N. Torres-Albà

Supermassive Black Hole Winds in X-rays -- SUBWAYS. VI. Interplay between the soft X-ray excess and ultra-fast outflows

V. E. Gianolli, P-O. Petrucci, S. Bianchi +42

We present a broadband, multiwavelength study of the interplay between the soft X-ray excess (SE), ultra-fast outflows (UFOs), and warm absorbers (WAs) in 21 active galactic nuclei…

A relativistic inflow candidate in a quasar at cosmic noon

Yerong Xu, Xiurui Zhao, Elena Bertola +14

Cosmic noon ( $z \sim 2$ ) marks the peak epoch of cosmic star formation and black hole accretion activity, where strong accretion and outflows are expected. We report two candidate ab…

PEARLS: NuSTAR and XMM-Newton Extragalactic Survey of the JWST North Ecliptic Pole Time-Domain Field V: Unraveling X-ray Spectral Variability

Samantha Creech, Francesca Civano, Daniel Wik +13

As one of the first deep time-domain surveys in the hard X-ray band, the NuSTAR campaign in the JWST North Ecliptic Pole Time Domain Field (NEP-TDF) offers a prime opportunity to m…

AT 2016blu: Accretion-Powered Outbursts in a Luminous Blue Variable and Compact Object Binary

Mojgan Aghakhanloo, Núria Torres-Albà, Nathan Smith +33

We present the first X-ray detection of the supernova (SN) impostor AT 2016blu in NGC 4559. AT 2016blu exhibited 27 detected quasiperiodic (~113 day) outbursts between 2012 and Jun…

Testing X-ray Periodicity and Long-Term Trend in PG 1553+113 via Targeted Swift-XRT Monitoring

P. Peñil, N. Torres-Albà, L. Marcotulli +5

PG~1553+113 is the blazar with the most-significantly detected periodic patter in its multiwavelength (MWL) emission, making it one of the most promising candidates for hosting a s…

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.HE2026★ 1 cited

Source identification for the Swift-BAT 150-month hard X-ray catalog using soft X-ray observations

K. Imam, N. Torres-Alba, S. Marchesi +10

We present a comprehensive catalog of 251 potential counterparts for 250 unassociated hard X-ray sources detected in the Swift Burst Alert Telescope (BAT) 150-month hard X-ray surv…

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…

Distortions in Periodicity Analysis of Blazars II: The Impact of Gaps

P. Peñil, N. Torres-Albà, A. Rico +4

Time series analysis is fundamental to characterizing the variability inherent in multi-wavelength emissions from blazars. However, a major observational challenge lies in the need…

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…

Deciphering the explosion mechanism of Type-Ia SNe using their remnants I: general properties and a case study on Tycho's SNR

Soham Mandal, Núria Torres-Albà, Carles Badenes +1

Type-Ia supernovae (SNe), or runaway thermonuclear explosions of white dwarfs (WDs), play a critical role in the chemical evolution of galaxies, and are important cosmological dist…

Contemporaneous X-ray and Optical Polarization of EHSP Blazar H 1426+428

Anuvab Banerjee, Akash Garg, Divya Rawat +17

We present the first contemporaneous X-ray and optical polarimetric measurement of the extremely high synchrotron peaked (EHSP) blazar H 1426+428. The X-ray polarimetric observatio…

Distortions in Periodicity Analysis of Blazars: The Impact of Flares

Pablo Peñil, Nuria Torres-Albà, Alba Rico +3

Blazars, a unique class of active galactic nuclei, exhibit highly variable emission across the electromagnetic spectrum. This variability frequently manifests as intense flaring ev…

X-ray polarization observations of NGC 2110 with IXPE

I. Pal, S. Marchesi, N. Torres-Albá +6

X-ray polarimetric observations from the Imaging X-ray Polarimeter Explorer (IXPE) is an excellent tool for probing the geometry and dynamics of X-ray emitting corona in active gal…

Swift-XRT and NuSTAR Monitoring of Obscuration Variability in Mrk 477

N. Torres-Albà, Z. Hu, I. Cox +6

We present the analysis of 15 X-ray observations of Mrk 477, a nearby Seyfert 2 active galactic nucleus, with the objective to monitor its obscuring column density variability. The…

astro-ph.HE2025★ 3 cited

Chandra Follow-up Observations of Swift-BAT-selected AGNs III

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

The cosmic X-ray background (CXB) is dominated by the obscured and unobscured coronal light of active galactic nuclei (AGN). At energies below 10 keV, the CXB can be well explained…

An Intermediate Mass Black Hole Hidden Behind Thick Obscuration

Peter G. Boorman, Daniel Stern, Roberto J. Assef +12

Recent models suggest approximately half of all accreting supermassive black holes (SMBHs; $M_{BH}$ $≳$ 10 $^{5}$ M $_{⊙}$ ) are expected to undergo intense growth phase…

astro-ph.HE2024★ 3 cited

A Multi-Wavelength Characterization of the Obscuring Medium at the Center of NGC 6300

D. Sengupta, N. Torres-Albà, A. Pizzetti +9

Most of the super-massive black holes in the Universe accrete material in an obscured phase. While it is commonly accepted that the "dusty torus" is responsible for the nuclear obs…

Discovering High- $z$ BL Lacs Using Swift/UVOT and SARA Observations with the Dropout Technique

Y. Sheng, K. Imam, A. Kaur +14

Measuring spectroscopic redshifts for BL Lacertae (BL Lac) objects, a class of blazar, is challenging because their optical spectrum lacks, or has weak, emission lines ( equivalent…

Hydrogen Column Density Variability in a Sample of Local Compton-Thin AGN II

A. Pizzetti, N. Torres-Alba, S. Marchesi +7

We present the multi-epoch analysis of 13 variable, nearby (z<0.1), Compton-thin (22<logN_H<24) active galactic nuclei (AGN) selected from the 105-month BAT catalog. Analyzing all…

Multiwavelength Variability Analysis of Fermi-LAT Blazars

P. Peñil, J. Otero-Santos, M. Ajello +6

Blazars present highly variable $γ$ -ray emission. This variability, which can range from a few minutes to several years, is also observed at other wavelengths across the entire ele…