Publications (16)
The Drivers of the Decline in Supermassive Black Hole Growth at
Zhibo Yu, W. N. Brandt, Fan Zou +4
It is well established that cosmic supermassive black hole (SMBH) growth peaks at , followed by a strong decline of toward the present day, w…
The Nature of an Unidentified X-ray Source in the 7 Ms Chandra Deep Field-South Catalog
Quinn P. Sullivan, Zhibo Yu, William N. Brandt +2
In the 7 Ms Chandra Deep Field-South catalog, only one source, XID 912, was highly significantly detected in X-rays but had no formally reported counterparts in the UV, optical, in…
A Rapidly Accreting Active Galactic Nucleus Hidden in a Dust-Obscured Galaxy at
Nathan Cristello, Fan Zou, William N. Brandt +3
Dust-obscured galaxies (DOGs) containing central supermassive black holes (SMBHs) that are rapidly accreting (i.e., having high Eddington ratios, ) may represent a…
The Routing Plateau: Understanding and Breaking the Accuracy Limits of LLM Routers
Yifan Lu, Qiyue Zhang, Shenrun Zhang +4
LLM routing has become a popular approach to improve the cost-quality trade-off of LLM services by dynamically selecting a model for each query. Recent work has explored a broad ra…
Stellar Masses and Star-Formation Rates of Galaxies and AGNs in the eFEDS GAMA09 Field
Zhibo Yu, Fan Zou, William N. Brandt
The eFEDS is a wide 140 deg field that has extensive multiwavelength coverage. To improve the utility of the existing data, we use CIGALE to fit source Spectral Energ…
Dust-Obscured Galaxies in the XMM-SERVS Fields: Selection, Multiwavelength Characterization, and Physical Nature
Zhibo Yu, W. N. Brandt, Fan Zou +7
Dust-obscured galaxies (DOGs) are enshrouded by dust, and many are believed to host accreting supermassive black holes (SMBHs), which makes them unique objects for probing the coev…
The Low Temperature Corona in ESO 511G030 Revealed by NuSTAR and XMM-Newton
Zuobin Zhang, Jiachen Jiang, Honghui Liu +9
We present the results from a coordinated XMM-Newton NuSTAR observation of the Seyfert 1 Galaxy ESO 511G030. With this joint monitoring programme, we conduct a detailed vari…
Investigating the Star-Formation Characteristics of Radio Active Galactic Nuclei
Bojun Zhang, Fan Zou, W. N. Brandt +5
The coevolution of supermassive black holes and their host galaxies represents a fundamental question in astrophysics. One approach to investigating this question involves comparin…
Reflection spectra of accretion disks illuminated by disk-like coronae
Shafqat Riaz, Askar B. Abdikamalov, Dimitry Ayzenberg +3
Relativistic reflection features in the X-ray spectra of black hole binaries and AGNs are thought to be produced through illumination of a cold accretion disk by a hot corona. In t…
Narrow-Line Seyfert 1 Galaxies Beyond the Local X-ray Universe: An X-ray spectral sample
Jiachen Jiang, Dominic J. Walton, Luigi C. Gallo +8
Narrow-line Seyfert 1 AGNs (NLS1s) represent a unique stage in the black hole growth history, characterised by low black hole masses of approximately - solar masses…
Constraining the Konoplya-Rezzolla-Zhidenko deformation parameters II: limits from stellar-mass black hole X-ray data
Zhibo Yu, Qunfeng Jiang, Askar B. Abdikamalov +5
Astrophysical black holes are thought to be the Kerr black holes predicted by general relativity, but macroscopic deviations from the Kerr solution can be expected from a number of…
The X-ray Link Between High Eddington Ratio Dust-Obscured Galaxies (DOGs) and Hot DOGs
Fan Zou, W. N. Brandt, Elena Gallo +2
Dust-obscured galaxies (DOGs) with extremely red optical-to-infrared colors are often associated with intense starburst and AGN activity. Studying DOGs can provide insights into th…
The Remarkable X-ray Spectra and Variability of the Ultraluminous Weak-Line Quasar SDSS J1521+5202
Shouyi Wang, W. Niel Brandt, Bin Luo +4
We present a focused X-ray and multiwavelength study of the ultraluminous weak-line quasar (WLQ) SDSS J1521+5202, one of the few X-ray weak WLQs that is amenable to basic X-ray spe…
Mapping the Growth of Supermassive Black Holes as a Function of Galaxy Stellar Mass and Redshift
Fan Zou, Zhibo Yu, W. N. Brandt +3
The growth of supermassive black holes is strongly linked to their galaxies. It has been shown that the population mean black-hole accretion rate () prima…
The Cosmic Evolution of the Supermassive Black Hole Population: A Hybrid Observed Accretion and Simulated Mergers Approach
Fan Zou, W. N. Brandt, Elena Gallo +4
Supermassive black holes (SMBHs) can grow through both accretion and mergers. It is still unclear how SMBHs evolve under these two channels from high redshifts to the SMBH populati…
An XMM-Newton Study of Six Narrow-Line Seyfert 1 Galaxies at z = 0.35--0.92
Zhibo Yu, Jiachen Jiang, Cosimo Bambi +5
We report a detailed analysis of the XMM-Newton spectra of six Narrow-Line Seyfert 1 (NLS1) galaxies at redshift z = 0.35--0.92. Compared with the NLS1s at lower redshift in the pr…