Jon M. Miller

Investigating the Periodic X-Ray Behaviour in the Eclipsing AGN NGC 6814

Thomas O. Hodd, Luigi Gallo, A G Gonzalez, Jon M. Miller et autres

Abstract A 2016 XMM-Newton X-ray light curve of the Seyfert 1.5 galaxy NGC 6814 exhibited clear eclipsing behavior, with distinct ingress and egress, during half of the observation. Here, we report on the periodic behavior in the light curve prior to the …

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XRISM/Resolve Observations of Hercules X-1: A Pulsating, Highly Broadened Fe K Emission Line from the Neutron Star Accretion Column

Peter Kosec, Laura W. Brenneman, Erin Kara, Ciro Pinto et autres

Abstract The study of X-ray pulsar accretion columns helps us characterize accretion physics in this extreme regime of strong gravity and strong magnetic fields. Previous observations of the X-ray pulsar Hercules X-1 revealed a highly broadened Fe K emission line, associated with …

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Observation of a Solar-like Magnetic Reconnection Event in an AGN Corona with XRISM

Gal Vardi, Ehud Behar, Liyi Gu, Jelle S. Kaastra et autres

Abstract The X-ray source in active galactic nuclei (AGNs) is commonly referred to as the corona by analogy to stellar coronae. The similarities between the two suggest that the heating mechanism of AGN coronae is magnetic reconnection—as in cool stars—but this has …

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Reverberation in the Narrow Fe K α Line in the Seyfert Galaxy NGC 4151 with XRISM

Jon M. Miller, Abderahmen Zoghbi, Xin Xiang, Doyee Byun et autres

Abstract Emission lines that “echo” variations in the ionizing flux produced close to black holes are powerful probes of the central engine. In the Seyfert-1.5 galaxy NGC 4151, high-resolution X-ray spectra and time lags in low-resolution X-ray data suggest that part of …

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3-79keV NuSTAR obs. of Swift J1728.9-3613

Paul A. Draghis, M. Balakrishnan, Jon M. Miller, Edward M. Cackett et autres

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The Dynamic Central Environment of NGC 3516 Revealed by XRISM

Anna Juráňová, Erin Kara, Ehud Behar, E. Costantini et autres

Abstract We present a detailed, time-resolved analysis of the Fe K band of the Seyfert 1.5 galaxy NGC 3516 observed with XRISM. The 249 ks observation spanning ∼310 ks in elapsed time reveals an exceptionally rich and time-variable absorption spectrum. Six distinct …

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XRISM/Resolve Observations of Hercules X-1: Vertical Structure and Kinematics of the Disk Wind

Peter Kosec, Laura W. Brenneman, Erin Kara, Teruaki Enoto et autres

Abstract X-ray binary accretion disk winds can carry away a significant fraction of the matter transferred from the companion and hence strongly affect the accretion flow and the long-term evolution of the binary. However, accurate mass outflow rate measurements are challenging due …

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Disentangling multiple gas kinematic drivers in the Perseus galaxy cluster

Marc Audard, Hisamitsu Awaki, Ralf Ballhausen, Bamba Aya et autres

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Delving into the depths of NGC 3783 with XRISM

Chen Li, Jelle S. Kaastra, Liyi Gu, Missagh Mehdipour et autres

Using XRISM/Resolve 439 ks time-averaged spectra of the well-known Seyfert-1.5 active galactic nucleus (AGN) in NGC 3783, we investigated the nature of the Fe K α emission line at 6.4 keV, the strongest and most common X-ray line observed in AGNs. Even …

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Multilayered Fast Wind Observed in XMM-Newton Snapshot of Seyfert 1 Markarian 877

Xin Xiang, Jon M. Miller, Ehud Behar, William Nielsen Brandt et autres

Abstract Ultrafast outflows (UFOs) are powerful, highly ionized winds launched from the innermost regions of active galactic nuclei (AGNs), reaching velocities of 0.03–0.3 c and playing a key role in AGN feedback. We present a photoionization analysis of an 18 ks XMM-Newton …

The very faint X-ray transient Swift J174610–290018 at the Galactic center

Giovanni Stel, G. Ponti, Nathalie Degenaar, L. Sidoli et autres

Context . Very faint X-ray transients (VFXTs) are a class of X-ray binary systems that exhibit occasional outbursts with peak X-ray luminosities ( L X ≲ 10 36 erg s −1 ) much lower than those of typical X-ray transients. On 22 …

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Delving into the depths of NGC 3783 with XRISM

Liyi Gu, Keigo Fukumura, Jelle S. Kaastra, Megan Eckart et autres

The 2024 X-ray/UV observation campaign of NGC 3783, led by XRISM, revealed the launch of an ultrafast outflow (UFO) with a radial velocity of 0.19c (57 000 km s−1). This event is synchronized with the sharp decay, within less than half a …

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