Universität zu Köln

Busch, Gerold ORCID: 0000-0001-6679-5481, Fazeli, Nastaran, Eckart, Andreas ORCID: 0000-0001-6049-3132, Valencia-S, Monica, Smajic, Semir, Moser, Lydia, Scharwaechter, Julia, Dierkes, Jens ORCID: 0000-0002-0121-9261 and Fischer, Sebastian (2016). A low-luminosity type-1 QSO sample V. Overluminous host spheroids and their excitation mechanisms. Astron. Astrophys., 587. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We present near-infrared (NIR) H + K-band long-slit spectra of eleven galaxies that were obtained with SOFI at the NTT (ESO). The galaxies are chosen from the low-luminosity type-1 quasi-stellar object (LLQSO) sample, which comprises the 99 closest (z <= 0.06) QSOs from the Hamburg/ESO survey for bright UV-excess QSOs. These objects are ideal targets to study the gap between local Seyfert galaxies and high-redshift quasars because they show much stronger AGN activity than local objects, but are still close enough for a detailed structural analysis. We fit hydrogen recombination, molecular hydrogen, and [Fe II] lines after carefully subtracting the continuum emission. From the broad Paa components, we estimated black hole masses and enlarged the sample of LLQSOs that deviate from the M-BH-L-buige relations of inactive galaxies from 12 to 16 objects. All objects show emission from hot dust (T similar to 1200 K) as well as stellar contribution. However, the respective fractions vary strongly among the objects. More than half of the objects show H-2 emission lines, which indicate a large reservoir of molecular gas that is needed to feed the AGN and star formation. In the NIR diagnostic diagram all objects lie in the location of AGN-dominated objects. However, most of the objects show indications of star formation activity, suggesting that their offset location with respect to M-BH-L-buige relations of inactive galaxies may be a consequence of overluminous bulges.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Busch, Gerold UNSPECIFIED orcid.org/0000-0001-6679-5481 UNSPECIFIED Fazeli, Nastaran UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, Andreas UNSPECIFIED orcid.org/0000-0001-6049-3132 UNSPECIFIED Valencia-S, Monica UNSPECIFIED UNSPECIFIED UNSPECIFIED Smajic, Semir UNSPECIFIED UNSPECIFIED UNSPECIFIED Moser, Lydia UNSPECIFIED UNSPECIFIED UNSPECIFIED Scharwaechter, Julia UNSPECIFIED UNSPECIFIED UNSPECIFIED Dierkes, Jens UNSPECIFIED orcid.org/0000-0002-0121-9261 UNSPECIFIED Fischer, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-282334
DOI:	10.1051/0004-6361/201526753
Journal or Publication Title:	Astron. Astrophys.
Volume:	587
Date:	2016
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics I
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ACTIVE GALACTIC NUCLEI; BLACK-HOLE MASS; INTEGRAL FIELD SPECTROSCOPY; STAR-FORMING GALAXIES; NEAR-INFRARED SPECTROSCOPY; MOLECULAR-HYDROGEN EXCITATION; EMISSION-LINE REGION; FE-II; SEYFERT-GALAXIES; NARROW-LINE Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28233