Matches in SemOpenAlex for { <https://semopenalex.org/work/W1990918881> ?p ?o ?g. }
Showing items 1 to 80 of
80
with 100 items per page.
- W1990918881 abstract "The question of whether there exists a large population of dust obscured QSOs is currently very controversial. In favour of this hypothesis are models for the origin of the X-ray Background (XRB) and also the Unified Model of AGN which both invoke large populations of obscured QSOs. For example, Madau et al. (1994) suggest a population of QSOs with NH ∼ 1024 cm−2 or AV = 1000m to improve the fit to the XRB between 1 < E < 100 keV. Arguments contradicting this theory include those of Boyle & di Matteo (1995) who claim that the tight X-ray/optical flux ratio relation for QSOs precludes the existence of a large population of objects obscured by significant amounts of intrinsic dust. Here, we follow Madau et al. (1994) and Comastri et al. (1995) to make fits to the XRB using obscured QSO populations and investigate whether selection effects may allow a tight distribution of X-ray/optical ratios to be maintained. We find that even for a flat distribution of absorbing columns, reasonable fits to the XRB can be obtained while both optical and X-ray absorption combine to produce the tight observed X-ray/optical correlation." @default.
- W1990918881 created "2016-06-24" @default.
- W1990918881 creator A5079224064 @default.
- W1990918881 creator A5082034681 @default.
- W1990918881 date "1999-01-01" @default.
- W1990918881 modified "2023-09-27" @default.
- W1990918881 title "Obscured QSOs and the X-ray Background" @default.
- W1990918881 cites W1485937831 @default.
- W1990918881 cites W1625811722 @default.
- W1990918881 cites W1970483156 @default.
- W1990918881 cites W1979380250 @default.
- W1990918881 cites W1983182912 @default.
- W1990918881 cites W1999212794 @default.
- W1990918881 cites W2086519344 @default.
- W1990918881 cites W2091957074 @default.
- W1990918881 cites W2104879350 @default.
- W1990918881 cites W2166372281 @default.
- W1990918881 cites W2167422930 @default.
- W1990918881 cites W2963757039 @default.
- W1990918881 cites W3021701531 @default.
- W1990918881 cites W3102588417 @default.
- W1990918881 doi "https://doi.org/10.1016/s0273-1177(99)00229-x" @default.
- W1990918881 hasPublicationYear "1999" @default.
- W1990918881 type Work @default.
- W1990918881 sameAs 1990918881 @default.
- W1990918881 citedByCount "4" @default.
- W1990918881 crossrefType "journal-article" @default.
- W1990918881 hasAuthorship W1990918881A5079224064 @default.
- W1990918881 hasAuthorship W1990918881A5082034681 @default.
- W1990918881 hasConcept C121332964 @default.
- W1990918881 hasConcept C1276947 @default.
- W1990918881 hasConcept C135041427 @default.
- W1990918881 hasConcept C144024400 @default.
- W1990918881 hasConcept C149923435 @default.
- W1990918881 hasConcept C191897082 @default.
- W1990918881 hasConcept C192562407 @default.
- W1990918881 hasConcept C2776968204 @default.
- W1990918881 hasConcept C2908647359 @default.
- W1990918881 hasConcept C44870925 @default.
- W1990918881 hasConcept C68709404 @default.
- W1990918881 hasConcept C98444146 @default.
- W1990918881 hasConceptScore W1990918881C121332964 @default.
- W1990918881 hasConceptScore W1990918881C1276947 @default.
- W1990918881 hasConceptScore W1990918881C135041427 @default.
- W1990918881 hasConceptScore W1990918881C144024400 @default.
- W1990918881 hasConceptScore W1990918881C149923435 @default.
- W1990918881 hasConceptScore W1990918881C191897082 @default.
- W1990918881 hasConceptScore W1990918881C192562407 @default.
- W1990918881 hasConceptScore W1990918881C2776968204 @default.
- W1990918881 hasConceptScore W1990918881C2908647359 @default.
- W1990918881 hasConceptScore W1990918881C44870925 @default.
- W1990918881 hasConceptScore W1990918881C68709404 @default.
- W1990918881 hasConceptScore W1990918881C98444146 @default.
- W1990918881 hasLocation W19909188811 @default.
- W1990918881 hasOpenAccess W1990918881 @default.
- W1990918881 hasPrimaryLocation W19909188811 @default.
- W1990918881 hasRelatedWork W1529201040 @default.
- W1990918881 hasRelatedWork W1615014266 @default.
- W1990918881 hasRelatedWork W1973771337 @default.
- W1990918881 hasRelatedWork W2038575050 @default.
- W1990918881 hasRelatedWork W2047973283 @default.
- W1990918881 hasRelatedWork W2059365424 @default.
- W1990918881 hasRelatedWork W2066186151 @default.
- W1990918881 hasRelatedWork W2069479751 @default.
- W1990918881 hasRelatedWork W2128570190 @default.
- W1990918881 hasRelatedWork W2132722706 @default.
- W1990918881 hasRelatedWork W2138106908 @default.
- W1990918881 hasRelatedWork W2147306822 @default.
- W1990918881 hasRelatedWork W2155288520 @default.
- W1990918881 hasRelatedWork W2168158082 @default.
- W1990918881 hasRelatedWork W2178566002 @default.
- W1990918881 hasRelatedWork W2994003042 @default.
- W1990918881 hasRelatedWork W3100817164 @default.
- W1990918881 hasRelatedWork W3104727334 @default.
- W1990918881 hasRelatedWork W3105351310 @default.
- W1990918881 hasRelatedWork W339321093 @default.
- W1990918881 isParatext "false" @default.
- W1990918881 isRetracted "false" @default.
- W1990918881 magId "1990918881" @default.
- W1990918881 workType "article" @default.