Cosmology with AGN dust time lags-simulating the new VEILS survey
Cosmology with AGN dust time lags-simulating the new VEILS survey
复制标题
具有 AGN 尘埃时滞的宇宙学——模拟新的 VEILS 巡天
DOI：
10.1093/mnras/stw2484
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发表时间：
2017
影响因子：
4.8
通讯作者：
Hönig S
中科院分区：
文献类型：
--
作者：
Hönig S
活动星系核(AGN)的光学和近红外连续发射之间的时间滞后与光度密切相关，被认为是宇宙学中可标准化的烛光。在本文中，我们探索了在新的Vista河外红外遗产调查(VEILS)的约束下，利用这些活动星系核热尘时滞来进行宇宙学模型拟合。这项新调查的目标是在JandKsband观测到的9度磁场，节奏为14-d，将持续3年。暗能量调查将同时在光学条纹中覆盖同一区域，提供补充的时间域光学数据。我们对测量设置进行了逼真的模拟，显示我们预计将恢复总共1350个第一类活动星系核中约450个物体的尘埃时间滞后，红移范围为0.1；z<；1.2。我们使用从模拟中恢复的滞后来计算精确的距离模数，建立哈勃图，并对宇宙学模型进行拟合。假设活动星系核周围的尘埃分布以及滞后光度关系的归一化中存在真实的散射，我们能够以与当前超新星样本类似的精度约束Λ清洁发展机制。我们讨论了活动星系核和超新星结合在宇宙学上的好处，并将目前的工作与未来尝试接触到Z>；4的红移联系起来。
The time lag between optical and near-infrared continuum emission in active galactic nuclei (AGN) shows a tight correlation with luminosity and has been proposed as a standardizable candle for cosmology. In this paper, we explore the use of these AGN hot-dust time lags for cosmological model fitting under the constraints of the new VISTA Extragalactic Infrared Legacy Survey (VEILS). This new survey will target a 9 deg2field observed inJandKsband with a 14-d cadence and will run for 3 yr. The same area will be covered simultaneously in the opticalgrizbands by the Dark Energy Survey, providing complementary time-domain optical data. We perform realistic simulations of the survey setup, showing that we expect to recover dust time lags for about 450 objects out of a total of 1350 optical type 1 AGN, spanning a redshift range of 0.1 <z< 1.2. We use the lags recovered from our simulations to calculate precise distance moduli, establish a Hubble diagram, and fit cosmological models. Assuming realistic scatter in the distribution of the dust around the AGN as well as in the normalization of the lag–luminosity relation, we are able to constrainin ΛCDM with similar accuracy as current supernova samples. We discuss the benefits of combining AGN and supernovae for cosmology and connect the present work to future attempts to reach out to redshifts ofz> 4.