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Simultaneous NICER and NuSTAR Observations of the Ultra-compact X-ray Binary 4U 1543-624
R. M. Ludlam, A. D. Jaodand, J. A. García +8
We present the first joint NuSTAR and NICER observations of the ultra-compact X-ray binary (UCXB) 4U 1543624 obtained in 2020 April. The source was at a luminosity of $L_{0.5-50…
The Awakening Beast in the Seyfert 1 Galaxy KUG 1141+371 I
Jiachen Jiang, Huaqing Cheng, Luigi C. Gallo +10
KUG 1141+371 is a Seyfert 1 galaxy that shows a simultaneous flux increase in the optical and UV bands in the past decade. For instance, the latest Swift observation in 2019 shows…
A Full Characterisation of the Supermassive Black Hole in IRAS 09149-6206
D. J. Walton, W. N. Alston, P. Kosec +11
We present new broadband X-ray observations of the type-I Seyfert galaxy IRAS 09149-6206, taken in 2018 with -, and . The source is highly complex, sho…
Detection of a possible multiphase ultra-fast outflow in IRAS 13349+2438 with NuSTAR and XMM-Newton
M. L. Parker, G. A. Matzeu, W. N. Alston +6
We present joint NuSTAR and XMM-Newton observations of the bright, variable quasar IRAS 13349+2438. This combined dataset shows two clear iron absorption lines at 8 and 9 keV, whic…
A Redshifted Inner Disk Atmosphere and Transient Absorbers in the Ultra-Compact Neutron Star X-ray Binary 4U 1916-053
Nicolas Trueba, J. M. Miller, A. C. Fabian +8
The very small accretion disks in ultra-compact X-ray binaries (UCXBs) are special laboratories in which to study disk accretion and outflows. We report on three sets of new (250 k…
An Obscured, Seyfert-2-like State of the Stellar-mass Black Hole GRS 1915+105 Caused by Failed Disk Winds
J. M. Miller, A. Zoghbi, J. Raymond +13
We report on Chandra gratings spectra of the stellar-mass black hole GRS 1915+105 obtained during a novel, highly obscured state. As the source entered this state, a dense, massive…
A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares
V. A. Cúneo, K. Alabarta, L. Zhang +18
The black hole candidate and X-ray binary MAXI J1535-571 was discovered in September 2017. During the decay of its discovery outburst, and before returning to quiescence, the sourc…
The Origin of X-ray Emission in the Gamma-ray emitting Narrow-Line Seyfert 1 1H 0323+342
Sergio A. Mundo, Erin Kara, Edward M. Cackett +7
We present the results of X-ray spectral and timing analyses of the closest gamma-ray emitting narrow-line Seyfert 1 (-NLS1) galaxy, 1H 0323+342. We use observations from a rece…
Is there an enormous cold front at the virial radius of the Perseus cluster?
S. A. Walker, M. S. Mirakhor, J. ZuHone +3
We present new XMM-Newton observations extending the mosaic of the Perseus cluster out to the virial radius to the west. Previous studies with ROSAT have reported a large excess in…
Characterising continuum variability in the radio-loud narrow-line Seyfert 1 galaxy IRAS 17020+4544
A. G. Gonzalez, L. C. Gallo, P. Kosec +4
We present results of temporal and spectral analyses on four XMM-Newton EPIC pn observations of IRAS 17020+4544, a narrow-line Seyfert 1 galaxy with evidence of a radio jet. Analys…
Broad-band X-ray observation of broad-line radio galaxy 3C 109
Sulov Chalise, Anne M. Lohfink, Erin Kara +1
We present a study of the central engine in the broad-line radio galaxy 3C 109. To investigate the immediate surrounding of this accreting, supermassive black hole, we perform a mu…
NICER-NuSTAR Observations of the Neutron Star Low-Mass X-ray Binary 4U 1735-44
R. M. Ludlam, E. M. Cackett, J. A. García +8
We report on the first simultaneous and observations of the neutron star (NS) low-mass X-ray binary 4U 173544, obtained in 2018 August. The source was at a lumi…
Swift Spectroscopy of the Accretion Disk Wind in the Black Hole GRO J1655-40
M. Balakrishnan, J. M. Miller, N. Trueba +6
Chandra obtained two High Energy Transmission Grating (HETG) spectra of the stellar-mass black hole GRO J1655-40 during its 2005 outburst, revealing a rich and complex disk wind. S…
Venturing beyond the ISCO: Detecting X-ray emission from the plunging regions around black holes
D. R. Wilkins, C. S. Reynolds, A. C. Fabian
We explore how X-ray reverberation around black holes may reveal the presence of the innermost stable circular orbit (ISCO), predicted by General Relativity, and probe the dynamics…
Evidence for Disk Truncation at Low Accretion States of the Black Hole Binary MAXI J1820+070 Observed by NuSTAR and XMM-Newton
Yanjun Xu, Fiona A. Harrison, John A. Tomsick +3
We present results from NuSTAR and XMM-Newton observations of the new black hole X-ray binary MAXI J1820+070 at low accretion rates (below 1% of the Eddington luminosity). We detec…
The Soft State of the Black Hole Transient Source MAXI J1820+070: Emission from the Edge of the Plunge Region?
A. C. Fabian, D. J Buisson, P. Kosec +18
The Galactic black hole X-ray binary MAXI J1820+070 had a bright outburst in 2018 when it became the second brightest X-ray source in the Sky. It was too bright for X-ray CCD instr…
Blueshifted absorption lines from X-ray reflection in IRAS 13224-3809
A. C. Fabian, C. S. Reynolds, J. Jiang +17
We explore a disc origin for the highly-blueshifted, variable absorption lines seen in the X-ray spectrum of the Narrow Line Seyfert 1 galaxy IRAS13224-3809. The blueshift correspo…
A dynamic black hole corona in an active galaxy through X-ray reverberation mapping
William N. Alston, Andrew C. Fabian, Erin Kara +18
X-ray reverberation echoes are assumed to be produced in the strongly distorted spacetime around accreting supermassive black holes. This signal allows us to spatially map the geom…