the current hypotheses for their origin, and their use to constrain the evolution of powerful radio galaxies. ... The GPS and CSS sources are important probes of their host galaxies and will provide critical clues to the origin and evolution of powerful radio sources. ... huizinga@stsci.edu . ...

... Posts tagged ?light curve? ... Posted by hlee . ... Tags: book , Brieman , cigar , Clinton , data mining , Friedman , Hastie , KDD , light curve , machine learning , SCMA , shaking hands , SN , statistical learning , Supernova , Tibshirani . Category: Algorithms , Cross-Cultural , High-Energy , Jargon , Methods , Quotes , Stat , Uncertainty | Comment . ... Click for what was appeared in arXiv this week. ... Category: arXiv , Data Processing , gamma-ray , Objects , Spectral , Timing , X-ray | ...

... Bad Astronomy . Misconceptions . ... Bad Astronomy : "We're light years more advanced than our competition!" ... Even the closest astronomical object, the Moon, is 400,000 kilometers away! ... A beam of light will travel 9,500,000,000,000 kilometers in one year. This distance is defined as a light year ; the distance light travels in a year. ... This is another example of Bad Astronomy; like a light year, a parsec is a unit of distance, not time (to be specific, it equals 3.26 light years) . ...

Optical characteristics of non-spherical scatterers (definitions) . Most popular scatterer models and their parameters (a table) . ... Minsk collection of references to over 8000 light scattering papers (available partly) . ... Light scattering codes (incl. our codes with results of test runs) . Benchmarks in optical properties (in tabular form) . Dependence of optical properties on scatterer parameters (a graphics library) . ... Miscellaneous (incl. other similar databases) . ...

AGN7, Montagnana, 24 May 2006 Scattered and Stellar Light in Very Distant Radio Galaxies and Updates on a Test of the Einstein Equivalence Principle Sperello di Serego Alighieri INAF - Osservatorio Astrofisico di Arcetri with C. de Breuck, J. Vernet, A. Cimatti, G. Miley, W. van Breugel The linear polarization of powerful radio galaxies with z 2 The optical/UV polarization of powerful radio ... The strong equivalence principle (SEP) extending the EEP also to gravitational experiments. ...

... Before the modern era of technological astronomy, to know anything about the Universe beyond our planet we relied on light. ... Historically the two rival ideas were that light was either a stream of tiny bullet-like particles or a wave wobbling its way through space. ... The light we see (visible light which is not the tautology it sounds) is only part of the electromagnetic spectrum, a great sweep of radiations which also includes radio, infra-red, ultra-violet, x-rays and gamma rays. ...

... Solar Wind . ... During a total eclipse of the Sun, when for a few minutes the Moon completely covers the Sun's face, a glow appears around the darkened Sun--the solar corona, the Sun's outermost atmosphere. ... Such high levels of ionization require the atoms to be buffeted around by extremely high temperatures, around 1,000,000 C (1,800,000 F). ... It is brightest near sunspots, whose arched field lines apparently hamper the outflow of solar wind which carries away energy and helps cool the corona...

... Solar Wind . ... During a total eclipse of the Sun, when for a few minutes the Moon completely covers the Sun's face, a glow appears around the darkened Sun--the solar corona, the Sun's outermost atmosphere. ... Such high levels of ionization require the atoms to be buffeted around by extremely high temperatures, around 1,000,000 C (1,800,000 F). ... It is brightest near sunspots, whose arched field lines apparently hamper the outflow of solar wind which carries away energy and helps cool the corona...

... GU Mus optical light curves #Ref: Astron. ... 329, 606-612 ( 1998 ) # M. Della Valle , N. Masetti and A. Bianchini # #B and V transferred to LF by G.V.Lipunova #LF = log (erg/cm^2/sec) #1=HJD 2=B,mag 3=B-err,mag 4 ... ,mag 6=V,R-err,mag #7=(B-V),mag 8=(V-R),mag # 9=B,LF 10=B-err,LF 11=V,LF 12=V-err,LF # 1 2 3 4 5 6 7 8 9 10 11 12 2448271.73 13.66 0.05 13.43 13.24 0.03 0.23 0.19 -10.67277 0.02 -10.86261 0.012 2448272.72 13.84 0.05 13.60 13.33 0.03 0.24 0.27 -10.74477 0.02 -10.93061 ...

... CI Cam is known to be a B[e] star and X-ray transient source. ... Figure 1. The light curve of CI Cam in residuals relative to the mean level of the slow variability (top) . The radial velocity curve of the HeII emission (middle) . ... The V light curve is shown in Figure 1 (top). ... Comparison of two CI Cam spectra in the region of HeII line. ... The radial velocity curve of HeII in CI Cam has a saw-tooth shape that may be an evidence of an elliptical orbit. ...

... The Galactic low-mass X-ray binary GS 2023+338 was discovered during the burst on May 22, 1989 with the Japanise satellite Ginga (aka Galaxy). The flux reached 17 crabs (this unit of flux measurement is an bright X-ray source, Crab Nebula) at 10-35 keV. ... No other radio telescope worldwide carried out multi-frequency measurements. ... Upon 14 days the radio flux fell below the detection level at the RATAN-600 in relation to the decrease of the X-ray flux. ...

... Tonight's Sky . ... Astronomy for Kids . ... Year of Pluto . ... Chandra celebrates the International Year of Light . ... New images are being released to celebrate the International Year of Light 2015. ... This composite image combines data collected at X-ray wavelengths by Chandra (purple), ultraviolet by the galaxy Evolution Explorer (GALEX, blue), visible light by Hubble (green), and infrared by Spitzer (red). ... Only registered members of Astronomy.com are allowed to comment on this article. ...