Xiurui Zhao

PEARLS: NuSTAR and XMM-Newton Extragalactic Survey of the JWST North Ecliptic Pole Time-Domain Field IV: X-Ray Variability Analysis

Ross Silver, Francesca Civano, Xiurui Zhao +31

NuSTAR and XMM-Newton have observed the James Webb Space Telescope (JWST) North Ecliptic Pole (NEP) Time-Domain Field (TDF) for almost five contiguous years starting in 2019. In th…

X-ray Absorption Variability in NGC 1142: Another Constraint on the Nature of the Torus/Broad-Line Region in Active Galactic Nuclei

Isaiah S. Cox, Núria Torres-Albà, Stefano Marchesi +5

The physics, geometry, and kinematics of the gas and dust surrounding the central engine of active galactic nuclei (AGN) are not well understood. In some sources, this material obs…

The hidden variability of the torus in local Active Galactic Nuclei: 20 years of Chandra, XMM-Newton, and NuSTAR observations

Vittoria Elvezia Gianolli, Nuria Torres-Alba, Stefano Marchesi +9

X-ray absorption variability in active galactic nuclei (AGN) provides key constraints on the structure and dynamics of the circumnuclear obscuring medium, the so-called torus. A fr…

PEARLS: NuSTAR and XMM-Newton Extragalactic Survey of the JWST North Ecliptic Pole Time Domain Field VI: Multiwavelength SED Analysis

Rafael Ortiz, Francesca Civano, Rogier A. Windhorst +27

We model spectral energy distributions of 261 X-ray sources to $z \sim 5$ in the North Ecliptic Pole Time Domain Field, extending prior XMM-Newton and NuSTAR analyses. Using the st…

astro-ph.SR2026

A Minute-Cadence Deep Bulge Survey: First Data Release of DREAMS

Hongjing Yang, Weicheng Zang, Francisco Valdes +31

The DECam Rogue Earths and Mars Survey (DREAMS), a NOIRLab survey program, has been conducting a three-year survey covering a 5 deg $^{2}$ area in the Galactic bulge (roughly spanning…

PEARLS: JWST Counterparts of Micro-Jy Radio Sources in the NEP Time Domain Field. II. All Four Spokes

S. P. Willner, Hansung B. Gim, Maria del Carmen Polletta +18

JWST/NIRCam observations in the North Ecliptic Pole Time Domain Field (TDF) identify 4.4 micron counterparts for 206 of 211 radio sources with S(3 GHz) \gapprox 5 micro-Jy in a 65a…

Characterizing the Gamma-ray Emission from Low-Luminosity AGN

Chris Karwin, Nikita Khatiya, Margot Boughelilba +3

A majority of the active galactic nuclei (AGN) in the local Universe are classified as low-luminosity AGN (LLAGN), having bolometric luminosities $\lesssim 10^{42} \ \mathrm{erg \…

Compton-thick AGN in the NuSTAR Era. XI. Analyzing 11 CT-AGN Candidates Selected with Machine Learning

Ross Silver, Nuria Torres-Alba, Stefano Marchesi +8

This work discusses the broadband X-ray spectral analysis of 11 candidate heavily-obscured active galactic nuclei (AGN) selected based on their infrared and X-ray properties by a r…

PACHA: Probing AGN Coronae with High-redshift AGN

Xiurui Zhao, Elias Kammoun, Marco Ajello +18

The X-ray emission of active galactic nuclei (AGN) is generally attributed to inverse Compton scattering of accretion-disk photons by hot electrons in a compact corona. In local AG…

Transient Relativistic Iron Emission Line from an X-ray Flaring Supermassive Black Hole

Xiurui Zhao, Marco Ajello, Francesca Civano +16

We report the discovery of the first transient relativistic iron Kα line in an Active Galactic Nucleus (AGN) J1047+5907. The line was detected 21.5 days (rest-frame) after an X-ray…

astro-ph.EP2026★ 3 cited

KMT-2025-BLG-1616Lb: First Microlensing Bound Planet From DREAMS

Hongjing Yang, Weicheng Zang, Yoon-Hyun Ryu +60

We present observations and analysis of the bound planetary microlensing event KMT-2025-BLG-1616. The planetary signal was captured by the Korea Microlensing Telescope Network (KMT…

Fast X-ray Variability from the Coronae of Supermassive Black Holes

Xiurui Zhao, Luca Comisso, Stefano Marchesi +4

We present the first systematic study of short-timescale X-ray variability in radio-quiet active galactic nuclei (AGN), utilizing archival Chandra observations of approximately 3,0…

astro-ph.HE2025★ 3 cited

The Advanced X-ray Imaging Satellite (AXIS) Community Science Book

Michael Koss, Nafisa Aftab, Steven W. Allen +395

The AXIS Community Science Book represents the collective effort of 592 scientists worldwide to define the transformative science enabled by the Advanced X-ray Imaging Satellite (A…

The $N_{H}$ Distribution of Hard X-ray Selected AGN in the NEP Field

Samantha Creech, Francesca Civano, Daniel R. Wik +9

X-ray surveys are one of the most unbiased methods for detecting Compton Thick (CT; $N_{H} \geq 1 0^{24}$ cm $^{- 2}$ ) AGN, which are thought to comprise up to $60%$ of AGN…

PEARLS: NuSTAR and XMM-Newton Extragalactic Survey of the JWST North Ecliptic Pole Time-domain Field III

Ross Silver, Francesca Civano, Xiurui Zhao +28

The James Webb Space Telescope (JWST) North Ecliptic Pole (NEP) Time-Domain Field (TDF) has been monitored by NuSTAR and XMM-Newton with a regular cadence for five years starting i…

Unveiling Obscured Accretion in the Local Universe

Indrani Pal, Stefano Marchesi, Ross Silver +9

Heavily obscured Active Galactic Nuclei (AGN), especially Compton-thick sources with line-of-sight column density ( $N_{H, los}$ ) $>$ 10 $^{24}$ cm $^{- 2}$ , are critical to underst…

astro-ph.SR2025

Hard X-ray Emission in AU Mic Flares: A Minor Contributor to Planetary Atmospheric Escape

Yifan Hu, Murray Brightman, Fabio Favata +7

Stellar flares are potent drivers of atmospheric evolution on orbiting exoplanets, primarily through extreme ultraviolet (EUV) and soft X-ray (XUV) irradiation. However, the contri…

astro-ph.GA2025

A systematic search for AGN obscuration variability in the Chandra archive

Isaiah S. Cox, Núria Torres-Albà, Stefano Marchesi +5

The nature of the obscuring material in active galactic nuclei (AGN) can be studied by measuring changes in the line-of-sight column density, $N_{H, los}$ , over time. This can b…