A new Milk Way halo star cluster in the southern galactic sky
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UFRGS |
Texto Completo: | http://hdl.handle.net/10183/109064 |
Resumo: | We report on the discovery of a new Milky Way (MW) companion stellar system located at (αJ 2000, δJ 2000) = (22h10 m 43 s. 15,14º56'58".8). The discovery was made using the eighth data release of SDSS after applying an automated method to search for overdensities in the Baryon Oscillation Spectroscopic Survey footprint. Follow-up observations were performed using Canada–France–Hawaii-Telescope/MegaCam, which reveal that this system is comprised of an old stellar population, located at a distance of 31.9+1.0 −1.6 kpc, with a half-light radius of rh = 7.24+1.94 −1.29 pc and a concentration parameter of c = log10(rt/rc) = 1.55. A systematic isochrone fit to its color–magnitude diagram resulted in log (age yr-ˡ) = 10.07+0.05 −0.03 and [Fe/H] = −1.58+0.08 −0.13. These quantities are typical of globular clusters in the MW halo. The newly found object is of low stellar mass, whose observed excess relative to the background is caused by 95 ± 6 stars. The direct integration of its background decontaminated luminosity function leads to an absolute magnitude of MV = −1.21 ± 0.66. The resulting surface brightness is μV = 25.90 mag arcsec-². Its position in the MV versus rh diagram lies close to AM4 and Koposov 1, which are identified as star clusters. The object is most likely a very faint star cluster—one of the faintest and lowest mass systems yet identified. |
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Balbinot, EduardoSantiago, Basilio XavierCosta, Luiz N. daMaia, Marcio Antonio GeimbaMajewski, Steven RaymondNidever, D.L.Rocha-Pinto, H.J.Thomas, D.Wechsler, Risa H.Yanny, Brian2015-01-20T02:15:20Z20130004-637Xhttp://hdl.handle.net/10183/109064000900517We report on the discovery of a new Milky Way (MW) companion stellar system located at (αJ 2000, δJ 2000) = (22h10 m 43 s. 15,14º56'58".8). The discovery was made using the eighth data release of SDSS after applying an automated method to search for overdensities in the Baryon Oscillation Spectroscopic Survey footprint. Follow-up observations were performed using Canada–France–Hawaii-Telescope/MegaCam, which reveal that this system is comprised of an old stellar population, located at a distance of 31.9+1.0 −1.6 kpc, with a half-light radius of rh = 7.24+1.94 −1.29 pc and a concentration parameter of c = log10(rt/rc) = 1.55. A systematic isochrone fit to its color–magnitude diagram resulted in log (age yr-ˡ) = 10.07+0.05 −0.03 and [Fe/H] = −1.58+0.08 −0.13. These quantities are typical of globular clusters in the MW halo. The newly found object is of low stellar mass, whose observed excess relative to the background is caused by 95 ± 6 stars. The direct integration of its background decontaminated luminosity function leads to an absolute magnitude of MV = −1.21 ± 0.66. The resulting surface brightness is μV = 25.90 mag arcsec-². Its position in the MV versus rh diagram lies close to AM4 and Koposov 1, which are identified as star clusters. The object is most likely a very faint star cluster—one of the faintest and lowest mass systems yet identified.application/pdfengThe astrophysical journal. Bristol. Vol. 767, no. 2 (Apr. 2013), 101, 6 p.Aglomerados estelares globularesGalaxiaMassa estelarEspectros estelaresGalaxies: dwarfGlobular clusters: generalLocal groupA new Milk Way halo star cluster in the southern galactic skyEstrangeiroinfo: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:UFRGSORIGINAL000900517.pdf000900517.pdfTexto completo (inglês)application/pdf515900http://www.lume.ufrgs.br/bitstream/10183/109064/1/000900517.pdf0171be7b82a4b41c028feef57807702cMD51TEXT000900517.pdf.txt000900517.pdf.txtExtracted Texttext/plain28090http://www.lume.ufrgs.br/bitstream/10183/109064/2/000900517.pdf.txt60acad4740d2f6dfd3c59cab3e18b06dMD52THUMBNAIL000900517.pdf.jpg000900517.pdf.jpgGenerated Thumbnailimage/jpeg2122http://www.lume.ufrgs.br/bitstream/10183/109064/3/000900517.pdf.jpg063c7a53939a759ecb017e4fc0d9e891MD5310183/1090642023-07-02 03:41:30.126677oai:www.lume.ufrgs.br:10183/109064Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2023-07-02T06:41:30Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false |
