1.3k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of VirginiaUS239 papers
- Thomas Jefferson National Accelerator FacilityUS234 papers
- A. Alikhanyan National LaboratoryAM230 papers
- Florida International UniversityUS225 papers
- William & MaryUS220 papers
- Catholic University of AmericaUS210 papers
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiIT207 papers
- Old Dominion UniversityUS205 papers
- George Washington UniversityUS204 papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR203 papers
- Norfolk State UniversityUS203 papers
- University of ConnecticutUS202 papers
27 papers · 1 filter
Delving into the depths of NGC 3783 with XRISM: V. Broad-band modeling of ionized outflows
Keqin Zhao, Jelle S. Kaastra, Liyi Gu +7
The Seyfert 1 galaxy NGC 3783 hosts a multiphase warm absorber (WA) that has been extensively studied in the X-ray band. High-resolution spectra from 2000-2001 revealed a complex o…
A high-resolution X-ray view of the ultra-fast outflow in MAXI J1810-222
C. Pinto, M. Del Santo, A. D'Aì +10
In previous work, it was reported that the Galactic black hole candidate MAXI J1810-222 exhibited a notable absorption spectral feature at around 1 keV in low-resolution X-ray spec…
Delving into the depths of NGC 3783 with XRISM IV. Mapping of the accretion flow with Fe K emission lines
Chen Li, Jelle S. Kaastra, Liyi Gu +18
Using XRISM/Resolve time-averaged spectra of the well-known Seyfert-1.5 active galactic nucleus (AGN) in NGC 3783, we investigate the nature of the Fe K emission…
Delving into the depths of NGC 3783 with XRISM III. Birth of an ultrafast outflow during a soft flare
Liyi Gu, Keigo Fukumura, Jelle Kaastra +18
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 (57000 km/s). This event is sync…
A Song of Lines and Winds: Tracing the Signatures of AGN Outflows in X-rays
M. Laurenti, F. Tombesi, P. Condò +14
Ultra-fast outflows (UFOs) are highly ionized, mildly relativistic winds seen in the X-ray spectra of active galactic nuclei (AGN) and are thought to contribute to AGN feedback and…
Delving into the depths of NGC 3783 with XRISM II. Cross-calibration of X-ray instruments used in the large, multi-mission observational campaign
XRISM collaboration
Accurate X-ray spectroscopic measurements are fundamental for deriving basic physical parameters of the most abundant baryon components in the Universe. The plethora of X-ray obser…
Delving into the depths of NGC 3783 with XRISM. I. Kinematic and ionization structure of the highly ionized outflows
Missagh Mehdipour, Jelle S. Kaastra, Megan E. Eckart +17
We present our study of the XRISM observation of the Seyfert-1 galaxy NGC 3783. XRISM's Resolve microcalorimeter has enabled, for the first time, a detailed characterization of the…
Structured ionized winds shooting out from a quasar at relativistic speeds
XRISM collaboration
Evidence indicates that supermassive black holes exist at the centers of most galaxies. Their mass correlates with the galactic bulge mass, suggesting a co-evolution with their hos…
Poynting-Robertson effect on black-hole-driven winds
M. Marzi, F. Tombesi, A. Luminari +2
Layers of ionized plasma, in the form of winds ejected from the accretion disk of Supermassive Black Holes (SMBHs) are frequently observed in Active Galactic Nuclei (AGNs). Winds w…
Tell-Tale Spectral Signatures of MHD-driven Ultra-Fast Outflows in AGNs
Keigo Fukumura, Mauro Dadina, Gabriele Matzeu +3
We aim to explore spectral signatures of the predicted multi-ion UFOs in the broadband X-ray spectra of active galactic nuclei (AGNs) by exploiting an accretion disk wind model in…
NuSTAR monitoring of MAXI J1348-630: evidence of high density disc reflection
Sudip Chakraborty, Ajay Ratheesh, Sudip Bhattacharyya +4
We present the broadband spectral analysis of all the six hard, intermediate and soft state NuSTAR observations of the recently discovered transient black hole X-ray binary MAXI J1…
Modeling Magnetic Disk-Wind State Transitions in Black Hole X-ray Binaries
Keigo Fukumura, Demosthenes Kazanas, Chris Shrader +3
We analyze three prototypical black hole (BH) X-ray binaries (XRBs), \4u1630, \gro1655\ and \h1743, in an effort to systematically understand the intrinsic state transition of the…
A variable magnetic disc wind in the black hole X-ray binary GRS 1915+105?
