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The molecular gas p...
The molecular gas properties in local Seyfert 2 galaxies
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- Salvestrini, F. (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Gruppioni, C. (author)
- Istituto nazionale di astrofisica (INAF),Universita di Bologna,University of Bologna
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- Hatziminaoglou, E. (author)
- European Southern Observatory (ESO)
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- Pozzi, F. (author)
- Universita di Bologna,University of Bologna,Istituto nazionale di astrofisica (INAF)
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- Vignali, Cristian (author)
- Universita di Bologna,University of Bologna,Istituto nazionale di astrofisica (INAF)
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- Casasola, V. (author)
- Istituto di Radioastronomia
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- Paladino, R. (author)
- Istituto nazionale di astrofisica (INAF),Istituto di Radioastronomia
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- Aalto, Susanne, 1964 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Andreani, P. (author)
- European Southern Observatory (ESO)
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- Marchesi, S. (author)
- Clemson University,Universita di Bologna,University of Bologna
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- Stanke, T. (author)
- European Southern Observatory (ESO)
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(creator_code:org_t)
- 2022-07-08
- 2022
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 663, s. 1DUMM-
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Abstract
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- Aims. We present a multiwavelength study of the molecular gas properties of a sample of local Seyfert 2 galaxies to assess if, and to what extent, the presence of an active galactic nucleus (AGN) can affect the interstellar medium (ISM) properties in a sample of 33 local Seyfert 2 galaxies. Methods. We compare the molecular gas content (MH2) derived from new and archival low-J CO line measurements of a sample of AGN and a control sample of star-forming galaxies (SFGs). Both the AGN and the control sample are characterized in terms of host-galaxy properties, for example stellar and dust masses (M* and Mdust, respectively) and the star formation rate (SFR). We also investigate the effect of AGN activity on the emission of polycyclic aromatic hydrocarbon (PAH) molecules in the mid-infrared (MIR), a waveband where the dust-reprocessed emission from the obscured AGN contributes the most. Result. The AGN hosted in less massive galaxies (i.e., M* < 1010.5 M⊙; Mdust < 107.5 M⊙) show larger molecular gas contents with respect to SFGs that have the same stellar and dust masses. When comparing their depletion times (tdep ≈ MH2/SFR), AGN show tdep ∼ 0.3-1.0 Gyr, similar to the times observed in the control sample of SFGs. Seyfert 2 galaxies show fainter PAH luminosity the larger the dominance of the nuclear activity in the MIR. Conclusions. We find no clear evidence for a systematic reduction in the molecular gas reservoir at galactic scales in Seyfert galaxies with respect to SFGs. This is in agreement with recent studies that show that molecular gas content is only reduced in sub-kiloparsec-sized regions, where emission from the accreting supermassive black hole dominates. Nonetheless, we show that the impact of AGN activity on the ISM is clearly visible as a suppression of the PAH luminosity.
Subject headings
- NATURVETENSKAP -- Kemi -- Analytisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Analytical Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
Keyword
- Galaxies: Seyfert
- Galaxies: ISM
- Galaxies: Nuclei
Publication and Content Type
- art (subject category)
- ref (subject category)
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Salvestrini, F.
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Gruppioni, C.
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Hatziminaoglou, ...
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Pozzi, F.
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Vignali, Cristia ...
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Casasola, V.
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Paladino, R.
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Aalto, Susanne, ...
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Andreani, P.
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Marchesi, S.
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Stanke, T.
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Analytical Chemi ...
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Other Chemistry ...
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Chalmers University of Technology