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A low-luminosity ty...
A low-luminosity type-1 QSO sample. IV. Molecular gas contents and conditions of star formation in three nearby Seyfert galaxies
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- Moser, Lydia (författare)
- Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,Universität zu Köln,University of Cologne
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- Krips, Melanie (författare)
- Domaine universitaire de Grenoble
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- Busch, Gerold (författare)
- Universität zu Köln,University of Cologne
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- Scharwächter, Julia (författare)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- König, Sabine, 1983 (författare)
- Domaine universitaire de Grenoble
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- Eckart, Andreas (författare)
- Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,Universität zu Köln,University of Cologne
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- Smajic, Semir (författare)
- Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,Universität zu Köln,University of Cologne
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- Garcia-Marin, Macarena (författare)
- Universität zu Köln,University of Cologne
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- Valencia-S., Monica (författare)
- Universität zu Köln,University of Cologne
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- Fischer, Sebastian (författare)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
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- Dierkes, Jens (författare)
- Georg-August-Universität Göttingen,University of Göttingen
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(creator_code:org_t)
- 2016-03-03
- 2016
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 587, s. A137-
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Abstract
Ämnesord
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- We present a pilot study of ~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 (LLQSOs) 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 12CO(2-1) and 13CO(2-1) and the third in 12CO(3-2) and HCO+(4-3). None of the sources is detected in continuum emission. More than 80% of the 12CO detected molecular gas is concentrated within a diameter (FWHM) 1.5 × 109M⊙ and for the dust masses of Mdust> 1.6 × 106M⊙. The R21 = 12CO/13CO(2-1) line luminosity ratios show Galactic values of R21 ~ 5-7 in the outskirts and R21 ≳ 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 12CO(2-1)/12CO(1-0) ratios of ~0.5, suggesting a cold or diffuse gas phase. Strikingly, the 12CO(3-2)/(1-0) ratio of ~1 also indicates a higher excited phase. Since these galaxies have high infrared luminosities of LIR ≥ 1011L⊙ and seem to contain a circumnuclear starburst with minimum surface densities of gas and star formation rate (SFR) around Σmol = 50-550 M⊙pc-2 and ΣSFR = 1.1-3.1 M⊙ 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- galaxies: kinematics and dynamics
- radio lines: galaxies
- galaxies: ISM
- submillimeter: galaxies
- galaxies: Seyfert
- galaxies: active
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- Av författaren/redakt...
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Moser, Lydia
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Krips, Melanie
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Busch, Gerold
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Scharwächter, Ju ...
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König, Sabine, 1 ...
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Eckart, Andreas
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Smajic, Semir
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Garcia-Marin, Ma ...
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Valencia-S., Mon ...
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Fischer, Sebasti ...
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Dierkes, Jens
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