1) La descarga del recurso depende de la página de origen
2) Para poder descargar el recurso, es necesario ser usuario registrado en Universia


Opción 1: Descargar recurso

Detalles del recurso

Descripción

The efficient use of Type Ia supernovae (SNIa) for cosmological studies requires knowledge of any parameter that can affect their luminosity in either systematic or statistical ways. Observational samples of SNIa commonly use the metallicity of the host galaxy, Zhost, as an estimator of the supernova progenitor metallicity, ZIa, that is one of the primary factors affecting SNIa magnitude. Here, we present a theoretical study of the relationship between ZIa and Zhost. We follow the chemical evolution of homogeneous galaxy models together with the evolution of the supernova rates in order to evaluate the metallicity distribution function, MDF( Z), i.e. the probability that the logarithm of the metallicity of a SNIa exploding now differs in less than Z from that of its host. We analyse several model galaxies aimed to represent from active to passive galaxies, including dwarf galaxies prone to experience supernova driven outflows. We analyse as well the sensitivity of the MDF to the most uncertain ingredients of our approach: IMF, star-formation law, stellar lifetime, stellar yields, and SNIa delay-time distribution (DTD). Our results show a remarkable degree of agreement between the mean ¯ZIa in a galaxy and its Zhost when they both are measured as the CNO abundance, especially if the DTD peaks at small time delays, while the average Fe abundance of host and SNIa may differ up to 0.4-0.6 dex in passive galaxies. The dispersion of ZIa in active galaxy models is quite small, meaning that Zhost is a quite good estimator of the supernovametallicity. Passive galaxies present a larger dispersion, which is more pronounced in low mass galaxies.We present a procedure to generate random SNIa metallicities, given the host metallicity. We also discuss the use of differentmetallicity indicators: Fe vs. O, and gas-phasemetallicity vs. stellar metallicity. Finally, the results of the application of our formalism to a galactic catalogue (VESPA) suggest that SNIa come, in average, from small metallicity progenitors both at low redshifts (contrary to expectations) and in galaxies with high star-formation activity. In spite of large uncertainties in the metallicities derived from the catalogue, the gross trends of ¯ZIa vs. Zhost obtained from VESPA for different galaxy types are roughly consistent with our theoretical estimates.

Pertenece a

UPCommons - E-prints UPC Universitat Politècnica de Catalunya   

Autor(es)

Bravo Guil, Eduardo -  Badenes Montoliu, Carles - 

Id.: 52940862

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Tipo:  15 p. - 

Palabras claveÀrees temàtiques de la UPC -  Física -  Astronomia i astrofísica - 

Tipo de recurso: Article  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: Open Access

Formatos:  15 p. - 

Requerimientos técnicos:  Browser: Any - 

Relación: [References] http://arxiv.org/abs/1102.1586

Fecha de contribución: 10-oct-2013

Contacto:

Localización:
* Bravo, E.; Badenes, C. Is the metallicity of their host galaxies a good measure of the metallicity of Type Ia supernovae?. "Monthly notices of the Royal Astronomical Society", Juny 2011, vol. 414, p. 1592-1606.
* 0035-8711
* doi:10.1111/j.1365-2966.2011.18498.x

Otros recursos que te pueden interesar

  1. Tailoring the magnetization states in 2D arrays of multiresponse ferromagnetic nanomagnets We have fabricated Fe52-54Co46-48 nanomagnet arrays as a function of several geometrical parameters ...
  2. Termodinámica y sincronización en sistemas cuánticos abiertos Los efectos disipativos tienen profundas consecuencias en el comportamiento y las propiedades de los...
  3. Síntesis y caracterización de nano- y microestructuras basadas en SnO₂ y Li₂SnO₃ con aplicaciones en dispositivos ópticos y células solares híbridas En esta memoria de tesis doctoral se exponen y discuten los resultados más relevantes de la investig...
  4. Theory of acceptor-ground-state description and hot photoluminescence in cubic semiconductors An approach to the theory of the acceptor ground state in cubic semiconductors is presented. The mod...
  5. Condition for resonant optical bistability We address a two-level system in an environment interacting with an electromagnetic field in the dip...

Otros recursos de la mismacolección

No existen otros recursos

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.