The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
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The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo
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| Id. |
38563118 |
| Idioma |
inglés
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| Titulo |
The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo |
| Autor(es) |
Camacho Díaz, Judit
Torres Gil, Santiago
Isern Villaboy, Jordi
Althaus, Leandro
García-Berro Montilla, Enrique
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| Localización |
Camacho Díaz, J.; Torres Gil, S.; Isern Villaboy, J.; Althaus, L.; García-Berro Montilla, E. The contribution of oxygen-neon white dwarfs to the MACHO content of the Galactic halo. Astronomy & Astrophysics, 2007, vol. 471, p 151-158
0365-0138
http://hdl.handle.net/2117/1373
http://hdl.handle.net/2072/8574
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| Versión |
1.0 |
| Estado |
Final
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| Descripción |
Context. The interpretation of microlensing results towards the Large Magellanic Cloud (LMC) still remains controversial. Whitedwarfs have been proposed to explain these results and, hence, to contribute significantly to the mass budget of our Galaxy. However, several constraints on the role played by regular carbon-oxygen white dwarfs exist.Aims. Massive white dwarfs are thought to be made of a mixture of oxygen and neon. Correspondingly, their cooling rate is largerthan those of typical carbon-oxygen white dwarfs and they fade to invisibility in short timescales. Consequently, they constitute a good candidate for explaining the microlensing results.Methods. Here, we examine in detail this hypothesis by using the most recent and up-to-date cooling tracks for massive white dwarfs and a Monte Carlo simulator which takes into account the most relevant Galactic inputs.Results.We find that oxygen-neon white dwarfs cannot account for a substantial fraction of the microlensing depth towards the LMC,independently of the adopted initial mass function, although some microlensing events could be due to oxygen-neon white dwarfs.Conclusions.The white dwarf population contributes at most a 5% to the mass of the Galactic halo.
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| Tipo |
8 pàgs
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| Palabras clave |
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
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| Tipo de Interactividad |
Expositivo
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| Nivel de Interactividad |
muy bajo
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| Audiencia |
Estudiante
Profesor
Autor
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| Estructura |
Atomic |
| Coste |
no
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| Copyright |
sí
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| Formatos |
8 pàgs
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| Requerimientos técnicos |
Browser: Any
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| Relación |
[IsBasedOn] AYA05-08013-C03-C01, AYA05-08013-C03-C02
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| Fecha de contribución |
16-may-2009 |
| Contacto |
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