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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28440

Title: Blasts and shocks in the disc of NGC 4258
Authors: Jiménez Vicente, Jorge
Mediavilla, E.
Castillo-Morales, A.
Battaner, E.
Issue Date: 2010
Abstract: We present integral field spectroscopic observations of the central region of the active galaxy NGC 4258 obtained with the fibre IFU system INTEGRAL. We have been able to detect cold neutral gas by means of the interstellar NaD doublet absorption and to trace its distribution and kinematics with respect to the underlying disc. The neutral gas is blueshifted with projected velocities in the 120–370 km s−1 range. We have also detected peculiar kinematics in part of the ionized gas in this region by means of a careful kinematic decomposition. The bipolar spatial distribution of the broader component is roughly coincident with the morphology of the X-ray diffuse emission. The kinematics of this gas can be explained in terms of expansion at very high (projected) velocities of up to 300 km s−1. The observations also reveal the existence of a strip of neutral gas, parallel to the major kinematic axis, that is nearly coincident with a region of very high [S II]/Hα ratio tracing the shocked gas. Our observations are consistent with the jet model presented by Wilson, Yang & Cecil in which a cocoon originating from the nuclear jet is shocking the gas in the galaxy disc. Alternatively, our observations are also consistent with the bipolar hypershell model of Sofue and Sofue & Vogler. On balance, we prefer the latter model as the most likely explanation for the puzzling features of this peculiar object.
Sponsorship: This paper has been supported by the ‘Secretaría de Estado de Política Científica y Tecnológica’ (AYA2007-67625-C02-02) and by the ‘Consejería de Ciencia y Tecnología de la Junta de Andalucía’ (FQM-108, P05-FQM-792). AC-M acknowledges support from the Juan de la Cierva Programme financed by the Spanish MICINN and from the Spanish Programa Nacional de Astronomía y Astrofísica under grant AYA2006-02358.
Publisher: Oxford University Press (OUP); Royal Astronomical Society
Keywords: Galaxies
NGC 4258
ISM
Jets
Outflows
URI: http://hdl.handle.net/10481/28440
ISSN: 0035-8711
1365-2966
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Jiménez Vicente, J.; et al. Blasts and shocks in the disc of NGC 4258. Monthly Notices of the Royal Astronomical Society, 406(1): 181-186 (2010). [http://hdl.handle.net/10481/28440]
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