Absorption spectrum of the quasar HS1603+3820
نویسندگان
چکیده
منابع مشابه
Quasar Absorption Lines as a Function of Quasar Orientation Measures
We present high resolution radio data at 3.5 and 20 cm from the VLA in the A configuration for 144 quasars with known C IV absorption line properties. Using these measurements, we compare and contrast a number of quasar orientation indicators. These quantities are used to study the velocity distribution of C IV absorption lines as a function of quasar orientation measures. That there is an exce...
متن کاملCloud model of the mean quasar spectrum
We assume a distribution of clouds optically thick for electron scattering (OTCM) which are moderately optically thin for absorption and we consider them as a model of the mean quasar spectrum of Laor et al. (1997). We show that the model is particularly sensitive to the value of the ionization parameter ξ and that for ξ ∼ 500 the model well reproduces the optical/UV/X-ray mean quasar spectrum,...
متن کاملEvolution of quasar absorption-selected galaxies
Wepresent the results of a survey of galaxies selected by their gas cross-section which give rise to Mg ii absorption lines in the spectra of background quasars. The sample comprises 11 galaxies covering the redshift range 0.7 < z < 1.2 with 〈z〉=0.9, and is combined with a lower redshift (z < 0.7) sample of 15 Mg ii absorbing galaxies. We first describe the properties of these two samples of ga...
متن کاملIs X-ray Absorption from Quasar Absorption Line Systems Detectable?
Using the known properties and statistics of intervening quasar absorption systems, we calculate the cumulative absorption out to high redshifts at soft X-ray (E < 1 keV) energies. Although photoelectric absorption in quasar absorption systems provides a signiicant source of opacity at the lowest X-ray energies, the imprint of this absorption is not readily observable since it is generally mask...
متن کاملQuasar Continuum Fitting and Silicon Absorption
We present results on the evolution of Lyae absorption at low redshift, and the first systematic search for Si II absorption systems in the low redshift IGM. Our sample consists of 832 Lyca absorbers from 328 spectra of 204 QSOs taken from the Hubble Space Telescope archive. We develop a new, reproducible method of quasar continuum fitting, designed to quickly identify absorption lines and meas...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20077342