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dc.contributor.authorFraquelli, Henrique Aitapt_BR
dc.contributor.authorStorchi-Bergmann, Thaisapt_BR
dc.contributor.authorLevenson, Nancy A.pt_BR
dc.date.accessioned2014-03-29T01:51:43Zpt_BR
dc.date.issued2003pt_BR
dc.identifier.issn0035-8711pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/89978pt_BR
dc.description.abstractWe use long-slit spectroscopic optical data to derive the properties of the extended emitting gas and the nuclear luminosity of a sample of 18 Seyfert 2 galaxies. From the emissionline luminosities and ratios we derive the density, reddening and mass of the ionized gas as a function of distance up to 2–4 kpc from the nucleus. Taking into account the geometric dilution of the nuclear radiation, we derive the radial distribution of covering factors and the minimum rate of ionizing photons emitted by the nuclear source. This number is an order of magnitude larger than that obtained from the rate of ionizing photons ‘intercepted’ by the gas and measured from the Hα luminosity. A calibration is proposed to recover this number from the observed luminosity. The He II λ4686/Hβ line ratio was used to calculate the slope of the ionizing spectral energy distribution (SED), which in combination with the number of ionizing photons allows the calculation of the hard X-ray luminosities. These luminosities are consistent with those derived from X-ray spectra in the eight cases for which such data are available and recover the intrinsic X-ray emission in Compton-thick cases. Our method can thus provide reliable estimates of the X-ray fluxes in Seyfert 2 galaxies for the cases where it is not readily available. We also use the ionizing SED and luminosity to predict the infrared luminosity under the assumption that it is dominated by reprocessed radiation from a dusty torus, and find a good agreement with the observed IRAS luminosities.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofMonthly notices of the Royal Astronomical Society. Oxford. Vol. 341, no. 2 (May 2003), p. 449-463pt_BR
dc.rightsOpen Accessen
dc.subjectGalaxies: activeen
dc.subjectNucleo galaticopt_BR
dc.subjectGalaxies: ISMen
dc.subjectAstronomia infravermelhapt_BR
dc.subjectGalaxias seyfertpt_BR
dc.subjectGalaxies: seyferten
dc.subjectX-rays: galaxiesen
dc.titleExtended gas in Seyfert 2 galaxies : implications for the nuclear sourcept_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000371749pt_BR
dc.type.originEstrangeiropt_BR


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