Publications (37)
Evidence for Photoionization Driven Broad Absorption Line Variability
Tinggui Wang, Chenwei Yang, Huiyuan Wang +1
We present a qualitative analysis of the variability of quasar broad absorption lines using the large multi-epoch spectroscopic dataset of the Sloan Digital Sky Survey Data Release…
Fast Inflow Directly Feeding Black Hole Accretion Disk in Quasars
Hongyan Zhou, Xiheng Shi, Weimin Yuan +21
Quasars are high-luminosity active galactic nuclei believed to be powered by accretion of interstellar matter onto a super-massive black hole (SMBH) therein. Most of the observed e…
Line-force driven wind from a thin disk in tidal disruption event
De-Fu Bu, Xiao-Hong Yang, Liang Chen +2
Winds from the accretion disk in tidal disruption events (TDEs) play a key role in determining the radiation of TDEs. The winds from the super-Eddington accretion phase in TDEs hav…
Leaked Lya emission: an indicator of the size of quasar absorption outflows
Zhicheng He, Guilin Liu, Tinggui Wang +2
The galactocentric distance of quasar absorption outflows are conventionally determined using absorption troughs from excited states, a method hindered by severely saturated or sel…
A Mid-infrared Flare in the Active Galaxy MCG-02-04-026: Dust Echo of a Nuclear Transient Event
Luming Sun, Ning Jiang, Tinggui Wang +8
We report the discovery of a mid-infrared (MIR) flare using WISE data in the center of the nearby Seyfert 1.9 galaxy MCG-02-04-026. The MIR flare began in the first half of 2014, p…
Long Term Spectral Evolution of Tidal Disruption Candidates Selected by Strong Coronal Lines
Chenwei Yang, Tinggui Wang, Gary Ferland +3
We present results of follow-up optical spectroscopic observations of seven rare, extreme coronal line emitting galaxies reported by Wang et al. (2012) with Multi-Mirror Telescope…
Mid-InfraRed Outburst in Nearby Galaxies (MIRONG) I: Sample Selection and Characterization
Ning Jiang, Tinggui Wang, Liming Dou +9
The optical time-domain astronomy has grown rapidly in the past decade but the dynamic infrared sky is rarely explored. Aiming to construct a sample of mid-infrared outburst in nea…
Mid-infrared flare of TDE candidate PS16dtm: dust echo and implications for the spectral evolution
Ning Jiang, Tinggui Wang, Lin Yan +6
PS16dtm was classified as a candidate tidal disruption event (TDE) in a dwarf Seyfert 1 galaxy with low-mass black hole () and has presented various intriguing phot…
Rapid "Turn-on" of type 1 AGN in a quiescent early type galaxy SDSS1115+0544
Lin Yan, Tinggui Wang, Jiang Ning +8
We present a detailed study of a transient in the center of SDSS1115+0544 based on the extensive UV, optical, mid-IR light curves (LC) and spectra over 1200 days. The host galaxy i…
Numerical Study on Outflows in Seyfert Galaxies I: Narrow Line Region Outflows in NGC 4151
Guobin Mou, Tinggui Wang, Chenwei Yang
The origin of narrow line region (NLR) outflows remains unknown. In this paper, we explore the scenario in which these outflows are circumnuclear clouds driven by energetic accreti…
Extreme Coronal Line Emitters: Tidal Disruption of Stars by Massive Black Holes in Galactic Nuclei?
