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Title

A deep look at the nuclear region of UGC 5101 through high angular resolution mid-IR data with GTC/CanariCam

AuthorsMartínez-Paredes, M.; Alonso-Herrero, A. ; Aretxaga, I.; Ramos-Almeida, Cristina; Hernán-Caballero, Antonio ; González-Martín, Omaira ; Pereira-Santaella, Miguel ; Packham, Christopher; Asensio Ramos, A.; Díaz-Santos, T. ; Elitzur, M.; Esquej, Pilar ; Levenson, N.; Rodríguez-Espinosa, J. M.
KeywordsGalaxies: active
Galaxies: Seyfert
UGC 5101
Galaxies: individual
Infrared: galaxies
Issue Date2015
PublisherOxford University Press
CitationMonthly Notices of the Royal Astronomical Society 454(4): 3577-3589 (2015)
AbstractWe present an analysis of the nuclear infrared (IR, 1.6-18 μm) emission of the ultraluminous IR galaxy UGC5101 to derive the properties of its active galactic nucleus (AGN) and its obscuring material. We use new mid-IR high angular resolution (0.3-0.5 arcsec) imaging using the Si-2 filter (λ = 8.7 μm) and 7.5-13 μm spectroscopy taken with CanariCam (CC) on the 10.4 m Gran Telescopio CANARIAS. We also use archival Hubble Space Telescope/NICMOS and Subaru/COMICS imaging and Spitzer/IRS spectroscopy. We estimate the near- and mid-IR unresolved nuclear emission by modelling the imaging data with GALFIT. We decompose the Spitzer/IRS and CC spectra using a power-law component, which represents the emission due to dust heated by the AGN, and a starburst component, both affected by foreground extinction. We model the resulting unresolved near- and mid-IR, and the starburst subtracted CC spectrum with the CLUMPY torus models of Nenkova et al. The derived geometrical properties of the torus, including the large covering factor and the high foreground extinction needed to reproduce the deep 9.7 μm silicate feature, are consistent with the lack of strong AGN signatures in the optical.We derive an AGN bolometric luminosity L ~ 1.9 × 10 erg s that is in good agreement with other estimates in the literature.
Descriptionet al.
Publisher version (URL)https://doi.org/10.1093/mnras/stv2134
URIhttp://hdl.handle.net/10261/139868
DOI10.1093/mnras/stv2134
Identifiersdoi: 10.1093/mnras/stv2134
e-issn: 1365-2966
issn: 0035-8711
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