The Carnegie Supernova Project-I: Correlation between Type Ia Supernovae and Their Host Galaxies from Optical to Near-infrared Bands
The Carnegie Supernova Project-I: Correlation between Type Ia Supernovae and Their Host Galaxies from Optical to Near-infrared Bands
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DOI：
10.3847/1538-4357/abafb7
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发表时间：
2020-06
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通讯作者：
S. Uddin;C. Burns;M. Phillips;N. Suntzeff;C. Contreras;E. Hsiao;N. Morrell;L. Galbany;M. Stritzinger;P. Hoeflich;C. Ashall;A. Piro;W. Freedman;S. E. Persson;K. Krisciunas;P. Brown
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作者：
S. Uddin;C. Burns;M. Phillips;N. Suntzeff;C. Contreras;E. Hsiao;N. Morrell;L. Galbany;M. Stritzinger;P. Hoeflich;C. Ashall;A. Piro;W. Freedman;S. E. Persson;K. Krisciunas;P. Brown
本文介绍了卡内基超新星计划I观测到的Ia型超新星的宿主星系的光学和近红外测光。我们确定宿主星系的恒星质量，并首次研究它们与Ia超新星标准化光度在光学和近红外（uBgVriYJH）波段的相关性。在单个的带中，我们发现Ia超新星在质量更大的宿主中更明亮，光变曲线标准化后的光度偏移范围在−0.07 ± 0.03和−0.15 ± 0.04等之间。超新星Ia的哈勃剩余质量与宿主质量关系的斜率在所有的uBgVriYJH波段都是负的，其值在−0.029 ± 0.029和−0.093 ± 0.031等dex−1之间，这意味着超新星Ia在更大质量的星系中比预期的要亮。在光学和近红外波段上观测到的接近恒定的相关性表明，尘埃在观测到的光度偏移-宿主质量相关性中可能没有发挥重要作用。我们测量了超新星Ia和它们的宿主中心之间的预计间隔，发现超新星Ia爆炸超过预计的10千秒差距，在所有波段的哈勃残差中的色散减少了50%- 60%，使它们成为超新星Ia的一个更均匀的子集。宿主星系中的尘埃、附近超新星Ia的特殊速度或两者的组合可能会导致这一结果，因为超过10千秒差距的超新星Ia的颜色过度通常低于内部的颜色过度，但也有一个减少的趋势。当我们排除附近的事件时。我们没有发现，SN Ia平均光度变化显着时，他们被分组在不同的主机形态类型。从这项工作的宿主星系数据将是有用的，结合未来的高红移样本，在约束宇宙学参数。
We present optical and near-infrared (NIR) (ugriYJH) photometry of host galaxies of Type Ia supernovae (SN Ia) observed by the 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 NIR (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 ± 0.03 and −0.15 ± 0.04 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 −0.029 ± 0.029 and −0.093 ± 0.031 mag dex−1—implying that SNe Ia in more massive galaxies are brighter than expected. The near-constant observed correlations across optical and NIR 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 50%– 60% 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.