dc.title.pt_BR.fl_str_mv |
A new Milk Way halo star cluster in the southern galactic sky |
title |
A new Milk Way halo star cluster in the southern galactic sky |
spellingShingle |
A new Milk Way halo star cluster in the southern galactic sky Balbinot, Eduardo Aglomerados estelares globulares Galaxia Massa estelar Espectros estelares Galaxies: dwarf Globular clusters: general Local group |
title_short |
A new Milk Way halo star cluster in the southern galactic sky |
title_full |
A new Milk Way halo star cluster in the southern galactic sky |
title_fullStr |
A new Milk Way halo star cluster in the southern galactic sky |
title_full_unstemmed |
A new Milk Way halo star cluster in the southern galactic sky |
title_sort |
A new Milk Way halo star cluster in the southern galactic sky |
author |
Balbinot, Eduardo |
author_facet |
Balbinot, Eduardo Santiago, Basilio Xavier Costa, Luiz N. da Maia, Marcio Antonio Geimba Majewski, Steven Raymond Nidever, D.L. Rocha-Pinto, H.J. Thomas, D. Wechsler, Risa H. Yanny, Brian |
author_role |
author |
author2 |
Santiago, Basilio Xavier Costa, Luiz N. da Maia, Marcio Antonio Geimba Majewski, Steven Raymond Nidever, D.L. Rocha-Pinto, H.J. Thomas, D. Wechsler, Risa H. Yanny, Brian |
author2_role |
author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Balbinot, Eduardo Santiago, Basilio Xavier Costa, Luiz N. da Maia, Marcio Antonio Geimba Majewski, Steven Raymond Nidever, D.L. Rocha-Pinto, H.J. Thomas, D. Wechsler, Risa H. Yanny, Brian |
dc.subject.por.fl_str_mv |
Aglomerados estelares globulares Galaxia Massa estelar Espectros estelares |
topic |
Aglomerados estelares globulares Galaxia Massa estelar Espectros estelares Galaxies: dwarf Globular clusters: general Local group |
dc.subject.eng.fl_str_mv |
Galaxies: dwarf Globular clusters: general Local group |
description |
We report on the discovery of a new Milky Way (MW) companion stellar system located at (αJ 2000, δJ 2000) = (22h10 m 43 s. 15,14º56'58".8). The discovery was made using the eighth data release of SDSS after applying an automated method to search for overdensities in the Baryon Oscillation Spectroscopic Survey footprint. Follow-up observations were performed using Canada–France–Hawaii-Telescope/MegaCam, which reveal that this system is comprised of an old stellar population, located at a distance of 31.9+1.0 −1.6 kpc, with a half-light radius of rh = 7.24+1.94 −1.29 pc and a concentration parameter of c = log10(rt/rc) = 1.55. A systematic isochrone fit to its color–magnitude diagram resulted in log (age yr-ˡ) = 10.07+0.05 −0.03 and [Fe/H] = −1.58+0.08 −0.13. These quantities are typical of globular clusters in the MW halo. The newly found object is of low stellar mass, whose observed excess relative to the background is caused by 95 ± 6 stars. The direct integration of its background decontaminated luminosity function leads to an absolute magnitude of MV = −1.21 ± 0.66. The resulting surface brightness is μV = 25.90 mag arcsec-². Its position in the MV versus rh diagram lies close to AM4 and Koposov 1, which are identified as star clusters. The object is most likely a very faint star cluster—one of the faintest and lowest mass systems yet identified. |
publishDate |
2013 |
dc.date.issued.fl_str_mv |
2013 |
dc.date.accessioned.fl_str_mv |
2015-01-20T02:15:20Z |
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/10183/109064 |
dc.identifier.issn.pt_BR.fl_str_mv |
0004-637X |
dc.identifier.nrb.pt_BR.fl_str_mv |
000900517 |
identifier_str_mv |
0004-637X 000900517 |
url |
http://hdl.handle.net/10183/109064 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.ispartof.pt_BR.fl_str_mv |
The astrophysical journal. Bristol. Vol. 767, no. 2 (Apr. 2013), 101, 6 p. |
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openAccess |
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application/pdf |
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