Evidence for two spatially separated UV continuum emitting regions in the Cloverleaf broad absorption line quasar

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dc.contributor.authorSluse, D.
dc.contributor.authorHutsemekers, D.
dc.contributor.authorAnguita, T.
dc.contributor.authorBraibant, L.
dc.contributor.authorRiaud, P.
dc.date.accessioned2023-03-07T15:49:35Z
dc.date.available2023-03-07T15:49:35Z
dc.date.issued2015-10
dc.descriptionIndexación: Scopuses
dc.description.abstractTesting the standard Shakura-Sunyaev model of accretion is a challenging task because the central region of quasars where accretion takes place is unresolved with telescopes. The analysis of microlensing in gravitationally lensed quasars is one of the few techniques that can test this model, yielding to the measurement of the size and of temperature profile of the accretion disc. We present spectroscopic observations of the gravitationally lensed broad absorption line quasar H1413+117, which reveal partial microlensing of the continuum emission that appears to originate from two separated regions: a microlensed region, corresponding the compact accretion disc; and a non-microlensed region, more extended and contributing to at least 30% of the total UV-continuum flux. Because this extended continuum is occulted by the broad absorption line clouds, it is not associated with the host galaxy, but rather with light scattered in the neighbourhood of the central engine. We measure the amplitude of microlensing of the compact continuum over the rest-frame wavelength range 1000-7000 Å. Following a Bayesian scheme, we confront our measurements to microlensing simulations of an accretion disc with a temperature varying as T ∝ R-1/ν. We find a most likely source half-light radius of R1/2 = 0.61 × 1016cm (i.e., 0.002 pc) at 0.18μm, and a most-likely index of ν = 0.4. The standard disc (ν = 4/3) model is not ruled out by our data, and is found within the 95% confidence interval associated with our measurements. We demonstrate that, for H1413+117, the existence of an extended continuum in addition to the disc emission only has a small impact on the inferred disc parameters, and is unlikely to solve the tension between the microlensing source size and standard disc sizes, as previously reported in the literature. © 2015 ESO.es
dc.description.urihttps://www.aanda.org/articles/aa/full_html/2015/10/aa26832-15/aa26832-15.html
dc.identifier.doihttps://www.aanda.org/articles/aa/full_html/2015/10/aa26832-15/aa26832-15.html
dc.identifier.issn0004-6361
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/47391
dc.language.isoenes
dc.publisherEDP Scienceses
dc.rights.licenseAtribución 4.0 Internacional (CC BY 4.0)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/deed.es
dc.subjectGravitational lensinges
dc.subjectmicroes
dc.subjectGravitational lensinges
dc.subjectstronges
dc.subjectQuasarses
dc.subjectgenerales
dc.titleEvidence for two spatially separated UV continuum emitting regions in the Cloverleaf broad absorption line quasares
dc.typeArtículoes
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Astronomy and Astrophysics Volume 5821 October 2015 Article number A109
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