The 2dF QSO Redshift Survey (2QZ) . ... Before jumping into all the finer details of teh survey, a brief non-astronomer's guide to redshift surveys is available. ... The primary scientific aims of the QSO survey are: (1) to obtain the primordial fluctuation power spectrum out to COBE scales, (2) to determine the rate of QSO clustering evolution in the non-linear and linear regimes and hence obtain new limits on the value of and the bias parameter, (3) to apply a powerful geometric method to measure . ...

... We construct a composite quasar spectrum from 149 HST FOS spectra of 80 quasars with mean redshift . ... The continuum longward of 1000? can be modeled as a power law with . ... The break in the power--law index is a feature expected in Comptonized accretion--disk spectra. ... The spectral features in the sub--Ly region of AGN spectra provide critical insights into the physical processes around the central engine, and they become accessible to IUE and HST at intermediate redshift. ...

Back to Martin Elvis' Home Page . Color 2-D figure of structure (postscript) . 3-D views of the quasar structure: . 3-D Top view 3-D End-on view 3-D Side view . ... Quasar Atmospheres: Toward a `Low' Theory of Quasars , (Elvis M. 2003 astro-ph/0311436 , to be published in AGN and the SDSS, eds. G. Richards and P. Hall) . Talk from the Leicester `Winds Tori' Workshop, Sept 2004 (pdf, 21 pages) . Disk Winds summary from the Leicester `Winds Tori' Workshop, Sept 2004 (pdf, 7 pages) . ...

... The first ultraviolet average spectrum of z=2.4 quasars . ... A team of astronomers led by Elisabeta Lusso (INAF-Arcetri Observatory) has recently published the first average spectrum of high-redshift quasars in the rest-frame wavelength range 600-2500 У? corrected for intervening HI Lyman forest and continuum absorption with state-of the-art IGM transmission functions calibrated to the most recent observations. ... The first ultraviolet quasar stacked spectrum at z=2.4 from WFC3 т??, ...

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... We present composite spectra of red and blue sub-samples of the PHFS quasars, and tabulate their emission line properties. The median H and [O III ] emission line equivalent widths of the red quasar sub-sample are a factor of ten weaker than those of the blue quasar sub-sample. ... Both the colours and the emission line equivalent widths of the red quasars can be explained by the addition of a featureless red synchrotron continuum component to an otherwise normal blue quasar spectrum. ...

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... NASA Explanation: The quasar known as PKS 1127-145 lies ten billion light- years from our fair planet. ... While the more ordinary galaxies are not seen in the Chandra image, a striking jet, nearly a million of light-years long, emerges from the quasar to dominate the x-ray view. Bright in both optical and x-ray light, the quasar is thought to harbor a supermassive black hole which powers the jet and makes PKS 1127-145 visible across the spectrum -- a beacon from the distant cosmos . ...

Next: Objects without emission lines Up: Results of follow-up spectroscopy Previous: Selection effects . QSOs with strong emission lines might be selected in our sample if either the Ly 1216 ? line redshifted to z 3 or the Mg II 2798 ? ... This produces an easily visible emission peak on the digitized prism spectra even for very faint objects ( B ) which is usually hard to distinguish from low-redshifted [O III ] features. ... emission line shifted to a wavelength near 4000 ?. ...

... The results of long-term monitoring of Gigahertz-Peaked Spectrum sources were found the statistically significant differences (0.05 significance level) in the high-frequency spectral index distribution between subgroups of galaxies and quasars. ... This can mean that the electron energy distribution for GPS galaxies is steeper than for GPS quasars. ... The first area corresponds to GPS-quasars that have statistically larger value of redfhift, second area corresponds to GPS-galaxies. ...

... December 11, 1998 . High Redshift Quasars . Credit: Sloan Digital Sky Survey . ... Astronomers use a number known as "Z" to quantify this cosmological redshift and the quasar at the left, with a Z of 5, was just proclaimed the new quasar redshift champion (from left to right the measured Zs are 5.00, 4.90, 4.75). What's the actual distance to quasars with Zs of 5 or so? ... about 15 billion light-years, give or take a few billion light-years depending on your favorite cosmology ! ...

