Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey
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/10183/141546 |
Resumo: | We report the discovery of an excess of main-sequence turnoff stars in the direction of the constellations of Eridanus and Phoenix from the first-year data of the Dark Energy Survey (DES). The Eridanus–Phoenix (EriPhe) overdensity is centered around l ~ 285 and b ~ -60 and spans at least 30° in longitude and 10° in latitude. The Poisson significance of the detection is at least 9s. The stellar population in the overdense region is similar in brightness and color to that of the nearby globular cluster NGC 1261, indicating that the heliocentric distance of EriPhe is about d ~ 16 kpc. The extent of EriPhe in projection is therefore at least ∼4 kpc by ∼3 kpc. On the sky, this overdensity is located between NGC 1261 and a new stellar stream discovered by DES at a similar heliocentric distance, the so-called Phoenix Stream. Given their similar distance and proximity to each other, it is possible that these three structures may be kinematically associated. Alternatively, the EriPhe overdensity is morphologically similar to the Virgo overdensity and the Hercules–Aquila cloud, which also lie at a similar Galactocentric distance. These three overdensities lie along a polar plane separated by ∼120° and may share a common origin. Spectroscopic follow-up observations of the stars in EriPhe are required to fully understand the nature of this overdensity. |
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Li, T. S.Balbinot, EduardoMondrik, Nicholas PayneMarshall, Jennifer L.Yanny, BrianBechtol, KeithDrlica-Wagner, AlexOscar, Douglas DarcieSantiago, Basilio XavierSimon, Josh D.Vivas, Anna KatherinaWalker, AlistairWang, M.Abbott, Timothy M. C.Abdalla, Filipe B.Benoit-Lévy, AurélienBernstein, Gary M.Bertin, EmmanuelBrooks, D.Burke, David LyleCarnero Rosell, AurelioCarretero Palacios, JorgeCosta, Luiz N. daDePoy, Darren L.Desai, S.Diehl, H. ThomasDoel, PeterEstrada, JuanFinley, David A.Flaugher, BrennaFrieman, Joshua A.Gruen, DanielGruendl, Robert A.Gutierrez, Gaston R.Honscheid, K.James, David J.Kuehn, KylerKuropatkin, Nikolay P.Lahav, OferMaia, Marcio Antonio GeimbaMarch, Marisa CristinaMartini, PaulOgando, Ricardo L.C.Plazas Malagón, Andrés AlejandroReil, KevinRomer, Anita K.Roodman, AaronSanchez-Alvaro, EusebioScarpine, Victor EmanuelSchubnell, MichaelSevilla Noarbe, IgnacioSmith, Robert ChristopherSoares-Santos, MarcelleSobreira, FláviaSuchyta, EricSwanson, Molly E. C.Tarle, GregoryTucker, Douglas L.Zhang, YuanyuanDES Collaboration2016-05-21T02:09:34Z20160004-637Xhttp://hdl.handle.net/10183/141546000991570We report the discovery of an excess of main-sequence turnoff stars in the direction of the constellations of Eridanus and Phoenix from the first-year data of the Dark Energy Survey (DES). The Eridanus–Phoenix (EriPhe) overdensity is centered around l ~ 285 and b ~ -60 and spans at least 30° in longitude and 10° in latitude. The Poisson significance of the detection is at least 9s. The stellar population in the overdense region is similar in brightness and color to that of the nearby globular cluster NGC 1261, indicating that the heliocentric distance of EriPhe is about d ~ 16 kpc. The extent of EriPhe in projection is therefore at least ∼4 kpc by ∼3 kpc. On the sky, this overdensity is located between NGC 1261 and a new stellar stream discovered by DES at a similar heliocentric distance, the so-called Phoenix Stream. Given their similar distance and proximity to each other, it is possible that these three structures may be kinematically associated. Alternatively, the EriPhe overdensity is morphologically similar to the Virgo overdensity and the Hercules–Aquila cloud, which also lie at a