论文标题
Carnegie Supernova Project-I:IA型超新星及其宿主星系之间的相关性从光学到近红外带
The Carnegie Supernova Project-I: Correlation Between Type Ia Supernovae and Their Host Galaxies from Optical to Near-Infrared Bands
论文作者
论文摘要
我们介绍了IA Supernovae型宿主星系的光学和近红外($ ugriyjh $)的光度法(SN〜IA),由\ textit {Carnegie Supernova Project-i}观察到。我们确定宿主星系恒星质量,并首次研究它们与光学和近红外($ ubgvriyjh $)跨度的SN〜IA标准化光度的相关性。在单个频段中,我们发现Sne〜iA在更大的宿主中更加发光,其光度偏移量之间的范围为$ -0.07 \ pm0.03 $ mag至$ -0.15 \ pm0.04 $ mag,经过轻曲线标准化。在所有$ ubgvriyjh $ bands中,sn〜ia hubble残留寄宿质量关系的斜率为负,价值在$ -0.036 \ pm 0.025 $ 0.025 $ mag/dex至$ -0.097 \ $ -0.097 \ pm 0.027 $ mag/dex中 - 比预期的是大型广播中的sne 〜ia ia sne〜ia是bright bright bright bright bright bright的。近恒定观察到的光学带和近红外带之间的相关性表明,尘埃在观察到的光度偏移量 - 主质量相关性中可能不起作用。我们测量了SNE〜IA与其寄宿中心之间的预计分离,发现超出预计10 kpc超出预计的Sne〜ia具有$ \ rm 30 \%\至50 \%$ $ $ $ $ $ $ $ $减少所有乐队中哈勃残差的分散性 - 使它们在Sne〜ia中变得更加均匀。宿主星系中的灰尘,附近Sn〜ia的特殊速度或两者的组合可能会驱动这一结果,因为发现超过10 kpc的SNE〜IA的颜色通常低于内部的颜色,但由于我们排除附近的事件,分散体的趋势也有所减少。我们发现,当SN〜IA平均亮度分组为各种宿主形态类型时,它们的平均光度会有很大差异。这项工作的主机银河数据将在限制宇宙学参数方面与未来的高红移样本结合使用。
We present optical and near-infrared ($ugriYJH$) photometry of host galaxies of Type Ia supernovae (SN~Ia) observed by the \textit{Carnegie Supernova Project-I}. We determine host galaxy stellar masses and, for the first time, study their correlation with SN~Ia standardized luminosity across optical and near-infrared ($uBgVriYJH$) bands. In the individual bands, we find that SNe~Ia are more luminous in more massive hosts with luminosity offsets ranging between $-0.07 \pm0.03$ mag to $-0.15\pm0.04$ mag after light-curve standardization. The slope of the SN~Ia Hubble residual-host mass relation is negative across all $uBgVriYJH$ bands with values ranging between $-0.036\pm 0.025$ mag/dex to $-0.097\pm 0.027$ mag/dex -- implying that SNe~Ia in more massive galaxies are brighter than expected. The near-constant observed correlations across optical and near-infrared bands indicate that dust may not play a significant role in the observed luminosity offset--host mass correlation. We measure projected separations between SNe~Ia and their host centers, and find that SNe~Ia that explode beyond a projected 10 kpc have a $\rm 30\% \ to \ 50\%$ reduction of the dispersion in Hubble residuals across all bands -- making them a more uniform subset of SNe~Ia. Dust in host galaxies, peculiar velocities of nearby SN~Ia, or a combination of both may drive this result as the color excesses of SNe~Ia beyond 10 kpc are found to be generally lower than those interior, but there is also a diminishing trend of the dispersion as we exclude nearby events. We do not find that SN~Ia average luminosity varies significantly when they are grouped in various host morphological types. Host galaxy data from this work will be useful, in conjunction with future high-redshift samples, in constraining cosmological parameters.