Modelling the [Fe II] λ1.644 μm outflow and comparison with H₂ and H+ kinematics in the inner 200 pc of NGC 1068
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Barbosa, F. K. B.; Storchi-Bergmann, T.; McGregor, P.; Vale, T. B.; Rogemar Riffel, A.
Description
We map the kinematics of the inner (200 pc) narrow-line region (NLR) of the Seyfert 2 galaxy NGC 1068 using the instrument Near-infrared Integral Field Spectrograph and adaptive optics at the Gemini North telescope. Channel maps and position–velocity diagrams are presented at a spatial resolution of ≅8 pc and spectral resolution ∼5300 in the emission lines [Fe II] λ1.644 μm, H₂ λ2.122 μm and Brγ. The [Fe II] emission line provides a better coverage of the NLR outflow than the previously used...[Show more]
dc.contributor.author | Barbosa, F. K. B. | |
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dc.contributor.author | Storchi-Bergmann, T. | |
dc.contributor.author | McGregor, P. | |
dc.contributor.author | Vale, T. B. | |
dc.contributor.author | Rogemar Riffel, A. | |
dc.date.accessioned | 2015-05-08T02:00:52Z | |
dc.date.available | 2015-05-08T02:00:52Z | |
dc.identifier.issn | 0035-8711 | |
dc.identifier.uri | http://hdl.handle.net/1885/13416 | |
dc.description.abstract | We map the kinematics of the inner (200 pc) narrow-line region (NLR) of the Seyfert 2 galaxy NGC 1068 using the instrument Near-infrared Integral Field Spectrograph and adaptive optics at the Gemini North telescope. Channel maps and position–velocity diagrams are presented at a spatial resolution of ≅8 pc and spectral resolution ∼5300 in the emission lines [Fe II] λ1.644 μm, H₂ λ2.122 μm and Brγ. The [Fe II] emission line provides a better coverage of the NLR outflow than the previously used [O III] λ5007 emission line, extending beyond the area of the bipolar cone observed in Brγ and [O III]. This is mainly due to the contribution of the redshifted channels to the north-east of the nucleus, supporting its origin in a partial ionized zone with additional contribution from shocks of the outflowing gas with the galactic disc. We modelled the kinematics and geometry of the [Fe II] emitting gas finding good agreement with the data for outflow models with conical and lemniscate (or hourglass) geometry. We calculate a mass outflow rate of 1.9⁺²ˍ₁ M⊙ yr⁻¹ but a power for the outflow of only 0.08 per cent LBol. The molecular (H₂) gas kinematics is completely distinct from that of [Fe II] and Brγ, showing radial expansion in an off-centred ∼100 pc radius ring in the galaxy plane. The expansion velocity decelerates from ≈200 km s−1 in the inner border of the ring to approximately zero at the outer border where our previous studies found a 10 Myr stellar population. | |
dc.publisher | Oxford University Press | |
dc.rights | http://www.sherpa.ac.uk/romeo/issn/0035-8711/..."Author's Post-print and Publisher's version/PDF on Institutional repositories or Central repositories, Set phrase to accompany archived copy (see policy)" from SHERPA/RoMEO site (as at 8/05/15) This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | |
dc.source | Monthly Notices of the Royal Astronomical Society | |
dc.subject | ISM: jets and outflows | |
dc.subject | galaxies: active | |
dc.subject | galaxies: individual: NGC 1068 | |
dc.subject | galaxies: ISM | |
dc.subject | galaxies: kinematics and dynamics | |
dc.subject | galaxies: nuclei | |
dc.title | Modelling the [Fe II] λ1.644 μm outflow and comparison with H₂ and H+ kinematics in the inner 200 pc of NGC 1068 | |
dc.type | Journal article | |
local.identifier.citationvolume | 445 | |
dcterms.dateAccepted | 2014-08-05 | |
dc.date.issued | 2014-10-20 | |
local.identifier.absfor | 020100 - ASTRONOMICAL AND SPACE SCIENCES | |
local.identifier.ariespublication | u4830877xPUB75 | |
local.publisher.url | http://www.oxfordjournals.org/en/ | |
local.type.status | Published Version | |
local.contributor.affiliation | McGregor, P., Research School of Astronomy and Astrophysics, The Australian National University | |
local.identifier.essn | 1365-2966 | |
local.bibliographicCitation.issue | 3 | |
local.bibliographicCitation.startpage | 2353 | |
local.bibliographicCitation.lastpage | 2370 | |
local.identifier.doi | 10.1093/mnras/stu1637 | |
local.identifier.absseo | 970102 - Expanding Knowledge in the Physical Sciences | |
dc.date.updated | 2015-12-08T07:59:29Z | |
local.identifier.scopusID | 2-s2.0-84924599132 | |
local.identifier.thomsonID | 000346962900017 | |
Collections | ANU Research Publications |
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