... 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. ...

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 . ...

... 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??, ...

... High Redshift Quasars . ... 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 ! ... NASA Official: Jay Norris. ... Публикации с ключевыми словами: cosmology - quasar - redshift - красное смещение - квазары - Расширение Вселенной - расстояние . Публикации со словами: cosmology - quasar - redshift - красное смещение - квазары - Расширение Вселенной - расстояние . ...

... These composites, unlike the one above, have had the continuum divided out from the individual spectra before co-addition. ... Unlike the combined composite, the individual spectra have not been inverse variance weighted. ... Standard deviation of the individual QSO fluxes going into that bin. Number of individual QSO spectra contributing to that bin. Average redshift of QSOs contributing to that bin. Lowest redshift contributing . Highest redshift contributing . ...

Once students get the hang of it, they can find and measure the brightness of Delta Cephei in a few minutes. ... of Delta Cephei . ... Oct. ... The following table lists the measurements of Delta Cephei made by one amateur astronomer in autumn 1990. ... 4.0 . ... This activity is a simplified version of one that appeared in Hands-On Astrophysics, a series of activities prepared by the American Association of Variable Star Observers with support from the National Science Foundation. << previous page | ...

... 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 . ...

In order to calculate the line profile of a given absorption line for atomic species Z with a wavelength LAMBDA (in Angstroms) and a microturbulent velocity VT (in km/s). ... mode . ... 1) The input model may contain more than one model (i.e. it may be an entire grid of models). Spectrum will cycle through this grid NMOD times, omitting NSKIP-1 models from the . ... However, the input data following MODE must be repeated NMOD times in order to obtain equivalent results for each model in the grid. ...

... We cannot use for this purpose equivalent widths and profiles of HI lines (well known criteria of atmospheric conditions for normal supergiants), since these lines are strongly distorted in the spectrum of IRAS04296 as seen in Fig. ... Figure: Upper: iron abundance FeI (circles) and FeII (crosses) calculated for IRAS04296+3429 with model parameters , and using lines with different excitation potentials EP of a low level; bottom: the same as a function of the equivalent width W . ...

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) . ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to E-ELT Armazones . ... ESO Acronyms . ... Survey Telescopes . ... Quasars and Black Holes . ... Star Clusters . ... Stars@ESO . ... This chart shows the spectrum of Q0046-282, obtained with FORS1 at VLT UT1. The redshift z = 3.83 has been deduced from the measured wavelengths of the indicated lines of multiple ionized elements. ... QSO 0046-282 , Spectrum . ...

... Galaxy Evolution home . ... Micro quasars Publications . ... In the last few years a very similar phenomenon has been observed in some X-ray binaries, binary stellar systems with one gravitationally-compact object (black hole or neutron star) and an "normal" star part of whos atmosphere is captured by the compact object. ... The compact objects (a few solar masses) are much smaller than those inferred in AGN (10 9 solar masses), and the sizes much smaller, so the analogy may not be complete. ...