Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/148929 |
Resumo: | 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 [OI]6300/Hα and [S II]6717+31/Hα ratios are typical of active galactic nuclei (AGNs), the [NII]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. |
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Couto, Guilherme dos SantosStorchi-Bergmann, ThaisaRobinson, AndrewRiffel, Rogemar AndréKharb, PreetiLena, DavideMüller, Allan Schnorr2016-10-08T02:15:18Z20160035-8711http://hdl.handle.net/10183/148929000999770We 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 [OI]6300/Hα and [S II]6717+31/Hα ratios are typical of active galactic nuclei (AGNs), the [NII]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.application/pdfengMonthly notices of the Royal Astronomical Society. Oxford. Vol. 458, no. 1 (May 2016), p. 855–867Galáxias ativasNucleo galaticoGaláxia Pictor AGalaxies: activeGalaxies: individual: Pictor AGalaxies: jetsGalaxies: nucleiIntegral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor AEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSORIGINAL000999770.pdf000999770.pdfTexto completo (inglês)application/pdf3321161http://www.lume.ufrgs.br/bitstream/10183/148929/1/000999770.pdfeb156e3b2f0490fe93b90ac06a70ae53MD51TEXT000999770.pdf.txt000999770.pdf.txtExtracted Texttext/plain57086http://www.lume.ufrgs.br/bitstream/10183/148929/2/000999770.pdf.txtc8eb3224706dd0897e0f00937c22799aMD52THUMBNAIL000999770.pdf.jpg000999770.pdf.jpgGenerated Thumbnailimage/jpeg2167http://www.lume.ufrgs.br/bitstream/10183/148929/3/000999770.pdf.jpg376a8ed92a6158f30ed57a0d8812938bMD5310183/1489292023-06-21 03:31:49.336105oai:www.lume.ufrgs.br:10183/148929Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-06-21T06:31:49Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A |
title |
Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A |
spellingShingle |
Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A Couto, Guilherme dos Santos Galáxias ativas Nucleo galatico Galáxia Pictor A Galaxies: active Galaxies: individual: Pictor A Galaxies: jets Galaxies: nuclei |
title_short |
Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A |
title_full |
Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A |
title_fullStr |
Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A |
title_full_unstemmed |
Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A |
title_sort |
Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A |
author |
Couto, Guilherme dos Santos |
author_facet |
Couto, Guilherme dos Santos Storchi-Bergmann, Thaisa Robinson, Andrew Riffel, Rogemar André Kharb, Preeti Lena, Davide Müller, Allan Schnorr |
author_role |
author |
author2 |
Storchi-Bergmann, Thaisa Robinson, Andrew Riffel, Rogemar André Kharb, Preeti Lena, Davide Müller, Allan Schnorr |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Couto, Guilherme dos Santos Storchi-Bergmann, Thaisa Robinson, Andrew Riffel, Rogemar André Kharb, Preeti Lena, Davide Müller, Allan Schnorr |
dc.subject.por.fl_str_mv |
Galáxias ativas Nucleo galatico Galáxia Pictor A |
topic |
Galáxias ativas Nucleo galatico Galáxia Pictor A Galaxies: active Galaxies: individual: Pictor A Galaxies: jets Galaxies: nuclei |
dc.subject.eng.fl_str_mv |
Galaxies: active Galaxies: individual: Pictor A Galaxies: jets Galaxies: nuclei |
description |
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 [OI]6300/Hα and [S II]6717+31/Hα ratios are typical of active galactic nuclei (AGNs), the [NII]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. |
publishDate |
2016 |
dc.date.accessioned.fl_str_mv |
2016-10-08T02:15:18Z |
dc.date.issued.fl_str_mv |
2016 |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/148929 |
dc.identifier.issn.pt_BR.fl_str_mv |
0035-8711 |
dc.identifier.nrb.pt_BR.fl_str_mv |
000999770 |
identifier_str_mv |
0035-8711 000999770 |
url |
http://hdl.handle.net/10183/148929 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Monthly notices of the Royal Astronomical Society. Oxford. Vol. 458, no. 1 (May 2016), p. 855–867 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
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application/pdf |
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