Bibcode
Martínez-Paredes, M.; Alonso-Herrero, A.; Aretxaga, I.; Ramos Almeida, C.; Hernán-Caballero, A.; González-Martín, O.; Pereira-Santaella, M.; Packham, C.; Asensio Ramos, A.; Díaz-Santos, T.; Elitzur, M.; Esquej, P.; García-Bernete, I.; Imanishi, M.; Levenson, N. A.; Rodríguez Espinosa, J. M.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 454, Issue 4, p.3577-3589
Advertised on:
12
2015
Citations
15
Refereed citations
15
Description
We present an analysis of the nuclear infrared (IR, 1.6-18 μm)
emission of the ultraluminous IR galaxy UGC 5101 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 (λC = 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 Lbol ˜ 1.9 ×
1045 erg s-1 that is in good agreement with other
estimates in the literature.
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