J/A+A/580/A113ivo://CDS.VizieR/J/A+A/580/A113doi:10.26093/cds/vizier.35800113CDSTremou E.Garcia-Marin M.Zuther J.Eckart A.Valencia-Schneider M.,Vitale M.Shan C.2023-05-05T10:00:53Z2015-12-11T08:03:47ZCDS support team

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

cds-question@unistra.frquasarsactive-galactic-nucleiseyfert-galaxiesspectroscopyWe report on the optical spectroscopic analysis of a sample of 99 low-luminosity quasi-stellar objects (LLQSOs) at z<=0.06 base the Hamburg/ESO QSO Survey (HES). To better relate the low-redshift active galactic nucleus (AGN) to the QSO population it is important to study samples of the latter type at a level of detail similar to that of the low-redshift AGN. Powerful QSOs, however, are absent at low redshifts due to evolutionary effects and their small space density. Our understanding of the (distant) QSO population is, therefore, significantly limited by angular resolution and sensitivity. The LLQSOs presented here offer the possibility of studying the faint end of this population at smaller cosmological distances and, therefore, in greater detail. In comparing two spectroscopic methods, we aim to establish a reliable activity classification scheme of the LLQSOs sample. Our goal is to enrich our systematic multiwavelength analysis of the AGN/starburst relation in these systems and give a complementary information on this particular sample of LLQSOs from the Hamburg ESO survey. Here, we present results of the analysis of visible wavelength spectroscopy provided by the HES and the 6 Degree Field Galaxy Survey (6dFGS). These surveys use different spectroscopic techniques, long-slit and circular fiber, respectively. These allow us to assess the influence of different apertures on the activity of the LLQSOs using classical optical diagnostic diagrams. We perform a Gaussian fitting of strong optical emission lines and decompose narrow and broad Balmer components. A small number of our LLQSO present no broad component, which is likely to be present but buried in the noise. Two sources show double broad components, whereas six comply with the classic NLS1 requirements. As expected in NLR of broad line AGNs, the [SII]-based electron density values range between 100 and 1000N_e_/cm^3^. Using the optical characteristics of Populations A and B, we find that 50% of our sources with H{beta} broad emission are consistent with the radio-quiet sources definition. The remaining sources could be interpreted as low-luminosity radio-loud quasar. The BPT-based classification renders an AGN/Seyfert activity between 50 to 60%. For the remaining sources, the possible starburst contribution might control the LINER and HII classification. Finally, we discuss the aperture effect as responsible for the differences found between data sets, although variability in the BLR could play a significant role as well.2015A&A...580A.113Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/580/A113CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/259 : 6dF galaxy survey final redshift release (Jones+, 2009)J/A+AS/115/235 : The Hamburg/ESO survey for bright QSOs. II. (Reimers+, 1996)J/A+A/561/A140 : Low-luminosity type-1 QSO sample (Busch+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/580/A113https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/580/A113http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/580/A113https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/580/A113https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/580/A113http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/580/A113GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/580/A113/table1 (Main characteristics of the LLQSOs sample: HES and 6dFGS names, J2000 coordinates and redshift)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/580/A113/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/580/A113/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/580/A113/table1?GETtext/xml+votable180.050000true1.42917-50.11530.0055555555555555566/16533 16573 16668 16694 16759 16817 16819 16894 17408 17448 17603 17727 17793 17814 17928 18001 18009 18524 18683 19028 19077 19204 21847 22583 22632 22637 22708 22740 22774 22914 23233 23237 24941 25051 25090 25153 25182 25619 25661 25735 26148 26624 26711 26859 26863 26902 27191 27293 33624 33716 33968 34034 34127 34264 34414 34427 34430 34458 34499 34513 34845 34938 35001 35047 35263 35360 35386 35714 35983 36015 36080 36108 36323 36332 36619 36775 36786 39073 40281 40955 43877 43921 43983 44698 44722 44971 45852 46095 46344 46544 46568 46572 46587 46709 46831 46861 46873 46918 46988https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/580/A113?format=asciidefaultJ/A+A/580/A113/table1Main characteristics of the LLQSOs sample: HES and 6dFGS names, J2000 coordinates and redshiftSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintprimaryHESHES name (HENNNN-NNN)meta.id;meta.maincharn_HES[123] Note on HES (1)meta.notecharf_Seq[+] + marks galaxies for which we do not have HES optical spectrameta.codechar6dFGS6dFGS name (gHHMMSSs+DDMMSS)meta.idcharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainzRedshiftsrc.redshiftfloatResultsindicates fitting results in tables 4 or 5meta.ref.urlcharJ/A+A/580/A113/table4Fitting results of 6dFGS surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintComComments (G1)meta.notecharFlag[d+ ] Flag (G2)meta.code.errorcharSeqSequential numbermeta.recordint[NII]/Ha? [NII]/H{alpha} luminosity ratiospect.line.intensity;arith.ratiofloatnullable[OIII]/Hb? [OIII]/H{beta} luminosity ratiospect.line.intensity;arith.ratiofloatnullable[SII]/Ha? [SII]/H{alpha} luminosity ratiospect.line.intensity;arith.ratiofloatnullable[OI]/Ha? [OI]/H{alpha} luminosity ratiospect.line.intensity;arith.ratiofloatnullableFWHMHan? Narrow component H{alpha} FWHMkm/sspect.line.widthfloatnullableFWHMHab? Broad component H{alpha} FWHMkm/sspect.line.widthfloatnullableu_FWHMHab[?] Uncertainty flag on FWHMHabmeta.code.errorcharFWHMHbn? Narrow component H{beta} FWHMspect.line.widthfloatnullableFWHMHbB? Broad component H{beta} FWHMspect.line.widthfloatnullableJ/A+A/580/A113/table5Fitting results of HES surveyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintComComments (G1)meta.notecharFlag[d+ ] Flag (G2)meta.code.errorcharSeqsequential numbermeta.recordint[NII]/Ha? [NII]/H{alpha} luminosity ratiospect.line.intensity;arith.ratiofloatnullable[OIII]/Hb? [OIII]/H{beta} luminosity ratiospect.line.intensity;arith.ratiofloatnullableFWHMHan? Narrow component H{alpha} FWHMkm/sspect.line.widthintnullableFWHMHab? Broad component H{alpha} FWHMkm/sspect.line.widthintnullableFWHMHbn? Narrow component H{beta} FWHMkm/sspect.line.widthintnullableFWHMHbb? Broad component H{beta} FWHMkm/sspect.line.widthintnullableNoteNotesmeta.notechar