... This is combined emission from all the gas clouds circling the black hole, between 0.1 and 10 light years out. ... These are the expanding clouds of gas left behind when a massive star comes to the end of its life and explodes, producing a supernova. ... Also known as the Veil nebula, a vast and beautiful whispy nebula left over from an exploding star. ... The Crab Nebula (120kb). ... Carbon Star (120kb) Red giant stars, surrounded by clouds or carbon dust. ... 3500 K star (64kb) , like Aldebaran. ...

... There are result from two global VLBI observations at 3.6 cm spaced about 2 years. ... The analysis of the apparent motion, indication of the jet flow trajectory and the other implications for the CSS quasars are discussed. ... The quasar 3C380 ( ; thus 1 arcsec corresponds to 4 kpc for , ) is one of the most powerful radio sources (its radio luminosity at 2.7 GHz is ) ( Wilkinson et al. ... 3C380 is a member of the class of Compact Steep Spectrum (CSS) sources. ...

Stellarium 0.12.3 . ... Plugins . ... FileљStructure . FileљList . FileљMembers . plugins . Quasars . src . Quasar.hpp . ... 19 љ #ifndef _QUASAR_HPP_ . 20 љ #define _QUASAR_HPP_ 1 . ... 39 љ class Quasar : public StelObject . ... 41 љ friend class Quasars ; . ... 44 љ Quasar ( const QVariantMap& map); . 45 љ ~ Quasar (); . ... 53 љ return "Quasar" ; . ... 103 љ #endif // _QUASAR_HPP_ . Generated on Sat Aug 10 2013 17:12:43 for Stellarium by љ 1.8.3.1 ...

Next: References Up: On the problem of Previous: The spectrograph design and . Figure: Fragment of the echelle spectrum of protoplanetary nebula RAFGL 618 in H . In Fig. 3 are shown fragments of the echelle spectra of the quasar S5 0014+81 ( ) obtained with the PF echelle spectrograph within the frames of the programme of study of absorption spectra of bright quasars (authors of the programme are D.A.Varshalovich and A.V.Ivanchik). ...

... In one situation, we can use light from quasars to probe the material between us and them because that light may pass through one or more galaxies or gas clouds on its way to us. The gas inside the galaxies or the intergalactic clouds acts then as a filter, absorbing selected wavelengths from the quasar light. ... Light from a quasar must pass through clouds of gas and even faint galaxies -- each leaving its imprint on the light -- before we receive it here on Earth. ... Gravitational lensing . ...

... Up: Data Pipelines . ... 172, Astronomical Data Analysis Software and Systems VIII, eds. D. M. Mehringer, R. L. Plante, & D. A. Roberts (San Francisco: ASP), 207 . ... Fully automated software running on a Linux Pentium II reduces and analyses the data faster than it is acquired. ... The QUEST collaboration (Snyder 1998) is obtaining broad bandpass (4000 - 9500?), intermediate dispersion (25 ?/arcsec at H ) slitless spectroscopy covering 300 deg 2 per night to . ...

Многофункциональный программный пакет QUASAR, созданный в Институте прикладной астрономии РАН, предназначен для массовой обработки РСДБ-наблюдений, выполненных на глобальных и региональных сетях станций. ... вычисление частных производных для всех параметров и сигналов; . ... оценивание всех сигналов, сессионных и глобальных параметров; . ... организация итерационного процесса с последовательным уточнением АКФ сигналов и/или глобальных параметров (координат станций и источников); . ...

... Ciel Espace, le magazine qui vous guide toujours plus loin . ... Ciel Espace, nouvelle formule, c'est . des actualit†йs . des reportages . ... des pages consacr†йes †а la publication de vos photos Mais c'est aussi une vraie communaut†й avec laquelle partager votre passion et nourrir votre curiosit†й. Accueil D†йcouverte de trois quasars qui fabriquent des mirages . ... 06/04/2016 - Le journal de bord de Thomas Pesquet (21) . ... 24/03/2016 - D†йcouverte de lacs et de rivi†иres sur Pluton . ...

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