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
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , , , , , , , , , , , , , , , |
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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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 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/10183/203860 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-6361 |
dc.identifier.nrb.pt_BR.fl_str_mv |
001107262 |
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0004-6361 001107262 |
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http://hdl.handle.net/10183/203860 |
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eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Les Ulis. Vol. 618 (Oct. 2018), A94, 50 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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