Unveiling a new extragalactic structure hidden by the Milky Way
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/257861 |
Resumo: | Context. The zone of avoidance (ZoA) does not allow for clear optical observations of extragalactic sources behind the Milky Way due to the meaningful extinction of the optical emission of these objects. Observations in near-infrared (NIR) wavelengths represent a potential source of astronomical discoveries that support the detection of new galaxies and potentially complete the picture of the large-scale structures in this as-yet poorly explored area of the sky. Aims. Our aim is to decipher the nature of the overdensity located behind the Milky Way in tile b204 of the VISTA Variables in Vía Láctea (VVV) survey. Methods. We studied an area of six arcmin around a galaxy concentration located at l = 354.82° and b = −9.81°. We selected five galaxies, taking into account the source distribution on the sky to optimise the requested time for the observations, and we obtained the spectra with Flamingos 2 long-slit spectrograph at Gemini South 8.1-meter telescope. To identify and characterise the absorption features, we fit the galaxies underlying spectrum using the STARLIGHT code together with the IRTF stellar library. In addition, the spectroscopic findings are reinforced using complementary photometric techniques such as red-sequence and photometric redshift estimation. Results. The mean spectroscopic redshift estimated from the NIR spectra is z = 0.225 ± 0.014. This value presents a good agreement with that obtained from photometric analysis, photoz = 0.21 ± 0.08, and the probability distribution function of the galaxies in the studied region. Also, the red-sequence slope is consistent with the one expected for NIR observations of galaxy clusters. Conclusions. The redshifts obtained from both, photometric and spectroscopic techniques are in good agreement, allowing for the confirmation of the nature of this structure at z = 0.225 ± 0.014, thereby unveiling a new galaxy cluster, VVVGCl-B J181435-381432, behind the Milky Way bulge. |
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Galdeano, DanielaFerrero, GabrielColdwell Lloveras, Georgina VanesaDuplancic Videla, Maria FernandaAlonso Giraldes, Maria SolRiffel, RogérioMinniti, Dante2023-05-10T03:27:03Z20220004-6361http://hdl.handle.net/10183/257861001162583Context. The zone of avoidance (ZoA) does not allow for clear optical observations of extragalactic sources behind the Milky Way due to the meaningful extinction of the optical emission of these objects. Observations in near-infrared (NIR) wavelengths represent a potential source of astronomical discoveries that support the detection of new galaxies and potentially complete the picture of the large-scale structures in this as-yet poorly explored area of the sky. Aims. Our aim is to decipher the nature of the overdensity located behind the Milky Way in tile b204 of the VISTA Variables in Vía Láctea (VVV) survey. Methods. We studied an area of six arcmin around a galaxy concentration located at l = 354.82° and b = −9.81°. We selected five galaxies, taking into account the source distribution on the sky to optimise the requested time for the observations, and we obtained the spectra with Flamingos 2 long-slit spectrograph at Gemini South 8.1-meter telescope. To identify and characterise the absorption features, we fit the galaxies underlying spectrum using the STARLIGHT code together with the IRTF stellar library. In addition, the spectroscopic findings are reinforced using complementary photometric techniques such as red-sequence and photometric redshift estimation. Results. The mean spectroscopic redshift estimated from the NIR spectra is z = 0.225 ± 0.014. This value presents a good agreement with that obtained from photometric analysis, photoz = 0.21 ± 0.08, and the probability distribution function of the galaxies in the studied region. Also, the red-sequence slope is consistent with the one expected for NIR observations of galaxy clusters. Conclusions. The redshifts obtained from both, photometric and spectroscopic techniques are in good agreement, allowing for the confirmation of the nature of this structure at z = 0.225 ± 0.014, thereby unveiling a new galaxy cluster, VVVGCl-B J181435-381432, behind the Milky Way bulge.application/pdfengAstronomy and astrophysics. Les Ulis. Vol. 669 (Dez. 2022), A7, 8 p.Aglomerados de galaxiasFotometria astronômicaDeslocamento para o vermelhoGalaxy : StructureInfrared : GalaxiesTechniques : SpectroscopicGalaxies : Clusters : GeneralUnveiling a new extragalactic structure hidden by the Milky WayEstrangeiroinfo: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:UFRGSTEXT001162583.pdf.txt001162583.pdf.txtExtracted Texttext/plain40143http://www.lume.ufrgs.br/bitstream/10183/257861/2/001162583.pdf.txt9b3c24ce3162d7e326e8a4af4e609e60MD52ORIGINAL001162583.pdfTexto completo (inglês)application/pdf2050561http://www.lume.ufrgs.br/bitstream/10183/257861/1/001162583.pdfcac77bbedb5e83fc48006bfb15027c28MD5110183/2578612023-09-24 03:37:45.99966oai:www.lume.ufrgs.br:10183/257861Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-09-24T06:37:45Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
