Matches in SemOpenAlex for { <https://semopenalex.org/work/W1998384782> ?p ?o ?g. }
Showing items 1 to 80 of
80
with 100 items per page.
- W1998384782 abstract "Context. Thanks to huge surveys, such as the Sloan Digital Sky Survey (SDSS), the last decade has shown a dramatic increase in the number of known quasars. In the second release of the general compiled catalogue Large Quasar Astrometric Catalogue (LQAC), 187 504 objects are recorded.Aims. From this catalogue, we carry out statistical studies dealing with several topics: the astrometric accuracy of the quasars, their spatial location, the distribution of the distance to the closest neighbour, the identification of binary quasars, the completness of catalogues at a given magnitude and the estimation of the number of quasars expected to be detected by the astrometric space mission Gaia .Methods. We analyse the astrometric improvements brought by the LQAC-2 in terms of equatorial coordinates off-sets. We plot the bi-dimensional spatial distribution of the LQAC-2 quasars according to their equatorial, galactic, and ecliptic coordinates, thus exploring the anisotropy of the distribution. We compare the observed distribution of closest neighbours with the theoretical values based on a Poisson distribution. Moreover, we perform a comparison between two catalogues, the SDSS and the 2dF inside a huge common field. By extrapolating to the whole sky we deduce the number of quasars that will be detected by Gaia .Results. We show how the equatorial, ecliptic, and galactic distribution of recorded quasars is strongly affected by the galactic extinction as well as by the deficiency of detections in the southern hemisphere. In homogenous zones covered by the SDSS survey we identify a significant excess of closest neighbours at short angular distances, with respect to the theoretical estimation, which is caused by the presence of binary quasars. Moreover, we detail the incompletness of systematic survey catalogues at any magnitude threshold, when comparing two huge surveys such as the SDSS and 2dF. Following this study we deduce the number of quasars detected by Gaia under a given magnitude threshold. For V = 20, this number should be at least 1 million objects." @default.
- W1998384782 created "2016-06-24" @default.
- W1998384782 creator A5044100084 @default.
- W1998384782 creator A5059430464 @default.
- W1998384782 creator A5070584880 @default.
- W1998384782 date "2014-04-01" @default.
- W1998384782 modified "2023-10-16" @default.
- W1998384782 title "A whole sky study of quasars known population starting from the LQAC-2 compiled catalogue" @default.
- W1998384782 cites W1762019482 @default.
- W1998384782 cites W1969206417 @default.
- W1998384782 cites W1972474208 @default.
- W1998384782 cites W1978875836 @default.
- W1998384782 cites W1996519804 @default.
- W1998384782 cites W2000316817 @default.
- W1998384782 cites W2000795976 @default.
- W1998384782 cites W2009219498 @default.
- W1998384782 cites W2009800905 @default.
- W1998384782 cites W2042777467 @default.
- W1998384782 cites W2044018586 @default.
- W1998384782 cites W2045233365 @default.
- W1998384782 cites W2111817932 @default.
- W1998384782 cites W2126593135 @default.
- W1998384782 cites W2132711591 @default.
- W1998384782 cites W2167888367 @default.
- W1998384782 cites W2984041077 @default.
- W1998384782 cites W3037192494 @default.
- W1998384782 cites W3098538645 @default.
- W1998384782 cites W3100530750 @default.
- W1998384782 cites W3101557043 @default.
- W1998384782 cites W3102526028 @default.
- W1998384782 cites W4231986549 @default.
- W1998384782 doi "https://doi.org/10.1051/0004-6361/201323238" @default.
- W1998384782 hasPublicationYear "2014" @default.
- W1998384782 type Work @default.
- W1998384782 sameAs 1998384782 @default.
- W1998384782 citedByCount "2" @default.
- W1998384782 countsByYear W19983847822015 @default.
- W1998384782 countsByYear W19983847822019 @default.
- W1998384782 crossrefType "journal-article" @default.
- W1998384782 hasAuthorship W1998384782A5044100084 @default.
- W1998384782 hasAuthorship W1998384782A5059430464 @default.
- W1998384782 hasAuthorship W1998384782A5070584880 @default.
- W1998384782 hasBestOaLocation W19983847821 @default.
- W1998384782 hasConcept C121332964 @default.
- W1998384782 hasConcept C1276947 @default.
- W1998384782 hasConcept C135041427 @default.
- W1998384782 hasConcept C144024400 @default.
- W1998384782 hasConcept C149923435 @default.
- W1998384782 hasConcept C2908647359 @default.
- W1998384782 hasConcept C44870925 @default.
- W1998384782 hasConcept C73329638 @default.
- W1998384782 hasConcept C98444146 @default.
- W1998384782 hasConceptScore W1998384782C121332964 @default.
- W1998384782 hasConceptScore W1998384782C1276947 @default.
- W1998384782 hasConceptScore W1998384782C135041427 @default.
- W1998384782 hasConceptScore W1998384782C144024400 @default.
- W1998384782 hasConceptScore W1998384782C149923435 @default.
- W1998384782 hasConceptScore W1998384782C2908647359 @default.
- W1998384782 hasConceptScore W1998384782C44870925 @default.
- W1998384782 hasConceptScore W1998384782C73329638 @default.
- W1998384782 hasConceptScore W1998384782C98444146 @default.
- W1998384782 hasLocation W19983847821 @default.
- W1998384782 hasLocation W19983847822 @default.
- W1998384782 hasLocation W19983847823 @default.
- W1998384782 hasOpenAccess W1998384782 @default.
- W1998384782 hasPrimaryLocation W19983847821 @default.
- W1998384782 hasRelatedWork W1563513999 @default.
- W1998384782 hasRelatedWork W2004374876 @default.
- W1998384782 hasRelatedWork W2036348483 @default.
- W1998384782 hasRelatedWork W2043027237 @default.
- W1998384782 hasRelatedWork W2748952813 @default.
- W1998384782 hasRelatedWork W3102988792 @default.
- W1998384782 hasRelatedWork W4283076930 @default.
- W1998384782 hasRelatedWork W4313263505 @default.
- W1998384782 hasRelatedWork W60680191 @default.
- W1998384782 hasRelatedWork W98717675 @default.
- W1998384782 isParatext "false" @default.
- W1998384782 isRetracted "false" @default.
- W1998384782 magId "1998384782" @default.
- W1998384782 workType "article" @default.