Now showing items 1-20 of 69

• A 78 Day X-Ray Period Detected from NGC 5907 ULX1 by $\textit{Swift}$ ﻿

(IOP Publishing, 2016-08-10)
We report the detection of a 78.1 ± 0.5 day period in the X-ray light curve of the extreme ultraluminous X-ray source NGC 5907 ULX1 (L$_\text{X,peak}$ ~ 5 × 10$^{40}$ erg s$^{-1}$), discovered during an extensive monitoring ...
• THE ACCRETION DISK WIND IN THE BLACK HOLE GRS 1915+105 ﻿

(2016-04-10)
• AGN-starburst evolutionary connection: a physical interpretation based on radiative feedback ﻿

(Oxford University Press, 2016-12-01)
Observations point towards a close connection between nuclear starbursts, active galactic nuclei (AGN), and outflow phenomena. An evolutionary sequence, starting from a dust-obscured ultra-luminous infrared galaxy and ...
• Alma Observations of Massive Molecular Gas Filaments Encasing Radio Bubbles in the Phoenix Cluster ﻿

(Institute of Physics, 2017-02-14)
We report new ALMA observations of the CO(3-2) line emission from the 2.1 $\pm$ 0.3 x 10$^{10}$ $\textit{M}$$\odot$ molecular gas reservoir in the central galaxy of the Phoenix cluster. The cold molecular gas is fueling a ...
• Applications for edge detection techniques using $\textit{Chandra}$ and $\textit{XMM–Newton}$ data: galaxy clusters and beyond ﻿

(Oxford University Press, 2016-06-10)
The unrivalled spatial resolution of the $\textit{Chandra}$ X-ray observatory has allowed many breakthroughs to be made in high-energy astrophysics. Here we explore applications of Gaussian gradient magnitude (GGM) filtering ...
• Athena Wide Field Imager Key Science Drivers ﻿

(SPIE, 2016-07-11)
The Wide Field Imager (WFI) is one of two instruments for the Advanced Telescope for High-ENergy Astrophysics (Athena). In this paper we summarise three of the many key science objectives for the WFI – the formation and ...

(2017-05)
• Broadband Observations of High Redshift Blazars ﻿

(IOP, 2016-07-01)
We present a multi-wavelength study of four high redshift blazars, S5 0014+81 (z = 3.37), CGRaBS J0225+1846 (z = 2.69), BZQ J1430+4205 (z = 4.72), and 3FGL J1656.2−3303 (z = 2.40) using quasi-simultaneous data from the ...
• The Broadband Spectral Variability of Holmberg IX X-1 ﻿

(Institute of Physics, 2017-04-21)
We present results from four new broadband X-ray observations of the extreme ultraluminous X-ray source Holmberg IX X-1 (L$_{x}$ > 10$^{40}$ erg s$^{-1}$), performed by $\textit{Suzaku}$ and $\textit{Nu}$STAR in coordination. ...
• Close entrainment of massive molecular gas flows by radio bubbles in the central galaxy of Abell 1795 ﻿

(Oxford Univeristy Press, 2017-09-07)
We present new ALMA observations tracing the morphology and velocity structure of the molecular gas in the central galaxy of the cluster Abell 1795. The molecular gas lies in two filaments that extend 5—7 kpc to the N and ...
• The close environments of accreting massive black holes are shaped by radiative feedback ﻿

(Springer Nature, 2017-09-28)
The majority of the accreting supermassive black holes in the Universe are obscured by large columns of gas and dust1,2,3. The location and evolution of this obscuring material have been the subject of intense research in ...
• Constraining the mass of accreting black holes in ultraluminous X-ray sources with ultrafast outflows ﻿

(Oxford University Press, 2017-07-21)
The nature of ultraluminous X-ray sources (ULXs) – off-nuclear extragalactic sources with luminosity, assumed isotropic, ≳1039 erg s−1 – is still debated. One possibility is that ULXs are stellar black holes (BHs) accreting ...

(2015-11-20)

(2017-08)
• Detecting edges in the X-ray surface brightness of galaxy clusters ﻿

(Oxford University Press, 2016-08-01)
The effects of many physical processes in the intracluster medium of galaxy clusters imprint themselves in X-ray surface brightness images. It is therefore important to choose optimal methods for extracting information ...
• The detection and X-ray view of the changing look AGN HE 1136-2304 ﻿

(Oxford University Press, 2016-09-11)
We report the detection of high-amplitude X-ray flaring of the AGN HE 1136-2304, which is accompanied by a strong increase in the flux of the broad Balmer lines, changing its Seyfert type from almost type 2 in 1993 down ...
• Disc reflection and a possible disc wind during a soft X-ray state in the neutron star low-mass X-ray binary 1RXS J180408.9-342058 ﻿

(Oxford University Press, 2016-10-01)
1RXS J180408.9–342058 is a transient neutron star low-mass X-ray binary that exhibited a bright accretion outburst in 2015. We present $\textit{NuSTAR}$, $\textit{Swift}$, and $\textit{Chandra}$ observations obtained around ...
• Discovery of coherent pulsations from the Ultraluminous X-ray Source NGC 7793 P13 ﻿

(Institute of Physics Publishing, 2016-11-10)
We report the detection of coherent pulsations from the ultraluminous X-ray source (ULX) NGC 7793 P13. The ≈0.42 s nearly sinusoidal pulsations were initially discovered in broadband X-ray observations using XMM-Newton and ...
• DISK–WIND CONNECTION DURING THE HEARTBEATS OF GRS 1915+105 ﻿

(IOP Publishing, 2016-12-20)
Disk and wind signatures are seen in the soft state of Galactic black holes, while the jet is seen in the hard state. Here we study the disk–wind connection in the ρ class of variability in GRS 1915+105 using a joint ...
• The distribution of dark and luminous matter in the unique galaxy cluster merger Abell 2146 ﻿

(Oxford University Press, 2016-06-11)
Abell 2146 ($z$ = 0.232) consists of two galaxy clusters undergoing a major merger. The system was discovered in previous work, where two large shock fronts were detected using the $\textit{Chandra X-ray Observatory}$, ...