The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass

Detalhes bibliográficos
Autor(a) principal: Pulsoni, Claudia
Data de Publicação: 2018
Outros Autores: Gerhard, Ortwin, Arnaboldi, Magda, Coccato, Lodovico, Longobardi, Alessia, Napolitano, Nicola R., Moylan, Emily K. M., Narayan, Chaitra A., Gupta, V., Burkert, Andreas, Capaccioli, M., Chies-Santos, Ana Leonor, Cortesi, Arianna, Freeman, Kenneth C., Kuijken, Koenraad H., Merrifield, Michael, Romanowsky, Aaron J., Tortora, Crescenzo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/203860
Resumo: Context. In the hierarchical two-phase formation scenario, the halos of early type galaxies (ETGs) are expected to have different physical properties from the galaxies’ central regions. Aims. The ePN.S survey characterizes the kinematic properties of ETG halos using planetary nebulae (PNe) as tracers, overcoming the limitations of absorption line spectroscopy at low surface brightness. Methods. We present two-dimensional velocity and velocity dispersion fields for 33 ETGs, including fast (FRs) and slow rotators (SRs). The velocity fields were reconstructed from the measured PN velocities using an adaptive kernel procedure validated with simulations, and extend to a median of 5.6 effective radii (Re). We complemented the PN kinematics with absorption line data from the literature, for a complete description of the kinematics from the center to the outskirts. Results. ETGs typically show a kinematic transition between inner regions and halo. Estimated transition radii in units of Re anti-correlate with stellar mass. SRs have increased but still modest rotational support at large radii. Most of the FRs show a decrease in rotation, due to the fading of the inner disk in the outer, more slowly rotating spheroid. 30% of the FRs are dominated by rotation also at large radii. Most ETGs have flat or slightly falling halo velocity dispersion profiles, but 15% of the sample have steeply falling profiles. All of the SRs and 40% of the FRs show signatures of triaxial halos such as kinematic twists or misalignments. We show with illustrative photometric models that this is consistent with the distribution of isophote twists from extended photometry. Conclusions. ETGs have more diverse kinematic properties in their halos than in the central regions. FRs do contain inner disk components but these frequently fade in outer spheroids which are often triaxial. The observed kinematic transition to the halo and its dependence on stellar mass is consistent with ΛCDM simulations and supports a two-phase formation scenario.
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spelling Pulsoni, ClaudiaGerhard, OrtwinArnaboldi, MagdaCoccato, LodovicoLongobardi, AlessiaNapolitano, Nicola R.Moylan, Emily K. M.Narayan, Chaitra A.Gupta, V.Burkert, AndreasCapaccioli, M.Chies-Santos, Ana LeonorCortesi, AriannaFreeman, Kenneth C.Kuijken, Koenraad H.Merrifield, MichaelRomanowsky, Aaron J.Tortora, Crescenzo2019-12-27T04:04:24Z20180004-6361http://hdl.handle.net/10183/203860001107262Context. In the hierarchical two-phase formation scenario, the halos of early type galaxies (ETGs) are expected to have different physical properties from the galaxies’ central regions. Aims. The ePN.S survey characterizes the kinematic properties of ETG halos using planetary nebulae (PNe) as tracers, overcoming the limitations of absorption line spectroscopy at low surface brightness. Methods. We present two-dimensional velocity and velocity dispersion fields for 33 ETGs, including fast (FRs) and slow rotators (SRs). The velocity fields were reconstructed from the measured PN velocities using an adaptive kernel procedure validated with simulations, and extend to a median of 5.6 effective radii (Re). We complemented the PN kinematics with absorption line data from the literature, for a complete description of the kinematics from the center to the outskirts. Results. ETGs typically show a kinematic transition between inner regions and halo. Estimated transition radii in units of Re anti-correlate with stellar mass. SRs have increased but still modest rotational support at large radii. Most of the FRs show a decrease in rotation, due to the fading of the inner disk in the outer, more slowly rotating spheroid. 30% of the FRs are dominated by rotation also at large radii. Most ETGs have flat or slightly falling halo velocity dispersion profiles, but 15% of the sample have steeply falling profiles. All of the SRs and 40% of the FRs show signatures of triaxial halos such as kinematic twists or misalignments. We show with illustrative photometric models that this is consistent with the distribution of isophote twists from extended photometry. Conclusions. ETGs have more diverse kinematic properties in their halos than in the central regions. FRs do contain inner disk components but these frequently fade in outer spheroids which are often triaxial. The observed kinematic transition to the halo and its dependence on stellar mass is consistent with ΛCDM simulations and supports a two-phase formation scenario.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 618 (Oct. 2018), A94, 50 p.Galaxias elipticasGalaxias lenticularesHalosCinemática estelarDinamica estelarGalaxies: elliptical and lenticular, cDGalaxies: generalGalaxies: halosGalaxies: kinematics and dynamicsGalaxy: structureThe extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar massEstrangeiroinfo: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:UFRGSTEXT001107262.pdf.txt001107262.pdf.txtExtracted Texttext/plain212626http://www.lume.ufrgs.br/bitstream/10183/203860/2/001107262.pdf.txtec8aa06665cc7758721ce2236ef22c34MD52ORIGINAL001107262.pdfTexto completo (inglês)application/pdf15230761http://www.lume.ufrgs.br/bitstream/10183/203860/1/001107262.pdf93482d9c8d3ba2f896c5d91f568d337aMD5110183/2038602019-12-28 05:03:18.15562oai:www.lume.ufrgs.br:10183/203860Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2019-12-28T07:03:18Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
title The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
spellingShingle The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
Pulsoni, Claudia
Galaxias elipticas
Galaxias lenticulares
Halos
Cinemática estelar
Dinamica estelar
Galaxies: elliptical and lenticular, cD
Galaxies: general
Galaxies: halos
Galaxies: kinematics and dynamics
Galaxy: structure
title_short The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
title_full The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
title_fullStr The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
title_full_unstemmed The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
title_sort The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass
author Pulsoni, Claudia
author_facet Pulsoni, Claudia
Gerhard, Ortwin
Arnaboldi, Magda
Coccato, Lodovico
Longobardi, Alessia
Napolitano, Nicola R.
