FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2023896728> ?p ?o ?g. }

• W2023896728 abstract "Far-ultraviolet spectra of the gravitational lens components Q0957+561A, B were obtained with the Hubble Space Telescope Faint Object Spectrograph (FOS) at five equally spaced epochs, one every 2 weeks. We confirm the flux variability of the quasar's Lyα and O VI λ1037 emission lines in IUE spectra reported in earlier work of Dolan et al. The fluxes in these lines vary on a timescale of weeks in the observer's rest frame, independently of each other and of the surrounding continuum. The individual spectra of each image were co-added to investigate the properties of the Lyα forest along the two lines of sight to the quasar. Absorption lines having equivalent width Wλ ≥ 0.3 A in the observer's frame not previously identified by Michalitsianos et al. as interstellar lines, metal lines, or higher order Lyman lines were taken to be Lyα forest lines. The existence of each line in this consistently selected set was then verified by its presence in two archival FOS spectra with ~ 1.5 times higher signal to noise than our co-added spectra. Lyα forest lines with Wλ ≥ 0.3 A appear at 41 distinct wavelengths in the spectra of the two images. One absorption line in the spectrum of image A has no counterpart in the spectrum of image B, and one line in image B has no counterpart in image A. Based on the separation of the lines of sight over the redshift range searched for Lyα forest lines, the density of the absorbing clouds in the direction of Q0957+561 must change significantly over a distance R = 160 h kpc in the simplified model where the absorbers are treated as spherical clouds and the characteristic dimension, R, is the radius. (We adopt H0 = 50 h50 km s-1 Mpc-1, q0 = , and Λ = 0 throughout this paper.) The 95% confidence interval on R extends from 50 to 950 h kpc. We show in the Appendix that the fraction of Lyα forest lines that appear in only one spectrum can be expressed as a rapidly converging power series in 1/r, where r the ratio of the radius of the cloud to the separation of the two lines of sight at the redshift of the cloud. This power series can be rewritten to give r in terms of the fraction of Lyα forest wavelengths that appear in the spectrum of only one image. A simple linear approximation to the solution that everywhere agrees with the power series solution to better than 0.8% for r ≥ 2 is derived in the Appendix." @default.
• W2023896728 created "2016-06-24" @default.
• W2023896728 creator A5034962571 @default.
• W2023896728 creator A5054261463 @default.
• W2023896728 creator A5088487350 @default.
• W2023896728 creator A5012084282 @default.
• W2023896728 date "2000-08-10" @default.
• W2023896728 modified "2023-09-28" @default.
• W2023896728 title "Ultraviolet Spectral Variability and the Lyα Forest in the Lensed Quasar Q0957+561" @default.
• W2023896728 cites W1487093425 @default.
• W2023896728 cites W1807210261 @default.
• W2023896728 cites W1964001148 @default.
• W2023896728 cites W1976565727 @default.
• W2023896728 cites W1986164846 @default.
• W2023896728 cites W1990813631 @default.
• W2023896728 cites W2017582444 @default.
• W2023896728 cites W2019556819 @default.
• W2023896728 cites W2027653505 @default.
• W2023896728 cites W2031288810 @default.
• W2023896728 cites W2036247675 @default.
• W2023896728 cites W2037624693 @default.
• W2023896728 cites W2039344452 @default.
• W2023896728 cites W2046902853 @default.
• W2023896728 cites W2046934249 @default.
• W2023896728 cites W2054565233 @default.
• W2023896728 cites W2058852787 @default.
• W2023896728 cites W2060037443 @default.
• W2023896728 cites W2062624832 @default.
• W2023896728 cites W2072543137 @default.
• W2023896728 cites W2094176979 @default.
• W2023896728 cites W2148155488 @default.
• W2023896728 cites W2160269404 @default.
• W2023896728 cites W3097983063 @default.
• W2023896728 cites W3098654032 @default.
• W2023896728 cites W3100766552 @default.
• W2023896728 cites W3101421692 @default.
• W2023896728 doi "https://doi.org/10.1086/309206" @default.
• W2023896728 hasPublicationYear "2000" @default.
• W2023896728 type Work @default.
• W2023896728 sameAs 2023896728 @default.
• W2023896728 citedByCount "6" @default.
• W2023896728 countsByYear W20238967282016 @default.
• W2023896728 crossrefType "journal-article" @default.
• W2023896728 hasAuthorship W2023896728A5012084282 @default.
• W2023896728 hasAuthorship W2023896728A5034962571 @default.
• W2023896728 hasAuthorship W2023896728A5054261463 @default.
• W2023896728 hasAuthorship W2023896728A5088487350 @default.
• W2023896728 hasConcept C121332964 @default.
• W2023896728 hasConcept C1276947 @default.
• W2023896728 hasConcept C135041427 @default.
• W2023896728 hasConcept C169791425 @default.
• W2023896728 hasConcept C33024259 @default.
• W2023896728 hasConcept C44870925 @default.
• W2023896728 hasConcept C4839761 @default.
• W2023896728 hasConcept C68498078 @default.
• W2023896728 hasConcept C96141758 @default.
• W2023896728 hasConcept C98444146 @default.
• W2023896728 hasConceptScore W2023896728C121332964 @default.
• W2023896728 hasConceptScore W2023896728C1276947 @default.
• W2023896728 hasConceptScore W2023896728C135041427 @default.
• W2023896728 hasConceptScore W2023896728C169791425 @default.
• W2023896728 hasConceptScore W2023896728C33024259 @default.
• W2023896728 hasConceptScore W2023896728C44870925 @default.
• W2023896728 hasConceptScore W2023896728C4839761 @default.
• W2023896728 hasConceptScore W2023896728C68498078 @default.
• W2023896728 hasConceptScore W2023896728C96141758 @default.
• W2023896728 hasConceptScore W2023896728C98444146 @default.
• W2023896728 hasLocation W20238967281 @default.
• W2023896728 hasOpenAccess W2023896728 @default.
• W2023896728 hasPrimaryLocation W20238967281 @default.
• W2023896728 hasRelatedWork W1546976671 @default.
• W2023896728 hasRelatedWork W1972804037 @default.
• W2023896728 hasRelatedWork W1986164846 @default.
• W2023896728 hasRelatedWork W1996812467 @default.
• W2023896728 hasRelatedWork W2004116113 @default.
• W2023896728 hasRelatedWork W2009189701 @default.
• W2023896728 hasRelatedWork W2012156365 @default.
• W2023896728 hasRelatedWork W2024703746 @default.
• W2023896728 hasRelatedWork W2032175298 @default.
• W2023896728 hasRelatedWork W2062561449 @default.
• W2023896728 hasRelatedWork W2062976169 @default.
• W2023896728 hasRelatedWork W2094176979 @default.
• W2023896728 hasRelatedWork W2094672460 @default.
• W2023896728 hasRelatedWork W2102001586 @default.
• W2023896728 hasRelatedWork W2112028701 @default.
• W2023896728 hasRelatedWork W2963063994 @default.
• W2023896728 hasRelatedWork W3100552313 @default.
• W2023896728 hasRelatedWork W3121373896 @default.
• W2023896728 hasRelatedWork W83713449 @default.
• W2023896728 hasRelatedWork W1634612941 @default.
• W2023896728 isParatext "false" @default.
• W2023896728 isRetracted "false" @default.
• W2023896728 magId "2023896728" @default.
• W2023896728 workType "article" @default.