Universität zu Köln

Moser, Lydia, Krips, Melanie, Busch, Gerold ORCID: 0000-0001-6679-5481, Scharwaechter, Julia, Koenig, Sabine, Eckart, Andreas, Smajic, Semir, Garcia-Marin, Macarena, Valencia-S, Monica, Fischer, Sebastian and Dierkes, Jens ORCID: 0000-0002-0121-9261 (2016). A low-luminosity type-1 QSO sample IV. Molecular gas contents and conditions of star formation in three nearby Seyfert galaxies. Astron. Astrophys., 587. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

We present a pilot study of similar to 3 '' resolution observations of low CO transitions with the Submillimeter Array in three nearby Seyfert galaxies, which are part of the low-luminosity quasi-stellar object (LLEQSOs) sample consisting of 99 nearby (z = 0.06) type-1 active galactic nuclei (AGN) taken from the Hamburg/ESO quasi-stellar object (QSO) survey. Two sources were observed in (CO)-C-12(2-1) and (CO)-C-13(2-1) and the third in (CO)-C-12(3-2) and HCO+ (4-3). None of the sources is detected in continuum emission. More than 80% of the (CO)-C-12 detected molecular gas is concentrated within a diameter (FWHM) < 1.8 kpc. (CO)-C-13 is tentatively detected, while HCO+ emission could not be detected. All three objects show indications of a kinematically decoupled central unresolved molecular gas component. The molecular gas masses of the three galaxies are in the range M-mol = (0.7-8.7) x 10(9) M-circle dot. We give lower limits for the dynamical masses of M-dyn > 1.5 x 10(9) M-circle dot, and for the dust masses of M-dust > 1.6 x 10(6) M-circle dot. The R-21 = (CO)-C-12/(CO)-C-13(2-1) line luminosity ratios show Galactic values of R-21 similar to 5-7 in the outskirts and R-21 greater than or similar to 20 in the central region, similar to starbursts and (ultra)luminous infrared galaxies ((U)LIRGs; i.e. LIRGs and ULIRGs), implying higher temperatures and stronger turbulence. All three sources show indications of (CO)-C-12(2-1)/(CO)-C-12(1-0) ratios of similar to 0.5, suggesting a cold or diffuse gas phase. Strikingly, the (CO)-C-12(3-2)/(1-0) ratio of similar to 1 also indicates a higher excited phase. Since these galaxies have high infrared luminosities of L-IR >= 10(11) L-circle dot and seem to contain a circumnuclear starburst with minimum surface densities of gas and star formation rate (SFR) around Sigma(mol) = 50-550 M-circle dot pc(-2) and Sigma(SFR) = 1.1-3.1 M-circle dot kpc(-2) yr(-1), we conclude that the interstellar medium in the centers of these LIRG Seyferts is strongly affected by violent star formation and better described by the ULIRG mass conversion factor.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Moser, Lydia UNSPECIFIED UNSPECIFIED UNSPECIFIED Krips, Melanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Busch, Gerold UNSPECIFIED orcid.org/0000-0001-6679-5481 UNSPECIFIED Scharwaechter, Julia UNSPECIFIED UNSPECIFIED UNSPECIFIED Koenig, Sabine UNSPECIFIED UNSPECIFIED UNSPECIFIED Eckart, Andreas UNSPECIFIED UNSPECIFIED UNSPECIFIED Smajic, Semir UNSPECIFIED UNSPECIFIED UNSPECIFIED Garcia-Marin, Macarena UNSPECIFIED UNSPECIFIED UNSPECIFIED Valencia-S, Monica UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Sebastian UNSPECIFIED UNSPECIFIED UNSPECIFIED Dierkes, Jens UNSPECIFIED orcid.org/0000-0002-0121-9261 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-282349
DOI:	10.1051/0004-6361/201526358
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 SUPERMASSIVE BLACK-HOLES; SPATIALLY-RESOLVED CHEMISTRY; NARROW-LINE REGION; AGN-DRIVEN OUTFLOW; HOST GALAXIES; CO EMISSION; INFRARED GALAXIES; OPTICAL CLASSIFICATION; INTERSTELLAR-MEDIUM; CENTRAL KILOPARSEC Multiple languages Astronomy & Astrophysics Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28234