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Integral field spectroscopy of the circumnuclear region of the radio galaxy Pictor A

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dc.contributor.author Couto, G. S
dc.contributor.author Storchi-Bergmann, T
dc.contributor.author Robinson, A
dc.contributor.author Riffel, R. A
dc.contributor.author Kharb, P
dc.contributor.author Lena, D
dc.contributor.author Schnorr-Muller, A
dc.date.accessioned 2020-11-20T13:35:30Z
dc.date.available 2020-11-20T13:35:30Z
dc.date.issued 2016-06
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 458, No. 1, pp. 855 - 867 en_US
dc.identifier.issn 1365-2966
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7347
dc.description Restricted Access © Royal Astronomical Society http://dx.doi.org/10.1093/mnras/stw399 en_US
dc.description.abstract We present optical integral field spectroscopy of the inner 2.5 × 3.4 kpc2 of the broad-line radio galaxy Pictor A, at a spatial resolution of ≈400 pc. Line emission is observed over the whole field of view, being strongest at the nucleus and in an elongated linear feature (ELF) crossing the nucleus from the south-west to the north-east along PA ≈70◦. Although the broad double-peaked Hα line and the [O I]6300/Hα and [S II]6717+31/Hα ratios are typical of active galactic nuclei (AGNs), the [N II]6584/Hα ratio (0.15–0.25) is unusually low. We suggest that this is due to the unusually low metallicity of the gas. Centroid velocity maps show mostly blueshifts to the south and redshifts to the north of the nucleus, but the velocity field is not well fitted by a rotation model. Velocity dispersions are low (<100 km s−1 ) along the ELF, ruling out a jet–cloud interaction as the origin of this structure. The ELF shows both blueshifts and redshifts in channel maps, suggesting that it is close to the plane of the sky. The ELF is evidently photoionized by the AGN, but its kinematics and inferred low metallicity suggest that this structure may have originated in a past merger event with another galaxy. We suggest that the gas acquired in this interaction may be feeding the ELF. en_US
dc.language.iso en en_US
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en_US
dc.subject galaxies en_US
dc.subject Galaxies: active en_US
dc.subject nuclei en_US
dc.subject Pictor A - galaxies en_US
dc.subject jets – galaxies en_US
dc.title Integral field spectroscopy of the circumnuclear region of the radio galaxy Pictor A en_US
dc.type Article en_US

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