J/A+A/551/A95ivo://CDS.VizieR/J/A+A/551/A95doi:10.26093/cds/vizier.35510095CDSRamirez J.M.2017-06-01T08:51:57Z2013-03-01T09:40:07ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frseyfert-galaxiesx-ray-sourcesspectroscopyWe present an analysis of the 100ks X-ray spectrum of the narrow-line Seyfert 1 Galaxy Ark 564, taken with the Low Energy Transmission Grating Spectrometer (LETGS) on board Chandra. Using chisquare statistics, several continuum models of the time-averaged spectrum of this object are compared, obtaining a semi-empirical solution for the description of the intrinsic emission continuum and a physical solution for the intrinsic absorption of the system. We find that the 0.1-10keV spectrum can be well described by a power law plus two thermal components that account for the soft step. We are also able to detect and measure several narrow, unresolved absorption lines arising from highly ionized species of C, N, O, and Fe. The material seems to have a velocity consistent with the systemic velocity of the galaxy. This piece of evidence, in addition to the very low observed column density of Nh~10^20^cm^-2^, is in good agreement with the scenario of a transverse biconical outflow with a gas density of n<3x10^12^cm^-3^ at distances beyond the broad-line region r>10lt-days, but a dust torus origin cannot be ruled out.2013A&A...551A..95Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/551/A95CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2012)V/138 : Cross-matched radio/infrared/X-ray sources (Combi+, 2011)VII/173 : Catalogue of Seyfert Galaxies (Lipovetsky+, 1988)J/ApJ/590/73 : RASS AGN sample. II. (Xu+, 2003)J/A+A/418/465 : Mid-infrared and hard X-ray emission in AGN (Lutz+, 2004)J/A+A/495/421 : Catalog of AGN in XMM-Newton archive (CAIXA) (Bianchi+, 2009)J/ApJ/713/L11 : X-ray properties of Seyfert 1 galaxies (Zhou+, 2010)J/AJ/141/129 : Chandra Transmission Grating Data Catalog (Huenemoerder+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/551/A95https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/551/A95http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/551/A95https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/551/A95https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/551/A95http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/551/A95GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapX-rayOpticaldefaultJ/A+A/551/A95/spectrumLETGS (Low Energy Transmission Grating in Chandra, 0.07-0.2keV) 100ks spectrum of Ark 564recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintlambda[1.275/122.107] Wavelength ({AA})0.1nmem.wldoublee_lambdaError on lambda0.1nmstat.errordoublecountsCounts per seconds per spectral bin (1{AA})10count.s**-1.nm**-1phot.count;em.X-raydoublee_countsErrors on counts10count.s**-1.nm**-1stat.error;phot.countdoubleMcountsBest fit physical model10count.s**-1.nm**-1phot.count;em.X-raydouble