Tinggui Wang, Hongyan Zhou, S. Komossa +3
Tidal disruption of stars by supermassive black holes at the centers of galaxies is expected to produce unique emission line signatures, which have not yet been explored adequately…
Discovery of a Damped Ly Absorber in the Circumnuclear Zone of the FeLoBAL Quasar SDSS J083942.11+380526.3
Shengmiao Wu, Xiheng Shi, Nibedita Kalita +8
SDSS J083942.11+380526.3 () is a FeLoBAL quasar that exhibits visible Balmer absorption lines (H), implying a significant population. The quasar also shows an ar…
Beyond Camera Motion Blur Removing: How to Handle Outliers in Deblurring
Meng Chang, Chenwei Yang, Huajun Feng +2
Camera motion deblurring is an important low-level vision task for achieving better imaging quality. When a scene has outliers such as saturated pixels, the captured blurred image…
Unshifted Metastable He I* Mini-Broad Absorption Line System in the Narrow Line Type 1 Quasar SDSS J080248.18551328.9
Tuo Ji, Hongyan Zhou, Peng Jiang +11
We report the identification of an unusual absorption line system in the quasar SDSS J080248.18551328.9 and present a detailed study of the system, incorporating follow-up optic…
Mid-InfraRed Outbursts in Nearby Galaxies (MIRONG). II. Optical Spectroscopic Follow-up
Yibo Wang, Ning Jiang, Tinggui Wang +8
Infrared echo has proven to be an effective means to discover transient accretion events of supermassive black holes (SMBHs), such as tidal disruption events (TDEs) and changing-lo…
The physical constraints on a new LoBAL QSO at z=4.82
Weimin Yi, Richard Green, Jin-Ming Bai +26
Very few low-ionization broad absorption line (LoBAL) QSOs have been found at high redshifts to date. One high-redshift LoBAL QSO, J0122+1216, was recently discovered at the Lijian…
High Performance Space Debris Tracking in Complex Skylight Backgrounds with a Large-Scale Dataset
Guohang Zhuang, Weixi Song, Jinyang Huang +3
With the rapid development of space exploration, space debris has attracted more attention due to its potential extreme threat, leading to the need for real-time and accurate debri…
Mid-infrared variability of changing-look AGN
Zhenfeng Sheng, Tinggui Wang, Ning Jiang +4
It is known that some active galactic nuclei (AGNs) transited from type 1 to type 2 or vice versa. There are two explanations for the so-called changing look AGNs: one is the drama…
Discovery of a years-delayed radio flare from an unusually slow-evolved tidal disruption event
Zhumao Zhang, Xinwen Shu, Lei Yang +19
SDSS J1115+0544 is a unique low-ionization nuclear emission-line region (LINER) galaxy with energetic ultraviolet (UV), optical and mid-infrared outbursts occurring in its nucleus.…
Photoionization-driven Absorption Lines Variability in Balmer Absorption Line Quasar LBQS 1206+1052
Luming Sun, Hongyan Zhou, Tuo Ji +10
In this paper we present an analysis of absorption line variability in mini-BAL quasar LBQS 1206+1052. The SDSS spectrum demonstrates that the absorption troughs can be divided int…
Long Fading Mid-Infrared Emission in Transient Coronal Line Emitters: Dust Echo of Tidal Disruption Flare
Liming Dou, Ting-gui Wang, Ning Jiang +3
The sporadic accretion following the tidal disruption of a star by a super-massive black hole (TDE) leads to a bright UV and soft X-ray flare in the galactic nucleus. The gas and d…
Initial results from a systematic search for changing-look active galactic nuclei selected via mid-infrared variability
Zhenfeng Sheng, Tinggui Wang, Ning Jiang +6
Changing look active-galatic-nuclei (CL AGNs) can yield considerable insight into accretion physics as well as the co-evolution of black holes and their host galaxies. A large samp…
Antarctic TianMu Staring Observation Project I: Overview and Implementation of the Prototype Telescope
Dan Zhou, Jing Zhong, Jianchun Shi +31
Wide-field rapid sky surveys serve as critical observational methods for time-domain astronomical research. The Antarctic region, with several months of continuous dark nights annu…
Discovery of An Active Intermediate-Mass Black Hole Candidate in the Barred Bulgeless Galaxy NGC 3319
Ning Jiang, Tinggui Wang, Hongyan Zhou +7
We report the discovery of an active intermediate-mass black hole (IMBH) candidate in the center of nearby barred bulgeless galaxy . The point X-ray source revealed b…
Evidence of a tidal disruption event in GSN 069 from the abnormal carbon and nitrogen abundance ratio
Zhenfeng Sheng, Tinggui Wang, Gary Ferland +4
GSN 069 is an ultra-soft X-ray active galactic nucleus that previously exhibited a huge X-ray outburst and a subsequent long-term decay. It has recently presented X-ray quasi-perio…
Carbon and Nitrogen Abundance Ratio In the Broad Line Region of Tidal Disruption Events
Chenwei Yang, Tinggui Wang, Gary J. Ferland +4
The rest-frame UV spectra of three recent tidal disruption events (TDEs), ASASSN-14li, PTF15af and iPTF16fnl display strong nitrogen emission lines but weak or undetectable carbon…
Long-Term Decline of the Mid-Infrared Emission of Normal Galaxies: Dust Echo of Tidal Disruption Flare?
