首页> 外文期刊>The Astrophysical journal >SPECTROSCOPIC PROPERTIES OF STAR-FORMING HOST GALAXIES AND TYPE Ia SUPERNOVA HUBBLE RESIDUALS IN A NEARLY UNBIASED SAMPLE
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SPECTROSCOPIC PROPERTIES OF STAR-FORMING HOST GALAXIES AND TYPE Ia SUPERNOVA HUBBLE RESIDUALS IN A NEARLY UNBIASED SAMPLE

机译:在几乎不变的样本中恒星形成星系和Ia型超新星易变残渣的光谱性质

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摘要

We examine the correlation between supernova (SN) host-galaxy properties and their residuals in the Hubble diagram. We use SNe discovered during the Sloan Digital Sky Survey-II Supernova Survey, and focus on objects at a redshift of z 0.15, where the selection effects of the survey are known to yield a complete Type Ia supernova (SN?Ia) sample. To minimize the bias in our analysis with respect to measured host-galaxy properties, spectra were obtained for nearly all hosts, spanning a range in magnitude of –23 Mr –17. In contrast to previous works that use photometric estimates of host mass as a proxy for global metallicity, we analyze host-galaxy spectra to obtain gas-phase metallicities and star formation rates (SFRs) from host galaxies with active star formation. From a final sample of ~40 emission-line galaxies, we find that light-curve-corrected SNe Ia are ~0.1?mag brighter in high-metallicity hosts than in low-metallicity hosts. We also find a significant (3σ) correlation between the Hubble Residuals of SNe Ia and the specific SFR of the host galaxy. We comment on the importance of SN/host-galaxy correlations as a source of systematic bias in future deep SN surveys.
机译:我们在哈勃图中检查了超新星(SN)主机星系属性与其残差之间的相关性。我们使用在斯隆数字天空调查II型超新星调查中发现的SNe,并将重点放在z <0.15的红移上,已知该调查的选择效果会产生完整的Ia型超新星(SN?Ia)样本。为了使我们在分析中相对于测得的宿主星系性质的偏倚最小化,几乎所有宿主均获得了光谱,其范围在–23 3σ)相关性。我们评论了SN /主星系相关性在未来的深度SN调查中作为系统偏见的来源的重要性。
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