First cosmology results using type Ia supernovae from the Dark Energy Survey: the effect of host galaxy properties on supernova luminosity-猫眼课题宝

DOI：

10.1093/mnras/staa946

发表时间：

2020-01

期刊：

Monthly Notices of the Royal Astronomical Society

影响因子：

4.8

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

M. Smith;M. Sullivan;P. Wiseman;R. Kessler;D. Scolnic;D. Brout;C. D'Andrea;T. Davis;R. Foley;C. Frohmaier;L. Galbany;R. Gupta;C. Guti'errez;S. Hinton;L. Kelsey;C. Lidman;E. MacAulay;A. Moller;R. Nichol;P. Nugent;A. Palmese;M. Pursiainen;M. Sako;R. Thomas;B. Tucker;D. Carollo;G. Lewis;N. E. Sommer;T. Abbott;M. Aguena;S. Allam;S. Ávila;E. Bertin;S. Bhargava;D. Brooks;E. Buckley-Geer;D. Burke;A. Rosell;M. Kind;M. Costanzi;L. Costa;J. Vicente;S. Desai;H. Diehl;P. Doel;T. Eifler;S. Everett;B. Flaugher;P. Fosalba;J. Frieman;J. Garc'ia-Bellido;E. Gaztañaga;K. Glazebrook;D. Gruen;R. Gruendl;J. Gschwend;G. Gutiérrez;W. Hartley;D. Hollowood;K. Honscheid;D. James;E. Krause;K. Kuehn;N. Kuropatkin;M. Lima;N. MacCrann;M. Maia;J. Marshall;P. Martini;Peter Melchior;F. Menanteau;R. Miquel;F. Paz-Chinch'on;A. Plazas;A. Romer;A. Roodman;E. Rykoff;E. Sánchez;V. Scarpine;M. Schubnell;S. Serrano;I. Sevilla-Noarbe;E. Suchyta;M. Swanson;G. Tarlé;D. Thomas;D. Tucker;T. Varga;A. R. W. T. D. E. S. Collaboration

我们提出了改进的光度测量的206光谱证实的Ia型超新星的暗能量调查超新星计划（DES-SN）发现的宿主星系，并在第一次DES-SN宇宙学分析中使用。对于DES-SN样本，当考虑5D（z，x1，c，α，β）偏差校正，我们发现了哈勃残余“质量台阶”的证据，其中，高质量星系（> 1010 M <$）中的Ia超新星本质上更明亮（校正后）比低质量对应物高$\gamma =0.040\pm 0.019$ mag.这个值比第一次DES中发现的值大0.031 mag-SN宇宙学分析。这种差异是由于更新的光度测量和改进的星星形成历史的结合，而不是从主星系的错误识别。当使用1D（仅红移）偏差校正时，推断的质量阶跃较大，$\gamma =0.066\pm 0.020$mag. DES-SN的1D−5D γ差为0.026\pm 0.009$mag. We表明，这种差异是由于宿主星系恒星质量和5D距离偏差校正的x1分量之间的强相关性。包括观测到的Ia超新星的性质、拉伸和颜色以及模拟的Ia超新星样本中的恒星质量之间的内在相关性，我们表明，与一维拟合的+2 mmag偏差相比，5D拟合可以在−9 mmag偏差下恢复γ。这种差异可以解释数据中出现的部分差异。当我们进入LSST时代时，有必要改进星系属性和SN之间的相关性建模，以确保暗能量状态方程的无偏精确估计。

We present improved photometric measurements for the host galaxies of 206 spectroscopically confirmed type Ia supernovae discovered by the Dark Energy Survey Supernova Program (DES-SN) and used in the first DES-SN cosmological analysis. For the DES-SN sample, when considering a 5D (z, x1, c, α, β) bias correction, we find evidence of a Hubble residual ‘mass step’, where SNe Ia in high-mass galaxies (>1010M⊙) are intrinsically more luminous (after correction) than their low-mass counterparts by $\gamma =0.040\pm 0.019$ mag. This value is larger by 0.031 mag than the value found in the first DES-SN cosmological analysis. This difference is due to a combination of updated photometric measurements and improved star formation histories and is not from host-galaxy misidentification. When using a 1D (redshift-only) bias correction the inferred mass step is larger, with $\gamma =0.066\pm 0.020$ mag. The 1D−5D γ difference for DES-SN is $0.026\pm 0.009$ mag. We show that this difference is due to a strong correlation between host galaxy stellar mass and the x1 component of the 5D distance-bias correction. Including an intrinsic correlation between the observed properties of SNe Ia, stretch and colour, and stellar mass in simulated SN Ia samples, we show that a 5D fit recovers γ with −9 mmag bias compared to a +2 mmag bias for a 1D fit. This difference can explain part of the discrepancy seen in the data. Improvements in modelling correlations between galaxy properties and SN is necessary to ensure unbiased precision estimates of the dark energy equation of state as we enter the era of LSST.

First cosmology results using type Ia supernovae from the Dark Energy Survey: the effect of host galaxy properties on supernova luminosity

文献摘要

被引文献

相似文献