Afficher la notice abrégée

Near-infrared astrometry and photometry of Southern ICRF quasars

hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorCAMARGO, J. I. B.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorDAIGNE, G.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorDUCOURANT, C.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorCHARLOT, P.
dc.date.issued2005
dc.identifier.issn0004-6361
dc.description.abstractEnWe present high quality astrometry, along with J, H, and Ks photometry, for 30 southern ICRF quasars observed with the ESO NTT/SOFI at La Silla. Our main purpose is to document the optical counterpart of ICRF quasars, by reporting their position in a stellar reference frame and their near-infrared photometry. Our investigation lies within the scope of extending the (radio) extragalactic reference frame into the optical range. An internal precision generally better than 10 mas was obtained in positioning the near-infrared counterpart of these quasars within their stellar surroundings. The actual astrometric accuracy is estimated from the departure between the observed and the radio (VLBI) positions of quasars, and is about 35 mas, mainly due to the statistical uncertainties of the stellar reference catalogue (UCAC2). The positional accuracy was improved to 25 mas for a subset of 14 quasars observed with extended fields of view, as obtained from mosaics of overlapping images. The 3-band photometry was achieved with a precision most often better than 0.04 mag, based on calibration with the 2MASS magnitudes. A spectral index α (Fν ∝ να) was derived from the observed quasar fluxes in the near-infrared. With a mean value α = −1, this spectral index does not show any significant correlation with the radio spectral index.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enastrometry
dc.subject.eninfrared: general
dc.subject.enmethods: numerical
dc.subject.enreference systems
dc.subject.enastrometry -infrared
dc.subject.engeneral -methods
dc.subject.ennumerical -reference systems
dc.title.enNear-infrared astrometry and photometry of Southern ICRF quasars
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361:20042426
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page1135-1146
bordeaux.volume437
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-00401884
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00401884v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2005&rft.volume=437&rft.issue=3&rft.spage=1135-1146&rft.epage=1135-1146&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=CAMARGO,%20J.%20I.%20B.&DAIGNE,%20G.&DUCOURANT,%20C.&CHARLOT,%20P.&rft.genre=article


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée