Science with the 2.5-meter Wide Field Survey Telescope (WFST)

Wang, Tinggui; Liu, Guilin; Cai, Zhenyi; Geng, Jinjun; Fang, Min; He, Haoning; Jiang, Ji-an; Jiang, Ning; Kong, Xu; Li, Bin; Li, Ye; Luo, Wentao; Pan, Zhizheng; Wu, Xuefeng; Yang, Ji; Yu, Jiming; Zheng, Xianzhong; Zhu, Qingfeng; Cai, Yi-Fu; Chen, Yuanyuan; Chen, Zhiwei; Dai, Zigao; Fan, Lulu; Fan, Yizhong; Fang, Wenjuan; He, Zhicheng; Hu, Lei; Hu, Maokai; Jin, Zhiping; Jiang, Zhibo; Li, Guoliang; Li, Fan; Li, Xuzhi; Liang, Runduo; Lin, Zheyu; Liu, Qingzhong; Liu, Wenhao; Liu, Zhengyan; Liu, Wei; Liu, Yao; Lou, Zheng; Qu, Han; Sheng, Zhenfeng; Shi, Jianchun; Shu, Yiping; Su, Zhenbo; Sun, Tianrui; Wang, Hongchi; Wang, Huiyuan; Wang, Jian; Wang, Junxian; Wei, Daming; Wei, Junjie; Xue, Yongquan; Yan, Jingzhi; Yang, Chao; Yuan, Ye; Yuan, Yefei; Zhang, Hongxin; Zhang, Miaomiao; Zhao, Haibin; Zhao, Wen

doi:10.1007/s11433-023-2197-5

Cited by 42 publications

(24 citation statements)

References 264 publications

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“…Then we address how long a baseline is necessary in order to determine the DRW parameters for a single AGN down to a desired accuracy. Finally, time-domain surveys to be conducted by the WFST (Wang et al 2023a) are briefly introduced and the role of the WFST surveys in improving constraints on the DRW parameters is highlighted.…”

Section: Discussionmentioning

confidence: 99%

“…For comparison, the well-known SDSS Stripe 82 (S82) is mapped eight times on average in a 2-3 months duration per year and the average cadence is about 6 to 7 days (MacLeod et al 2010), while a 3 days cadence is reached by the subsequent time-domain surveys, such as Pan-STARRS1 (PS1; only in the median deep fields; Chambers et al 2016) and ZTF (Masci et al 2019). The upcoming deep drilling fields of LSST will have a 2 days cadence (Brandt et al 2018), and a 1 day cadence is proposed for the deep high-cadence survey of WFST (Wang et al 2023a).…”

Section: Season Gapsmentioning

confidence: 99%

“…Brief introductions to the WFST surveys and the relevant AGN sciences are presented in the following, while readers are referred to the WFST white paper for a panchromatic view (Wang et al 2023a). The 2.5 m WFST with a field of view of 6.5 deg 2 is designated to quickly survey the northern sky in four optical bands (u, g, r, and i).…”

Section: Survey Strategy Of Wfstmentioning

confidence: 99%

“…Therefore, to exhaustively explore the effects of all these selections and the origin of the aforementioned confusing conclusions, in this work we revisit the baseline required to accurately retrieve τ in , by comparing different priors and estimators in Section 2. The effects of photometric uncertainty, the sampling cadence, and season gaps on retrieving the DRW parameters are considered in Section 3, before we highlight the role of the 2.5 m Wide Field Survey Telescope (WFST; Wang et al 2023a) in confining the variation properties of AGNs. Finally, a brief summary is presented in Section 4.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

How Can the Optical Variation Properties of Active Galactic Nuclei Be Unbiasedly Measured?

Hu,

Cai,

Wang

2024

ApJ

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The variability of active galactic nuclei (AGNs) is ubiquitous, but has not yet been understood. Measuring the optical variation properties of AGNs, such as the variation timescale and amplitude, and then correlating them with their fundamental physical parameters has long served as a critical way of exploring the origin of AGN variability and the associated physics of the accretion process in AGNs. Obtaining accurate variation properties of AGNs is thus essential. It has been found that the damped random walk process can describe the AGN optical variation well, but there is a controversy over how long a minimal monitoring baseline is required to obtain unbiased variation properties. In this work, we settle the controversy by exhaustively scrutinizing the complex combination of assumed priors, adopted best-fit values, ensemble averaging methods, and fitting methods. The new proposal is then an optimized solution where unbiased variation properties of an AGN sample possessing the same variation timescale can be obtained with a minimal baseline of about 10 times their variation timescale. Finally, the new optimized solution is used to demonstrate the positive role of the time-domain surveys to be conducted by the Wide Field Survey Telescope in improving constraints on AGN variation properties.

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Section: Discussionmentioning

confidence: 99%

Section: Season Gapsmentioning

confidence: 99%

Section: Survey Strategy Of Wfstmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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How Can the Optical Variation Properties of Active Galactic Nuclei Be Unbiasedly Measured?

Hu,

Cai,

Wang

2024

ApJ

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“…The matter fallback rate and the light curve theoretically follow t −5/3 over timescales of months to years, which is a typical feature for TDEs (Rees 1988). In the past few years, more than 100 TDE candidates have been reported (e.g., French et al 2020b;Hammerstein et al 2023;Yao et al 2023) and the number will dramatically increase due to current and upcoming multiband time-domain surveys (Rau et al 2009;Merloni et al 2012;Shappee et al 2014;Chambers et al 2016;Bellm et al 2019;Ivezić 2019;Lin et al 2022;Wang et al 2023b).…”

Section: Introductionmentioning

confidence: 99%

An Explanation for the Overrepresentation of Tidal Disruption Events in Post-starburst Galaxies

Wang,

Ma,

et al. 2023

ApJ

Self Cite

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Tidal disruption events (TDEs) provide a valuable probe for studying the dynamics of stars in the nuclear environments of galaxies. Recent observations show that TDEs are strongly overrepresented in post-starburst or “green valley” galaxies, although the underlying physical mechanism remains unclear. Considering the possible interaction between stars and active galactic nucleus (AGN) disks, the TDE rates can be greatly changed compared to those in quiescent galactic nuclei. In this work, we revisit TDE rates by incorporating an evolving AGN disk within the framework of “loss cone” theory. We numerically evolve the Fokker–Planck equations by considering star–disk interactions, in situ star formation in the unstable region of the outer AGN disk, and evolution of the accretion process of supermassive black holes. We find that the TDE rates are enhanced by about 2 orders of magnitude shortly after the AGN transitions into an inactive stage. During this phase, the accumulated stars rapidly scatter into the loss cone due to the disappearance of the inner standard thin disk. Our results provide an explanation for the overrepresentation of TDEs in post-starburst galaxies.

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Black holes as the source of dark energy: A stringent test with high-redshift JWST AGNs

Lei,

Zu,

Yuan

et al. 2024

Sci. China Phys. Mech. Astron.

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Science with the 2.5-meter Wide Field Survey Telescope (WFST)

Cited by 42 publications

References 264 publications

How Can the Optical Variation Properties of Active Galactic Nuclei Be Unbiasedly Measured?

How Can the Optical Variation Properties of Active Galactic Nuclei Be Unbiasedly Measured?

An Explanation for the Overrepresentation of Tidal Disruption Events in Post-starburst Galaxies

Black holes as the source of dark energy: A stringent test with high-redshift JWST AGNs

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