Tinggui Wang, Lin Yan, Liming Dou +3
We report the discovery of a sample of 19 low redshift (z<0.22) spectroscopically non-Seyfert galaxies that show slow declining mid-infrared (MIR) light-curves (LCs), similar to th…
Mrk 1239: a Type-2 Counterpart of Narrow-line Seyfert-1?
Xiang Pan, Hongyan Zhou, Chenwei Yang +10
We present new spectrophotometric and spectropolarimetric observations of Mrk 1239, one of the 8 prototypes that defines type-1 narrow-line Seyfert galaxies (NLS1s). Unlike the oth…
X-ray spectral shape variations in changing-look Seyfert galaxy SDSSJ155258+273728
Yanli Ai, Liming Dou, Chenwei Yang +7
We analyze the X-ray, optical, and mid-infrared data of a "changing-look" Seyfert galaxy \sdssj15 at . Over a period of one decade (2009 - 2018), its broad H line…
Discovery of a Mid-infrared Echo from the TDE candidate in the nucleus of ULIRG F01004-2237
Liming Dou, Tinggui Wang, Lin Yan +5
We present the mid-infrared (MIR) light curves (LCs) of a tidal disruption event (TDE) candidate in the center of a nearby ultraluminous infrared galaxy (ULIRG) F01004-2237 using a…
The WISE Detection of an Infrared Echo in Tidal Disruption Event ASASSN-14li
Ning Jiang, Liming Dou, Tinggui Wang +3
We report the detection of a significant infrared variability of the nearest tidal disruption event (TDE) ASASSN-14li using Wide-field Infrared Survey Explorer} and newly released…
Variation of ionizing continuum: the main driver of Broad Absorption Line Variability
Zhicheng He, Tinggui Wang, Hongyan Zhou +5
We present a statistical analysis of the variability of broad absorption lines (BALs) in quasars using the large multi-epoch spectroscopic dataset of the Sloan Digital Sky Survey D…
A Comprehensive Study of Broad Absorption Line Quasars: I. Prevalence of HeI* Absorption Line Multiplets in Low-Ionization Objects
Wen-Juan Liu, Hongyan Zhou, Tuo Ji +13
Neutral Helium multiplets, HeI*3189,3889,10830 are very useful diagnostics to the geometry and physical conditions of the absorbing gas in quasars. So far only a handful of HeI* de…
Evidence for Fluorescent Fe II Emission from Extended Low Ionization Outflows in Obscured Quasars
Tinggui Wang, Gary Ferland, Chenwei Yang +2
Recent studies have shown that outflows in at least some broad absorption line (BAL) quasars are extended well beyond the putative dusty torus. Such outflows should be detectable i…
On the Origin of the Strong Optical Variability of Emission-line Galaxies
Ruqiu Lin, Zhen-Ya Zheng, Weida Hu +9
Emission-line galaxies (ELGs) are crucial in understanding the formation and evolution of galaxies, while little is known about their variability. Here we report the study on the o…
A Deeply Buried Narrow-Line Seyfert 1 Nucleus Uncovered in Scattered Light
Xiang Pan, Honglin Lu, S. Komossa +13
We present spectropolarimetric and spectrophotometric observations of the peculiar active galactic nucleus (AGN) SDSS J120300.19+162443.7 (hereafter J1203+1624) at . Its…
Dust-obscured radio-emitting tidal disruption event coincident with a high-energy neutrino event
Tianyao Zhou, Xinwen Shu, Guobin Mou +14
Despite the growing number of high-energy neutrinos (TeV-PeV) detected by IceCube, their astrophysical origins remain largely unidentified. Recent observations have linked a few ti…