An Embedded Active Nucleus in the OH Megamaser Galaxy IRAS16399−0937
Dinalva A. Sales,Dinalva A. Sales,Andrew Robinson,David J. Axon,David J. Axon,Jack F. Gallimore,Preeti Kharb,R. L. Curran,Christopher P. O'Dea,Stefi A. Baum,Moshe Elitzur,Rupal Mittal +11 more
TL;DR: In this paper, a multi-wavelength study of the OH megamaser galaxy IRAS16399?0937 is presented, based on new Hubble Space Telescope (HST)/Advanced Camera for Surveys F814W and H+[N?II] images and archive data from HST, Two Micron All Sky Survey, Spitzer, Herschel and the Very Large Array.
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Abstract: We present a multiwavelength study of the OH megamaser galaxy IRAS16399?0937, based on new Hubble Space Telescope (HST)/Advanced Camera for Surveys F814W and H?+[N?II] images and archive data from HST, Two Micron All Sky Survey, Spitzer, Herschel and the Very Large Array. This system has a double nucleus, whose northern (IRAS16399N) and southern (IRAS16399S) components have a projected separation of ~6''?(3.4 kpc) and have previously been identified based on optical spectra as a low ionization nuclear emission line region (LINER) and starburst nucleus, respectively. The nuclei are embedded in a tidally distorted common envelope, in which star formation is mostly heavily obscured. The infrared spectrum is dominated by strong polycyclic aromatic hydrocarbon, but deep silicate and molecular absorption features are also present, and are strongest in the IRAS16399N nucleus. The 0.435-500??m?spectral energy distribution was fitted with a model including stellar, interstellar medium and active galactic nucleus (AGN) torus components using our new Markov Chain Monte Carlo code, CLUMPYDREAM. The results indicate that the IRAS16399N contains an AGN (L bol ~ 1044?erg?s?1) deeply embedded in a quasi-spherical distribution of optically thick clumps with a covering fraction 1. We suggest that these clumps are the source of the OHM emission in IRAS16399?0937. The high torus covering fraction precludes AGN photoionization as the origin of the LINER spectrum, however, the spectrum is consistent with shocks (v ~ 100-200 km s?1). We infer that the ~108 M ? black hole in IRAS16399N is accreting at a small fraction (~1%) of its Eddington rate. The low accretion rate and modest nuclear star formation rates suggest that while the gas-rich major merger forming the IRAS16399?0937 system has triggered widespread star formation, the massive gas inflows expected from merger simulations have not yet fully developed.
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On the Gas Content and Efficiency of AGN Feedback in Low-redshift Quasars
TL;DR: In this paper, a Bayesian Markov Chain Monte Carlo fitting method was used to decompose various overlapping contributions to the integrated spectral energy distribution, including starlight, warm dust from the torus, and cooler dust on galaxy scales.
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On the Gas Content and Efficiency of AGN Feedback in Low-redshift Quasars
TL;DR: In this paper, a Bayesian Markov Chain Monte Carlo fitting method was used to decompose various overlapping contributions to the integrated spectral energy distribution, including starlight, warm dust from the torus, and cooler dust on galaxy scales.
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The effects of stellar activity on optical high-resolution exoplanet transmission spectra
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C-GOALS II. Chandra Observations of the Lower Luminosity Sample of Nearby Luminous Infrared Galaxies in GOALS
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