Sub-arcsec mid-IR observations of NGC 1614: Nuclear star formation or an intrinsically X-ray weak AGN?

We present new mid-infrared (mid-IR) N-band spectroscopy and Q-band photometry of the local luminous IR galaxy NGC 1614, one of the most extreme nearby starbursts. We analyse the mid-IR properties of the nucleus (central 150 pc) and four regions of the bright circumnuclear (diameter∼600 pc) star-for...

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Published in:Monthly notices of the Royal Astronomical Society 2015-12, Vol.454 (4), p.3679-3687
Main Authors: Pereira-Santaella, M., Colina, L., Alonso-Herrero, A., Usero, A., Díaz-Santos, T., García-Burillo, S., Alberdi, A., Gonzalez-Martin, O., Herrero-Illana, R., Imanishi, M., Levenson, N. A., Pérez-Torres, M. A., Ramos Almeida, C.
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astronomy
Emission
Luminosity
Nuclei
Photometry
Polyallylamine hydrochloride
Polycyclic aromatic hydrocarbons
Radiation
Star & galaxy formation
Star formation
Starbursts
X rays
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Summary:We present new mid-infrared (mid-IR) N-band spectroscopy and Q-band photometry of the local luminous IR galaxy NGC 1614, one of the most extreme nearby starbursts. We analyse the mid-IR properties of the nucleus (central 150 pc) and four regions of the bright circumnuclear (diameter∼600 pc) star-forming (SF) ring of this object. The nucleus differs from the circumnuclear SF ring by having a strong 8–12 μm continuum (low 11.3 μm PAH equivalent width). These characteristics, together with the nuclear X-ray and sub-mm properties, can be explained by an X-ray weak active galactic nucleus (AGN), or by peculiar SF with a short molecular gas depletion time and producing an enhanced radiation field density. In either case, the nuclear luminosity (L IR 
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stv2242