A coronagraphic absorbing cloud reveals the narrow-line region and extended Lyman α emission of QSO J0823 0529Reportar como inadecuado




A coronagraphic absorbing cloud reveals the narrow-line region and extended Lyman α emission of QSO J0823 0529 - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Resumen

We report long-slit spectroscopic observations of the quasar SDSS J082303.22+052907.6zC IV ∼ 3.1875, whose broad-line region BLR is partly eclipsed by a strong damped Lymanα DLA; logNH I = 21.7 cloud. This allows us to study the narrow-line region NLR ofthe quasar and the Lyman α emission from the host galaxy. Using CLOUDY models that explainthe presence of strong N V and P V absorption together with the detection of Si II∗ and O I∗∗absorption in the DLA, we show that the density and the distance of the cloud to the quasar arein the ranges 180 < nH < 710 cm−3 and 580 > r0 > 230 pc, respectively. Sizes of the neutral∼2–9pc and highly ionized phases ∼3–80pc are consistent with the partial coverage of theC IV BLR by the C IV absorption from the DLA covering factor of ∼0.85. We show that theresiduals are consistent with emission from the NLR with CIV-Lyman α ratios varying from 0to 0.29 through the profile. Remarkably, we detect extended Lyman α emission up to 25 kpcto the north and west directions and 15 kpc to the south and east. We interpret the emissionas the superposition of strong emission in the plane of the galaxy up to 10 kpc with emissionin a wind of projected velocity ∼500 km s−1 which is seen up to 25 kpc. The low metallicityof the DLA 0.27 solar argues for at least part of this gas being infalling towards the activegalactic nucleus and possibly being located where accretion from cold streams ends up.Nota general

Artículo de publicación ISI



Autor: Fathivavsari, H.; - Petitjean, P.; - Noterdaeme, P.; - Paris, I.; - Finley, H.; - López Morales, Sebastián; - Srianand, R.; - S

Fuente: http://repositorio.uchile.cl/



DESCARGAR PDF




Documentos relacionados