117 citations · 676 across the 33 of their papers we have counts for
29 papers · 1 filter
Spiraling into the `snail' cluster MCXC J0157.4-0550
Chao Geng, Chong Ge, Ming Sun +8
We present a deep Chandra (130 ks) study of a striking, tidally induced cold front in a subcluster merging with the galaxy cluster MCXC J0157.4-0550. The subcluster, nicknamed the…
The Transition from Galaxy-wide Gas Inflow to Outflow in Quasar Host Galaxies
Zhicheng He, Zhifu Chen, Guilin Liu +8
Galactic-wide outflows driven by active galactic nuclei (AGNs) is a routinely invoked feedback mechanism in galaxy evolution models. Hitherto, the interplay among the interstellar…
Quasar winds caught on acceleration and deceleration
Weimin Yi, P. B. Hall, Zunlin Yuan +5
We present an observational study of wind acceleration based on four low-ionization broad absorption line (LoBAL) quasars (J0136, J1238, J1259, J1344). J0136 and J1344 (group-1) ar…
Discovery of the Asymmetric Effect in the Response of Photoionization Gas
Zhicheng He, Tinggui Wang
The variability of quasar radiation provides a powerful probe of the photoionization response of ionized gas, which plays a central role in tracing cosmic evolution and plasma phys…
Discovery of spectacular quasar-driven superbubbles in red quasars
Lu Shen, Guilin Liu, Zhicheng He +7
Quasar-driven outflows on galactic scales are a routinely invoked ingredient for galaxy formation models. We report the discovery of ionized gas nebulae as traced by [O III] 500…
Investigation of Stellar Kinematics and Ionized gas Outflows in Local (U)LIRGs
Ashraf Ayubinia, Yongquan Xue, Huynh Anh Nguyen Le +4
We explore properties of stellar kinematics and ionized gas in a sample of 1106 local (U)LIRGs from the AKARI telescope. We combine data from $Wide-field\ Infrared\ Survey\ Explore…
Asymmetric eROSITA bubbles as the evidence of a circumgalactic medium wind
Guobin Mou, Dongze Sun, Taotao Fang +6
The eROSITA bubbles are detected via the instrument with the same name. The northern bubble shows noticeable asymmetric features, including distortion to the west and enhancement i…
Exploring the Fundamental Mechanism in Driving Highest-velocity Ionized Outflows in Radio AGNs
Ashraf Ayubinia, Yongquan Xue, Jong-Hak Woo +4
We investigate the ionized gas kinematics relationship with X-ray, radio and accreting properties using a sample of 348 nearby () SDSS-FIRST-X-ray detected AGNs. X-ray pro…
Evidence for quasar fast outflows being accelerated at the scale of tens of parsecs
Zhicheng He, Guilin Liu, Tinggui Wang +14
Quasar outflows may play a crucial role in regulating the host galaxy, although the spatial scale of quasar outflows remain a major enigma, with their acceleration mechanism poorly…
A quasar shedding its dust cocoon at redshift 2
Weimin Yi, W. N. Brandt, Q. Ni +12
We present the first near-IR spectroscopy and joint analyses of multi-wavelength observations for SDSS J082747.14+425241.1, a dust-reddened, weak broad emission-line quasar (WLQ) u…
Evidence for the connection between star formation rate and evolutionary phases of quasars
Zhifu Chen, Zhicheng He, Luis C. Ho +5
Both theory and observations suggest that outflows driven by an active central supermassive black hole (SMBH) has a feedback effect on shaping the global properties of the host gal…
The detections of inflowing gas from narrow absorption lines at the parsec scale
Zhi-Fu Chen, Minfeng Gu, Zhicheng He +4
Inflows at the dusty torus and smaller scales is crucial to investigate the process of supermassive black hole accretion. However, only few cases of inflowing gas at small scales h…
Transient obscuration event captured in NGC~3227 II. Warm absorbers and obscuration events in archival XMM-Newton and NuSTAR observations
Yijun Wang, Jelle Kaastra, Missagh Mehdipour +18
The relation between warm absorber (WA) outflows of AGN and nuclear obscuration activities caused by optically-thick clouds (obscurers) crossing the line of sight is unclear. NGC 3…
The Deviation of the Broad-line Region Size Between Reverberation Mapping and Spectroastrometry
Xiaer Zhang, Zhicheng He, Tinggui Wang +1
The combination of the linear size from reverberation mapping (RM) and the angular distance of the broad line region (BLR) from spectroastrometry (SA) in active galactic nuclei (AG…
A sharp rise in the detection rate of broad absorption line variations in a quasar SDSS J141955.26+522741.1
Qinyuan Zhao, Zhicheng He, Guilin Liu +4
We present an analysis of the variability of broad absorption lines (BALs) in a quasar SDSS J141955.26+522741.1 at with 72 observations from the Sloan Digital Sky Survey…
An Extraordinary Response of Iron Emission to the Central Outburst in a Tidal Disruption Event Candidate
Zhicheng He, Ning Jiang, Tinggui Wang +9
Understanding the origin of \feii\ emission is important because it is crucial to construct the main sequence of Active Galactic Nuclei (AGNs). Despite several decades of observati…
High-redshift Extreme Variability Quasars from Sloan Digital Sky Survey Multi-Epoch Spectroscopy
Hengxiao Guo, Jiacheng Peng, Kaiwen Zhang +9
We perform a systematic search for high-redshift ( 1.5) extreme variability quasars (EVQs) using repeat spectra from the Sixteenth Data Release of Sloan Digital Sky Survey, wh…
Discovery of A Mg II Changing-look AGN and its Implications for a Unification Sequence of Changing-look AGNs
Hengxiao Guo, Mouyuan Sun, Xin Liu +5
Changing-Look (CL) is a rare phenomenon of Active Galactic Nuclei (AGNs) that exhibit emerging or disappearing broad lines accompanied by continuum variations on astrophysically sh…
Understanding Broad Mg II Variability in Quasars with Photoionization: Implications for Reverberation Mapping and Changing-Look Quasars
Hengxiao Guo, Yue Shen, Zhicheng He +7
The broad Mg II line in quasars has distinct variability properties compared with broad Balmer lines: it is less variable, and usually does not display a "breathing" mode, the incr…
On the Origin of the Dramatic Spectral Variability of WPVS 007
Junyao Li, Mouyuan Sun, Tinggui Wang +2
We report the discovery of large-amplitude mid-infrared variabilities (MIR; mag) in the Wide-field Infrared Survey Explorer W1 and W2 bands of the low-luminosity narrow-…
The properties of broad absorption line outflows based on a large sample of quasars
Zhicheng He, Tinggui Wang, Guilin Liu +8
Quasar outflows carry mass, momentum and energy into the surrounding environment, and have long been considered a potential key factor in regulating the growth of supermassive blac…
Effect of richness on AGN and star formation activities in SDSS galaxy groups
Feng Li, Yi-Zhou Gu, Qi-Rong Yuan +3
Based on a large sample of 254 220 galaxies in 81 089 groups, which are selected from the spectroscopic galaxy sample of the SDSS DR12, we investigate the radial distribution of in…
Morphology of AGN Emission Line Regions in SDSS-IV MaNGA Survey
Zhicheng He, Ai-Lei Sun, Nadia L. Zakamska +6
Extended narrow-line regions (NLRs) around active galactic nuclei (AGN) are shaped by the distribution of gas in the host galaxy and by the geometry of the circumnuclear obscuratio…
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…