arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.12101astro-ph.COastro-ph.GA
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环境对暗能量巡天三年宇宙学样本中Ia型超新星的影响

The Effect of Environment on Type Ia Supernovae in the Dark Energy Survey Three-Year Cosmological Sample

L. Kelsey, M. Sullivan, M. Smith, P. Wiseman, D. Brout, T. M. Davis, C. Frohmaier, L. Galbany, M. Grayling, C. P. Gutiérrez, S. R. Hinton, R. Kessler, C. Lidman… 展开作者

L. Kelsey, M. Sullivan, M. Smith, P. Wiseman, D. Brout, T. M. Davis, C. Frohmaier, L. Galbany, M. Grayling, C. P. Gutiérrez, S. R. Hinton, R. Kessler, C. Lidman, A. Möller, M. Sako, D. Scolnic, S. A. Uddin, M. Vincenzi, T. M. C. Abbott, M. Aguena, S. Allam, J. Annis, S. Avila, D. Bacon, E. Bertin, D. Brooks, D. L. Burke, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, F. J. Castander, M. Costanzi, L. N. da Costa, S. Desai, H. T. Diehl, P. Doel, S. Everett, I. Ferrero, A. Ferté, B. Flaugher, P. Fosalba, J. García-Bellido, D. W. Gerdes, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, D. L. Hollowood, K. Honscheid, D. J. James, A. G. Kim, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, J. L. Marshall, P. Martini, F. Menanteau, R. Miquel, R. Morgan, R. L. C. Ogando, A. Palmese, F. Paz-Chinchón, A. A. Plazas, A. K. Romer, C. Sánchez, E. Sanchez, S. Serrano, I. Sevilla-Noarbe, E. Suchyta, G. Tarle, D. Thomas, C. To, T. N. Varga, A. R. Walker, R. D. Wilkinson

摘要:

对Ia型超新星(SNe Ia)的分析发现,它们的标准化光度与宿主星系性质之间存在令人困惑的相关性:高质量、被动宿主中的SNe Ia似乎比低质量、恒星形成宿主中的更亮。我们研究了在暗能量调查三年光谱确认的宇宙学样本的超新星Ia的宿主星系,获得测光在一系列的“本地”光圈集中的SN,并为全球的宿主星系。我们研究了这些宿主星系属性的差异,如恒星质量和静止坐标系$U-R$颜色,以及它们与超新星Ia参数(包括哈勃残差)的相关性。我们发现所有哈勃残差步骤是$>3σ$的意义,无论是在传统的环境属性样本中位数分裂和步骤的最大意义。对于恒星质量,我们发现一个最大的本地步骤的$0.098\pm0.018$等; $\sim 0.03$等大于最大的全球恒星质量的步骤在我们的样本($0.070 \pm 0.017$等)。当在样本中值处分裂时,局部和全局$U-R$阶跃之间的差异很小,都是$\sim 0.08$等,但比全局恒星质量阶跃($0.057\pm0.017$等)更显著。我们根据Ia超新星光变曲线参数将数据分为子样本:拉伸(PDMATHAMT)和颜色($c$),发现红色物体($c > 0$)有较大的哈勃残差步骤,恒星质量和$U-R$,无论是本地和全球的测量,$\sim0.14$。此外,蓝(恒星形成)局部环境拥有更均匀的SN Ia样本,具有局部$U-R$ r.m.s.在局部蓝色$U-R$环境中,蓝色($c < 0$)SNe Ia的散射低至$0.084 \pm 0.017$ mag。

英文摘要:

Analyses of type Ia supernovae (SNe Ia) have found puzzling correlations between their standardised luminosities and host galaxy properties: SNe Ia in high-mass, passive hosts appear brighter than those in lower-mass, star-forming hosts. We examine the host galaxies of SNe Ia in the Dark Energy Survey three-year spectroscopically-confirmed cosmological sample, obtaining photometry in a series of "local" apertures centred on the SN, and for the global host galaxy. We study the differences in these host galaxy properties, such as stellar mass and rest-frame $U-R$ colours, and their correlations with SN Ia parameters including Hubble residuals. We find all Hubble residual steps to be $>3σ$ in significance, both for splitting at the traditional environmental property sample median and for the step of maximum significance. For stellar mass, we find a maximal local step of $0.098\pm0.018$ mag; $\sim 0.03$ mag greater than the largest global stellar mass step in our sample ($0.070 \pm 0.017$ mag). When splitting at the sample median, differences between local and global $U-R$ steps are small, both $\sim 0.08$ mag, but are more significant than the global stellar mass step ($0.057\pm0.017$ mag). We split the data into sub-samples based on SN Ia light curve parameters: stretch ($x_1$) and colour ($c$), finding that redder objects ($c > 0$) have larger Hubble residual steps, for both stellar mass and $U-R$, for both local and global measurements, of $\sim0.14$ mag. Additionally, the bluer (star-forming) local environments host a more homogeneous SN Ia sample, with local $U-R$ r.m.s. scatter as low as $0.084 \pm 0.017$ mag for blue ($c < 0$) SNe Ia in locally blue $U-R$ environments.

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