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CO excitation in the Seyfert galaxy NGC 7130

Pozzi, F. and Vallini, L. and Vignali, C. and Talia, M. and Gruppioni, C. and Mingozzi, M. and Massardi, M. and Andreani, P. (2017) CO excitation in the Seyfert galaxy NGC 7130. Monthly Notices of the Royal Astronomical Society: Letters, 470 (1). L64-L68. ISSN 1745-3925. doi:10.1093/mnrasl/slx077.

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We present a coherent multiband modelling of the carbon monoxide (CO) spectral energy distribution of the local Seyfert galaxy NGC 7130 to assess the impact of the active galactic nucleus (AGN) activity on the molecular gas. We take advantage of all the available data from X-ray to the submillimetre, including ALMA data. The high-resolution (∼0.2 arcsec) ALMA CO(6–5) data constrain the spatial extension of the CO emission down to an ∼70 pc scale. From the analysis of the archival Chandra and NuSTAR data, we infer the presence of a buried, Compton-thick AGN of moderate luminosity, L_(2–10 keV)  ∼ 1.6 × 10^(43) erg s^(−1). We explore photodissociation and X-ray-dominated-region (PDR and XDR) models to reproduce the CO emission. We find that PDRs can reproduce the CO lines up to J ∼ 6; however, the higher rotational ladder requires the presence of a separate source of excitation. We consider X-ray heating by the AGNs as a source of excitation, and find that it can reproduce the observed CO spectral energy distribution. By adopting a composite PDR+XDR model, we derive molecular cloud properties. Our study clearly indicates the capabilities offered by the current generation of instruments to shed light on the properties of nearby galaxies by adopting state-of-the-art physical modelling.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Vallini, L.0000-0002-3258-3672
Vignali, C.0000-0002-8853-9611
Talia, M.0000-0003-4352-2063
Gruppioni, C.0000-0002-5836-4056
Alternate Title:CO excitation in the Seyfert galaxy NGC7130
Additional Information:© 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2017 May 11. Received 2017 May 9; in original form 2017 February 21. Published: 23 May 2017. We acknowledge support from the Italian node of the Alma Regional Center. This Letter makes use of the ALMA data ADS/JAO.ALMA#2013.1.00524.S. FP kindly thanks the referees Matthew Malkan and Andrea Cimatti.
Subject Keywords:photodissociation region (PDR) – galaxies: active – galaxies: ISM
Issue or Number:1
Record Number:CaltechAUTHORS:20170524-093951443
Persistent URL:
Official Citation:F. Pozzi, L. Vallini, C. Vignali, M. Talia, C. Gruppioni, M. Mingozzi, M. Massardi, P. Andreani; CO excitation in the Seyfert galaxy NGC 7130, Monthly Notices of the Royal Astronomical Society: Letters, Volume 470, Issue 1, 1 September 2017, Pages L64–L68,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:77702
Deposited By: Joy Painter
Deposited On:24 May 2017 16:48
Last Modified:15 Nov 2021 17:33

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