activity
19962026
most citedASCA observations of the iron K complex of Circinus X-1 near zero phase: spectral evidence for partial covering

57 citations · 81 across the 11 of their papers we have counts for

collaborators

12 papers

astro-ph.HE2026

X-ray to Mid-IR Spectral Energy Distributions: A Catalog of X-ray Selected AGNs in the XMM-COSMOS Survey

Şeyda Şen, Eda Sonbas, Ece Kilerci +4

We present a component-resolved analysis of the IR--X-ray connection in a sample of 104 spectroscopically confirmed Type~1 AGN. By combining \xmm, \swift/UVOT, and new high--angula…

astro-ph.GA2026

The incidence of eROSITA X-ray AGN in the local Universe: from dwarf to massive galaxies

Z. Igo, A. Merloni, A. Georgakakis +22

Combining deep, wide-area X-ray surveys with multi-wavelength catalogues provides insights into rare, highly-accreting AGN and low-mass galaxies at low redshift, the latter potenti…

astro-ph.SR2026

SRG/eROSITA X-ray selected cataclysmic variable candidates observed in SDSS-V DR20

J. Brink, A. D. Schwope, K. G. Pradeep +35

We report on the spectroscopic observations obtained during SDSS-V DR20 of accreting compact binaries (ACB), specifically the cataclysmic variables (CVs), that were identified as l…

astro-ph.GA2026

The eROSITA X-ray luminosity function of active galactic nuclei

W. Roster, J. Buchner, M. Salvato +23

The X-ray luminosity function (XLF) of active galactic nuclei (AGN) provides an observational probe of the growth of supermassive black holes (SMBHs) across cosmic time. With its l…

astro-ph.HE2026

The Curious Case of PHL 1811: Heavy Obscuration Versus Intrinsic X-ray Weakness

B. Luo, Xiaolei Chen, Jian Huang +2

We present a systematic X-ray analysis of the narrow-line Type 1 quasar PHL 1811, which has long been regarded as the prototype of intrinsically X-ray weak quasars. A critical brea…

astro-ph.GA2025

SDSS-V Black Hole Mapper: The Index Diagram as a tool to disentangle the influence of the Host Galaxy in Quasar spectra

C. A. Negrete, R. Sandoval-Orozco, H. Ibarra-Medel +32

We revisit the Quasar Main Sequence (QMS) by investigating the impact of the stellar component from the host galaxy (HG) on the emission line spectra of the active galactic nuclei…

astro-ph.GA2025

The Compton-thick AGN Population and the Distribution of Low-mass AGN in our Cosmic Backyard

A. Annuar, D. M. Alexander, P. Gandhi +21

We present a census of the Compton-thick (CT) active galactic nucleus (AGN) population and the column density () distribution of AGN in our cosmic backyard using a mid-…

astro-ph.HE2024★ 10 cited

New JWST redshifts for the host galaxies of CDF-S XT1 and XT2: understanding their nature

J. Quirola-Vásquez, F. E. Bauer, P. G. Jonker +6

CDF-S XT1 and XT2 are considered two canonical extragalactic fast X-ray transients (FXTs). In this work, we report new constraints on both FXTs, based on recent JWST NIRCam and MIR…

astro-ph.HE2024

Test for Echo: X-ray Reflection Variability in the Seyfert-2 AGN NGC 4388

B. Gediman, J. M. Miller, A. Zoghbi +4

We report on a study of the narrow Fe K line and reflection spectrum in the well-known Seyfert-2 AGN, NGC 4388. X-ray spectra summed from two extensive NICER monitoring campaign…

astro-ph.HE2024★ 11 cited

The eROSITA Final Equatorial Depth Survey (eFEDS): the hard X-ray selected sample

K. Nandra, S. G. H. Waddell, T. Liu +25

During its calibration and performance verification phase, the eROSITA instrument aboard the SRG satellite performed a uniform wide--area X-ray survey of approximately 140 deg$^{2}…

astro-ph.HE2023★ 3 cited

The High Energy X-ray Probe (HEX-P): Bringing the Cosmic X-ray Background into Focus

Francesca Civano, Xiurui Zhao, Peter Boorman +29

Since the discovery of the cosmic X-ray background (CXB), astronomers have strived to understand the accreting supermassive black holes (SMBHs) contributing to its peak in the 10-4…

astro-ph1996★ 57 cited

ASCA observations of the iron K complex of Circinus X-1 near zero phase: spectral evidence for partial covering

W. N. Brandt, A. C. Fabian, T. Dotani +4

We report on ASCA energy spectra of Cir X-1 taken near its zero phase on 1994 August 4-5. The ASCA SIS detectors allow a more detailed study of the iron K complex than has been pos…