Dependence of low redshift Type Ia Supernovae luminosities on host galaxies  

作　　者：Wen-Ke Liang Jian-Cheng Wang 

机构地区：[1]National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences [2]Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences [3]University of Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2013年第9期1087-1096,共10页天文和天体物理学研究（英文版）

基　　金：financial support from the National Basic Research Program of China (973 Program; 2009CB824800);the National Natural Science Foundation of China (Grant Nos. 11133006; 11163006 and 11173054);the Policy Research Program of Chinese Academy of Sciences (KJCX2-YW-T24)

摘　　要：We study the relation between Type Ia Supernovae （SNe Ia） and properties of their host galaxies using a large sample with low redshift. By examining the Hubble residuals of the entire sample from the best-fit cosmology, we show that SNe Ia in passive hosts are brighter than those in star-forming hosts after light curve correction at the 2. 1σ confidence level. We find that SNe Ia in high luminosity hosts are brighter after light-curve correction at the 〉 3σ confidence level. We also find that SNe Ia in large galaxies are brighter after light-curve correction at the ≥2σ confidence level. We demonstrate that the residuals depend linearly on host luminosity at a confidence of 4or or host size at a confidence of 3.3σ.We study the relation between Type Ia Supernovae （SNe Ia） and properties of their host galaxies using a large sample with low redshift. By examining the Hubble residuals of the entire sample from the best-fit cosmology, we show that SNe Ia in passive hosts are brighter than those in star-forming hosts after light curve correction at the 2. 1σ confidence level. We find that SNe Ia in high luminosity hosts are brighter after light-curve correction at the 〉 3σ confidence level. We also find that SNe Ia in large galaxies are brighter after light-curve correction at the ≥2σ confidence level. We demonstrate that the residuals depend linearly on host luminosity at a confidence of 4or or host size at a confidence of 3.3σ.

关 键 词：supernovae： general -- distance scale -- galaxies： classification 

分 类 号：P145.3[天文地球—天体物理] P145.8[天文地球—天文学]