منابع مشابه
The supernova rate per unit mass
We compute the rate of supernovae (SNe) of different types along the Hubble sequence normalized to the near-infrared luminosity and to the stellar mass of the parent galaxies. This is made possible by the new complete catalog of near-infrared galaxy magnitudes obtained by 2MASS. We find that the rates of all SN types, including Ia, Ib/c and II, show a sharp dependence on both the morphology and...
متن کاملThe Infrared Supernova Rate
Supernovae (SNe) exploding inside dusty regions could dominate, even by a large amount, the number of core-collapse events in the universe, as most of the starforming activity is hidden by dust. Nevertheless, centuries of optical searches have discovered only very few SNe in dusty regions and no very obscured event. This is clearly a selection effect, and infrared or radio observations are need...
متن کاملThe Type Ia Supernova Rate
We explore the idea that the Type Ia supernovae (SNe Ia) rate is made up of two components: a prompt piece that is proportional to the star formation rate (SFR) and an extended piece that is proportional to the total stellar mass. We fit the parameters of this model to the local observations of Mannucci and collaborators and then study its impact on three important problems. On cosmic scales, t...
متن کاملThe rate of supernovae II . The selection effects and the frequencies per unit blue luminosity
We present new estimates of the observed rates of SNe determined with the control time method applied to the files of observations of two long term, photographic SN searches carried out at the Asiago and Sternberg Observatories. Our calculations are applied to a galaxy sample extracted from RC3, in which 65 SNe have been discovered. This relatively large number of SNe has been redistributed in ...
متن کاملModule B 4 Per Unit
Primary Author: Vijay Vittal, Iowa State University Email Address: [email protected] Co-author: None Prerequisite Competencies: 1. Three-phase Power Calculations, found in B3 2. Transformer operation, found in T2. Module Objectives: 1. Transform per phase and three phase circuit quantities from Standard International (SI) units to per unit. 2. Transform per unit circuit quantities to per phas...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2005
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20041411