Friday, October 31, 2014

 

 



Soy un nuevo usuario

Olvidé mi contraseña

Entrada usuarios

Lógica Matemáticas Astronomía y Astrofísica Física Química Ciencias de la Vida
Ciencias de la Tierra y Espacio Ciencias Agrarias Ciencias Médicas Ciencias Tecnológicas Antropología Demografía
Ciencias Económicas Geografía Historia Ciencias Jurídicas y Derecho Lingüística Pedagogía
Ciencia Política Psicología Artes y Letras Sociología Ética Filosofía


Is the metallicity of their host galaxies a good measure of the metallicity of Type Ia supernovae?

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


  Descargar recurso

Detalles del recurso

Pertenece a: UPCommons - E-prints UPC Universitat Politècnica de Catalunya   

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.

Autor(es): Bravo Guil, Eduardo -  Badenes Montoliu, Carles - 

Id.: 52940862

Idioma: English  - 

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 del mismo autor(es)

  1. Cobalt-56 gamma-ray emission lines from the type Ia supernova 2014J A type Ia supernova is thought to be a thermonuclear explosion of either a single carbon–oxygen whit...
  2. Dark energy and thermonuclear supernovae Nowadays it is widely accepted that the current Universe is dominated by dark energy and exotic matt...
  3. Dark energy and thermonuclear supernovae Nowadays it is widely accepted that the current Universe is dominated by dark energy and exotic matt...
  4. Simulations of radiative shocks and jet formation in laboratory plasmas We present the simulations of two relevant hydrodynamical problems related to astrophysical phenomen...
  5. Simulations of radiative shocks and jet formation in laboratory plasmas We present the simulations of two relevant hydrodynamical problems related to astrophysical phenomen...

Otros recursos de la misma colección

  1. Air quality forecasts on a kilometer-scale grid over complex Spanish terrains The CALIOPE Air Quality Forecast System (CALIOPE-AQFS) represents the current state of the art in ai...
  2. EARLINET dust observations vs. BSC-DREAM8b modeled profiles: 12-year-long systematic comparison at Potenza, Italy In this paper, we report the first systematic comparison of 12-year modeled dust extinction profiles...
  3. ParTes. Test suite for parsing evaluation This paper presents ParTes, the first test suite in Spanish and Catalan for parsing qualitative eval...
  4. DInSAR pixel selection based on sublook spectral correlation along time The reliability of any final differential synthetic aperture radar (SAR) interferometry (DInSAR) pro...
  5. Atmospheric phase screen compensation in ground-based sar with a multiple-regression model over mountainous regions In this paper, a new model-based technique for the compensation of severe height-dependent atmospher...

Valoración de los usuarios

No hay ninguna valoración para este recurso.Sea el primero en valorar este recurso.
 

Busque un recurso