activity
20232026
most citedMultiwavelength study of extreme variability in LEDA 1154204: A changing-look event in a type 1.9 Seyfert

1 citations · 1 across the 5 of their papers we have counts for

collaborators

5 papers

astro-ph.HE2026

The SRG/eROSITA All-Sky Survey DR2: Cumulative X-ray catalogues from the first three surveys and multi-wavelength counterparts in the western Galactic hemisphere

M. E. Ramos-Ceja, G. Lamer, M. Salvato +111

The eROSITA telescope array on board the Spektrum-Roentgen-Gamma (SRG) mission began its all-sky survey program in December 2019, scanning the sky at an approximately six-month cad…

astro-ph.HE2024

Multiwavelength study of 1eRASS J085039.9-421151 with eROSITA NuSTAR and X-shooter

Aafia Zainab, Artur Avakyan, Victor Doroshenko +23

The eROSITA instrument on board Spectrum-Roentgen-Gamma has completed four scans of the X-ray sky, leading to the detection of almost one million X-ray sources in eRASS1 only, incl…

astro-ph.HE2024

An X-ray flaring event and a variable soft X-ray excess in the Seyfert LCRS B040659.9-385922 as detected with eROSITA

S. Krishnan, A. G. Markowitz, M. Krumpe +13

Extreme continuum variability in AGNs can indicate extreme changes in accretion flows onto supermassive black holes. We explore the multiwavelength nature of a continuum flare in t…

astro-ph.HE2024

eROSITA Detection of a Cloud Obscuration Event in the Seyfert AGN EC 04570-5206

Alex Markowitz, Mirko Krumpe, David Homan +13

Recent years have seen broad observational support for the presence of a clumpy component within the circumnuclear gas around SMBHs. In the X-ray band, individual clouds can manife…

astro-ph.HE2023★ 1 cited

Multiwavelength study of extreme variability in LEDA 1154204: A changing-look event in a type 1.9 Seyfert

T. Saha, A. Markowitz, D. Homan +16

Context. Multiwavelength studies of transients in actively accreting supermassive black holes have revealed that large-amplitude variability is frequently linked to significant cha…