similar Galactocentric distance. These three overdensities lie along a polar plane separated by ∼120° and may share a common origin. Spectroscopic follow-up observations of the stars in EriPhe are required to fully understand the nature of this overdensity.application/pdfengThe astrophysical journal. Bristol. Vol. 817, no. 2 (Feb. 2016), 135, 11 p.Via lácteaGaláxiasGalaxy: formationGalaxy: haloGalaxy: structureLocal groupDiscovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy SurveyEstrangeiroinfo: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:UFRGSORIGINAL000991570.pdf000991570.pdfTexto completo (inglês)application/pdf1737974http://www.lume.ufrgs.br/bitstream/10183/141546/1/000991570.pdf9e1bfeff30c074d1de1eea8d90014558MD51TEXT000991570.pdf.txt000991570.pdf.txtExtracted Texttext/plain56309http://www.lume.ufrgs.br/bitstream/10183/141546/2/000991570.pdf.txt2a2129531307aa396fac985f4789df3fMD52THUMBNAIL000991570.pdf.jpg000991570.pdf.jpgGenerated Thumbnailimage/jpeg1770http://www.lume.ufrgs.br/bitstream/10183/141546/3/000991570.pdf.jpgac68c7de3d981b6c61539f17b7874958MD5310183/1415462023-07-02 03:42:18.981241oai:www.lume.ufrgs.br:10183/141546Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-02T06:42:18Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey |
title |
Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey |
spellingShingle |
Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey Li, T. S. Via láctea Galáxias Galaxy: formation Galaxy: halo Galaxy: structure Local group |
title_short |
Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey |
title_full |
Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey |
title_fullStr |
Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey |
title_full_unstemmed |
Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey |
title_sort |
Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey |
author |
Li, T. S. |
author_facet |
Li, T. S. Balbinot, Eduardo Mondrik, Nicholas Payne Marshall, Jennifer L. Yanny, Brian Bechtol, Keith Drlica-Wagner, Alex Oscar, Douglas Darcie Santiago, Basilio Xavier Simon, Josh D. Vivas, Anna Katherina Walker, Alistair Wang, M. Abbott, Timothy M. C. Abdalla, Filipe B. Benoit-Lévy, Aurélien Bernstein, Gary M. Bertin, Emmanuel Brooks, D. Burke, David Lyle Carnero Rosell, Aurelio Carretero Palacios, Jorge Costa, Luiz N. da DePoy, Darren L. Desai, S. Diehl, H. Thomas Doel, Peter Estrada, Juan Finley, David A. Flaugher, Brenna Frieman, Joshua A. Gruen, Daniel Gruendl, Robert A. Gutierrez, Gaston R. Honscheid, K. James, David J. Kuehn, Kyler Kuropatkin, Nikolay P. Lahav, Ofer Maia, Marcio Antonio Geimba March, Marisa Cristina Martini, Paul Ogando, Ricardo L.C. Plazas Malagón, Andrés Alejandro Reil, Kevin Romer, Anita K. Roodman, Aaron Sanchez-Alvaro, Eusebio Scarpine, Victor Emanuel Schubnell, Michael Sevilla Noarbe, Ignacio Smith, Robert Christopher Soares-Santos, Marcelle Sobreira, Flávia Suchyta, Eric Swanson, Molly E. C. Tarle, Gregory Tucker, Douglas L. Zhang, Yuanyuan DES Collaboration |
author_role |
author |
author2 |
Balbinot, Eduardo Mondrik, Nicholas Payne Marshall, Jennifer L. Yanny, Brian Bechtol, Keith Drlica-Wagner, Alex Oscar, Douglas Darcie Santiago, Basilio Xavier Simon, Josh D. Vivas, Anna Katherina Walker, Alistair Wang, M. Abbott, Timothy M. C. Abdalla, Filipe B. Benoit-Lévy, Aurélien Bernstein, Gary M. Bertin, Emmanuel Brooks, D. Burke, David Lyle Carnero Rosell, Aurelio Carretero Palacios, Jorge Costa, Luiz N. da DePoy, Darren L. Desai, S. Diehl, H. Thomas Doel, Peter Estrada, Juan Finley, David A. Flaugher, Brenna Frieman, Joshua A. Gruen, Daniel Gruendl, Robert A. Gutierrez, Gaston R. Honscheid, K. James, David J. Kuehn, Kyler Kuropatkin, Nikolay P. Lahav, Ofer Maia, Marcio Antonio Geimba March, Marisa Cristina Martini, Paul Ogando, Ricardo L.C. Plazas Malagón, Andrés Alejandro Reil, Kevin Romer, Anita K. Roodman, Aaron Sanchez-Alvaro, Eusebio Scarpine, Victor Emanuel Schubnell, Michael Sevilla Noarbe, Ignacio Smith, Robert Christopher Soares-Santos, Marcelle Sobreira, Flávia Suchyta, Eric Swanson, Molly E. C. Tarle, Gregory Tucker, Douglas L. Zhang, Yuanyuan DES Collaboration |
