A low-luminosity type-1 QSO sample: III. Optical spectroscopic properties and activity classification

We report on the optical spectroscopic analysis of a sample of 99 low-luminosity quasi-stellar objects (LLQSO5) at z [< or =] 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 l...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2015-08, Vol.580, p.A113
Main Authors: Tremou, E, Garcia-Marin, M, Zuther, J, Eckart, A, Valencia-Schneider, M, Vitale, M, Shan, C
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astronomy
Classification
Galaxies
Optical properties
Spectroscopy
Wavelengths
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Summary:We report on the optical spectroscopic analysis of a sample of 99 low-luminosity quasi-stellar objects (LLQSO5) at z [< or =] 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. In comparing two spectroscopic methods, we aim to establish a reliable activity classification scheme of the LLQSO5 sample. Our goal is to enrich our systematic multi-wavelength analysis of the AGN/star-burst relation in these systems and give a complementary information on this particular sample of LLQSOs from the Hamburg [SO survey. Here, we present results of the analysis of visible wavelength spectroscopy provided by the HES and the 6 Degree Field Galaxy Survey (6dFGS). 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.
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361/201525707