Infrared Spectroscopy of NGC 1068: Probing the Obscured Ionizing AGN Continuum | Zendy

Tal Alexander | Zendy; D. Lutz | Zendy; E. Sturm | Zendy; R. Genzel | Zendy; A. Sternberg | Zendy; H. Netzer | Zendy

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Infrared Spectroscopy of NGC 1068: Probing the Obscured Ionizing AGN Continuum

Author(s) -

Tal Alexander,

D. Lutz,

E. Sturm,

R. Genzel,

A. Sternberg,

H. Netzer

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/308973

Subject(s) - physics , astrophysics , active galactic nucleus , galaxy , spectral energy distribution , infrared , outflow , line (geometry) , luminous infrared galaxy , spectroscopy , hydrogen line , spectral line , emission spectrum , astronomy , geometry , mathematics , meteorology

The ISO-SWS 2.5-45 um infrared spectroscopic observations of the nucleus ofthe Seyfert 2 galaxy NGC 1068 (see companion paper) are combined with acompilation of UV to IR narrow emission line data to determine the spectralenergy distribution (SED) of the obscured extreme-UV continuum thatphotoionizes the narrow line emitting gas in the active galactic nucleus. Wesearch a large grid of gas cloud models and SEDs for the combination that bestreproduces the observed line fluxes and NLR geometry. Our best fit modelreproduces the observed line fluxes to better than a factor of 2 on average andis in general agreement with the observed NLR geometry. It has two gascomponents that are consistent with a clumpy distribution of dense outflowinggas in the center and a more extended distribution of less dense and moreclumpy gas farther out that has no net outflow. The best fit SED has a deeptrough at ~4 Ryd, which is consistent with an intrinsic Big Blue Bump that ispartially absorbed by ~6x10^19 cm^-2 of neutral hydrogen interior to the NLR.Comment: 15 pp, 4 figures, ApJ accepte

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