Steven Haemmerich

Rapid jet ejection from PKS 0215+015 coincident with a high-energy neutrino event

Florian Eppel, M. Kadler, E. Ros, P. Benke et autres

Aims. We present a new neutrino-blazar multiwavelength-flare coincidence, observed in the blazar PKS 0215+015 that showed a strong multiwavelength outburst in positional and temporal coincidence with the IceCube neutrino track alert IC220225A similar to the case of TXS 0506+056. We investigate the …

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Rapid jet ejection from PKS 0215+015 coincident with a high-energy neutrino event

Florian Eppel, M. Kadler, E. Ros, P. Benke et autres

Aims. We present a new neutrino-blazar multiwavelength-flare coincidence, observed in the blazar PKS 0215+015 that showed a strong multiwavelength outburst in positional and temporal coincidence with the IceCube neutrino track alert IC220225A similar to the case of TXS 0506+056. We investigate the …

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

T. Saha, Alex G. Markowitz, D. Homan, M. Krumpe et autres

Context. Multiwavelength studies of transients in actively accreting supermassive black holes have revealed that large-amplitude variability is frequently linked to significant changes in the optical spectra. This phenomenon is known as a changing-look active galactic nucleus (CLAGN). Aims. In 2020, the Zwicky …

Multi-wavelength study of 1eRASS J085039.9−421151 with eROSITA, NuSTAR, and X-shooter

A. Zainab, A. Avakyan, Victor Doroshenko, P. Thalhammer et autres

The eROSITA instrument on board Spectrum-Roentgen-Gamma (SRG) has completed four scans of the X-ray sky, leading to the detection of almost one million X-ray sources in eRASS1 alone, including multiple new X-ray binary candidates. We report on analysis of the X-ray binary …

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

A. Zainab, Artur Avakyan, Victor Doroshenko, P. Thalhammer et autres

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, including multiple new X-ray binary candidates. We report on analysis of the X-ray binary 1eRASS …

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

M. Krumpe, D. Homan, R. Brogan, Steven Haemmerich et autres

Context. Extreme continuum variability in extragalactic nuclear sources can indicate extreme changes in accretion flows onto supermassive black holes. Aims. We explore the multiwavelength nature of a continuum flare in the Seyfert LCRS B040659.9−385922. The all-sky X-ray surveys conducted by the Spectrum …

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

Sandhya Krishnan, Alex G. Markowitz, M. Krumpe, Daniel C. Homan et autres

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 the Seyfert LCRS B040659.9$-$385922. The all-sky X-ray surveys conducted by the eROSITA showed that its X-ray …

eROSITA detection of a cloud obscuration event in the Seyfert AGN EC 04570–5206

Alex G. Markowitz, M. Krumpe, D. Homan, Mariusz Gromadzki et autres

Context. Recent years have seen broad observational support for the presence of a clumpy component within the circumnuclear gas around supermassive black holes (SMBHs). In the X-ray band, individual clouds can manifest themselves when they transit the line of sight to the …

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

Alex G. Markowitz, M. Krumpe, D. Homan, Mariusz Gromadzki et autres

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 manifest themselves when they transit the line of sight to the X-ray corona, temporarily obscuring …

us, pl, de, rs, jp, Afrique du Sud (code pays fourni par la source)

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

T. Saha, Alex G. Markowitz, D. Homan, M. Krumpe et autres

Context. Multiwavelength studies of transients in actively accreting supermassive black holes have revealed that large-amplitude variability is frequently linked to significant changes in the optical spectra -- a phenomenon known as changing-look AGN (CLAGN).} Aims. In 2020, the Zwicky Transient Facility detected …

SRG/eROSITA detection of 4FGL J0658.6+0636 prior to high-energy neutrino alert IceCube-201114A

Andrea Gokus, Steven Haemmerich, Arne Rau, J. Wilms