The apparent overdensity of open clusters in the Canis Major overdensity

The exciting debate on the existence and nature of the relatively recent discovery of the so-called Canis Major (CMa) overdensity is re-examined here based on the positions, reddenings, ages and metallicities of Galactic open clusters (OCs). The data used to carry out the current study were taken fr...

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Publicado:	2008
Materias:	Galaxies: dwarf Galaxy: structure Open clusters and associations: general
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17453933_v390_n1_pL54_Piatti http://hdl.handle.net/20.500.12110/paper_17453933_v390_n1_pL54_Piatti
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_17453933_v390_n1_pL54_Piatti
record_format	dspace
spelling	paper:paper_17453933_v390_n1_pL54_Piatti2023-06-08T16:28:22Z The apparent overdensity of open clusters in the Canis Major overdensity Galaxies: dwarf Galaxy: structure Open clusters and associations: general The exciting debate on the existence and nature of the relatively recent discovery of the so-called Canis Major (CMa) overdensity is re-examined here based on the positions, reddenings, ages and metallicities of Galactic open clusters (OCs). The data used to carry out the current study were taken from the recently updated version of the Dias et al.'s 1776 OC catalogue. We found that only Tombaugh 2 is physically located within the main body of CMa. Even if we take into account the whole sample of catalogued OCs with unknown distances, it is statistically expected that only one additional OC could be found within the CMa region. Since the CMa overdensity appears to be quite transparent to dust, only a few OCs in that zone could have been missed. Both metallicity and age distributions of OCs located in the Galactic outer disc, including Tombaugh 2 and those projected on to CMa, are in good agreement with the paradigm of a main dispersion of age and metallicity values. There are only marginal indications for a radial abundance variation. We conclude that CMa does not contain a significant population of OCs which share its properties. This result does not favour the dwarf galaxy scenario. © 2008 The Authors. Journal compilation © 2008 RAS. 2008 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17453933_v390_n1_pL54_Piatti http://hdl.handle.net/20.500.12110/paper_17453933_v390_n1_pL54_Piatti
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Galaxies: dwarf Galaxy: structure Open clusters and associations: general
spellingShingle	Galaxies: dwarf Galaxy: structure Open clusters and associations: general The apparent overdensity of open clusters in the Canis Major overdensity
topic_facet	Galaxies: dwarf Galaxy: structure Open clusters and associations: general
description	The exciting debate on the existence and nature of the relatively recent discovery of the so-called Canis Major (CMa) overdensity is re-examined here based on the positions, reddenings, ages and metallicities of Galactic open clusters (OCs). The data used to carry out the current study were taken from the recently updated version of the Dias et al.'s 1776 OC catalogue. We found that only Tombaugh 2 is physically located within the main body of CMa. Even if we take into account the whole sample of catalogued OCs with unknown distances, it is statistically expected that only one additional OC could be found within the CMa region. Since the CMa overdensity appears to be quite transparent to dust, only a few OCs in that zone could have been missed. Both metallicity and age distributions of OCs located in the Galactic outer disc, including Tombaugh 2 and those projected on to CMa, are in good agreement with the paradigm of a main dispersion of age and metallicity values. There are only marginal indications for a radial abundance variation. We conclude that CMa does not contain a significant population of OCs which share its properties. This result does not favour the dwarf galaxy scenario. © 2008 The Authors. Journal compilation © 2008 RAS.
title	The apparent overdensity of open clusters in the Canis Major overdensity
title_short	The apparent overdensity of open clusters in the Canis Major overdensity
title_full	The apparent overdensity of open clusters in the Canis Major overdensity
title_fullStr	The apparent overdensity of open clusters in the Canis Major overdensity
title_full_unstemmed	The apparent overdensity of open clusters in the Canis Major overdensity
title_sort	apparent overdensity of open clusters in the canis major overdensity
publishDate	2008
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17453933_v390_n1_pL54_Piatti http://hdl.handle.net/20.500.12110/paper_17453933_v390_n1_pL54_Piatti
_version_	1768542859524308992

The apparent overdensity of open clusters in the Canis Major overdensity

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