Ajay Ratheesh, Francesco Tombesi, Kiego Fukumura +3
GRS 1915+105 being one of the brightest transient black hole binary (BHB) in the X-rays, offers a unique test-bed for the study of the connection between accretion and ejection mec…
Iron Line Tomography of General Relativistic Hydrodynamic Accretion around Kerr Black Holes
Kaitlyn Porter, Keigo Fukumura
We consider a temporal response of relativistically broadened line spectrum of iron from black hole accretion irradiated by an X-ray echo under strong gravity. The physical conditi…
On the importance of special relativistic effects in modelling ultra-fast outflows
A. Luminari, F. Tombesi, E. Piconcelli +5
Outflows are observed in a variety of astrophysical sources. Remarkably, ultra-fast (), outflows in the UV and X-ray bands are often seen in AGNs. Depending on their en…
Constraining X-ray Coronal Size with Transverse Motion of AGN Ultra-Fast Outflows
Keigo Fukumura, Francesco Tombesi
One of the canonical physical properties of ultra-fast outflows (UFOs) seen in a diverse population of active galactic nuclei (AGNs) is its seemingly very broad width (i.e. $Δv \si…
Astro2020 Science White Paper: Do Supermassive Black Hole Winds Impact Galaxy Evolution?
F. Tombesi, M. Cappi, F. Carrera +11
Powerful winds driven by supermassive black holes (SMBHs) are likely the main mechanism through which SMBHs regulate their own growth and influence the host galaxy evolution. Howev…
Variable Nature of Magnetically-Driven Ultra-Fast Outflows
Keigo Fukumura, Demosthenes Kazanas, Chris Shrader +3
Among a number of active galactic nuclei (AGNs) that drive ionized outflows in X-rays, a low-redshift (z = 0.184) quasar, PDS 456, is long known to exhibit one of the exemplary ult…
Magnetized Disk-Winds in NGC 3783
Keigo Fukumura, Demosthenes Kazanas, Chris Shrader +3
We analyze a 900-ks stacked Chandra/HETG spectrum of NGC 3783 in the context of magnetically-driven accretion-disk wind models in an effort to provide tight constraints on the glob…
Magnetically Advected Winds
Ioannis Contopoulos, Demosthenes Kazanas, Keigo Fukumura
Observations of X-ray absorption lines in magnetically driven disk winds around black hole binaries and active galactic nuclei yield a universal radial density profile rho proporti…
Magnetic Origin of Black Hole Winds Across the Mass Scale
Keigo Fukumura, Demosthenes Kazanas, Chris Shrader +3
Black hole accretion disks appear to produce invariably plasma outflows that result in blue-shifted absorption features in their spectra. The X-ray absorption-line properties of th…
Soft X-Ray Excess from Shocked Accreting Plasma in Active Galactic Nuclei
Keigo Fukumura, Douglas Hendry, Peter Clark +2
We propose a novel theoretical model to describe a physical identity of the soft X-ray excess, ubiquitously detected in many Seyfert galaxies, by considering a steady-state, axisym…
An Empirical Determination of the Intergalactic Background Light from UV to FIR Wavelengths Using FIR Deep Galaxy Surveys and the Gamma-ray Opacity of the Universe
Floyd W. Stecker, Sean T. Scully, Matthew A. Malkan
We have previously calculated the intergalactic background light (IBL) as a function of redshift in the far ultraviolet to near infrared range, based purely on data from deep galax…
Magnetically-Driven Accretion-Disk Winds and Ultra-Fast Outflows in PG1211+143
Keigo Fukumura, Francesco Tombesi, Demosthenes Kazanas +3
We present a study of X-ray ionization of magnetohydrodynamic (MHD) accretion-disk winds in an effort to constrain the physics underlying the highly-ionized ultra-fast outflows (UF…