author2_role |
author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Li, T. S. Balbinot, Eduardo Mondrik, Nicholas Payne Marshall, Jennifer L. Yanny, Brian Bechtol, Keith Drlica-Wagner, Alex Oscar, Douglas Darcie Santiago, Basilio Xavier Simon, Josh D. Vivas, Anna Katherina Walker, Alistair Wang, M. Abbott, Timothy M. C. Abdalla, Filipe B. Benoit-Lévy, Aurélien Bernstein, Gary M. Bertin, Emmanuel Brooks, D. Burke, David Lyle Carnero Rosell, Aurelio Carretero Palacios, Jorge Costa, Luiz N. da DePoy, Darren L. Desai, S. Diehl, H. Thomas Doel, Peter Estrada, Juan Finley, David A. Flaugher, Brenna Frieman, Joshua A. Gruen, Daniel Gruendl, Robert A. Gutierrez, Gaston R. Honscheid, K. James, David J. Kuehn, Kyler Kuropatkin, Nikolay P. Lahav, Ofer Maia, Marcio Antonio Geimba March, Marisa Cristina Martini, Paul Ogando, Ricardo L.C. Plazas Malagón, Andrés Alejandro Reil, Kevin Romer, Anita K. Roodman, Aaron Sanchez-Alvaro, Eusebio Scarpine, Victor Emanuel Schubnell, Michael Sevilla Noarbe, Ignacio Smith, Robert Christopher Soares-Santos, Marcelle Sobreira, Flávia Suchyta, Eric Swanson, Molly E. C. Tarle, Gregory Tucker, Douglas L. Zhang, Yuanyuan DES Collaboration |
dc.subject.por.fl_str_mv |
Via láctea Galáxias |
topic |
Via láctea Galáxias Galaxy: formation Galaxy: halo Galaxy: structure Local group |
dc.subject.eng.fl_str_mv |
Galaxy: formation Galaxy: halo Galaxy: structure Local group |
description |
We report the discovery of an excess of main-sequence turnoff stars in the direction of the constellations of Eridanus and Phoenix from the first-year data of the Dark Energy Survey (DES). The Eridanus–Phoenix (EriPhe) overdensity is centered around l ~ 285 and b ~ -60 and spans at least 30° in longitude and 10° in latitude. The Poisson significance of the detection is at least 9s. The stellar population in the overdense region is similar in brightness and color to that of the nearby globular cluster NGC 1261, indicating that the heliocentric distance of EriPhe is about d ~ 16 kpc. The extent of EriPhe in projection is therefore at least ∼4 kpc by ∼3 kpc. On the sky, this overdensity is located between NGC 1261 and a new stellar stream discovered by DES at a similar heliocentric distance, the so-called Phoenix Stream. Given their similar distance and proximity to each other, it is possible that these three structures may be kinematically associated. Alternatively, the EriPhe overdensity is morphologically similar to the Virgo overdensity and the Hercules–Aquila cloud, which also lie at a similar Galactocentric distance. These three overdensities lie along a polar plane separated by ∼120° and may share a common origin. Spectroscopic follow-up observations of the stars in EriPhe are required to fully understand the nature of this overdensity. |
publishDate |
2016 |
dc.date.accessioned.fl_str_mv |
2016-05-21T02:09:34Z |
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/10183/141546 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-637X |
dc.identifier.nrb.pt_BR.fl_str_mv |
000991570 |
identifier_str_mv |
0004-637X 000991570 |
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http://hdl.handle.net/10183/141546 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The astrophysical journal. Bristol. Vol. 817, no. 2 (Feb. 2016), 135, 11 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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