Moylan, Emily K. M.
Narayan, Chaitra A.
Gupta, V.
Burkert, Andreas
Capaccioli, M.
Chies-Santos, Ana Leonor
Cortesi, Arianna
Freeman, Kenneth C.
Kuijken, Koenraad H.
Merrifield, Michael
Romanowsky, Aaron J.
Tortora, Crescenzo
author_role author
author2 Gerhard, Ortwin
Arnaboldi, Magda
Coccato, Lodovico
Longobardi, Alessia
Napolitano, Nicola R.
Moylan, Emily K. M.
Narayan, Chaitra A.
Gupta, V.
Burkert, Andreas
Capaccioli, M.
Chies-Santos, Ana Leonor
Cortesi, Arianna
Freeman, Kenneth C.
Kuijken, Koenraad H.
Merrifield, Michael
Romanowsky, Aaron J.
Tortora, Crescenzo
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Pulsoni, Claudia
Gerhard, Ortwin
Arnaboldi, Magda
Coccato, Lodovico
Longobardi, Alessia
Napolitano, Nicola R.
Moylan, Emily K. M.
Narayan, Chaitra A.
Gupta, V.
Burkert, Andreas
Capaccioli, M.
Chies-Santos, Ana Leonor
Cortesi, Arianna
Freeman, Kenneth C.
Kuijken, Koenraad H.
Merrifield, Michael
Romanowsky, Aaron J.
Tortora, Crescenzo
dc.subject.por.fl_str_mv Galaxias elipticas
Galaxias lenticulares
Halos
Cinemática estelar
Dinamica estelar
topic Galaxias elipticas
Galaxias lenticulares
Halos
Cinemática estelar
Dinamica estelar
Galaxies: elliptical and lenticular, cD
Galaxies: general
Galaxies: halos
Galaxies: kinematics and dynamics
Galaxy: structure
dc.subject.eng.fl_str_mv Galaxies: elliptical and lenticular, cD
Galaxies: general
Galaxies: halos
Galaxies: kinematics and dynamics
Galaxy: structure
description Context. In the hierarchical two-phase formation scenario, the halos of early type galaxies (ETGs) are expected to have different physical properties from the galaxies’ central regions. Aims. The ePN.S survey characterizes the kinematic properties of ETG halos using planetary nebulae (PNe) as tracers, overcoming the limitations of absorption line spectroscopy at low surface brightness. Methods. We present two-dimensional velocity and velocity dispersion fields for 33 ETGs, including fast (FRs) and slow rotators (SRs). The velocity fields were reconstructed from the measured PN velocities using an adaptive kernel procedure validated with simulations, and extend to a median of 5.6 effective radii (Re). We complemented the PN kinematics with absorption line data from the literature, for a complete description of the kinematics from the center to the outskirts. Results. ETGs typically show a kinematic transition between inner regions and halo. Estimated transition radii in units of Re anti-correlate with stellar mass. SRs have increased but still modest rotational support at large radii. Most of the FRs show a decrease in rotation, due to the fading of the inner disk in the outer, more slowly rotating spheroid. 30% of the FRs are dominated by rotation also at large radii. Most ETGs have flat or slightly falling halo velocity dispersion profiles, but 15% of the sample have steeply falling profiles. All of the SRs and 40% of the FRs show signatures of triaxial halos such as kinematic twists or misalignments. We show with illustrative photometric models that this is consistent with the distribution of isophote twists from extended photometry. Conclusions. ETGs have more diverse kinematic properties in their halos than in the central regions. FRs do contain inner disk components but these frequently fade in outer spheroids which are often triaxial. The observed kinematic transition to the halo and its dependence on stellar mass is consistent with ΛCDM simulations and supports a two-phase formation scenario.
publishDate 2018
dc.date.issued.fl_str_mv 2018
dc.date.accessioned.fl_str_mv 2019-12-27T04:04:24Z
dc.type.driver.fl_str_mv Estrangeiro
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dc.identifier.uri.fl_str_mv http://hdl.handle.net/10183/203860
dc.identifier.issn.pt_BR.fl_str_mv 0004-6361
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dc.relation.ispartof.pt_BR.fl_str_mv Astronomy and astrophysics. Les Ulis. Vol. 618 (Oct. 2018), A94, 50 p.
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eu_rights_str_mv openAccess
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