Unveiling a new extragalactic structure hidden by the Milky Way |
title |
Unveiling a new extragalactic structure hidden by the Milky Way |
spellingShingle |
Unveiling a new extragalactic structure hidden by the Milky Way Galdeano, Daniela Aglomerados de galaxias Fotometria astronômica Deslocamento para o vermelho Galaxy : Structure Infrared : Galaxies Techniques : Spectroscopic Galaxies : Clusters : General |
title_short |
Unveiling a new extragalactic structure hidden by the Milky Way |
title_full |
Unveiling a new extragalactic structure hidden by the Milky Way |
title_fullStr |
Unveiling a new extragalactic structure hidden by the Milky Way |
title_full_unstemmed |
Unveiling a new extragalactic structure hidden by the Milky Way |
title_sort |
Unveiling a new extragalactic structure hidden by the Milky Way |
author |
Galdeano, Daniela |
author_facet |
Galdeano, Daniela Ferrero, Gabriel Coldwell Lloveras, Georgina Vanesa Duplancic Videla, Maria Fernanda Alonso Giraldes, Maria Sol Riffel, Rogério Minniti, Dante |
author_role |
author |
author2 |
Ferrero, Gabriel Coldwell Lloveras, Georgina Vanesa Duplancic Videla, Maria Fernanda Alonso Giraldes, Maria Sol Riffel, Rogério Minniti, Dante |
author2_role |
author author author author author author |
dc.contributor.author.fl_str_mv |
Galdeano, Daniela Ferrero, Gabriel Coldwell Lloveras, Georgina Vanesa Duplancic Videla, Maria Fernanda Alonso Giraldes, Maria Sol Riffel, Rogério Minniti, Dante |
dc.subject.por.fl_str_mv |
Aglomerados de galaxias Fotometria astronômica Deslocamento para o vermelho |
topic |
Aglomerados de galaxias Fotometria astronômica Deslocamento para o vermelho Galaxy : Structure Infrared : Galaxies Techniques : Spectroscopic Galaxies : Clusters : General |
dc.subject.eng.fl_str_mv |
Galaxy : Structure Infrared : Galaxies Techniques : Spectroscopic Galaxies : Clusters : General |
description |
Context. The zone of avoidance (ZoA) does not allow for clear optical observations of extragalactic sources behind the Milky Way due to the meaningful extinction of the optical emission of these objects. Observations in near-infrared (NIR) wavelengths represent a potential source of astronomical discoveries that support the detection of new galaxies and potentially complete the picture of the large-scale structures in this as-yet poorly explored area of the sky. Aims. Our aim is to decipher the nature of the overdensity located behind the Milky Way in tile b204 of the VISTA Variables in Vía Láctea (VVV) survey. Methods. We studied an area of six arcmin around a galaxy concentration located at l = 354.82° and b = −9.81°. We selected five galaxies, taking into account the source distribution on the sky to optimise the requested time for the observations, and we obtained the spectra with Flamingos 2 long-slit spectrograph at Gemini South 8.1-meter telescope. To identify and characterise the absorption features, we fit the galaxies underlying spectrum using the STARLIGHT code together with the IRTF stellar library. In addition, the spectroscopic findings are reinforced using complementary photometric techniques such as red-sequence and photometric redshift estimation. Results. The mean spectroscopic redshift estimated from the NIR spectra is z = 0.225 ± 0.014. This value presents a good agreement with that obtained from photometric analysis, photoz = 0.21 ± 0.08, and the probability distribution function of the galaxies in the studied region. Also, the red-sequence slope is consistent with the one expected for NIR observations of galaxy clusters. Conclusions. The redshifts obtained from both, photometric and spectroscopic techniques are in good agreement, allowing for the confirmation of the nature of this structure at z = 0.225 ± 0.014, thereby unveiling a new galaxy cluster, VVVGCl-B J181435-381432, behind the Milky Way bulge. |
publishDate |
2022 |
dc.date.issued.fl_str_mv |
2022 |
dc.date.accessioned.fl_str_mv |
2023-05-10T03:27:03Z |
dc.type.driver.fl_str_mv |
Estrangeiro info:eu-repo/semantics/article |
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info:eu-repo/semantics/publishedVersion |
format |
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publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10183/257861 |
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0004-6361 |
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001162583 |
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http://hdl.handle.net/10183/257861 |
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dc.relation.ispartof.pt_BR.fl_str_mv |
Astronomy and astrophysics. Les Ulis. Vol. 669 (Dez. 2022), A7, 8 p. |
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info:eu-repo/semantics/openAccess |
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openAccess |
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