Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Herschel-SPIRE spectroscopy of nearby Seyfert galaxies

Sacchi, N., Spinoglio, L., Wilson, C. D., Kamenetzky, J., Rangwala, N., Rykala, A., Isaak, K. G., Bendo, G. J., Bradford, M., Glenn, J., Maloney, P. R., Schirm, M. R. P., Auld, Robbie, Baes, M., Barlow, M. J., Bock, J. J., Boselli, A., Buat, V., Castro-Rodriguez, N., Chanial, P., Charlot, S., Ciesla, L., Clements, D. L., Cooray, A., Cormier, D., Cortese, L., Davies, J. I., Dwek, E., Eales, Stephen Anthony ORCID:, Elbaz, D., Galametz, M., Galliano, F., Gear, Walter Kieran ORCID:, Gomez, Haley Louise ORCID:, Griffin, Matthew Joseph ORCID:, Hony, S., Levenson, L. R., Lu, N., Madden, S., O'Halloran, B., Okumura, K., Oliver, S., Page, M. J., Panuzzo, P., Papageorgiou, Andreas, Parkin, T. J., Perez-Fournon, I., Pohlen, M., Rigby, E. E., Roussel, H., Sauvage, M., Schulz, B., Smith, M. W. L., Stevens, J. A., Sundar, S., Symeonidis, M., Trichas, M., Vaccari, M., Vigroux, L., Wozniak, H., Wright, G. S. and Zeilinger, W. W. 2011. Herschel-SPIRE spectroscopy of nearby Seyfert galaxies. Presented at: 280th Symposium of the International Astronomical Union (IAU), Toledo, Spain, 30 May - 3 June 2011. The Molecular Universe, Posters from the Proceedings of the 280th Symposium of the International Astronomical Union held in Toledo, Spain, May 30-June 3, 2011. NASA, p. 322.

Full text not available from this repository.


We present the 450-1550 GHz spectra of three nearby Seyfert galaxies (NGC1068, NGC7130 and NGC7582) taken with the Herschel SPIRE FTS. For the case of NGC1068 we reconstruct the nuclear spectral line energy distribution (SLED) of the CO lines, applying nonLTE radiative transfer and a Bayesian likelihood analysis to estimate the physical properties of the molecular gas in the circumnuclear region. Groundbased observations of the low-J transitions with high (few arcsec) angular resolution are required to reconstruct the nuclear SLED avoiding contamination from colder molecular gas on larger galactic scales. We find evidence for a very warm molecular gas component with a density ~10^3.9 cm-3, similar to that found in previous works (Papadopoulos & Seaquist 1999, Usero et al. 2004, Kamenetzky et al. 2011), but with a much higher temperature (~ 550 K instead of 20-160 K). The higher-J transitions of CO are compatible with being excited in X-ray dissociation regions (XDR). However, in order to explain the entire CO SLED a comparable contribution from photodissociation regions (PDR) is required.

Item Type: Conference or Workshop Item (Poster)
Book Type: Authored Book
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Additional Information: IAU Symposium 280, Poster 87, Session 2.
Publisher: NASA
Related URLs:
Last Modified: 03 Dec 2022 11:58

Citation Data

Actions (repository staff only)

Edit Item Edit Item