The agn nature of 11 out of 12 <i>SWIFT/RXTE</i> unidentified sources through optical and X-ray spectroscopy

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dc.contributor.authorLandi, R.
dc.contributor.authorMasetti, N.
dc.contributor.authorMorelli, L.
dc.contributor.authorPalazzi, E.
dc.contributor.authorBassani, L.
dc.contributor.authorMalizia, A.
dc.contributor.authorBazzano, A.
dc.contributor.authorBird, A. J.
dc.contributor.authorDean, A. J.
dc.contributor.authorGalaz, G.
dc.contributor.authorMinniti, D.
dc.contributor.authorUbertini, P.
dc.date.accessioned2025-01-21T01:05:22Z
dc.date.available2025-01-21T01:05:22Z
dc.date.issued2007
dc.description.abstractThe Swift Burst Alert Telescope (BAT) is performing a high Galactic latitude survey in the 14-195 keV band at a flux limit of similar to 10(-11) ergs cm(-2) s(-1), leading to the discovery of new high-energy sources, most of which have not yet been properly classified. A similar work has also been performed with the RXTE slew survey, leading to the discovery of 68 sources detected above 8 keV, many of which are still unclassified. Follow-up observations with the Swift X-ray Telescope (XRT) provide, for many of these objects, source localization with a positional accuracy of a few arcseconds, thus allowing the search for optical counterparts to be more efficient and reliable. We present the results of optical/X-ray follow-up studies of 11 Swift BAT detections and one AGN detected in the RXTE Slew Survey, aimed at identifying their longer wavelength counterparts and at assessing their nature. These data allowed, for the first time, the optical classification of eight objects and a distance determination for three of them. For another object, a more refined optical classification than that available in the literature is also provided. For the remaining sources, optical spectroscopy provides a characterization of the source near in time to the X-ray measurement. The sample consists of six Seyfert 2 galaxies, five Seyferts of intermediate type 1.2-1.8, and one object of Galactic nature -an intermediate polar (i.e., magnetic) cataclysmic variable. Out of the 11 AGNs, 8 (similar to 70%), including 2 Seyferts of type 1.2 and 1.5, are absorbed with N-H > 10(22) cm(-2). Up to 3 objects could be Compton thick (i.e., N-H > 1.5 x 10(24) cm(-2)), but only in one case (Swift J0609.1-8636) does all the observational evidence strongly suggest this possibility. The present data demonstrate the capability of coordinated hard X-ray and optical observations to discover absorbed AGNs.
dc.description.funderSTFC
dc.fuente.origenWOS
dc.identifier.issn0004-637X
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95898
dc.identifier.wosidWOS:000250480600011
dc.issue.numero1
dc.language.isoen
dc.pagina.final125
dc.pagina.inicio109
dc.revistaAstrophysical journal
dc.rightsacceso restringido
dc.subjectgalaxies : Seyfert novae
dc.subjectcataclysmic variables
dc.subjectX-rays : individual ( swift j0444.1+2813
dc.subjectSwift J0601.9 8636
dc.subjectSwift J0732.5-1331
dc.subjectSwift J0823.4-0457
dc.subjectSwift J0918.5+1618
dc.subjectSwift J1009.3-4250
dc.subjectSwift J1038.8-4942
dc.subjectSwift J1200.8+0650
dc.subjectSwift J1238.9-2720
dc.subjectSwift J1930.5+3414
dc.subjectSwift J1933.9+3258
dc.subjectXSS J12303-4232)
dc.titleThe agn nature of 11 out of 12 <i>SWIFT/RXTE</i> unidentified sources through optical and X-ray spectroscopy
dc.typeartículo
dc.volumen669
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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