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A low-luminosity type-1 QSO sample. IV. Molecular gas contents and conditions of star formation in three nearby Seyfert galaxies

Moser, Lydia (author)
Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,Universität zu Köln,University of Cologne
Krips, Melanie (author)
Domaine universitaire de Grenoble
Busch, Gerold (author)
Universität zu Köln,University of Cologne
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Scharwächter, Julia (author)
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
König, Sabine, 1983 (author)
Domaine universitaire de Grenoble
Eckart, Andreas (author)
Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,Universität zu Köln,University of Cologne
Smajic, Semir (author)
Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,Universität zu Köln,University of Cologne
Garcia-Marin, Macarena (author)
Universität zu Köln,University of Cologne
Valencia-S., Monica (author)
Universität zu Köln,University of Cologne
Fischer, Sebastian (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Dierkes, Jens (author)
Georg-August-Universität Göttingen,University of Göttingen
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 (creator_code:org_t)
2016-03-03
2016
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 587, s. A137-
  • Journal article (peer-reviewed)
Abstract Subject headings
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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.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

galaxies: kinematics and dynamics
radio lines: galaxies
galaxies: ISM
submillimeter: galaxies
galaxies: Seyfert
galaxies: active

Publication and Content Type

art (subject category)
ref (subject category)

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